CN113006091B - Method for recycling engineering waste soil through backfilling - Google Patents
Method for recycling engineering waste soil through backfilling Download PDFInfo
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- CN113006091B CN113006091B CN202110242932.7A CN202110242932A CN113006091B CN 113006091 B CN113006091 B CN 113006091B CN 202110242932 A CN202110242932 A CN 202110242932A CN 113006091 B CN113006091 B CN 113006091B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
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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
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for recycling engineering spoil backfill, which belongs to the technical field of engineering spoil treatment and comprises the following steps: 1) preparing backfill materials and a compacting machine; 2) leveling the field; 3) compacting the field; 4) backfilling and compacting in layers; 5) and detecting various properties of the backfill soil layer. The invention effectively solves the problems of treating the pollution and recycling of the engineering waste soil by using the engineering waste soil as the backfill material, simultaneously adopts a mode of controlling the process quality by backfilling and rolling in a layering way, increases solid particles in the unit volume of the soil body, reduces the porosity, eliminates the nonuniformity of foundation soil and reduces the residual settlement, improves the safety, shortens the construction period, avoids the capital investment caused by secondary treatment needed in the later stage of one-time filling, and has better economic benefit and social benefit.
Description
Technical Field
The invention belongs to the technical field of engineering waste soil treatment, and particularly relates to a method for backfilling and recycling engineering waste soil.
Background
The waste soil is a component of construction waste and mainly comes from real estate construction projects, underground pipe gallery projects, subway projects and the like. With the acceleration of the pace of urban construction in China, the production and discharge amount of engineering waste soil are rapidly increased. In the waste soil treatment process, the construction unit stacks the waste soil everywhere in order to reduce the treatment cost, so that not only can a large amount of land be occupied, but also the silting of a river channel can be caused, the environment is polluted, and the water quality is influenced.
At present, the national advocates that the principle of 'reduction, reutilization and resource utilization' is adopted, the core is 'resource saving and cyclic utilization', the basic characteristics of 'low consumption, low emission and high efficiency' are adopted, and the waste treatment sequence is as follows: avoiding or reducing, recycling, harmless treatment, resource utilization and reutilization. In this regard, research on recycling of spoil is a positive response to national initiatives. However, most of the treatment of the engineering waste soil at the present stage is a landfill waste soil field, the application of the waste soil as a building foundation for reinforcement is less, and the construction cost is high due to the adoption of the treatment modes such as dynamic compaction, dynamic compaction replacement, preloading and the like at the later stage of a large-area backfill foundation.
Disclosure of Invention
In view of the above, the invention provides a method for backfilling and recycling engineering waste soil, which uses the engineering waste soil as backfill material to solve the problems of land occupation and pollution caused by the accumulation of the engineering waste soil, and adopts a mode of controlling the backfilling and the layered rolling at the same time to increase the number of solid particles in a unit volume of a soil body, reduce the porosity, eliminate the non-uniformity of foundation soil, reduce residual settlement and improve the safety.
The invention is realized by the following technical scheme:
a method for backfilling and recycling engineering waste soil comprises the following steps:
s1: preparing backfill materials and a compaction machine: selecting backfill meeting backfill requirements and selecting a proper compacting machine according to the actual condition of the backfill;
s2: leveling the field: dividing an operation area, filling by areas and construction sections, removing garbage, sludge and other impurities on the surface of the foundation pit, and keeping the foundation pit smooth and clean;
s3: and (3) field compaction: rolling and compacting the original soil of the substrate by adopting a compacting machine to ensure that the compaction coefficient of the original soil reaches 0.93, checking the depth and the horizontal elevation of the foundation pit, and paving a thickness mark;
s4: backfilling and compacting by layers: backfilling backfill and medium coarse sand in a staggered and layered mode, dividing a foundation pit into horizontal layers from low to high, filling and rolling the horizontal layers layer by layer, detecting whether the compaction degree coefficient and the bearing capacity of each layer of backfill meet the design requirements or not after each layer of backfill is paved and compacted, and performing next layer construction after the design requirements are met, or performing re-rolling;
s5: and detecting the compaction coefficient, the water content, the compression modulus and the bearing capacity characteristic value of the whole backfill soil.
Compared with the prior art, the method adopts the engineering waste soil as the backfill material, the compaction coefficient of the obtained backfill soil layer is more than 0.93, and the bearing capacity characteristic value can reach 240KPa, so that the construction requirement can be well met, the problems of pollution and recycling of the engineering waste soil are effectively solved, and meanwhile, a layered backfilling and layered rolling control mode is adopted, so that the quantity of solid particles in the unit volume of the soil body is increased, the porosity is reduced, the compactness is increased, the nonuniformity of the foundation soil is eliminated, the residual settlement is reduced, the safety is improved, the construction period is shortened, and the capital investment caused by secondary treatment needed in the later period of one-time filling is avoided.
Further, in step S4, each layer of backfill is performed in a sequence of backfilling from the edge to the middle, backfilling from the two ends to the middle, backfilling the lowest point of each layer first, then backfilling the highest point, and flattening by using a bulldozer.
