CN115263230A - Double-layer casing pipe for upward and oblique drilling and grouting pipe fixing method thereof - Google Patents
Double-layer casing pipe for upward and oblique drilling and grouting pipe fixing method thereof Download PDFInfo
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- CN115263230A CN115263230A CN202210862485.XA CN202210862485A CN115263230A CN 115263230 A CN115263230 A CN 115263230A CN 202210862485 A CN202210862485 A CN 202210862485A CN 115263230 A CN115263230 A CN 115263230A
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- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 230000004323 axial length Effects 0.000 claims abstract description 45
- 239000002002 slurry Substances 0.000 claims description 42
- 239000011440 grout Substances 0.000 claims description 12
- 239000003566 sealing material Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 238000007596 consolidation process Methods 0.000 claims description 6
- 238000005325 percolation Methods 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 4
- 239000004047 hole gas Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims description 2
- 238000005580 one pot reaction Methods 0.000 claims 1
- 239000003245 coal Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides an upward and oblique drilling double-layer sleeve, which comprises an outer pipe, wherein the outer pipe is hollow, two ends of the outer pipe are opened, one end of the outer pipe is provided with a first cover plate, the upward and oblique drilling double-layer sleeve also comprises an inner pipe, the inner pipe is sleeved in the outer pipe, and the diameter of the outer pipe is set as follows: d1The diameter of the inner tube is d2，d2＜d1An annular space is formed between the inner pipe and the outer pipe, and the axial length of the outer pipe is set to be S1The axial length of the inner tube is S2，
In the formula: s. the1-an outer tube axial length; s2-an inner tube axial length; d1-an outer tube diameter; d is a radical of2-an inner tube diameter; the second cover plate is sleeved at one end, close to the first cover plate, of the inner pipe, the first cover plate is connected with the second cover plate, grouting holes are formed in the pipe wall of the outer pipe, and the first cover plate and the second cover plate are hollow, so that water can be discharged from the first cover plate and the second cover plate.
Description
Technical Field
The invention relates to the field of underground drilling, upward hole drainage and water plugging, and borehole grouting and water plugging, in particular to an upward inclined borehole double-layer casing and a grouting and pipe fixing method thereof.
Background
The hydrogeological conditions of underground coal mines are complex, the water inflow is large, the purpose of pressure reduction, drainage and safety mining is achieved mainly through an upward inclined drilling hole pre-dredging and dredging method, water-filling aquifers of a roof are intensively constructed to detect (dredge) drainage drill holes before stoping of a working face, underground water in (dry) overburden aquifers is dredged in advance to reduce the roof water inflow strength in the stoping process, and in order to guarantee the roof water drainage effect, general coal mine production enterprises construct a large number of water detection and drainage drill holes according to underground tunneling conditions.
According to the requirements of 'water control regulations for coal mines', when water is detected in a place with the predicted water pressure greater than 0.1MPa, a sleeve is solidified in advance, and a gate valve is installed. In order to prevent the accidents of well flooding and people injury caused by the fact that water inflow of a water exploration and drainage hole is suddenly increased due to the fact that a water stop sleeve is not firmly installed and cannot stop water in time when a mine is in underground water exploration and drainage operation, the water stop sleeve needs to be firmly fixed in a drill hole when an inclined water drainage drill hole is formed in underground construction.
