CN113803087B - Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method - Google Patents
Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method Download PDFInfo
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- CN113803087B CN113803087B CN202111045026.4A CN202111045026A CN113803087B CN 113803087 B CN113803087 B CN 113803087B CN 202111045026 A CN202111045026 A CN 202111045026A CN 113803087 B CN113803087 B CN 113803087B
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- 239000003245 coal Substances 0.000 claims abstract description 46
- 239000011435 rock Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims abstract description 18
- 230000002787 reinforcement Effects 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims description 76
- 238000007789 sealing Methods 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 description 5
- 238000005065 mining Methods 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a grouting reinforcement method for broken surrounding rocks of a small coal pillar gob-side entry driving, belongs to the technical field of coal mine construction, and can solve the problems of serious grouting leakage and poor reinforcement effect of the small coal pillar gob-side entry driving.
Description
Technical Field
The invention belongs to the technical field of coal mine construction, and particularly relates to a technical method for reinforcing small coal pillar surrounding rock when the small coal pillar gob-side entry driving coal pillar surrounding rock is broken.
Background
The small coal pillar gob-side entry driving is an important technical method for improving the recovery rate of coal resources and prolonging the service life of mines, and is an important technical method for green mining of the mines. Due to the action of the mining stress of the last working face, surrounding rock of the lateral coal body is crushed, a small coal pillar is left in a stress reduction area along an empty tunneling roadway, but the small coal pillar is poor in coal body integrity and limited in bearing capacity, and large deformation and instability of the roadway are easily caused. The supporting strength is enhanced and the surrounding rock structure is improved, which is a common control technology for the surrounding rock of the small coal pillar, but the surrounding rock deformation of the roadway is difficult to effectively control because the crack of the surrounding rock of the small coal pillar is large and the slurry leakage is serious in the grouting process, so that the grouting reinforcement effect is poor.
Disclosure of Invention
The invention provides a grouting reinforcement method for broken surrounding rocks of a small coal pillar gob-side entry driving, aiming at the problems of serious grouting leakage and poor reinforcement effect of the small coal pillar gob-side entry driving. Can reduce slurry leakage of the gap on the temporary side of the small coal pillar and improve the integrity and strength of surrounding rock of the core bearing area of the small coal pillar.
The invention adopts the following technical scheme:
a grouting reinforcement method for broken surrounding rocks of small coal pillars along an empty roadway comprises the following steps:
firstly, drilling construction is carried out on the side edges of the small coal pillars in a segmented mode, a plurality of deep grouting drilling holes are firstly constructed in the segmented construction process, and shallow grouting drilling holes are constructed in the middle of every two deep grouting holes after the deep grouting drilling holes are constructed, wherein the deep grouting drilling holes and the shallow grouting drilling holes are alternately arranged;
secondly, after the drilling construction is finished, grouting steel pipes are respectively inserted into the deep grouting drilling holes and the shallow grouting drilling holes, and then hole sealing is carried out;
thirdly, grouting construction is carried out after hole sealing is completed, deep grouting drilling is firstly constructed, and shallow grouting drilling is then constructed after deep grouting drilling construction is completed.
Further, the segment height is 30-50m.
Further, the distance between the deep grouting drilling holes is 2-4m.
Further, the depth of the deep grouting drilling hole is 1.5m smaller than the width of the small coal pillar, and the depth of the shallow grouting drilling hole is 2m smaller than the depth of the deep grouting drilling hole.
Further, the hole sealing length of the deep grouting drilling hole is the same as the depth of the shallow grouting drilling hole, the rest is a grouting section, the hole sealing length of the shallow grouting drilling hole is 1.5-2m, and the rest is a grouting section.
Further, the water-cement ratio of the grouting materials of the deep grouting drilling holes is smaller than 0.8:1, and the water-cement ratio of the grouting materials of the shallow grouting drilling holes is 0.8:1-1.2:1.
Further, the grouting pressure of the deep grouting drilling hole is smaller than 2MPa, and the grouting flow is 20L/min.
Further, the grouting pressure of the shallow grouting drilling hole is 3-4 MPa, and the grouting flow is 30L/min.
The beneficial effects of the invention are as follows:
the invention combines deep grouting drilling and shallow grouting drilling to strengthen the broken coal body of the small coal pillar. The open cracks on the adjacent side of the small coal pillar can be plugged after deep drilling and grouting, a slurry stopping layer is formed on the shallow part of the coal wall on the adjacent side, so that slurry is prevented from leaking out of the cracks on the adjacent side, and the grouting effect is prevented from being influenced; the shallow part is drilled and grouting to strengthen the broken coal body in the middle of the small coal pillar, so that the integrality of surrounding rock in the core bearing area in the middle of the small coal pillar can be improved, the bearing capacity of the small coal pillar is improved, the roadway top plate is effectively supported, the deformation of the surrounding rock of the small coal pillar along the goaf tunneling is controlled, and the safe use of the roadway is ensured.
