CN114607378B - Coal-based solid waste overlying strata isolation grouting filling water-retention coal mining method - Google Patents
Coal-based solid waste overlying strata isolation grouting filling water-retention coal mining method Download PDFInfo
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- CN114607378B CN114607378B CN202210309982.7A CN202210309982A CN114607378B CN 114607378 B CN114607378 B CN 114607378B CN 202210309982 A CN202210309982 A CN 202210309982A CN 114607378 B CN114607378 B CN 114607378B
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- 238000005065 mining Methods 0.000 title claims abstract description 55
- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000002955 isolation Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002910 solid waste Substances 0.000 title claims abstract description 11
- 206010016807 Fluid retention Diseases 0.000 title abstract description 16
- 239000011435 rock Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000005056 compaction Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims 2
- 239000003250 coal slurry Substances 0.000 claims 1
- 206010017076 Fracture Diseases 0.000 description 28
- 208000010392 Bone Fractures Diseases 0.000 description 20
- 239000002002 slurry Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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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
-
- 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
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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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)
- Remote Sensing (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a coal-based solid waste overlying strata isolation grouting filling water-retention coal mining method, which creatively provides a condition that a water-retention layer below a shallow water-bearing stratum during mining of a shallow coal seam is thinner (or has no water-bearing stratum) and a rock stratum fracture develops and a mining fracture zone does not affect the shallow water-bearing stratum but water leaks downwards.
Description
Technical Field
The invention relates to the field of coal mine water retention mining, in particular to a coal-based solid waste overlying strata isolation grouting filling water retention coal mining method.
Background
Water retention coal mining is an important component of a coal mine green mining technology system, and the requirements on water retention mining are extremely urgent in arid and semiarid mining areas in the west of China. Because the buried depth of the coal seam in the western mining area is relatively shallow, and the stratum generally lacks a water-resisting layer. The mining practice finds that although the mining water-flowing fractured zone top boundary is far away from the shallow aquifer, a part of water in the aquifer is lost into the working face. This is because the formation fractures in the area are developed, the overburden permeability is obviously increased after the production disturbance, and in addition, the stratum lacks a water-resisting layer, so that shallow water is leaked to the working face. If not protect water exploitation, along with exploitation intensity increase, exploitation time extension, the water of shallow aquifer can run off gradually totally, causes the influence to regional environment and ecology.
The overlying strata isolation grouting filling technology is used as an important method for 'three-down' coal mining, and provides a new way for coal mine enterprises to solve the problem of coal pressing mining. The basic principle of the technology is that overburden mining fractures below a key layer are selected, multiple groups of ground drilling holes reaching the mining fractures are constructed, high-pressure grouting filling is conducted on a fracture cavity through the ground drilling holes in the working face stoping process, the grouting pressure can generate compression effect on broken rock masses in a lower goaf, a compaction supporting area is formed in the middle of the goaf, isolation coal pillars with certain width reserved between the compaction area and the working face jointly bear overburden rock layers, rock layer breakage is prevented, surface subsidence is effectively controlled, and ground building structures are protected. The method is expected to be applied to water retention exploitation, but when water retention is implemented for a fracture development stratum, not only is the mining-induced fracture of the stratum prevented, but also the water of a shallow aquifer is prevented from leaking to a lower working face along the original fracture of the stratum. Therefore, a new overburden rock isolation grouting filling water-retention coal mining method is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a coal-based solid waste overlying strata isolation grouting filling water-retention coal mining method which is suitable for shallow coal seam mining and under the condition that a water-resisting layer below a shallow water-bearing layer is thin or no water-resisting layer exists and simultaneously a lower rock stratum fracture develops, and the method comprises the following steps:
s1, arranging a plurality of adjacent stope faces in a mining area;
s2, selecting a rock stratum with a horizontal fracture developed on the top of the bedrock, constructing a plurality of vertical filling drill holes on the earth surface above each working surface at intervals along the advancing direction of the working surfaces, and constructing final holes of the filling drill holes to the rock stratum with the horizontal fracture developed;
s3, injecting high-concentration clay slurry into the rock stratum with the horizontal fracture developed from the filling drill hole to form an artificial water-resisting layer;
s4, determining the position of a key layer in the overlying strata and the range of a water-flowing fractured zone based on the lithology and the thickness of the strata, reserving an isolation layer with a certain thickness above the water-flowing fractured zone, and selecting a certain key layer above the isolation layer as a grouting key layer; the bottom surface of the rock stratum of the grouting key layer and the top surface of the rock stratum below the grouting key layer form a mining-induced fracture space for grouting filling in the working face mining process;
s5, extending and filling the drilled hole, and extending a final hole of the drilled hole to a mining fracture space;
and S6, sequentially mining each working face and performing grouting filling until all the working faces are mined, forming a compaction area in each working face, effectively supporting the overlying strata, preventing mining-induced cracks from occurring in the strata, preventing the artificial water-resisting layer from being damaged by mining, eliminating a channel through which shallow water is leaked downwards, and achieving a water-retaining effect.