The existing method for consolidating casing of inclined borehole is to use accelerator (resin or chemical agent) to seal the outer ring of casing mouth and insert air guide hole after the casing is put into the borehole, then to inject cement slurry into the casing. After the air duct overflows cement paste, closing the air duct, then boosting pressure and grouting, closing a grouting valve after grouting is finished, and entering a stage to be coagulated; the upward and oblique drilling water-stopping sleeve pipe fixing mode cannot completely exhaust air and boost pressure and grouting, the effective fixing length formed in the pipe is low, and when high-pressure water exists in the hole, the pipe fixing is easy to be unstable and high in danger.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a double-layer casing pipe for upward and oblique drilling and a grouting pipe fixing method thereof, and solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a double-deck sleeve pipe of oblique drilling faces upward, includes the outer tube, outer tube cavity, both ends opening, the one end of outer tube are equipped with first apron, the double-deck sleeve pipe of oblique drilling faces upward still includes the inner tube, and in the outer tube was located to the inner tube cover, set for the outer tube diameter and do: d is a radical of1The diameter of the inner tube is d2，d2＜d1An annular space is formed between the inner pipe and the outer pipe, and the axial length of the outer pipe is set to be S1The axial length of the inner tube is S2，
In the formula: s1-an outer tube axial length; s2-an inner tube axial length; d1-an outer tube diameter; d2-an inner tube diameter;
the second cover plate is sleeved at one end, close to the first cover plate, of the inner pipe, the first cover plate is connected with the second cover plate, grouting holes are formed in the pipe wall of the outer pipe, and the first cover plate and the second cover plate are hollow, so that water can be discharged from the first cover plate and the second cover plate.
And a sealing gasket is arranged between the first cover plate and the second cover plate.
And a sealing material is filled in an annular space between the grouting hole and the first cover plate.
According to the force balance principle, the following steps are carried out:
from equations (1) and (2):
in the formula: s1-an outer tube axial length; s. the2-an inner tube axial length; d is a radical of1-an outer tube diameter; d2-an inner tube diameter; p-head pressure; f-the frictional resistance per unit area between the inner and outer tubes and the grout.
The method adopts the double-layer casing pipe of the inclined drilling hole as claimed in any one of the preceding claims, and comprises the following specific steps:
step one, constructing oblique boreholes with the bore diameter of D at underground water detection and drainage design positions of a working face roadway, old water, drilling water, fracture structural water, karst water, collapse columns and the like, wherein D is larger than D1；
Step two, installing an outer pipe in the upward inclined drill hole in the step one, wherein the outer pipe extends out of the upward inclined drill hole, filling sealing materials into an annular gap between the outer pipe and the orifice of the upward inclined drill hole to form a first annular plug, and installing a first cover plate on one side of the outer pipe close to the orifice;
thirdly, arranging a second cover plate at the end part of the inner pipe, pushing the inner pipe into the outer pipe from outside to inside, stopping at the position 50-100 mm away from the first cover plate and the second cover plate, connecting the first cover plate and the second cover plate, arranging a sealing gasket between the first cover plate and the second cover plate, filling a sealing material in an annular space between the grouting hole and the first cover plate to form a second annular plug, and connecting the grouting hole with a grouting pipe;
step four, the density is rho2 slurryThe slurry is injected into a gap between the inner pipe and the outer pipe through a grouting hole on the outer pipe, and the density is rho2 slurryThe slurry flows from the orifice of the grouting hole to the bottom of the hole at the high position of the inclined drilling hole, and the axial length of the slurry between the inner pipes is S2 pulpSetting rho2 pulp＞ρWater (I)＞ρQi (Qi)Driving water in the gap between the inner pipe and the outer pipe to move upwards, wherein the water has the axial length S along the inner pipe2 waterThe water drives the gas in the gap between the inner pipe and the outer pipe to move upwards, and the axial length of the gas along the inner pipe is S2 gasAccording to the Bingham fluid seepage differential equation, the following can be known:
in the formula: subscript 1 represents the slurry percolation region, subscript 2 represents the in-hole water percolation region, and subscript 3 represents the in-hole gas flow region; p0The grouting pressure at the orifice of the grouting pipe between the inner pipe and the outer pipe; s2 pulpIs the axial length of the slurry between the inner and outer tubes, S2 waterIs the axial length of water between the inner tube and the outer tube; p is a radical ofs2 slurry plus waterIs the axial length S between the inner pipe and the outer pipe2 slurry+S2 waterThe water pressure in the pores; p is a radical of formulas2Is the axial length S of the inner tube2The gas pressure at any position, S is the distance between the front surface position of the slurry and the orifice of the upward inclined drill hole and changes along with the lifting of the slurry, and S is more than or equal to 0 and less than or equal to S2The final consolidation needs to be satisfied in consideration of the stone shrinkage of the slurry
Compared with the prior art, the invention has the following technical effects:
the double-layer casing pipe for upward and oblique drilling and the grouting pipe fixing method thereof have the advantages that the consolidation process is simple, the reliability is high, slurry flows upwards from the bottom of the outer side of the casing pipe, air and accumulated water in an annular gap on the outer side of the casing pipe can be completely discharged, the effective consolidation length is increased, the pipe fixing effect is guaranteed, and by arranging the double-layer casing pipe, when the diameter of an orifice of the upward and oblique drilling hole is larger, the gap between the pipe wall and the rock wall can be reduced, and the bonding strength between the device and the rock wall is enhanced.
