CN110778317A - Construction method for ground grouting filling drilling structure in caving zone in mining process - Google Patents
Construction method for ground grouting filling drilling structure in caving zone in mining process Download PDFInfo
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- CN110778317A CN110778317A CN201911103042.7A CN201911103042A CN110778317A CN 110778317 A CN110778317 A CN 110778317A CN 201911103042 A CN201911103042 A CN 201911103042A CN 110778317 A CN110778317 A CN 110778317A
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- grouting filling
- drilling
- hole
- grouting
- construction method
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- 238000005553 drilling Methods 0.000 title claims abstract description 53
- 238000005065 mining Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 26
- 239000007787 solid Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 230000002688 persistence Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 10
- 239000011435 rock Substances 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention discloses a construction method for a ground grouting filling drilling structure in a caving zone in a mining process, which comprises the following steps: a. two groups of grouting filling drill holes are arranged on the overlying ground surface outside the mining boundary of the coal face, and the hole body structure is a three-opening structure and is drilled twice; drilling a first open hole and a second open hole for the first time, wherein the bottom of the first open hole is positioned 5m below the unconsolidated formation, a first open solid pipe is put down, the bottom of the second open hole is positioned 10m below the main key formation, a second open solid pipe is put down to protect the wall, and cement is adopted for cementing the whole section; b. according to the coal mining process, stoping the coal face, when the grouting filling drilling lags behind the working face by a preset distance, drilling a third open hole to a position 10m below the main key layer, and then turning to the side of a goaf to drill to a position below a basic roof; c. and after drilling and forming holes, connecting the grouting pipe with the grouting filling drill hole, and grouting and filling the collapse zone below the crack zone. The invention reduces the construction difficulty of the grouting filling drill hole and increases the persistence time of the grouting filling drill hole.
Description
Technical Field
The invention belongs to the technical field of mining, and particularly relates to a construction method for a caving zone ground grouting filling drilling structure in a mining process, which is suitable for drilling grouting filling drilling holes and performing caving zone grouting in the mining process.
Background
The method is characterized in that slurry is injected into a caving zone of a goaf from the ground through a grouting filling drill hole after coal seam mining, so that the aim of treating various solid wastes such as coal gangue, fly ash and slag is fulfilled, however, after coal seam mining, the original stress balance state around the goaf is damaged, and the stress is redistributed, so that the deformation, the damage and the movement of a rock stratum are caused, and then a large amount of vertical fracture cracks and transverse interlayer cracks are generated, so that the construction difficulty of the ground grouting filling drill hole is obviously increased; meanwhile, in a certain period, the stope overlying strata is in an uninterrupted migration state, so that the stability of a drilling structure is influenced, the retention time of a grouting filling drilling hole is shortened, and the filling amount of slurry is influenced. Therefore, a construction method for grouting, filling and drilling the structure on the inner ground of the caving zone in the mining process is needed.
Disclosure of Invention
The invention aims to provide a construction method for a ground grouting filling drilling structure in a caving zone in a mining process, so as to achieve the purposes of reducing the difficulty of grouting filling drilling construction and increasing the retention time of grouting filling drilling.
The invention is realized by adopting the following technical scheme:
a construction method for a ground grouting filling drilling structure in a caving zone in a mining process comprises the following steps:
a. arranging two groups of grouting filling drill holes on the overlying ground surface outside the mining boundary of the coal face according to requirements, wherein the hole body structure of each grouting filling drill hole is a three-opening structure and drilling is carried out twice; drilling a first open hole and a second open hole for the first time, wherein the bottom of the first open hole is positioned 5m below a unconsolidated formation, a solid open pipe is put down, the whole section is cemented by cement, the bottom of the second open hole is positioned 10m below a main key formation, the wall of the solid open pipe is put down, and the whole section is cemented by cement;
b. according to the coal mining process, stoping the coal face, when the grouting filling drilling lags behind the working face by a preset distance, drilling a third open hole to a position 10m below the main key layer, and then turning to the side of a goaf to drill to a position below a basic roof;
c. and after drilling and forming holes, connecting the grouting pipe with the grouting filling drill hole, and grouting and filling the collapse zone below the crack zone.
The further improvement of the invention is that the grouting filling drill hole is positioned 20-50 m outside the mining boundary of the coal face.
The invention is further improved in that the row pitch of the grouting filling drill hole is the diffusion radius of the slurry.
The invention is further improved in that the distance of the working face after the grouting filling drilling is three cycles of pressure steps.
The invention is further improved in that a solid tube adopts a spiral tube.
The invention has the further improvement that the second open solid pipe adopts a seamless steel pipe.
The invention has at least the following beneficial technical effects:
according to the construction method for the ground grouting filling drilling structure in the caving zone in the mining process, the ground grouting filling drilling hole is arranged outside the mining influence range of a stope, so that the grouting filling drilling hole is prevented from being drilled in a broken rock stratum, the construction difficulty of the ground grouting filling drilling hole is reduced, the retention time of the grouting filling drilling hole is greatly prolonged, and the filling grouting amount is enhanced. The method has the advantages of low implementation difficulty and low construction cost, has good reference value for on-site ground drilling, and can effectively solve the problems of difficult on-site drilling and incapability of keeping the drilled hole.