Preferably, the coal-based solid waste slurry such as fly ash slurry or gangue powder slurry is injected into the mining-induced fracture space.
The invention has the advantages that: aiming at the problem of shallow aquifer leakage under the combined action of primary fracture development and exploitation disturbance in a shallow buried stratum, the overlying strata isolation grouting and rock filling control technology and the shallow aquifer protection technology are creatively integrated, mutually supplemented and unsegmentable. Specifically, before overburden rock isolation grouting filling exploitation, selecting a rock stratum with a certain crack developing at the top of a bedrock below a water-bearing stratum, injecting high-concentration clay slurry into the crack of the rock stratum from a filling drill hole to form an artificial water-resisting stratum, and blocking a channel through which a shallow water-bearing stratum leaks downwards along the original crack of the rock stratum; in the process of overburden rock isolation grouting filling exploitation, an overburden rock and an artificial water-resisting layer are supported through a grouting filling compaction area, so that the formation is prevented from generating mining-induced fractures, the artificial water-resisting layer is prevented from being damaged by mining, primary fractures and mining-induced fracture channels of downward leakage of shallow water are eliminated, and the shallow water-bearing layer water leakage caused by exploitation disturbance is prevented under the condition of double pipes, so that the water retention effect is achieved.
Drawings
FIG. 1 is a schematic diagram of a coal mining method of the invention by isolating, grouting, filling and water retention of coal-based solid waste overlying strata.
In the figure: the method comprises the following steps of working face 1, coal pillar 11, key layer 2, grouting key layer 21, unconsolidated layer 3, rock stratum/artificial water-resisting layer 4 for horizontal fracture development, filling drill hole 5 and mining fracture space/filling body 6.
Detailed Description
The technical solution of the present invention is described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
A coal-based solid waste overlying strata isolation grouting filling water retention coal mining method is suitable for shallow coal seam mining, and the condition that a water-resisting layer below a shallow water-bearing layer is thin or no water-resisting layer exists and simultaneously a lower rock stratum fracture develops comprises the following steps:
s1, arranging a plurality of adjacent stope faces 1 in a mining area; isolation coal pillars 11 can be left between the stope faces.