And (II) after the pipe is fixed by using an external circulation method, even if a grouting blind area is formed at the top end of the sleeve due to slurry precipitation, the slurry can be injected into the inner pipe for secondary slurry supplement and reinforcement, so that the effective consolidation length is increased, and the firmness of the pipe is enhanced.
(III) when the grout moves from the bottom of the orifice of the grouting hole to the bottom of the upper hole along the outer wall of the inner pipe, the orifice sealing material only needs to bear the dead weight of the grout and does not need to bear the additional grouting pressure such as the impact force, the water pressure and the like of the grout at the bottom of the hole.
According to the elevation and inclination drilling double-layer casing and the grouting and pipe fixing method thereof, before grouting and pipe fixing, through arranging the second annular plug, water gushing at the bottom of the elevation and inclination drilling hole forms a still water state in an annular space between the outer pipe and the inner pipe, meanwhile, the lower opening of the casing is opened, and the water gushing at the bottom of the hole can be discharged from the casing. When the outer circulation grouting is performed, the grouting amount and the grouting speed are controlled, the grout can slowly fill the whole annular space outside the outer pipe and the inner pipe from bottom to top by utilizing the specific gravity of the grout, when a small amount of water is discharged from the hole, the grout returns upwards from the hole opening to the hole bottom direction in the grouting process of the outer circulation method, the accumulated water and the discharged water in the hole are discharged to the inner pipe from the hole bottom, and the pipe fixing effect is not influenced by the accumulated water and the discharged water.
Drawings
FIG. 1 is a schematic view of a bottom-up hole double-layer casing and a solid pipe according to the present invention;
the meaning of the individual reference symbols in the figures is:
1-outer tube, 2-first cover plate, 3-inner tube, 4-second cover plate, 5-grouting hole, 6-first annular plug, 7-second annular plug, 8-sealing gasket, 9-rock wall and 10-connecting bolt.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments are given as examples of the present invention, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are included in the protection scope of the present invention.
Directional terms as used herein, such as "radial" and "axial" are intended to correspond to a particular direction on the page in the drawings or to a corresponding direction in the space shown in the drawings, and the direction of the arrows in the drawings indicates the direction of the slurry, water and gas flow.
Example 1:
the utility model provides a double-deck sleeve pipe of drilling to one side faces upward, includes outer tube 1, outer tube 1 cavity, both ends opening, the one end of outer tube 1 is equipped with first apron 2, double-deck sleeve pipe of drilling to one side faces upward still includes inner tube 3, and 3 covers of inner tube are located in outer tube 1, set for outer tube 1 diameter to be d1The diameter of the inner tube 3 is d2，d2＜d1An annular space is formed between the inner tube 3 and the outer tube 1, and the axial length of the outer tube 1 is set to be S1The axial length of the inner tube 3 is S2When the anti-skid force of sleeve pipe and thick liquid stone body is not less than water pressure and acts on sheathed tube thrust, the sleeve pipe just can be safe firm, does not take place the problem that the sleeve pipe became invalid, can know according to the equilibrium principle of power:
as can be seen from the equations 1 and 2,
in the formula: s1-an outer tube axial length; s2-an inner tube axial length; d1-an outer tube diameter; d2-an inner tube diameter; p-head pressure; f-unit area frictional resistance between the sleeve and the grouting material;
the water head pressure P is 2MPa, and the diameter d of the outer pipe10.13m, inner tube diameter d20.094m, and the friction force f per unit area between the sleeve and the grouting material is 6 x 103N/m2。
Calculated according to equation 1
Calculated according to equation 2
The inner tube 3 is close to the pot head of first apron 2 and establishes second apron 4, first apron 2 is connected with second apron 4, sets up slip casting hole 5 on the pipe wall of outer tube 1, and first apron 2 and second apron 4 cavity can make water discharge from the centre.
