CN114704322A - Catchment prevention and control method for goaf without coal pillars - Google Patents
Catchment prevention and control method for goaf without coal pillars Download PDFInfo
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- CN114704322A CN114704322A CN202210256987.8A CN202210256987A CN114704322A CN 114704322 A CN114704322 A CN 114704322A CN 202210256987 A CN202210256987 A CN 202210256987A CN 114704322 A CN114704322 A CN 114704322A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000002265 prevention Effects 0.000 title abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000002955 isolation Methods 0.000 claims abstract description 40
- 238000005065 mining Methods 0.000 claims abstract description 38
- 125000006850 spacer group Chemical group 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 33
- 230000006641 stabilisation Effects 0.000 claims description 16
- 238000011105 stabilization Methods 0.000 claims description 16
- 238000009792 diffusion process Methods 0.000 claims description 14
- 238000010276 construction Methods 0.000 claims description 13
- 238000009933 burial Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 8
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- 239000004567 concrete Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The embodiment of the invention relates to the technical field of water prevention and control in coal mining and discloses a water catchment prevention and control method for a goaf without coal pillars. The method comprises the following steps: s1, determining the position, thickness and height of the isolation wall body in the non-suspended ceiling area according to the mining height, mining depth and roof strength; s2, arranging a water pipe, a short grouting pipe and a long grouting pipe on the gob entry side; s3, lagging behind the working face by 1-2 periods to press the pace, injecting coarse aggregate and quick setting slurry from bottom to top through the short grouting pipe until the final pressure of grouting is reached to form a quick setting retaining wall; s4, after the rapid hardening retaining wall is completely poured, filling slurry is poured into the long grouting pipe from bottom to top until the final pressure of grouting is reached to form a filling spacer, and finally the whole isolation wall is completed; and S5, collecting and draining the goaf. The invention solves the problems of production interference and even mine flood caused by water collection in a mining area in the process of non-pillar mining on the basis of no suspended roof above a wall body and strength capable of resisting mine pressure influence.
Description
Technical Field
The invention relates to a method for preventing and controlling water catchment in a goaf without coal pillars, which can prevent water catchment waves in the goaf and safe stoping of a working face and simultaneously play a role in reinforcing and stabilizing a roadway without coal pillars.
Background
At present, a plurality of mining areas in China mainly adopt a total caving method to manage the goafs, so that adjacent goafs are communicated with one another, a large-area composite goaf is formed, accumulated water is difficult to completely drain due to the influence of the inclination angle of a coal seam, and partial working surfaces face the technical problem that the accumulated water in the composite goaf is merged into a production working surface. While the cost of mine drainage increases, the safety production also faces a threat. Therefore, the water burst blocking technical method suitable for various mine conditions is researched and developed successively.
Compared with the fracture and fault grouting environment of common underground engineering, the mine goaf is formed by stacking loose rocks after caving, the penetration degree of an internal gap is complex, and the influence of a ponding environment is added, so that a grouting plugging method which comprehensively considers the goaf sealing impermeability effect, the grouting spacer layout parameter and strength, the grouting material diffusion characteristic and the flowing water grouting pressure is urgently needed in practical engineering application.
Disclosure of Invention
The invention aims to provide a method for solving water collection waves of a coal-pillar-free goaf and safe stoping of a working face, which solves the water collection problem of the coal-pillar-free goaf by adopting a mode of coal-pillar-free side drilling grouting, construction of a rapid-hardening retaining wall and filling of a spacer.