Drawings
FIG. 1 is a schematic vertical cross-section of a grouting borehole arrangement of the present invention;
FIG. 2 is a schematic top view of a grouting borehole arrangement of the present invention;
FIG. 3 is a schematic plan view of a drilling arrangement of the present invention;
wherein: 1-goaf; 2-small coal pillars; 3-grouting and drilling; 4-hole sealing sections; 5-roadway; 6-deep grouting drilling; 7-shallow grouting drilling; 8-top plate; 9-a bottom plate.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in the figure, the grouting reinforcement method for broken surrounding rock of small coal pillar gob-side entry driving comprises the following steps:
firstly, drilling construction is carried out on the side edges of the small coal pillars according to the width of the small coal pillars, and deep grouting drilling is carried out according to the parameters of drilling hole height, interval row distance, diameter and the like, wherein the hole depth is 1.5m smaller than the width of the coal pillars; and then constructing a shallow grouting hole between the two deep grouting drilling holes, wherein the depth of the shallow grouting drilling hole is 2m shorter than that of the deep grouting drilling hole. After the drilling construction is finished, performing insertion pipe and hole sealing construction, inserting a grouting steel pipe into a grouting hole, and then sealing the hole, wherein the hole sealing length of a deep grouting drilling hole is consistent with the depth of a shallow grouting drilling hole, and a grouting section of 2m is reserved; the hole sealing length of the shallow grouting drilling hole is 1.5m-2m, and a grouting section with a certain length is reserved. And (3) grouting construction is carried out after hole sealing is finished, namely deep holes are firstly constructed, and grouting construction of shallow grouting drilling holes between two rows of deep grouting drilling holes can be carried out after the construction of the two rows of deep grouting drilling holes is finished.
Grouting and drilling construction sequence: the shallow grouting drilling holes and the deep grouting drilling holes are arranged in a staggered mode, the deep grouting drilling holes are constructed first, and after grouting is completed, the shallow grouting drilling holes are constructed in a grouting area.
Grouting material characteristics: the deep grouting drilling adopts a double-liquid grouting material with small cement ratio and high solidification speed to plug open cracks on the side of the blank, and the cement ratio is less than 0.8:1; the shallow grouting drilling adopts a biliquid material with relatively large cement ratio, good fluidity and high compressive strength for grouting, the integrity and strength of surrounding rock of a middle core bearing area are improved, and the cement ratio is 0.8:1-1.2:1.
Grouting process: the deep grouting drilling adopts small-flow low-pressure sequential grouting, and the shallow grouting drilling also adopts small-flow grouting, so that grouting pressure can be properly improved, and slurry permeability is ensured.
The grouting pressure of the deep grouting drilling hole is less than 2MPa, and the grouting flow is 20L/min. The grouting pressure of the shallow grouting drilling hole is 3-4 MPa, and the grouting flow is 30L/min.
Claims (7)
1. A grouting reinforcement method for broken surrounding rocks of small coal pillars along an empty roadway is characterized by comprising the following steps: the method comprises the following steps:
firstly, drilling construction is carried out on the side edges of the small coal pillars in a segmented mode, a plurality of deep grouting drilling holes are firstly constructed in the segmented construction process, and shallow grouting drilling holes are constructed in the middle of every two deep grouting holes after the deep grouting drilling holes are constructed, wherein the deep grouting drilling holes and the shallow grouting drilling holes are alternately arranged;
secondly, after the drilling construction is finished, grouting steel pipes are respectively inserted into the deep grouting drilling holes and the shallow grouting drilling holes, and then hole sealing is carried out;
thirdly, grouting construction is carried out after hole sealing is finished, deep grouting drilling is firstly constructed, and shallow grouting drilling is then constructed after the deep grouting drilling is finished;
the depth of the deep grouting drilling hole is 1.5m smaller than the width of the small coal pillar, and the depth of the shallow grouting drilling hole is 2m smaller than the depth of the deep grouting drilling hole.
2. The method for grouting reinforcement of broken surrounding rocks of small coal pillars along goaf roadway driving according to claim 1, which is characterized by comprising the following steps: the segment height is 30-50m.
3. The method for grouting reinforcement of broken surrounding rocks of small coal pillars along goaf roadway driving according to claim 1, which is characterized by comprising the following steps: the distance between the deep grouting holes is 2-4m.
4. The method for grouting reinforcement of broken surrounding rocks of small coal pillars along goaf roadway driving according to claim 1, which is characterized by comprising the following steps: the hole sealing length of the deep grouting drilling hole is the same as the depth of the shallow grouting drilling hole, the rest is a grouting section, the hole sealing length of the shallow grouting drilling hole is 1.5-2m, and the rest is a grouting section.
5. The method for grouting reinforcement of broken surrounding rocks of small coal pillars along goaf roadway driving according to claim 1, which is characterized by comprising the following steps: the water cement ratio of grouting materials of the deep grouting drilling holes is smaller than 0.8:1, and the water cement ratio of grouting materials of the shallow grouting drilling holes is 0.8:1-1.2:1.
6. The method for grouting reinforcement of broken surrounding rocks of small coal pillars along goaf roadway driving according to claim 1, which is characterized by comprising the following steps: the grouting pressure of the deep grouting drilling hole is less than 2MPa, and the grouting flow is 20L/min.
7. The method for grouting reinforcement of broken surrounding rocks of small coal pillars along goaf roadway driving according to claim 1, which is characterized by comprising the following steps: the grouting pressure of the shallow grouting drilling hole is 3-4 MPa, and the grouting flow is 30L/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045026.4A CN113803087B (en) | 2021-09-07 | 2021-09-07 | Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method |
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| CN202111045026.4A CN113803087B (en) | 2021-09-07 | 2021-09-07 | Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method |
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| CN113803087A CN113803087A (en) | 2021-12-17 |
| CN113803087B true CN113803087B (en) | 2023-11-10 |
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| CN114856636A (en) * | 2022-05-18 | 2022-08-05 | 中国电建集团华东勘测设计研究院有限公司 | Low-pressure grouting method for surrounding rock in shallow surface layer of underground cavern roof |
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2021
- 2021-09-07 CN CN202111045026.4A patent/CN113803087B/en active Active
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