CN117229013A - Excavation silt solidified soil, preparation method and application - Google Patents
Excavation silt solidified soil, preparation method and application Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 352
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 238000009412 basement excavation Methods 0.000 title description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 196
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 189
- 239000000463 material Substances 0.000 claims abstract description 137
- 239000000203 mixture Substances 0.000 claims abstract description 59
- 239000004927 clay Substances 0.000 claims abstract description 28
- 238000005056 compaction Methods 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims description 24
- 239000004568 cement Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 13
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 13
- 239000004571 lime Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 12
- 239000011575 calcium Substances 0.000 claims description 12
- 229910052791 calcium Inorganic materials 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 12
- 238000010348 incorporation Methods 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 9
- 238000007873 sieving Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000002671 adjuvant Substances 0.000 claims description 2
- 239000004566 building material Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims 2
- 239000000440 bentonite Substances 0.000 claims 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims 2
- 239000002245 particle Substances 0.000 abstract description 60
- 230000000694 effects Effects 0.000 abstract description 14
- 238000009826 distribution Methods 0.000 abstract description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000292 calcium oxide Substances 0.000 abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 11
- 239000008239 natural water Substances 0.000 description 10
- 239000004576 sand Substances 0.000 description 10
- -1 hydrogen ions Chemical class 0.000 description 8
- 239000008202 granule composition Substances 0.000 description 6
- 239000003469 silicate cement Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000004480 active ingredient Substances 0.000 description 4
- 238000005341 cation exchange Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical group [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Processing Of Solid Wastes (AREA)
Abstract
The application relates to the technical field of road engineering materials, and provides excavated silt solidified soil, a preparation method and application thereof, wherein the silt comprises sandy and sticky silt, and the silt solidified soil comprises the following components in percentage by mass: 50-76% of silt, 4-10% of soil body curing agent, 20-40% of auxiliary material soil and water, wherein the silt curing soil is formed by mixing and rolling the silt, the soil body curing agent, the auxiliary material soil and the water. The water is added to enable the water content of the solidified soil mixture system to be 2% greater than the optimal water content, so that mechanical compaction is facilitated. The clay particles in the excavated silt are supplemented by the auxiliary material soil, the particle size distribution of the soil is optimized, the curing agent function is better exerted, the purposes of reducing the curing agent content and improving the curing soil performance are achieved, the particle size of the particles is updated by the auxiliary material soil, and the particle size distribution of the mixture system can be changed. In addition, the clay particles are mainly secondary minerals with relatively active properties, and can exert the effects of the ionic curing agent and the calcium oxide.
Description
Technical Field
The application relates to the technical field of road engineering materials, in particular to excavated silt solidified soil, a preparation method and application.
Background
Along with the gradual acceleration of the urban process in China, the engineering slag soil represented by foundation pit excavation presents a rapid increasing trend, and a series of problems such as resource waste, environmental pollution and the like are caused. At present, engineering muck is an effectively utilized resource which has become social consensus, and proper disposal and recycling of muck have become important problems unavoidable in the development of the economic society of China.
The silt is a transition soil between cohesive soil and sandy soil, the main body of the silt is powder particles, and the particle diameter is between 0.005 and 0.075 mm. The powder soil has loose integral structure, low strength and obvious capillary phenomenon, is soil with poor properties, and can be applied to roads and other filling engineering seeds only by being improved and solidified.
The curing agents which are commonly used at present are mainly inorganic compounds such as cement, lime, fly ash and high polymers such as asphalt, polymers and ions. The common cement and lime curing agents have been widely used in many projects. However, the conventional curing agents have strong selectivity and pertinence to soil, and the curing agents have poor curing effect on silt, or even sometimes have no curing effect at all. Therefore, it is important for those skilled in the art to develop new silt solidified soil for sandy and cohesive silt of foundation pit excavation.