Drawings
FIG. 1 is a schematic plan view of an overburden grouting fill borehole outside a mining boundary of a coal face in accordance with the present invention;
FIG. 2 is a schematic cross-sectional view A-A of an overlying surface grouting filled borehole outside the mining boundary of a coal face in accordance with the present invention;
description of reference numerals:
1-coal face, 2-grouting filling drill hole, 3-mining boundary, 4-caving zone, 5-three open bare hole, 6-grouting pipe, 7-basic roof, 8-main key layer, 9-loose layer, 10-one open solid pipe, 11-two open solid pipes, 12-fracture zone, 13-earth surface, a-lag face preset distance, b-grouting filling drill hole row distance, c-drill hole distance from mining boundary.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
As shown in fig. 1 and 2, the construction method of the ground grouting filling drilling structure in the caving zone in the mining process provided by the invention comprises the following steps:
a. arranging two groups of grouting filling drill holes 2 on the overlying ground surface 13 outside the mining boundary 3 of the coal face 1 according to requirements, wherein the hole body structure of each grouting filling drill hole 2 is a three-opening structure, and drilling is carried out twice; drilling a first opening and a second opening for the first time, wherein the bottom of the first opening is positioned 5m below a loose layer 9, a first open solid pipe 10 (adopting a spiral pipe) is lowered, cement is adopted for well cementation in the whole section, the bottom of the second opening is positioned 10m below a main key layer 8, a second open solid pipe 11 (adopting a seamless steel pipe) is lowered for wall protection, and cement is adopted for well cementation in the whole section;
b. according to the coal face 1 of the stoping process, when the grouting filling drill hole 2 lags behind the working face by a preset distance a, drilling a third open hole 5 to a position 10m below a main key layer 8, and then turning and drilling towards the side of a goaf until the position below a basic roof 7;
c. and after drilling and pore-forming, connecting the grouting pipe 6 with the grouting filling drill hole 2, and grouting and filling the collapse zone 4 below the crack zone 12.
Examples
The buried depth of a coal seam on a certain mining working surface in an inner Mongolia region is 350-400 m, the average thickness of the coal seam is 19.6m, a collapsed rock stratum is 41m, a fracture zone 12 develops to the ground surface 13, the maximum subsidence of the ground surface 13 reaches 12m, the average period pressure step distance is 20m, the depth of a grouting filling drill hole 2 is about 350m, and the slurry diffusion radius is about 130 m.
1. Arranging two groups of grouting filling drill holes on the overlying ground surface 13 outside the mining boundary 3 of the coal face 1, wherein the first group is positioned on the left side of the overlying ground surface 13 outside the mining boundary 3 of the coal face 1 and is 30m away from the mining boundary 3, the row spacing b of the grouting filling drill holes is 130m, the first grouting filling drill hole 2 is 65m away from the cut hole, the second group is positioned on the right side of the overlying ground surface 13 outside the mining boundary 3 of the coal face 1, the distance c of the drill hole from the mining boundary is 30m, the row spacing b of the grouting filling drill holes is 130m, and the first grouting filling drill hole 2 is 65m away from the cut hole; the hole body structure of the grouting filling drilling hole 2 is a three-opening structure, and a first opening and a second opening are drilled for the first time; according to a geological histogram of an overlying rock stratum of a coal face 1 and a key layer theory, determining the thickness of a unconsolidated formation 9 and the positions of a basic roof 7 and a main key layer 8, drilling to a position 5m below the unconsolidated formation 9 by a first drill, and lowering a solid-open pipe (adopting a spiral pipe); and (4) drilling the second opening to a position 10m below the main key layer 8, and lowering the second opening solid pipe (adopting a seamless steel pipe).
2. And (3) stoping the coal face 1 according to a fully mechanized caving mining mode, when the stoping distance of the coal face 1 to the grouting filling drill hole 2 is 60m, starting to drill for the second time, and drilling a third open hole 5, wherein the third open hole is drilled to a position 10m below a main key layer 8, then drilling an inclined hole to the side of the goaf according to the position of the basic roof 7 and the position of the grouting filling drill hole 2, and the distance of the final hole position to the lower side of the basic roof 7 is 10 m.
3. And connecting the grouting pipe 6 with the grouting filling drill hole 2, and grouting filling the collapse zone 4 below the crack zone 12.