In this example, S2The method conforms to the equation, and can ensure that the sleeve is fixed in the oblique drilling hole and cannot fall off under the impact of water pressure.
The double-layer sleeve for the upward-inclined drilling hole of the embodiment can reduce the gap between the pipe wall and the rock wall and enhance the bonding strength of the device and the rock wall 9 by arranging the double-layer sleeve when the diameter of the hole opening of the upward-inclined drilling hole is larger.
As a preferable solution of this embodiment, a sealing gasket 8 is disposed between the first cover plate 2 and the second cover plate 4.
Wherein, the purpose of setting up sealing gasket is for preventing that the water that the drilling produced from flowing out between first apron 2 and second apron 4, and the annular space that the hole bottom of the hole of the oblique drilling gushes water in outer tube 1 and inner tube 3 forms the stagnant water state.
And the annular space between the grouting hole 5 and the first cover plate 2 is filled with sealing materials, so that the sealing effect is enhanced.
Example 2:
the method is characterized in that a conglomerate water-bearing stratum is arranged above 5m of a 3-1 coal seam roof of the Taran high-efficiency coal mine, the lower part of the water-bearing stratum contains no water about 15m, the water outlet position is about 20m away from the coal seam roof, the water pressure reaches 3.5MPa, when the water exploration and drainage drilling construction is carried out, in order to prevent the water outlet of the water-bearing stratum before a hole opening pipe is solidified, a two-stage sleeve structure with three-stage hole diameters (3 hole diameters are formed in the process from hole opening to final hole and are respectively from large to small) is required to be adopted, the threat of high-pressure water of the water-bearing stratum close to the coal seam is mainly resisted, and the success or failure of the water exploration and drainage engineering and the safety of a mine are directly influenced by the quality of the sleeve construction.
A double-layer casing grouting and pipe fixing method for an upward-inclined borehole comprises the following specific steps of:
firstly, constructing an oblique drilling hole with the aperture D of 170mm at an underground water detecting and releasing design position of a working face roadway, old water, drilling water, fracture structural water, karst water, a collapse column and the like; outer tube diameter d10.13m, inner tube diameter d20.094m, and the friction force f per unit area between the sleeve and the grouting material is 8 x 103N/m2。
Calculated according to equation 1
Get S1Is 15m;
calculated according to equation 2
Get S2Is 20m.
Step two, installing an outer pipe 1 in the upward inclined drill hole in the step one, extending the outer pipe 1 out of the upward inclined drill hole, filling a sealing material in an annular gap between the outer pipe 1 and the orifice of the upward inclined drill hole to form a first annular plug 6, arranging a grouting pipeline in the first annular plug 6 in the practical application process, filling slurry between the outer pipe 1 and the orifice wall of the upward inclined drill hole through the grouting pipeline, fixing the outer pipe 1 on the upward inclined drill hole, and installing a first cover plate 2 on one side of the outer pipe 1 close to the orifice;
thirdly, arranging a second cover plate 4 at the end part of the inner tube 3, pushing the inner tube 3 into the outer tube 1 from outside to inside, stopping at the position where the distance between the first cover plate 2 and the second cover plate 4 is 50-100 mm, preventing the second cover plate 4 from impacting the first cover plate 2, arranging a sealing gasket 8 between the first cover plate 2 and the second cover plate 4, connecting the first cover plate 2 and the second cover plate 4 by adopting a connecting bolt, filling a sealing material in an annular space between the grouting hole 5 and the first cover plate 2 to form a second annular plug 7, and connecting the grouting hole 5 with the grouting tube;