Disclosure of Invention
In order to achieve the above object, the present application provides the following technical solutions:
the application provides excavation silt solidified soil, which comprises sandy and sticky silt, wherein the silt solidified soil comprises the following components in percentage by mass: 50-76% of silt, 4-10% of soil body curing agent, 20-40% of auxiliary material soil and water, wherein the silt curing soil is formed by mixing and rolling the silt, the soil body curing agent, the auxiliary material soil and the water. The water is added to enable the water content of the solidified soil mixture system to be 2% greater than the optimal water content, so that mechanical compaction is facilitated.
Furthermore, the auxiliary material soil comprises one or more of silt, silt clay and clay, the clay particle content in the soil material is supplemented through the auxiliary material soil, the grading of the soil material particles is optimized, the curing agent function is better exerted, and the aims of reducing the curing agent content and improving the curing soil performance are fulfilled. The particle size of the mixture system can be changed by renewing the particle size of the auxiliary material soil. In addition, the clay particles are mainly secondary minerals with relatively active properties, and can exert the effects of the ionic curing agent and the calcium oxide.
Further, the soil body curing agent is a composite curing agent consisting of a calcium-based curing agent and an ionic curing agent.
Further, the calcium-based curing agent comprises one or more of cement and lime. The calcium-based curing agent mainly utilizes calcium ion exchange and pozzolan reaction and calcium hydroxide crystallization and carbonization to enhance the soil stabilization effect, and has a good effect on non-special soil curing. The cement is often used for curing gravel soil and sand with larger particle size and small plasticity index, and the silt and clay often need larger dosage of cement, and the curing effect is poor. Lime is generally used to stabilize clay and acid soil, nor is it suitable for use as silt.
Furthermore, the ionic curing agent is a non-acidic ionic curing agent, the ionic curing agent is a liquid water-soluble product, the main active component is sulfonated oil, and a large amount of hydrogen ions and hydroxyl ions are formed by ionization of the ionic curing agent after water is added, so that the ionic curing agent reacts with soil particles to reduce the binding water film of the soil particles; the sulfonated oil hydrophilic group in the ionic curing agent and soil particles are subjected to cation exchange, so that active ingredients are connected with the soil particles, the other end of the ionic curing agent is lipophilic to the outside, the soil particles are changed from hydrophilic to hydrophobic, further drainage and soil solidification are realized, and the problem that a single curing agent is difficult to play a reinforcing effect on sandy and cohesive silty soil is solved.
Further, the water is added according to the following mass: according to the optimal water content of the mixture system obtained by the compaction test, the adding mass of the water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
The application provides a preparation method of excavated silt solidified soil, which is used for preparing the silt solidified soil and comprises the following steps:
(1) Sieving the excavated silt and auxiliary material soil, removing sundries such as construction waste in the excavated residue soil, stewing materials, and tedding
(2) The method comprises the steps of weighing excavated silt, auxiliary material soil and curing agent according to a proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test;
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring;
(4) And (3) filling the mixture obtained in the step (3) into a mould, compacting, keeping the compactness to be not less than 93%, performing moisture maintenance for 6d at 20+/-2 ℃ after demoulding, and soaking for 1d.
Further, the powder soil, auxiliary material soil and soil body curing agent comprises the following components in percentage by mass: 50-76% of silt, 20-40% of auxiliary material soil and 4-10% of soil body curing agent.
Further, the amount of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the mass of water in the silt，m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
The application provides an application of excavated silt solidified soil, which is used as filling materials for urban road municipal trench backfill, road bed filling, road bed replacement filling and road base, and as building materials for base and subbase.