S2, selecting a rock stratum 4 with horizontal fractures at the top of the bedrock, constructing a plurality of vertical filling drill holes 5 on the earth surface above each working surface at intervals along the advancing direction of the working surface, and constructing final holes of the filling drill holes 5 to the rock stratum 4 with the horizontal fractures;
s3, injecting high-concentration clay slurry into the rock stratum 4 with the horizontal fracture developed from the filling drill hole 5 to form an artificial water-resisting layer 4;
s4, determining the position of a key layer 2 in the overburden rock and the range of a water flowing fractured zone based on the lithology and the thickness of the stratum, reserving an isolation layer with a certain thickness above the water flowing fractured zone, and selecting a certain key layer 2 above the isolation layer as a grouting key layer 21; the bottom surface of the rock stratum of the grouting key layer 21 and the top surface of the rock stratum below the grouting key layer form a mining-induced fracture space 6 for grouting filling in the working face mining process;
s5, extending and filling the drill hole 5, and extending a final hole of the drill hole to a mining fracture space 6;
s6, mining each working face in sequence, grouting and filling, injecting coal-based solid waste slurry such as fly ash slurry or gangue powder slurry into the mining fracture space 6 until all the working faces are mined, forming a compaction area in each working face, effectively supporting an overlying rock stratum, preventing mining fractures from occurring in the rock stratum, preventing an artificial water-resisting layer from being damaged by mining, eliminating a channel through which shallow water leaks downwards, and achieving a water retention effect.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (2)
1. A coal-based solid waste overlying rock isolation grouting filling water retention coal mining method is suitable for shallow coal seam mining, and a water barrier layer below a shallow water-bearing layer is thin or has no water barrier layer and the fracture of a lower rock stratum develops at the same time, the shallow water-bearing layer is a water-bearing layer in a loose layer, and the method is characterized by comprising the following steps of:
s1, arranging a plurality of adjacent stope faces in a mining area, and reserving isolation coal pillars between the stope faces;
s2, selecting a rock stratum with horizontal fractures at the top of the bedrock, constructing a plurality of vertical filling drill holes on the earth surface above each working surface at intervals along the advancing direction of the working surface, and constructing the final holes of the filling drill holes to the rock stratum with the horizontal fractures;
s3, injecting high-concentration clay slurry into the rock stratum with the horizontal fracture developed from the filling drill hole to form an artificial water-resisting layer;
s4, determining the position of a key layer and the range of a water flowing fractured zone in the overburden rock based on the lithology and the thickness of the stratum, reserving an isolation layer with a certain thickness above the water flowing fractured zone, and selecting a certain key layer above the isolation layer as a grouting key layer; the bottom surface of the rock stratum of the grouting key layer and the top surface of the rock stratum below the grouting key layer form a mining-induced fracture space for grouting filling in the working face mining process;
s5, extending the filling drill hole, and extending the final hole to the grouting key layer determined in the step S4;
and S6, sequentially mining each working face and performing grouting filling until all the working faces are mined, forming a compaction area in each working face, effectively supporting the overlying strata, preventing mining-induced cracks from occurring in the strata, preventing the artificial water-resisting layer from being damaged by mining, eliminating a channel through which shallow water is leaked downwards, and achieving a water-retaining effect.
2. The coal mining method of claim 1, wherein the coal-based solid waste overlying strata is filled with water and coal slurry in the mining-induced fracture space.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210309982.7A CN114607378B (en) | 2022-03-28 | 2022-03-28 | Coal-based solid waste overlying strata isolation grouting filling water-retention coal mining method |
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| CN202210309982.7A CN114607378B (en) | 2022-03-28 | 2022-03-28 | Coal-based solid waste overlying strata isolation grouting filling water-retention coal mining method |
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| CN114607378B true CN114607378B (en) | 2023-04-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100467829C (en) * | 2006-11-17 | 2009-03-11 | 中国矿业大学 | Water-protection coal-mining method using structural key layer as waterproof layer |
| CN102704933B (en) * | 2012-05-25 | 2014-10-29 | 中国矿业大学 | Isolated-section grouting filling coal-mining method for mining overburden rock |
| CN206174997U (en) * | 2016-10-25 | 2017-05-17 | 淮北工业建筑设计院有限责任公司 | It moves towards subregion and keeps apart slip casting and fill structure to adopt overlying strata |
| CN106593445A (en) * | 2016-12-02 | 2017-04-26 | 淮北矿业（集团）有限责任公司 | Old goaf underlying close distance coal seam strata-overlying isolation grouting filling exploitation method |
| CN110630211B (en) * | 2018-08-31 | 2021-08-17 | 中国矿业大学 | Method for blocking overburden mining-induced fracture by ultrasonic in-situ slurry making |
| CN109611146B (en) * | 2018-11-29 | 2020-10-13 | 山东科技大学 | Separation layer water drainage grouting method |
| CN112096380B (en) * | 2020-01-17 | 2022-05-17 | 中国矿业大学(北京) | High-strength mining rock stratum migration grouting control and grouting amount calculation method |
| CN113175325B (en) * | 2021-04-25 | 2022-03-08 | 中国矿业大学 | Coal and intergrown sandstone type uranium ore coordinated mining method based on key layer protection |
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