In order to achieve the purpose of the invention, the technical scheme of the invention is as follows:
a method for preventing and treating catchment in a goaf without coal pillars comprises the following steps:
s1, determining the position, thickness and height of an isolation wall body of the non-suspended ceiling area according to the factors of mining height, mining depth and roof strength, wherein the isolation wall body comprises a quick-setting retaining wall and a filling partition body;
s2, arranging a water conveying pipe, a short grouting pipe and a long grouting pipe on the gob entry side, wherein the position of a terminal opening of the water conveying pipe is always 1-2 m outside the boundary of the isolation wall body;
s3, lagging a working surface by 1-2 periods of step pressing, and injecting coarse aggregate and quick setting slurry from bottom to top through the short grouting pipe until the final pressure of grouting is reached to form a quick setting retaining wall;
s4, after the step S3 of pouring the quick-setting retaining wall for 30min, pouring filling slurry into the long grouting pipe from bottom to top until the final grouting pressure is reached to form a filling partition, and finally completing the whole isolation wall;
and S5, collecting and draining the goaf after the partition wall is laid through a water delivery pipe.
The method for determining the position, the thickness and the height of the isolation wall body comprises the following steps:
s11, acquiring mining depth, coal seam mining height and roof strength data of the target grouting goaf;
s12, sequentially dividing the mining depth into shallow burying with the mining depth of less than 300m, medium burying with the mining depth of 300-600 m and deep burying with the depth of more than 600m according to the mining depth of the position of the target grouting goaf;
s13, sequentially dividing the coal seam mining height of the position of the target grouting goaf into a thin coal seam with the layer thickness of less than 1.3m, a medium-thickness coal seam with the layer thickness of 1.3-3.5 m and a thick coal seam with the layer thickness of more than 3.5 m;
s14, sequentially dividing the top plate strength of the position of the target grouting goaf into a soft top plate with the strength of less than 3, a medium-hard top plate with the strength of 3-6 and a hard top plate with the strength of more than 6 according to the rock Pythrithm coefficient;
s15, comprehensively mining height, mining depth and roof strength factors, and determining the position, thickness and height of the isolation wall body, wherein the specific standards are as shown in tables a-c:
a. the buried depth of the coal seam at the position of the target grouting goaf is shallow:
b. the coal seam burial depth of the position where the target grouting goaf is located is medium burial depth:
c. the coal seam burial depth of the position where the target grouting goaf is located is deep:
the thickness of the quick-setting retaining wall is determined according to the maximum allowable dead zone water head height, and the table is as follows:
the final pressure of coarse aggregate and the final pressure of grouting of the rapid-setting retaining wall are determined according to the goaf water head height and the slurry diffusion range, and are shown in the following table:
the filling spacer grouting final pressure is determined according to the goaf water head height and the slurry diffusion range, and is shown in the following table:
grouting the rapid hardening retaining wall by adopting a segmented construction method, arranging grouting drill holes in a staggered manner from bottom to top along a roadway side, firstly, injecting rapid hardening slurry into the lower grouting hole, and forming the lower rapid hardening retaining wall after stabilization; secondly, injecting quick setting grout into the middle position grouting hole, and forming a middle position quick setting retaining wall after stabilization; injecting rapid hardening slurry into the upper grouting hole again, and forming an upper rapid hardening retaining wall after stabilization;
the filling isolation wall grouting sequence is consistent with the rapid hardening wall grouting sequence, but the filling isolation wall grouting sequence and the rapid hardening wall grouting sequence are carried out after a certain distance, and the filling isolation wall grouting sequence and the rapid hardening wall grouting sequence form a stable isolation wall finally.
Before the grouting drill holes are arranged, the water conveying pipeline is arranged in a drilling mode, the position of a water conveying pipe terminal opening is always located 1-2 m outside the boundary of the isolation wall body, the water inlet of the pipeline is subjected to anti-blocking treatment, and the water pressure sensor and the valve are arranged at the water outlet.
The grouting holes are arranged in an upper, middle and lower staggered mode, the hole distance is equal to the slurry diffusion radius, the middle grouting hole and the lower grouting hole are arranged in a diffusion radius mode in a staggered mode, and the upper grouting hole and the lower grouting hole are arranged vertically.