The application has the following beneficial effects:
(1) According to the application, auxiliary material soil with high sticky particle content is mixed, and a composite curing agent is adopted, so that the calcium-based curing agent mainly utilizes calcium ion exchange, volcanic ash reaction and crystallization and carbonization of calcium hydroxide to enhance the stabilizing effect of the soil, and has a good effect on curing non-special soil; the ionic curing agent is a liquid water-soluble product, the main active component is sulfonated oil, and a large amount of hydrogen ions and hydroxyl ions are formed by ionization of the ionic curing agent after water is added, so that the ionic curing agent reacts with soil particles to reduce the binding water film of the soil particles; the sulfonated oil hydrophilic group in the ionic curing agent and soil particles are subjected to cation exchange, so that active ingredients are connected with the soil particles, and the other end of the sulfonated oil hydrophilic group is lipophilic to the outside, so that the soil particles are changed from hydrophilic to hydrophobic, further drainage is realized, the cost of curing soil is reduced, and the performance of curing soil is improved;
(2) According to the application, the auxiliary material soil is doped, the clay particle content in the excavated silt is supplemented by the auxiliary material soil, the particle size distribution of the soil is optimized, the curing agent function is better exerted, the aims of reducing the curing agent content and improving the curing soil performance are fulfilled, the particle size of the particles is updated by the auxiliary material soil, and the particle size distribution of a mixture system can be changed. In addition, the clay particles are mainly secondary minerals with relatively active properties, and can exert the effects of the ionic curing agent and the calcium oxide.
(3) The silt solidified soil prepared by the method disclosed by the application is high in early strength, high in permeability resistance and good in water stability, has a plurality of application scenes in road engineering, provides powerful technical support for recycling the silt, widens a residue disposal means and can also reduce the exploitation of sand and stone resources.
Detailed Description
The following detailed description of the present application is provided in connection with the examples, and it should be noted that the examples are merely illustrative of the application and should not be construed as limiting the application, but are intended to provide those skilled in the art with a better understanding and reproduction of the technical solution of the application, the scope of which is still defined by the claims.
The application provides excavation silt solidified soil, which comprises sandy and sticky silt, wherein the silt solidified soil comprises the following components in percentage by mass: 50-76% of silt, 4-10% of soil body curing agent, 20-40% of auxiliary material soil and water, wherein the silt curing soil is formed by mixing and rolling the silt, the soil body curing agent, the auxiliary material soil and the water. The water is added to enable the water content of the solidified soil mixture system to be 2% greater than the optimal water content, so that mechanical compaction is facilitated. The auxiliary material soil comprises silt, silt clay and clay or a mixture of more than one of the silt, the silt clay and the clay. The soil body curing agent is a composite curing agent consisting of a calcium-based curing agent and an ionic curing agent.
The calcium-based curing agent comprises one or more of cement and lime. The calcium-based curing agent mainly utilizes calcium ion exchange and pozzolan reaction and calcium hydroxide crystallization and carbonization to enhance the soil stabilization effect, and has a good effect on non-special soil curing. The cement is often used for curing gravel soil and sand with larger particle size and small plasticity index, and the silt and clay often need larger dosage of cement, and the curing effect is poor. Lime is generally used to stabilize clay and acid soil, nor is it suitable for use as silt. The ionic curing agent is a non-acidic ionic curing agent, the ionic curing agent is a liquid water-soluble product, the main active component is sulfonated oil, and a large amount of hydrogen ions and hydroxyl ions are formed by ionization of the ionic curing agent after water is added, so that the ionic curing agent reacts with soil particles to reduce the binding water film of the soil particles; the sulfonated oil hydrophilic group in the ionic curing agent and soil particles are subjected to cation exchange, so that active ingredients are connected with the soil particles, the other end of the ionic curing agent is lipophilic to the outside, the soil particles are changed from hydrophilic to hydrophobic, further drainage and soil solidification are realized, and the problem that a single curing agent is difficult to play a reinforcing effect on sandy and cohesive silty soil is solved.