Claims (6)
1. A construction method for a ground grouting filling drilling structure in a caving zone in a mining process is characterized by comprising the following steps:
a. two groups of grouting filling drill holes (2) are arranged on an overlying ground surface (13) outside a mining boundary (3) of a coal face (1) according to requirements, and the hole body structure of each grouting filling drill hole (2) is a three-opening structure and is drilled twice; drilling a first opening and a second opening for the first time, wherein the bottom of the first opening is positioned 5m below a loose layer (9), a first open solid pipe (10) is put down, cement is adopted for well cementation in the whole section, the bottom of the second opening is positioned 10m below a main key layer (8), a second open solid pipe (11) is put down for wall protection, and cement is adopted for well cementation in the whole section;
b. according to the coal face (1) of the stoping process, when the grouting filling drill hole (2) lags behind the face by a preset distance, drilling a third open-hole (5) to a position 10m below a main key layer (8), and then turning to the side of a goaf to drill to a position below a basic roof (7);
c. and after drilling and pore-forming, connecting the grouting pipe (6) with the grouting filling drill hole (2), and performing grouting filling on the collapse zone (4) below the crack zone (12).
2. The construction method of the ground grouting filling drilling structure in the caving zone in the mining process according to claim 1, wherein the grouting filling drilling hole (2) is located 20-50 m away from the mining boundary (3) of the coal face (1).
3. The construction method of the ground grouting filling drilling structure in the caving zone in the mining process according to claim 1, characterized in that the row pitch of the grouting filling drilling (2) is the diffusion radius of the slurry.
4. The construction method of the ground grouting filling drilling structure in the caving zone in the mining process according to claim 1, characterized in that the distance between the grouting filling drilling hole (2) and the lagging working face is three periods of pressure steps.
5. The construction method for the ground grouting filling drilling structure in the caving zone in the mining process according to claim 1, characterized in that a solid opening pipe (10) adopts a spiral pipe.
6. The construction method for the ground grouting filling drilling structure in the caving zone in the mining process according to claim 1, wherein the two open solid pipes (11) are seamless steel pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911103042.7A CN110778317A (en) | 2019-11-12 | 2019-11-12 | Construction method for ground grouting filling drilling structure in caving zone in mining process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911103042.7A CN110778317A (en) | 2019-11-12 | 2019-11-12 | Construction method for ground grouting filling drilling structure in caving zone in mining process |
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| CN110778317A true CN110778317A (en) | 2020-02-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111444620A (en) * | 2020-03-30 | 2020-07-24 | 中煤能源研究院有限责任公司 | Method for determining parameters of ortho-position grouting filling drilling |
| CN112879010A (en) * | 2021-01-20 | 2021-06-01 | 天津市华普生产力促进有限公司 | Foundation construction method for municipal engineering |
| CN114370250A (en) * | 2022-01-12 | 2022-04-19 | 山东省煤田地质局第三勘探队 | Goaf disaster management method based on stratum exploration |
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| CN106703692A (en) * | 2016-12-02 | 2017-05-24 | 淮北矿业股份有限公司 | Method using surface orientation bedding drilling grouting to reinforce laminar limestone |
| CN107313745A (en) * | 2017-07-18 | 2017-11-03 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf |
| US20190078343A1 (en) * | 2015-07-22 | 2019-03-14 | YOOGU E&C Co., Ltd | Grouting apparatus |
| CN109854297A (en) * | 2019-02-22 | 2019-06-07 | 中煤科工集团西安研究院有限公司 | A kind of coalfield mined-out Areas grouting method based on directional drilling technique |
| CN109899089A (en) * | 2019-03-07 | 2019-06-18 | 中煤科工集团西安研究院有限公司 | Goaf grouting method based on pinniform horizontal branch directional drilling technique |
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2019
- 2019-11-12 CN CN201911103042.7A patent/CN110778317A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20190078343A1 (en) * | 2015-07-22 | 2019-03-14 | YOOGU E&C Co., Ltd | Grouting apparatus |
| CN106703692A (en) * | 2016-12-02 | 2017-05-24 | 淮北矿业股份有限公司 | Method using surface orientation bedding drilling grouting to reinforce laminar limestone |
| CN107313745A (en) * | 2017-07-18 | 2017-11-03 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf |
| CN109854297A (en) * | 2019-02-22 | 2019-06-07 | 中煤科工集团西安研究院有限公司 | A kind of coalfield mined-out Areas grouting method based on directional drilling technique |
| CN109899089A (en) * | 2019-03-07 | 2019-06-18 | 中煤科工集团西安研究院有限公司 | Goaf grouting method based on pinniform horizontal branch directional drilling technique |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111444620A (en) * | 2020-03-30 | 2020-07-24 | 中煤能源研究院有限责任公司 | Method for determining parameters of ortho-position grouting filling drilling |
| CN111444620B (en) * | 2020-03-30 | 2023-02-28 | 中煤能源研究院有限责任公司 | Method for determining drilling parameters of adjacent grouting filling |
| CN112879010A (en) * | 2021-01-20 | 2021-06-01 | 天津市华普生产力促进有限公司 | Foundation construction method for municipal engineering |
| CN114370250A (en) * | 2022-01-12 | 2022-04-19 | 山东省煤田地质局第三勘探队 | Goaf disaster management method based on stratum exploration |
| CN114370250B (en) * | 2022-01-12 | 2023-05-05 | 山东省煤田地质局第三勘探队 | Goaf disaster management method based on stratum exploration |
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Application publication date: 20200211 |
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