Burying short grouting pipes and long grouting pipes at intervals of 5-10 m and 15-25 m respectively, laying long grouting pipes and short grouting pipes with corresponding depths at the positions of the step S1,
the invention has the beneficial effects that:
compared with the existing goaf vertical grouting technology and water control measures, the goaf catchment control method without the coal pillars has the following characteristics and advantages:
1. the isolation wall body with a certain length, width and height is constructed by adopting a coal pillar-free goaf side horizontal grouting mode, so that the defects of long punching period, high grouting blindness, large slurry material loss and the like caused by large-range grouting from a certain layer position to punch holes in a goaf are overcome, and the stable isolation wall body can be accurately, quickly and conveniently constructed;
2. the rapid-hardening retaining wall and the filling spacer are constructed in a mode that 1-2 periodic pressure steps are lagged behind a working face and penetrate into a goaf for a certain depth, so that goaf catchment effective isolation in a dynamic water and dynamic pressure environment can be realized, and long-term stability of an isolation wall body under the influence of repeated mining is guaranteed;
3. the original space of the goaf is utilized, no coal pillars are required to be reserved, an isolation wall body is constructed in a mode of coarse aggregate filling, quick-setting retaining wall water insulation and filling and isolating body reinforcing, water collection and drainage are carried out by matching with a water delivery pipe, the construction process system is simple, and the cost of preventing and treating water is low;
4. according to the parameters such as the buried depth, the coal thickness, the roof strength, the water head height and the like, the position, the height, the width, the grouting final pressure and the like of the rapid-setting retaining wall and the filling spacer are reasonably determined, so that the method is universally applied to the water control process of the mine goaf under various geological conditions, and has wide application prospect.
Drawings
FIG. 1 is a schematic diagram (section along the working face) of the construction effect of a goaf entry-retaining side rapid-hardening retaining wall in the invention;
FIG. 2 is a construction drawing (section along the working face) for grouting, drilling and laying the quick-setting retaining wall;
FIG. 3 is a schematic diagram (section along the working face) of the construction effect of the goaf entry side filling partition body;
FIG. 4 is a construction drawing (section along the working face) for grouting, drilling and laying of filling spacers;
FIG. 5 is a parameter diagram of a goaf grouting pipe;
FIG. 6 is a flow chart of the catchment prevention and control method of the goaf without pillars;
wherein:
1, reserving a roadway; 2, collecting the empty area; 3, conveying a water pipe; 4, lower quick-setting grouting holes; 5, a middle position quick setting grouting hole; 6, an upper rapid hardening grouting hole;
7, a lower quick-setting retaining wall; 7-1, a first lower rapid-setting retaining wall; 7-2 second lower rapid hardening retaining wall; 7-3 a third lower quick-setting retaining wall; 7-4, a fourth lower rapid hardening retaining wall; 7-5 a fifth lower quick-setting retaining wall; 7-6 sixth lower quick-setting retaining wall;
8, a middle position quick setting retaining wall; 8-1, a first middle position quick setting retaining wall; 8-2, a second median rapid hardening retaining wall; 8-3, a third median rapid hardening retaining wall; 8-4 fourth middle position quick setting retaining wall;
9, an upper position rapid hardening retaining wall; 9-1, a first upper rapid hardening retaining wall; 9-2 second upper rapid hardening retaining wall; 9-3, a third upper position rapid hardening retaining wall; 9-4 fourth upper quick-setting retaining wall;
10 filling grouting holes at the lower part; 11 filling a grouting hole in the middle position; 12 filling grouting holes at the upper part;
13 filling a spacer at the lower part; 13-1 first lower filling spacer; 13-2 second lower filling spacers; 13-3 a third lower filling spacer;
14 filling a spacer in the middle position; 14-1 filling a spacer in the first middle position; 14-2 filling a spacer in the second middle position; 14-3 filling a spacer in the third middle position;
15 filling the upper part with a spacer; 15-1 a first upper filling spacer; 15-2 second upper filling spacer;
16 grouting pipes; 17 grouting holes at two sides of the grouting pipe; and 18 grouting pipe lower grouting holes.