In some preferred schemes, the optimal water content of the mixture system is obtained according to a compaction test, and the water is added according to the following mass: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
The application provides a preparation method of excavated silt solidified soil, which is used for preparing the silt solidified soil and comprises the following steps:
(1) Sieving the excavated silt and the auxiliary material soil, removing sundries such as construction waste in the excavated residue soil, stewing materials, and tedding;
(2) The method comprises the steps of weighing excavated silt, auxiliary material soil and curing agent according to a proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test; the powder soil, auxiliary material soil and soil body curing agent comprises the following components in percentage by mass: 50-76% of silt, 20-40% of auxiliary material soil and 4-10% of soil body curing agent.
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring; the dosage of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the quality of water in the siltQuantity, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
(4) And (3) filling the mixture obtained in the step (3) into a mould, compacting, keeping the compactness to be not less than 93%, performing moisture maintenance for 6d at 20+/-2 ℃ after demoulding, and soaking for 1d.
Example 1
The embodiment provides an excavation silt soil solidification soil, which is prepared by the following steps:
(1) Sieving the excavated silt and the auxiliary material soil, removing sundries such as construction waste in the excavated residue soil, stewing materials, and tedding;
(2) The method comprises the steps of weighing excavated silt, auxiliary material soil and curing agent in proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test, wherein the optimal water content is 17.1%; the powder soil, auxiliary material soil and soil body curing agent comprises the following components in percentage by mass: and (3) cement: lime: excavating silt: clay = 4:3:53:40, the mixing amount of the ionic curing agent is 0.6L/m 3 . Wherein the natural water content of the sandy silt is 28%, the liquid limit is 29.9%, the plastic limit is 20.8%, and the plastic index is 9.1; the granule composition comprises 8.7% of sticky particles, 85.8% of powder particles and 5.5% of fine sand.
The natural water content of clay is 37.5%, the liquid limit is 39.5%, the plastic limit is 22.1% and the plastic index is 17.4.
The cement is P.O 42.5.42.5 ordinary silicate cement.
The ionic curing is carried out by selecting a strong commercial liquid water-soluble ionic curing agent.
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring; the dosage of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For doping solidifying agent dry mass, omega is powder soil, soil solidifying agent and auxiliaryOptimal water content of material-soil mixture, m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
(4) Rolling the mixture obtained in the step (3) according to a preset dry density by using a static compaction method to prepare a sample, wherein the compaction degree is not less than 93%; the sample was maintained under moisture at 20.+ -. 2 ℃ for 6d and immersed in water for 1d.
Example 2
The embodiment provides an excavation silt soil solidification soil, which is prepared by the following steps:
(1) Sieving the excavated silt and the auxiliary material soil, removing sundries such as construction waste in the excavated residue soil, stewing materials, and tedding;
(2) The method comprises the steps of weighing excavated silt, auxiliary material soil and curing agent in proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test, wherein the optimal water content is 16.1%; the powder soil, auxiliary material soil and soil body curing agent comprises the following components in percentage by mass: and (3) cement: lime: excavating silt: clay = 3:3:74:20, the mixing amount of the ionic curing agent is 0.6L/m 3 . Wherein the natural water content of the sandy silt is 28%, the liquid limit is 29.9%, the plastic limit is 20.8%, and the plastic index is 9.1; the granule composition comprises 8.7% of sticky particles, 85.8% of powder particles and 5.5% of fine sand.
The natural water content of clay is 37.5%, the liquid limit is 39.5%, the plastic limit is 22.1% and the plastic index is 17.4.
The cement is P.O 42.5.42.5 ordinary silicate cement.
The ionic curing is carried out by selecting a strong commercial liquid water-soluble ionic curing agent.
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring; the dosage of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is auxiliary materialDry mass of soil, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
(4) Rolling the mixture obtained in the step (3) according to a preset dry density by using a static compaction method to prepare a sample, wherein the compaction degree is not less than 93%; the sample was maintained under moisture at 20.+ -. 2 ℃ for 6d and immersed in water for 1d.