Further, in step S4, when each layer of backfill is backfilled, the gaps are filled by leveling with fine stones and stone chips at the individual uneven places. In some uneven places, fine stones and stone chips are manually paved and filled, gaps are filled, the surface is flat, and subsequent compaction is facilitated.
Further, the paving thickness of each layer of backfill soil is not more than 50cm, preferably not more than 30 cm.
Furthermore, in step S4, the compacting sequence of slow compacting, fast compacting, edge compacting and middle compacting is performed on each layer of backfill soil, and the tracks of wheel compacting are ensured to be mutually overlapped, so as to prevent pressure leakage.
Further, in step S4, in the region where the compaction machine cannot roll, manual ramming, re-rolling, and layered ramming for compaction are adopted to ensure the compaction quality of the operation region.
Further, in step S4, the compaction degree of each layer of backfill soil is greater than or equal to 0.93, and the bearing capacity is greater than or equal to 120 KPa.
Further, in step S4, a slope of not less than 3% is set during backfilling to facilitate drainage and ensure no accumulated water after rain.
Further, in step S1, the selected backfill soil meets the natural gravity gamma > 16.5KN/m 3 Plasticity index IP<17, the bearing ratio CBR is more than or equal to 3, and the maximum grain diameter of the filler is not more than 200 mm.
Further, in step S1, when the backfill soil is selected, the backfill soil that does not meet the backfill requirements is subjected to the preliminary treatment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following further illustrates the contents of the present invention by examples, and it should be understood that the specific examples described herein are only for explaining the present invention and are not intended to limit the present invention.
The invention provides a method for recycling engineering spoil backfill, which comprises the following steps:
s1: preparing backfill materials and a compaction machine: and detecting the soil quality of the backfill soil to determine that the optimum water content, maximum dry density, particle size, water content and variety meet the backfill requirement. Performing early-stage pretreatment on the backfill soil which does not meet the requirements, such as adding a soil curing agent, loosening the soil, watering the wetted soil and the like; the selection of the compaction machinery is based on the actual situation of the backfill soil, and mainly adopts a light road roller, a 20t vibration road roller, a frog hammer, a forklift, a truck, an excavator, a bulldozer, a steel ruler and the like.
S2: leveling the field: and dividing an operation area, adopting zoning and construction work sections for filling, removing garbage, silt and other impurities on the surface of the foundation pit, keeping the foundation pit smooth and clean, and ensuring that the foundation meets the construction design requirements.
S3, field compaction: adopting a compacting machine to compact the original soil of the substrate, wherein the compaction coefficient of the original soil reaches 0.93, checking the depth and the horizontal elevation of the foundation pit, and paving a thickness mark, such as placing a horizontal standard wood pile or dotting on a side slope; if the original soil of the substrate is wet, a layer of quicklime is paved and then rolled.
S4: layered backfilling and compacting: backfilling soil and medium coarse sand in a staggered layered mode, dividing the backfilled soil and the medium coarse sand into horizontal layers from low to high along a foundation pit, filling the horizontal layers layer by layer upwards, and filling and rolling one layer by layer, wherein the paving and filling thickness of each layer is determined according to the type and the specification of a compaction machine and is not more than 50cm, and generally not more than 30 cm;
in the backfilling process of each layer of soil body, a backfilling sequence of firstly edge and then middle is adopted, backfilling is carried out from two ends to the middle, each layer is backfilled with the lowest point firstly, then is backfilled with the highest point, is spread by a bulldozer, and is leveled by manually using fine stones and stone chips to fill gaps;
after a layer of soil body is backfilled, rolling and compacting the layer of soil body, rolling and compacting the soil body according to the principle that tracks of rolling are overlapped with each other at the positions of slow and fast, edge and middle, and in the embodiment, a vibratory roller with the self weight of 20t is adopted for rolling, each layer of soil body is rolled for 4 times, the length of a rolling operation section is 60-100 m, the speed is gradually accelerated to 4km/h from the initial 2km/h, the overlapping range of main wheels of the roller is not less than 5m at the joint position of two operation sections, and when rolling, the tracks of rolling are overlapped with each other to prevent pressure leakage. In the filled soil area which can not be rolled by the vibratory roller, a frog rammer is manually used for re-rolling, the compaction is carried out in layers, and the compaction quality of the operation area is ensured.
After each layer of backfill soil is paved and compacted, whether the compaction coefficient and the bearing capacity of the backfill soil layer meet the design requirements or not is detected, the embodiment adopts a sand filling method to detect the compaction coefficient of the backfill soil, a flat plate load test is used for detecting the bearing capacity, the rolling layer of which the compaction coefficient does not reach 0.93 or the bearing capacity is lower than 120KPa is re-rolled, and after the re-rolling is finished, the detection of the compaction coefficient and the bearing capacity is performed again until the compaction coefficient and the bearing capacity meet the design requirements, the next layer of construction is performed.
S5: and after the soil body is backfilled in a layered mode and rolled in a layered mode to reach a design elevation, according to building foundation design specifications (GB50007-2011), the compaction coefficient, the water content, the compression modulus and the bearing capacity characteristic value of the soil body at each test point are measured.
