CN115478893A - Grouting filling method for gob and separation layer of fully mechanized coal mining face - Google Patents
Grouting filling method for gob and separation layer of fully mechanized coal mining face Download PDFInfo
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- CN115478893A CN115478893A CN202211399629.9A CN202211399629A CN115478893A CN 115478893 A CN115478893 A CN 115478893A CN 202211399629 A CN202211399629 A CN 202211399629A CN 115478893 A CN115478893 A CN 115478893A
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- grouting
- pipeline
- goaf
- separation layer
- fully mechanized
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- 238000005065 mining Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000000926 separation method Methods 0.000 title claims abstract description 32
- 239000003245 coal Substances 0.000 title claims description 22
- 230000032798 delamination Effects 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 239000011440 grout Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 3
- 230000006578 abscission Effects 0.000 claims 2
- 238000005429 filling process Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a grouting filling method for a gob and a separation layer of a fully mechanized mining working surface, which comprises the following grouting steps during grouting: a, injecting large-particle paste into a goaf along a first grouting pipeline by using self weight to form a filling body; b, injecting the large-particle paste into the goaf along a second grouting pipeline by using self weight, and simultaneously injecting the slurry into the goaf in a first grouting pipeline by using grouting pressure until a top plate fracture zone is full; c, injecting clear water into the first grouting pipeline, cleaning the grouting pipeline, increasing the grouting pressure of the first grouting pipeline, and injecting grout into the delamination zone until the delamination zone is full; and repeating the grouting steps for the subsequent grouting pipeline along with the advancing of the working surface. The method can sequentially complete grouting of the separation layer while grouting the goaf, and the pipes are sequentially carried out, so that a set of ordered filling process is formed.
Description
Technical Field
The invention belongs to the technical field of coal mine grouting filling, and particularly relates to a grouting filling method for a goaf and a separation layer of a fully mechanized coal mining face.
Background
In recent years, mine exploitation of a fully mechanized mining face is more and more common, but a filling process of the working face is stricter, and a corresponding filling process is not matched with the filling process, so that the production efficiency of the working face is influenced. Under the large background of protecting ecological environment and ground building, the filling requirements of mines are becoming higher and higher. On the premise of ensuring safe production, the filling effect is more and more severe. This further results in an increasingly difficult and costly filling process.
Moreover, the gap of the separation zone is not considered in the filling process of the fully mechanized mining face at present, and the separation zone gradually sinks along with the lapse of time. The traditional fully mechanized coal mining face filling process has great influence on normal production of a fully mechanized coal mining operation area, so that the coal production efficiency is reduced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a grouting filling method for a gob and a separation layer of a fully mechanized coal mining face.
A grouting filling method for a gob and a separation layer of a fully mechanized coal mining face comprises the steps of determining the distance from a coal seam roof to the ground surface and the damage range of the separation layer before a grouting pipeline is arranged;
b, from the hole cutting position, the working face is pushed by L meters for the first time, a hole is drilled from the ground to a goaf top plate at a distance of R meters from the hole cutting position, a grouting pipeline is arranged, and the distance of a single row of drilled holes is 2R; drilling holes from the ground to arrange grouting pipelines when the subsequent working surface is pushed by 2R meters;
l is a safety distance, wherein L is the distance between the cutting hole and the fully mechanized mining operation area, or the distance between a filling surface which is filled by grouting and the fully mechanized mining operation area; r is grouting radius, and S is grouting diffusion influence distance; where 2R + S + VT is less than or equal to L, V is the mining speed of the working face, and T is the mining time. (ii) a
A plurality of grouting holes are formed in the grouting pipeline arranged in the drill hole at positions corresponding to the delamination tape;
when grouting, the method comprises the following grouting steps: a, injecting large-particle paste into a goaf along a first grouting pipeline by using self weight to form a filling body; b, injecting the large-particle paste into the goaf along a second grouting pipeline by using self weight, and simultaneously injecting the slurry into the goaf in a first grouting pipeline by using grouting pressure until a top plate fracture zone is full; c, injecting clear water into the first grouting pipeline, cleaning the grouting pipeline, increasing the grouting pressure of the first grouting pipeline, and injecting grout into the delamination zone until the delamination zone is full; and repeating the grouting steps for the subsequent grouting pipeline along with the advancing of the working surface.
Further, the damage range of the separation layer is determined by a microseismic method or a drilling method.
Furthermore, the length of the grouting pipeline is determined according to the distance from the top plate to the ground surface, and the range of a grout outlet of the grouting pipeline is determined by the range of the delamination damage.