Example 3
The embodiment provides an excavation silt soil solidification soil, which is prepared by the following steps:
(1) Sieving the excavated silt and the auxiliary material soil, removing sundries such as construction waste in the excavated residue soil, stewing materials, and tedding;
(2) The method comprises the steps of weighing excavated silt, auxiliary material soil and curing agent in proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test, wherein the optimal water content is 16.1%; the powder soil, auxiliary material soil and soil body curing agent comprises the following components in percentage by mass: and (3) cement: lime: excavating silt: clay = 3:3:74:20, the mixing amount of the ionic curing agent is 0.3L/m 3 . Wherein the natural water content of the sandy silt is 28%, the liquid limit is 29.9%, the plastic limit is 20.8%, and the plastic index is 9.1; the granule composition comprises 8.7% of sticky particles, 85.8% of powder particles and 5.5% of fine sand.
The natural water content of clay is 37.5%, the liquid limit is 39.5%, the plastic limit is 22.1% and the plastic index is 17.4.
The cement is P.O 42.5.42.5 ordinary silicate cement.
The ionic curing is carried out by selecting a strong commercial liquid water-soluble ionic curing agent.
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring; the dosage of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
(4) Rolling the mixture obtained in the step (3) according to a preset dry density by using a static compaction method to prepare a sample, wherein the compaction degree is not less than 93%; the sample was maintained under moisture at 20.+ -. 2 ℃ for 6d and immersed in water for 1d.
Comparative example 1 (without adding adjuvant soil)
The comparative example provides an excavation silt solidified soil, which is prepared by the following steps:
(1) Sieving the excavated silt to remove construction waste and other impurities in the excavated silt, stewing, and tedding
(2) The method comprises the steps of weighing excavated silt and a curing agent according to a proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test, wherein the optimal water content is 16.2%; the silt and soil body curing agent comprises the following components in percentage by mass: and (3) cement: lime: excavation silt=4: 3:93, the mixing amount of the ionic curing agent is 0.6L/m 3 . Wherein the natural water content of the sandy silt is 28%, the liquid limit is 29.9%, the plastic limit is 20.8%, and the plastic index is 9.1; the granule composition comprises 8.7% of sticky particles, 85.8% of powder particles and 5.5% of fine sand.
The cement is P.O 42.5.42.5 ordinary silicate cement.
The ionic curing is carried out by selecting a strong commercial liquid water-soluble ionic curing agent.
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring; the dosage of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil ++m Curing agent )×(ω+2％)-(m Silt water ++m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Curing agent Is doped withAdding curing agent into the mixture, wherein omega is the optimal water content of the mixture of the powder soil and the soil curing agent, and m Silt soil Is the mass of water in the silt, m Curing agent For incorporation into the curing agent.
(4) Rolling the mixture obtained in the step (3) according to a preset dry density by using a static compaction method to prepare a sample, wherein the compaction degree is not less than 93%; the sample was maintained under moisture at 20.+ -. 2 ℃ for 6d and immersed in water for 1d.
Comparative example 2 (no addition of an ionic curative)
The comparative example provides an excavation silt solidified soil, which is prepared by the following steps:
(1) Sieving the excavated silt and the auxiliary material soil, removing sundries such as construction waste in the excavated residue soil, stewing materials, and tedding;
(2) The method comprises the steps of weighing excavated silt, auxiliary material soil and a calcium-based curing agent according to a proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test, wherein the optimal water content is 16.6%; the silt, auxiliary material soil and calcium-based curing agent comprise the following components in percentage by mass: and (3) cement: lime: excavating silt: clay = 4:3:53:40. wherein the natural water content of the sandy silt is 28%, the liquid limit is 29.9%, the plastic limit is 20.8%, and the plastic index is 9.1; the granule composition comprises 8.7% of sticky particles, 85.8% of powder particles and 5.5% of fine sand.
The natural water content of clay is 37.5%, the liquid limit is 39.5%, the plastic limit is 22.1% and the plastic index is 17.4.