Detailed Description
The invention will be further described with reference to the following figures and examples:
example of the implementation
The inclined average inclination angle of a coal seam of a certain mine is 6 degrees, the trend average inclination angle is 4 degrees, the topography of a cutting position of a working face is lower, the average thickness of the coal seam is 1.6m, the immediate roof is silty claystone with the average thickness of 5.27m, the basic roof is flint limestone with the average thickness of 4.79m, the burial depth is 450m, and the height of a stoping roadway is 2.5m, and the width is 5.2 m. Because the whole mining is carried out by adopting the coal pillar-free mining method, after the mining is carried out by the working face caving method, the accumulated water in a large area of the goaf is collected, so that the stoping of the working face of the lower section is continuously threatened by the water collection of the goaf of the upper section, and the average water inflow of the goaf side of the stoping face at present is 50m3And h, the horizontal average depth of the accumulated water in the roadway within the range of 200m from the cut hole of the lower roadway of the working surface is about 500mm, the hydrostatic pressure is less than 0.1MPa, and if plugging is not carried out, the accumulated water is converged into the next working surface. Referring to fig. 1, fig. 2, fig. 3 and fig. 4, a method for controlling catchment in a goaf without pillars is performed according to the following steps:
in the embodiment, the mining depth of the target grouting goaf is 450m, the mining height of a coal bed is 1.6m, and the roof is silty claystone and flint limestone, so that the mining depth of the position of the target grouting goaf is determined to be medium burial depth (300-600 m), the mining height of the coal bed of the position of the target grouting goaf is determined to be medium coal bed (1.3-3.5 m), and the roof strength of the position of the target grouting goaf is determined to be hard roof (Pushi strength coefficient > 6).
According to the factors of mining height, mining depth and roof strength in the embodiment, the distance between the position of the isolation wall and the coal pillar-free roadway side is determined to be 15m, the thickness of the isolation wall is 4m, and the height of the isolation wall is 1.6 m.
Under the condition that the thickness of the isolation wall is 4m, the thickness of the rapid-setting retaining wall is determined to be 1.5m, the thickness of the filling isolation wall is determined to be 2.5m, the height of a water head of a dead zone is allowed to be 15m, and the requirements of the embodiment are met.
The grouting diffusion range of the quick-setting retaining wall in the embodiment is 10m, the hydrostatic water pressure is less than 0.1MPa, the final grouting pressure of coarse aggregate is determined to be 0.7MPa, and the final grouting pressure of quick-setting slurry is determined to be 1.3 MPa.
The grouting diffusion range of the filling spacer of the embodiment is 20m, the hydrostatic pressure is less than 0.1MPa, and the final grouting pressure is determined to be 1.5 MPa.
In the embodiment, broken rocks and river sand are selected as coarse aggregates, the particle size is 5-10 mm, the coarse aggregates are injected through a quick-setting grouting pipe, and the grouting is finished when the grouting final pressure reaches 0.7 MPa.
The concrete requirements of the cement-water glass double-liquid quick setting slurry are as follows: the cement slurry water-cement ratio is 1:1.2 (mass ratio), the water glass modulus is 2.8, the concentration is 38-42 DEG Be, and the cement slurry: the volume ratio of the water glass is 1:0.6, and 3 percent of lime (Ca (OH) 2) by mass is added]Accelerating the coagulation, controlling the grouting speed at 30m3And h, finishing grouting when the final pressure of grouting reaches 1.3 MPa.
The concrete requirements of the cement filling slurry with gangue-fly ash as aggregate are as follows: gangue: fly ash: cement is 14:10:1, the water cement ratio is 0.8:1, and the crushed coal gangue with the grain size less than 0.08mm needs to account for more than 16% of the coal gangue material; the grouting speed is controlled at 60m3And h, finishing grouting when the final pressure of grouting reaches 1.5 MPa.