step four, the density is rho2 slurryThe slurry is injected into a gap between the inner pipe and the outer sleeve through a grouting hole on the outer pipe, and the density is rho2 pulpThe grout flows from the orifice of the grouting hole to the bottom of the hole at the high position of the upward inclined drilling hole, and the axial length of the grout between the inner pipe and the outer pipe is S2 slurrySetting rho2 slurry＞ρWater (W)＞ρQi (Qi)The water in the gap between the inner pipe and the outer sleeve is driven to move upwards, and the axial length of the water between the inner pipe and the outer pipe is S2 waterThe water drives the gas in the gap between the inner pipe and the outer pipe to move upwards, and the axial length of the gas between the outer part of the sleeve and the hole wall is S2 gas，
In the formula: subscript 1 represents the slurry percolation region, subscript 2 represents the in-hole water percolation region, and subscript 3 represents the in-hole gas flow region; p is0The grouting pressure at the pipe orifice of the grouting pipe between the inner pipe and the outer pipe; s2 pulpIs the axial length of the slurry between the inner and outer tubes, S2 waterIs the axial length between the inner and outer tubes; p is a radical ofs2 slurry plus waterIs the axial length S between the inner pipe and the outer pipe2 pulp+S2 waterThe water pressure in the pores; p is a radical ofs2Is the axial length S of the inner tube2The gas pressure at any position, s is the distance between the front position of the slurry and the orifice, changes along with the lifting of the slurry, s is more than or equal to 0 and less than or equal to 20, and the slurry is consideredThe stone shrinkage needs to satisfy that s is more than or equal to 19.66 and less than or equal to 20 after the final consolidation.
According to the formula (4), the slurry moves upwards from the bottom of the outer side of the inner pipe, the distance S between the slurry front position and the orifice is gradually increased from the initial position to 20m, and the axial length of the gas in the hole between the inner pipe and the outer pipe is gradually increased from S2 atmosphereThe axial length of the water in the hole between the inner pipe and the outer pipe is S all the time in the process of exhausting the gas in the hole2 waterWhen all the gas is discharged, the axial length of the gas between the inner pipe and the outer pipe is reduced to 0, and then the axial length of the water in the hole between the inner pipe and the outer pipe is changed from S2 waterAnd finally, the inner pipe is completely discharged from the bottom of the hole, the slurry discharged from the inner part of the inner pipe is taken as an end standard, the air and the accumulated water in the annular space can be completely discharged, and the slurry bonds the inner pipe 3 and the outer pipe 1 into a whole, so that the sleeve is tightly and fixedly connected with the hole wall 9.
Claims (5)
1. A double-layer casing for upward and oblique drilling comprises an outer pipe (1), wherein the outer pipe (1) is hollow, two ends of the outer pipe are opened, one end of the outer pipe (1) is provided with a first cover plate (2), and the double-layer casing is characterized in that,
it still includes inner tube (3) to pitch up double-deck sleeve pipe of inclined drilling, and in outer tube (1) was located in inner tube (3) cover, set for outer tube (1) diameter and do: d is a radical of1The diameter of the inner tube (3) is d2，d2＜d1An annular space is formed between the inner pipe (3) and the outer pipe (1), and the axial length of the outer pipe (1) is set to be S1The axial length of the inner tube (3) is S2，
In the formula: s1-an outer tube axial length; s2-an inner tube axial length; d1-an outer tube diameter; d2-an inner tube diameter;
second apron (4) are established to one pot head that inner tube (3) are close to first apron (2), first apron (2) are connected with second apron (4), set up slip casting hole (5) on the pipe wall of outer tube (1), and first apron (2) and second apron (4) cavity can make water discharge from the centre.
2. The uphole double casing according to claim 1, characterized in that a sealing gasket (8) is provided between the first cover plate (2) and the second cover plate (4).
3. The double sleeve for uphole drilling according to claim 2, characterized in that the annular space between the grouting hole (5) and the first cover plate (2) is filled with a sealing material.
4. The uphole double casing of claim 1 wherein the force balance is based on the principle of force balance:
from equations (1) and (2):
in the formula: s1-an outer tube axial length; s. the2-an inner tube axial length; d1-an outer tube diameter; d2-an inner tube diameter; p-head pressure; f-the frictional resistance per unit area between the inner and outer tubes and the grout.