The cement is P.O 42.5.42.5 ordinary silicate cement.
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring; the dosage of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing with solidifying agent, omega is the mixture of powdered soil, solidifying agent of soil body and auxiliary material soilOptimal water content, m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
(4) Rolling the mixture obtained in the step (3) according to a preset dry density by using a static compaction method to prepare a sample, wherein the compaction degree is not less than 93%; the sample was maintained under moisture at 20.+ -. 2 ℃ for 6d and immersed in water for 1d.
Comparative example 3 (no auxiliary soil and soil curing agent were added and only inorganic composite curing agent was used)
The comparative example provides an excavation silt solidified soil, which is prepared by the following steps:
(1) Sieving the excavated silt to remove sundries such as construction waste in the excavated dregs, stewing materials, and tedding;
(2) The method comprises the steps of weighing excavated silt and an inorganic composite curing agent in proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test, wherein the optimal water content is 16%; the silt and inorganic composite curing agent comprises the following components in percentage by mass: and (3) cement: lime: polyaluminum chloride: polymeric ferric chloride: active magnesium oxide: excavation silt=3: 2.5:0.15:0.2:0.15:94. wherein the natural water content of the sandy silt is 28%, the liquid limit is 29.9%, the plastic limit is 20.8%, and the plastic index is 9.1; the granule composition comprises 8.7% of sticky particles, 85.8% of powder particles and 5.5% of fine sand.
The cement is P.O 42.5.42.5 ordinary silicate cement.
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring; the dosage of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is water in the siltMass, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
(4) Rolling the mixture obtained in the step (3) according to a preset dry density by using a static compaction method to prepare a sample, wherein the compaction degree is not less than 93%; the sample was maintained under moisture at 20.+ -. 2 ℃ for 6d and immersed in water for 1d.
The solidified soil prepared in example 1, example 2, example 3, comparative example 1 and comparative example 2 was subjected to seven-day unconfined compressive test, and the test results are shown in table 1.
TABLE 1
As is clear from Table 1, the standard values of the unconfined compressive strength of the solidified soil prepared in example 1, example 2 and example 3 are respectively 1.6MPa, 1.3MPa and 1.2MPa in seven days, and all the standard values of the unconfined compressive strength meet the road performance requirements,
compared with the comparative example 1, the example 1 shows that under the condition that the auxiliary material soil is not added, the prepared solidified soil has the standard value of unconfined compressive strength in seven days far lower than that of the auxiliary material soil, the auxiliary material soil can supplement the content of clay particles in the excavated silt soil, the particle size distribution of the soil materials is optimized, the effect of the solidifying agent is better exerted, the aims of reducing the content of the solidifying agent and improving the performance of the solidified soil are fulfilled, and the particle size of the particles is updated by the auxiliary material soil, so that the particle size distribution of a mixture system can be changed; in addition, the clay particles are mainly secondary minerals with relatively active properties, and can exert the effects of the ionic curing agent and the calcium oxide.
As can be seen from comparison of example 1 and comparative example 2, under the condition of no addition of the ionic curing agent, the standard value of the unconfined compressive strength of the prepared cured soil in seven days is slightly lower than that of the cured soil added with the ionic curing agent, and the ionic curing agent is ionized to form a large amount of hydrogen ions and hydroxyl ions after being added with water, so that the water film combined with soil particles is reduced by the reaction of the curing soil particles; the sulfonated oil hydrophilic group in the ionic curing agent and soil particles are subjected to cation exchange, so that active ingredients are connected with the soil particles, and the other end of the sulfonated oil hydrophilic group is lipophilic to the outside, so that the soil particles are changed from hydrophilic to hydrophobic, and further drainage and soil body curing are realized.