Quick-setting retaining wall construction process flow
As shown in fig. 1, a grouting drill hole 4 is arranged on one side of the non-pillar roadway 1 close to the goaf 2 and spaced from the bottom plate by 0.6m, a grouting drill hole 5 is arranged on one side of the non-pillar roadway 1 spaced from the bottom plate by 1.2m, and a grouting drill hole 6 is arranged on one side of the non-pillar roadway 1 spaced from the bottom plate by 1.8 m. The drilling depth is 16m and the diameter is 32 mm. And (3) putting a seamless steel pipe with the diameter of 32mm and the length of 5m as a sleeve for wall protection, putting a grouting pipe with the length of 16m and the diameter of 28mm for grouting, wherein the grouting material is prepared quick-setting slurry to form a quick-setting retaining wall, and the thickness of the formed quick-setting wall is 1.5 m.
As shown in fig. 2, the grouting sequence is according to the marked serial numbers in the figure, and sequentially comprises: firstly, injecting quick-setting grout into a lower grouting hole 4, and forming a first lower quick-setting retaining wall 7-1 and a second lower quick-setting retaining wall 7-2 after stabilization; secondly, injecting quick setting grout into the middle position grouting holes 5, and forming a first middle position quick setting retaining wall 8-1 after stabilization; injecting the quick-setting slurry into the lower-position grouting hole 4 again, and forming a third lower-position quick-setting retaining wall 7-3 after stabilization; injecting quick-setting slurry from the secondary median grouting hole 5, and forming a second median quick-setting retaining wall 8-2 after stabilization; and finally, injecting quick setting slurry into the upper position grouting hole 6, and forming a first upper position quick setting retaining wall 9-1 after stabilization. And then sequentially grouting according to the sequence of a fourth lower quick-setting retaining wall 7-4, a third middle quick-setting retaining wall 8-3, a second upper quick-setting retaining wall 9-2, a fifth lower quick-setting retaining wall 7-5, a fourth middle quick-setting retaining wall 8-4 and a third upper quick-setting retaining wall 9-3 …, thereby completing the layout of the whole quick-setting retaining wall.
Filling partition construction process flow
As shown in fig. 3, according to the construction process of the rapid hardening retaining wall, grouting drill holes 4 are arranged on the side of the non-pillar roadway 1 close to the gob 2 and spaced from the bottom plate by 0.6m, grouting drill holes 5 are arranged on the side spaced from the bottom plate by 1.2m, and grouting drill holes 6 are arranged on the side spaced from the bottom plate by 1.8 m. The drilling depth is 18m and the diameter is 32 mm. And (3) putting a seamless steel pipe with the diameter of 32mm and the length of 5m as a sleeve for wall protection, putting a grouting pipe with the length of 16m and the diameter of 28mm for grouting, wherein the grouting material is prepared filling slurry to form a filling spacer, and the thickness of the formed filling wall is 2.5 m.
As shown in FIG. 4, the grouting sequence is consistent with that of the quick-setting retaining wall according to the marked serial numbers in the figure, namely: firstly, filling grout is injected into a lower grouting hole 10, and a first lower filling spacer 13-1 and a second lower filling spacer 13-2 are formed after stabilization; then filling slurry is injected into the middle filling hole 11, and a first middle filling spacer 14-1 is formed after stabilization; filling slurry is injected into the lower filling hole 10 again, and a third lower filling spacer 13-3 is formed after stabilization; filling slurry is injected into the middle filling hole 11 from the second time, and a second middle filling spacer 14-2 is formed after stabilization; and finally, filling slurry is injected into the upper filling hole 12, and the first upper filling spacer 15-1 is formed after stabilization. And then sequentially grouting according to the sequence of a fourth lower filling spacer 13-4, a third middle filling spacer 14-3, a second upper filling spacer 15-2, a fifth lower filling spacer 13-5, a fourth middle filling spacer 14-4 and a third upper filling spacer 15-3 …, thereby completing the layout of the whole filling spacer. It should be noted that the grouting of the filling spacer needs to be delayed for a certain distance from the grouting of the quick-setting retaining wall all the time.