Through the backfilling process, the compaction coefficients of soil bodies at all test points are detected to be larger than 0.95, the mean value of the water content is 20.1%, the mean value of the compression modulus is 8.21MPa, and the characteristic value of the bearing capacity can reach 240 kPa.
From the four detection index data, the foundation subjected to layered backfilling and layered rolling meets the design requirements on the compaction coefficient, the water content, the compression modulus and the bearing capacity, and the method for recycling the engineering spoil backfilling provided by the invention is feasible.
In one embodiment, the selected backfill has a physical-mechanical index meeting a natural gravity γ > 16.5KN/m 3 Plasticity index IP<17, the bearing ratio CBR is more than or equal to 3, and the maximum grain size of the filler is not more than 200 mm; in step S1, the backfill soil is selected from gravelly soil with good gradation, soil without pollution, organic soil, silt soil, expansive soil, humus soil, construction waste soil, and the like, preferably from mountain soil.
The invention effectively solves the problems of treating the pollution and recycling of the engineering waste soil by using the engineering waste soil as the backfill material, simultaneously adopts a mode of controlling the process quality by backfilling and rolling in a layering way, increases the quantity of solid particles in the unit volume of the soil body, reduces the porosity, eliminates the nonuniformity of foundation soil and reduces the residual settlement, improves the safety, shortens the construction period, avoids the capital investment caused by secondary treatment needed in the later stage of one-time filling, and has obvious economic benefit and social benefit.
The above description is only a partial example of the present invention, and does not limit the embodiments and the protection scope of the present invention, therefore, it should be recognized that the present invention is covered by the protection scope of the present invention by the equivalent substitution and obvious change made by the description of the present invention for those skilled in the art.
Claims (9)
1. The method for backfilling and recycling the engineering waste soil is characterized by comprising the following steps of:
s1: preparing backfill materials and a compaction machine: selecting backfill meeting backfill requirements and selecting a proper compacting machine according to the actual condition of the backfill, wherein the selected backfill meets the natural severe gamma of more than 16.5KN/m 3 Plasticity index IP<17, the bearing ratio CBR is more than or equal to 3, the maximum grain diameter of the filler is not more than 200mm, and the backfill soil is organic soil, silt soil, expansive soil or humus soil;
s2: leveling the field: dividing an operation area, filling by areas and construction sections, removing garbage, sludge and other impurities on the surface of the foundation pit, and keeping the foundation pit smooth and clean;
s3: and (3) field compaction: rolling and compacting the original soil of the substrate by adopting a compacting machine to ensure that the compaction coefficient of the original soil reaches 0.93, checking the depth and the horizontal elevation of the foundation pit, and paving a thickness mark;
s4: layered backfilling and compacting: backfilling backfill and medium coarse sand in a staggered and layered mode, dividing a foundation pit into horizontal layers from low to high, filling and rolling the horizontal layers layer by layer, detecting whether the compaction degree coefficient and the bearing capacity of each layer of backfill meet the design requirements or not after each layer of backfill is paved and compacted, and performing next layer construction after the design requirements are met, or performing re-rolling;
s5: and detecting the compaction coefficient, the water content, the compression modulus and the bearing capacity characteristic value of the whole backfill soil.
2. The method as claimed in claim 1, wherein in step S4, each layer of backfill is performed in a sequence of backfilling from edge to middle, with the lowest point backfilled and the highest point backfilled.
3. The method of claim 2, wherein in step S4, each layer of backfill is filled with gaps by leveling with fine stones and stone chips.
4. The method for backfilling and recycling of engineering spoil according to claim 3, wherein the paving thickness of each layer of backfill soil is not more than 50 cm.
5. The method for recycling the backfill of the engineering spoil according to the claim 1, wherein in the step S4, the compaction sequence of slow-first, fast-later, edge-first and middle-later is adopted for each layer of the backfill.
6. The method for backfilling and recycling the engineering waste soil according to claim 5, wherein in step S4, the area which can not be compacted by the compacting machine is compacted and re-ground by manual operation.
7. The method for backfilling and recycling the engineering waste soil according to claim 1, wherein in step S4, the compaction degree of each layer of the backfilled soil is greater than or equal to 0.93, and the bearing capacity is greater than or equal to 120 KPa.
8. The method for recycling the backfill of the engineering waste soil according to claim 1, wherein in the step S4, a slope not less than 3% is reserved during the backfill.
9. The method for backfilling and recycling of engineering waste soil according to claim 1, wherein in step S1, when the backfill soil is selected, the backfill soil which does not meet the backfill requirements is subjected to a pre-treatment.
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| CN114319294B (en) * | 2021-12-09 | 2023-07-11 | 国网江苏省电力工程咨询有限公司 | Method for constructing water-lack layer by using poor engineering soil to inhibit plant growth |
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| CN108951333A (en) * | 2018-08-16 | 2018-12-07 | 河南省公路工程局集团有限公司 | A kind of method that building castoff processing recycles |
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