5. A double-layer casing grouting and pipe fixing method for an upward-inclined borehole, which is characterized by adopting the double-layer casing grouting and pipe fixing method for the upward-inclined borehole of any one of the preceding claims, and comprises the following specific steps:
step one, in a working face roadway, old water, drilling water and a fracture structureConstructing oblique upward drill holes with the bore diameter of D at underground water exploration and drainage design positions such as water, karst water, collapse columns and the like, wherein D is more than D1；
Step two, installing an outer pipe (1) in the upward-inclined drill hole in the step one, wherein the outer pipe (1) extends out of the upward-inclined drill hole, filling sealing materials in an annular gap between the outer pipe (1) and the orifice of the upward-inclined drill hole to form a first annular plug (6), and installing a first cover plate (2) on one side, close to the orifice, of the outer pipe (1);
thirdly, arranging a second cover plate (4) at the end part of the inner pipe (3), pushing the inner pipe (3) into the outer pipe (1) from outside to inside, stopping at the position 50-100 mm away from the first cover plate (2) and the second cover plate (4), connecting the first cover plate (2) and the second cover plate (4), arranging a sealing gasket between the first cover plate and the second cover plate, filling a sealing material into an annular space between the grouting hole (5) and the first cover plate (2) to form a second annular plug (7), and connecting the grouting hole (5) with a grouting pipe;
step four, the density is rho2 slurryThe slurry is injected into a gap between the inner pipe (3) and the outer pipe (1) through a grouting hole (5) on the outer pipe (1), and the density is rho2 pulpThe grout flows from the orifice of the grouting hole (5) to the bottom of the hole at the high position of the upward inclined drilling hole, and the axial length of the grout between the inner pipes (2) is S2 pulpSetting rho2 pulp＞ρWater (I)＞ρQi (Qi)The water in the gap between the inner pipe (3) and the outer pipe (1) is driven to move upwards, and the axial length of the water along the inner pipe (3) is S2 waterThe water drives the gas in the gap between the inner pipe (3) and the outer pipe (1) to move upwards, and the axial length of the gas along the inner pipe is S2 atmosphereAccording to the Bingham fluid seepage differential equation, the following can be known:
in the formula: subscript 1 represents the slurry percolation region, subscript 2 represents the in-hole water percolation region, and subscript 3 represents the in-hole gas flow region; p is0The grouting pressure at the orifice of the grouting pipe between the inner pipe and the outer pipe; s2 slurryIs the axial length of the slurry between the inner and outer tubes, S2 waterFor water between the inner and outer tubesThe axial length of (a); p is a radical ofs2 slurry plus waterIs the axial length S between the inner pipe and the outer pipe2 pulp+S2 waterThe water pressure in the pores; p is a radical ofs2Is the axial length S of the inner tube2The gas pressure at any position, S is the distance between the front surface position of the slurry and the orifice of the upward inclined drill hole and changes along with the lifting of the slurry, and S is more than or equal to 0 and less than or equal to S2The final consolidation needs to be satisfied in consideration of the stone shrinkage of the slurry
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|---|---|---|---|---|
| CN101979820A (en) * | 2010-10-25 | 2011-02-23 | 山东大学 | A technology for sealing the water-stop casing of drilling at an elevation angle |
| CN102242635A (en) * | 2011-07-20 | 2011-11-16 | 铜陵中都矿山建设有限责任公司 | Embedding construction method of orifice pipe |
| CN105781586A (en) * | 2016-04-27 | 2016-07-20 | 安徽恒源煤电股份有限公司 | Device for filtering flow and releasing pressure on water inrush borehole and sleeving tube in hole for grouting, fixing tube and blocking and tube-fixing and blocking method thereof |
| CN210370586U (en) * | 2019-05-28 | 2020-04-21 | 徐州大屯工程咨询有限公司 | Water outlet elevation drilling and grouting water stopping device |
| CN210239644U (en) * | 2019-06-13 | 2020-04-03 | 国家能源投资集团有限责任公司 | A slip casting hole sealing device for exploring drainage drilling in pit |
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| CN115263230B (en) | 2024-06-28 |
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