Grouting hole arrangement
As shown in fig. 2, the grouting holes are arranged in an upper, middle and lower staggered manner, the hole spacing must be set to cover the goaf in the whole range by the diffusion grout, the diffusion radius of the rapid hardening grout in the embodiment is 5m, therefore, the grouting hole spacing is 5m, the middle grouting hole and the lower grouting hole are arranged in a staggered manner at a spacing of 2.5m, and the upper grouting hole and the lower grouting hole are arranged vertically. In the embodiment, the diffusion radius of filling slurry is 10m, so that the distance between grouting holes is 10m, the middle grouting holes and the lower grouting holes are arranged at a staggered distance of 5m, and the upper grouting holes and the lower grouting holes are arranged vertically.
Grouting pipe parameters
As shown in figure 5, the grouting pipe 16 is closed at the pipe head, the front section of the pipe is respectively perforated at two sides 17 and the lower part 18, the perforation interval is 100mm, the aperture is 7mm, the perforation length is consistent with the thickness of the constructed isolation wall, the quick setting retaining wall is 1.5m, and the filling isolation body is 2.5 m.
Water delivery pipe arrangement
As shown in fig. 1, before grouting and drilling are arranged, a water pipe 3 is arranged in a drilling mode at a position 20cm away from a bottom plate on one side of a non-pillar roadway 1 close to a gob 2, the drilling depth is 20m, the diameter is 32mm, a seamless steel pipe with the diameter of 32mm is used as a water pipe, and the thickness of the pipe wall is adjusted according to the surrounding rock pressure of the roadway. The water inlet of the pipeline is subjected to anti-blocking treatment, and the water pressure sensor and the valve are arranged at the water outlet.
The length of the constructed wall body is 200m, so that the water conveying pipes are arranged at intervals of 50m, the height of accumulated water is converted through water pressure, and when the height reaches two thirds of the height of the isolation wall body, a valve is opened to communicate with a water conveying pipeline to collect and drain water in the goaf.
The benefits brought by the embodiment of the invention are as follows: in the practical implementation case, the length of the isolation wall body is 200m, the effective isolation height is 1.7m, and the construction period is 21 days. After construction, the catchment of the goaf is effectively controlled, and the accumulated water is periodically drained through the water delivery pipe connecting pipeline, so that the catchment of the goaf without coal pillars is effectively prevented from flowing into the next working face. Meanwhile, the isolation wall ensures the stability of the stoping roadway, so that the safe stoping of the mine is realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for preventing and treating catchment in a goaf without coal pillars is characterized by comprising the following steps:
s1, determining the position, thickness and height of an isolation wall body of the non-suspended ceiling area according to the factors of mining height, mining depth and roof strength, wherein the isolation wall body comprises a quick-setting retaining wall and a filling partition body;
s2, arranging a water conveying pipe, a short grouting pipe and a long grouting pipe at the gob entry side, wherein the position of a water conveying pipe terminal port is always 1-2 m outside the boundary of the isolation wall body;
s3, lagging a working surface by 1-2 periods of step pressing, and injecting coarse aggregate and quick setting slurry from bottom to top through the short grouting pipe until the final pressure of grouting is reached to form a quick setting retaining wall;
s4, after the step S3 of pouring the quick-setting retaining wall for 30min, pouring filling slurry into the long grouting pipe from bottom to top until the final grouting pressure is reached to form a filling partition, and finally completing the whole isolation wall;
and S5, collecting and draining the goaf after the partition wall is laid through a water delivery pipe.