As can be seen from comparison of example 1 and comparative example 3, the solidified soil prepared by adding the auxiliary material soil and the composite curing agent consisting of the calcium-based curing agent and the ionic curing agent is superior to the solidified soil prepared by only using the inorganic composite curing agent in the prior art in the aspect of measuring the standard value of the seven-day unconfined compressive strength, and the compressive strength of the solidified soil prepared by the application is higher.
In summary, by means of the technical scheme, the compressive strength is high by adopting a reasonable curing agent formula; the silt solidified soil is fast-hardening, high in strength, high in permeability resistance and good in water stability, can be widely used in the fields of urban road municipal groove backfill, road bed filling, road bed replacement and filling, road base layer filling, base layer and base layer building and the like in road engineering, provides powerful technical support for the recycling of silt, widens the residue disposal means and can reduce the exploitation of sand and stone resources.
It should be noted that technical features not described in detail in the present application may be implemented by any prior art.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
Claims (10)
1. An excavated silt solidified soil, wherein the silt comprises sandy and cohesive silt, and the silt solidified soil comprises the following components in percentage by mass: 50-76% of silt, 4-10% of soil body curing agent, 20-40% of auxiliary material soil and water, wherein the silt curing soil is formed by mixing and rolling the silt, the soil body curing agent, the auxiliary material soil and the water.
2. An excavated silt cured soil according to claim 1 wherein the adjuvant soil comprises one or more of silt, silt clay, clay.
3. The excavated silt cured soil according to claim 1, wherein the soil body curing agent is a composite curing agent composed of a calcium-based curing agent and an ionic curing agent.
4. An excavated silt cured soil according to claim 3, wherein the calcium-based curing agent comprises one or more of cement, lime.
5. An excavated silt cured soil according to claim 3, wherein the ionic curing agent is a non-acidic ionic curing agent.
6. The excavated silt cured soil according to claim 1, wherein the water is added in the following mass: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
7. A method for preparing excavated silt cured soil, characterized in that the preparation method is used for preparing the silt cured soil according to any one of claims 1 to 6, the preparation method comprising:
(1) Sieving the excavated silt and the auxiliary material soil, removing sundries such as construction waste in the excavated residue soil, stewing materials, and tedding;
(2) The method comprises the steps of weighing excavated silt, auxiliary material soil and curing agent according to a proportion to obtain a soil mixture, and determining the optimal water content and the maximum dry density of the soil mixture through a compaction test;
(3) Calculating the amount of water to be added according to the optimal water content of the soil mixture, and adding the calculated amount of water into the soil mixture and uniformly stirring;
(4) And (3) filling the mixture obtained in the step (3) into a mould, compacting, keeping the compactness to be not less than 93%, performing moisture maintenance for 6d at 20+/-2 ℃ after demoulding, and soaking for 1d.
8. The preparation method of the excavated silt solidified soil is characterized in that the silt, the auxiliary material soil and the soil solidifying agent are prepared by the following components in percentage by mass: 50-76% of silt, 20-40% of auxiliary material soil and 4-10% of soil body curing agent.
9. The method for preparing the excavated silt solidified soil according to claim 7, wherein the amount of the added water is as follows: m is m Water and its preparation method ＝(m Silt soil +m Auxiliary material soil +m Curing agent )×(ω+2％)-(m Silt water +m Auxiliary material soil and water +m Curing agent water ) Wherein m is Water and its preparation method For the addition mass of water, m Silt soil Dry mass of silt, m Auxiliary material soil Is the dry mass of the auxiliary materials, m Curing agent For mixing the dry mass of the curing agent, omega is the optimal water content of the powder soil, the soil curing agent and the auxiliary material soil, and m Silt soil Is the mass of water in the silt, m Auxiliary material soil Is the mass of water in auxiliary material soil, m Curing agent For incorporation into the curing agent.
10. The use of the cured bentonite of excavated silt, characterized in that the cured bentonite of silt prepared by the method of any one of claims 7 to 9 is used as filling material for municipal trench backfill, road bed filling, road bed changing and road base and as building material for base and subbase.
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