Furthermore, the distance between a grouting pipeline and a fully mechanized mining operation area needs to be ensured to be L meters in the grouting and working face mining processes.
Further, the grouting radius R is proportional to the drilling depth, goaf height and grouting pressure, and inversely proportional to the drilling angle.
Furthermore, a plurality of grouting holes arranged at the positions of the grouting pipeline corresponding to the separation zone are uniformly distributed along the pipe wall of the grouting pipeline.
Furthermore, the particle size of the large-particle paste is below 15mm and is determined by the size of the goaf.
Further, the grouting pressure is 0.5MPa to 3MPa.
The method utilizes the goaf grouting pipeline to simultaneously complete grouting on the separation layer, and one set of grouting device completes grouting processes of two areas, thereby reducing the influence of grouting filling operation on normal production of the fully mechanized coal mining working area to the maximum extent, ensuring the production efficiency of coal, and saving the production cost and time cost.
Drawings
Fig. 1 is a schematic diagram of a grouting filling method for a gob and a separation layer of a fully mechanized mining working face.
Detailed Description
In order to solve the technical problems in the prior art, the invention provides a grouting filling method for collecting a gob and a separation layer of a fully mechanized coal mining face. The invention will now be described with reference to figure 1.
A grouting filling method for a gob and a separation layer of a fully mechanized mining working face comprises the steps of determining the distance from a coal seam roof to the ground surface and the damage range of the separation layer before grouting pipelines are arranged so as to facilitate the subsequent grouting pipelines;
from the hole cutting position, the working face is pushed for the first time by L meters, holes are drilled from the ground to a goaf top plate at a distance of R meters from the hole cutting position, grouting pipelines are arranged, and the distance of a single row of drilling holes is 2R, so that grouting slurry can cover the whole area; drilling holes from the ground to arrange grouting pipelines every 2R meters of the subsequent working surface;
l is a safety distance, wherein L is the distance between the cutting hole and the fully mechanized mining operation area, or the distance between a filling surface which is filled by grouting and the fully mechanized mining operation area; r is grouting radius, and S is grouting diffusion influence distance; where 2R + S + VT is less than or equal to L, V is the mining speed of the working face, and T is the mining time. (ii) a
A plurality of grouting holes are formed in the grouting pipeline arranged in the drill hole at positions corresponding to the delamination tape;
when grouting, the method comprises the following grouting steps: a, injecting large-particle paste into a goaf along a first grouting pipeline by using self weight to form a filling body; b, injecting a large-particle paste into the gob by using self weight along a second grouting pipeline, and simultaneously injecting slurry into the gob by using grouting pressure in a first grouting pipeline until a top plate fissure zone is full; c, injecting clear water into the first grouting pipeline, cleaning the grouting pipeline, then increasing the grouting pressure of the first grouting pipeline, and injecting grout into the delamination zone until the delamination zone is full; and repeating the grouting steps for the subsequent grouting pipeline along with the advancing of the working surface. Because the clearance of the separation zone is likely to be smaller, the grouting pressure needs to be increased so that the separation zone can be filled after the slurry is filled in the goaf, and when the slurry cannot be filled any more after the grouting pressure reaches a certain value, the separation zone is filled with the slurry.
Wherein the damage range of the separation layer is determined by a microseismic method or a drilling method. The length of the grouting pipeline is determined according to the distance from the top plate to the ground surface, and the range of a grout outlet of the grouting pipeline is determined by the damage range of the separation layer, so that grouting can be conveniently carried out on the separation layer zone.
The distance between a grouting pipeline and a fully mechanized mining operation area needs to be ensured to be L meters in the grouting and working face mining processes, so that on one hand, a roof is prevented from caving in through initial pressure, on the other hand, the coal mining space and the grouting filling space are relatively separated, and the influence on coal production is reduced to the maximum extent. The grouting radius R is directly proportional to the drilling depth, the goaf height and the grouting pressure and inversely proportional to the drilling angle. And a plurality of grouting holes arranged at the positions of the grouting pipeline corresponding to the delamination tape are uniformly distributed along the pipe wall of the grouting pipeline. The particle size of the large particle paste is below 15mm and is determined by the size of the goaf. The grouting pressure is 0.5MPa to 3MPa.