2. The method for preventing and treating catchment in goaf without coal pillars as claimed in claim 1, wherein the method for determining the position, thickness and height of the isolation wall body comprises:
s11, acquiring mining depth, coal seam mining height and roof strength data of the target grouting goaf;
s12, sequentially dividing shallow burial with the mining depth of less than 300m, medium burial with the mining depth of 300-600 m and deep burial with the mining depth of more than 600m according to the mining depth of the position of the target grouting goaf;
s13, sequentially dividing the coal seam mining height of the position of the target grouting goaf into a thin coal seam with the layer thickness of less than 1.3m, a medium-thickness coal seam with the layer thickness of 1.3-3.5 m and a thick coal seam with the layer thickness of more than 3.5 m;
s14, sequentially dividing the top plate strength of the position of the target grouting goaf into a soft top plate with the strength of less than 3, a medium-hard top plate with the strength of 3-6 and a hard top plate with the strength of more than 6 according to the rock Pythrithm coefficient;
s15, comprehensively mining height, mining depth and roof strength factors, and determining the position, thickness and height of the isolation wall body, wherein the specific standards are as shown in tables a-c:
a. the buried depth of the coal seam at the position of the target grouting goaf is shallow:
b. the coal seam burial depth of the position where the target grouting goaf is located is medium burial depth:
c. the coal seam burial depth of the position where the target grouting goaf is located is deep:
3. the method for preventing and treating catchment in goaf without coal pillar as claimed in claim 1, wherein: and determining the thickness of the rapid hardening retaining wall according to the maximum allowable dead zone water head height, as shown in the following table:
4. the method for preventing and treating catchment in goaf without coal pillar as claimed in claim 1, wherein: the final pressure of coarse aggregate and the final pressure of grouting of the rapid-setting retaining wall are determined according to the goaf water head height and the slurry diffusion range, and are shown in the following table:
5. the method for preventing and treating catchment in goaf without coal pillar as claimed in claim 1, wherein: the filling spacer grouting final pressure is determined according to the goaf water head height and the slurry diffusion range, and is shown in the following table:
6. the method for preventing catchment in a goaf without coal pillar according to claim 1, characterized in that: grouting the rapid hardening retaining wall by adopting a segmented construction method, arranging grouting drill holes in a staggered manner from bottom to top along a roadway side, firstly, injecting rapid hardening slurry into the lower grouting hole, and forming the lower rapid hardening retaining wall after stabilization; secondly, injecting quick-setting slurry into the middle position grouting hole, and forming a middle position quick-setting retaining wall after stabilization; finally, injecting quick setting slurry into the upper position grouting hole to form an upper position quick setting retaining wall after stabilization;
the filling isolation wall grouting sequence is consistent with the rapid hardening wall grouting sequence, but the filling isolation wall grouting sequence and the rapid hardening wall grouting sequence are carried out after a certain distance, and the filling isolation wall grouting sequence and the rapid hardening wall grouting sequence form a stable isolation wall finally.
7. The method for preventing catchment in a goaf without coal pillar according to claim 1, characterized in that: before the grouting drilling holes are arranged, a water conveying pipeline is arranged in a drilling mode, the position of a water conveying pipeline terminal opening is always 1-2 m away from the boundary of the isolation wall body, the water inlet of the pipeline is subjected to anti-blocking treatment, and a water pressure sensor and a valve are arranged at the water outlet.
8. The method for preventing catchment in a goaf without coal pillar according to claim 1, characterized in that: the grouting holes are arranged in an upper, middle and lower staggered mode, the hole distance is equal to the slurry diffusion radius, the middle grouting hole and the lower grouting hole are arranged in a diffusion radius mode in a staggered mode, and the upper grouting hole and the lower grouting hole are arranged vertically.
9. The method for preventing catchment in a goaf without coal pillar according to claim 1, characterized in that: and (5) embedding short grouting pipes and long grouting pipes at intervals of 5-10 m and 15-25 m respectively, and laying the long grouting pipes and the short grouting pipes with corresponding depths at the positions of the step S1.
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