The method utilizes the goaf grouting pipeline to simultaneously complete grouting on the separation layer, and one set of grouting device completes grouting processes of two areas, thereby reducing the influence of grouting filling operation on normal production of the fully mechanized coal mining working area to the maximum extent, ensuring the production efficiency of coal, and saving the production cost and time cost.
Claims (8)
1. A grouting filling method for a gob and a separation layer of a fully mechanized mining working face is characterized by comprising the steps of determining the distance from a coal seam roof to the ground surface and the damage range of the separation layer before arranging a grouting pipeline;
from the hole cutting position, the working face is pushed for the first time by L meters, holes are drilled from the ground to a goaf top plate at a position R meters away from the hole cutting position, grouting pipelines are arranged, and the distance of single-row drilling is 2R; drilling holes from the ground to arrange grouting pipelines every 2R meters of the subsequent working surface;
l is a safety distance, wherein L is a distance between the cutting eye and the fully mechanized mining operation area, or a distance between a filling surface which is filled by grouting and the fully mechanized mining operation area; r is grouting radius, and S is grouting diffusion influence distance; wherein 2R + S + VT is less than or equal to L, V is the mining speed of the working face, and T is the mining time;
a plurality of grouting holes are formed in the grouting pipeline arranged in the drill hole at positions corresponding to the delamination tape;
when grouting, the method comprises the following grouting steps: a, injecting large-particle paste into a goaf along a first grouting pipeline by using self weight to form a filling body; b, injecting the large-particle paste into the goaf along a second grouting pipeline by using self weight, and simultaneously injecting the slurry into the goaf in a first grouting pipeline by using grouting pressure until a top plate fracture zone is full; c, injecting clear water into the first grouting pipeline, cleaning the grouting pipeline, increasing the grouting pressure of the first grouting pipeline, and injecting grout into the delamination zone until the delamination zone is full; and repeating the grouting steps for the subsequent grouting pipeline along with the advancing of the working surface.
2. The grouting filling method for the goaf and the separation layer of the fully mechanized mining face according to claim 1, wherein the damage range of the separation layer is determined by a microseismic method or a drilling method.
3. The grouting filling method for the goaf and the abscission of the fully mechanized coal mining face according to claim 1, wherein the length of a grouting pipeline is determined according to the distance from a top plate to the ground surface, and the range of a grout outlet of the grouting pipeline is determined by the damage range of the abscission.
4. The grouting filling method for the goaf and the separation layer of the fully mechanized mining face according to claim 1, wherein the distance between a grouting pipeline and the fully mechanized mining area is ensured to be L meters in the grouting and face mining processes.
5. The method as claimed in claim 1, wherein the radius of grouting R is proportional to the depth of the drilled hole, the height of the gob and the grouting pressure and inversely proportional to the angle of the drilled hole.
6. The grouting filling method for the goaf and the separation layer of the fully mechanized coal mining face according to claim 3, wherein a plurality of grouting holes are uniformly arranged along the pipe wall of the grouting pipe at positions where the grouting pipes correspond to the separation layer zone.
7. The method for filling the goaf and the separation layer of the fully mechanized coal mining face according to claim 1, wherein the particle size of the large granular paste is below 15mm and is determined by the size of the goaf.
8. The method as claimed in claim 1, wherein the grouting pressure is 0.5MPa to 3MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211399629.9A CN115478893A (en) | 2022-11-09 | 2022-11-09 | Grouting filling method for gob and separation layer of fully mechanized coal mining face |
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|---|---|---|---|
| CN202211399629.9A CN115478893A (en) | 2022-11-09 | 2022-11-09 | Grouting filling method for gob and separation layer of fully mechanized coal mining face |
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| CN115478893A true CN115478893A (en) | 2022-12-16 |
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| CN202211399629.9A Pending CN115478893A (en) | 2022-11-09 | 2022-11-09 | Grouting filling method for gob and separation layer of fully mechanized coal mining face |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118292885A (en) * | 2024-06-05 | 2024-07-05 | 山西鸿太旭飞建设有限公司 | Mining method for preventing earth surface subsidence by mining underground resources without coal pillars |
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2022
- 2022-11-09 CN CN202211399629.9A patent/CN115478893A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118292885A (en) * | 2024-06-05 | 2024-07-05 | 山西鸿太旭飞建设有限公司 | Mining method for preventing earth surface subsidence by mining underground resources without coal pillars |
| CN118292885B (en) * | 2024-06-05 | 2024-08-09 | 山西鸿太旭飞建设有限公司 | Mining method for preventing earth surface subsidence by mining underground resources without coal pillars |
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