CN110118089B - Mining FRP grid-coal gangue-self-compacting concrete regenerated top plate and construction method thereof - Google Patents
Mining FRP grid-coal gangue-self-compacting concrete regenerated top plate and construction method thereof Download PDFInfo
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- CN110118089B CN110118089B CN201910432285.9A CN201910432285A CN110118089B CN 110118089 B CN110118089 B CN 110118089B CN 201910432285 A CN201910432285 A CN 201910432285A CN 110118089 B CN110118089 B CN 110118089B
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- 239000003245 coal Substances 0.000 title claims abstract description 91
- 239000011376 self-consolidating concrete Substances 0.000 title claims abstract description 32
- 238000010276 construction Methods 0.000 title claims abstract description 13
- 238000005065 mining Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008929 regeneration Effects 0.000 claims abstract description 4
- 238000011069 regeneration method Methods 0.000 claims abstract description 4
- 239000011435 rock Substances 0.000 claims description 29
- 239000004568 cement Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims 2
- 239000004575 stone Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 41
- 239000011151 fibre-reinforced plastic Substances 0.000 description 41
- 239000011515 fiberglass reinforced plastic grating Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 gravel Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
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- 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
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- 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
-
- 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
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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
- E21F15/005—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)
- Architecture (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Civil Engineering (AREA)
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Abstract
The invention discloses a mining FRP grid-coal gangue-self-compacting concrete regeneration top plate and a construction method thereof. The method comprises the following steps: laying a first layer of FRP grids along the bottom plate of the goaf after top-layering mining; filling the crushed coal gangue; then laying a second layer of FRP grid; continuously filling coal gangue; after filling, the gap of the coal gangue is filled by adopting self-compacting concrete at one time. The invention has the beneficial effects that: according to the invention, the lightweight high-strength corrosion-resistant FRP grid is adopted, so that the transverse deformation of the coal gangue material can be effectively restrained, the shear strength and the elastic modulus of the coal gangue discrete material are improved, and the self-compacting concrete is used for filling the gaps of the coal gangue discrete material, so that the non-uniform settlement of the discrete aggregate can be effectively inhibited. The construction process is simple, the construction speed is high, and the formed regenerated top plate is good in stability.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a mining FRP grid-coal gangue-self-compacting concrete regenerated roof and a construction method thereof.
Background
When a thick coal seam is exploited in a layered mode, a top plate formed by naturally cementing a rock stratum collapsed in an upper layer for a certain time is called a regenerated top plate. The formation of the regenerated roof includes both compaction and cementing of the fractured rock formation. To reduce the time required for natural cementation, yellow mud or water glass is generally used as the cementing material. To improve the stability of the regenerated roof, a layer of metal or plastic mesh is usually laid along the upper layered roof. Because the metal net is easy to corrode and the plastic net is not enough in strength, the regenerated top plate formed by the method has the characteristics of being not enough in stability and poor in bonding property between broken rock bodies. In the process of lower-layer mining, the traditional anchor rod supporting technology cannot effectively control the stability of the regenerated top plate due to the fact that the traditional anchor rod supporting technology cannot be anchored to a stable rock stratum, and therefore the safety and high-efficiency production of coal mines are threatened. Meanwhile, in the process of mining the coal seam in the extremely close range, the disturbance of the mining of the upper coal seam on the bottom plate also causes the support of the lower roadway to have no stable and reliable anchoring area. In order to ensure that the anchor rod can be anchored to a stable rock stratum, a regenerated top plate with simple construction process and high reliability needs to be developed, and the current situations of high difficulty and insufficient stability of the existing layered mining support are changed.
Disclosure of Invention
The invention aims to provide a mining FRP grid-coal gangue-self-compacting concrete regenerated top plate to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the upper end of the upper layer is an overlying rock stratum, the lower end of the upper layer is a reserved area rock stratum, the lower end of the reserved area rock stratum is a lower layer, an anchor rod is arranged between the reserved area rock stratums, an FRP grid is arranged at the bottom of the upper layer, artificial filling coal gangue is arranged at the upper end of the FRP grid, a second layer of the FRP grid is arranged at the upper end of the artificial filling coal gangue, a second layer of the artificial filling coal gangue is arranged at the upper end of the FRP grid, the artificial filling coal gangue is filled to the bottom of the overlying rock stratum, the FRP grid is provided with meshes, the overlying rock stratum forms naturally stacked caving rocks under the action of mine pressure, and self-compacting concrete is filled between the naturally stacked caving rocks and the artificial filling coal gangue.
Preferably, the maximum diameter of the meshes of the FRP grid is smaller than the average diameter of the artificial filling coal gangue.
Preferably, the self-compacting concrete can be prepared by mixing sand, gravel, cement and water, and also can be prepared by mixing coal gangue, sand, cement and water.
Preferably, the artificial filling coal gangue can be coal gangue directly crushed underground or coal gangue transported underground from the ground through a vertical feeding system, and the diameter range of the artificial filling coal gangue can be more than 200 mm.
Preferably, the distance between the two FRP grids is half of the thickness of the upper layer.
Preferably, the self-compacting concrete is integrally cast once after the artificial filling coal gangue is completely filled with the upper layer.
Preferably, the FRP grids may be erected in two or three layers according to an actual mining height.
A construction method of a mining FRP grid-coal gangue-self-compacting concrete regenerated top plate specifically comprises the following steps:
the method comprises the following steps: the FRP grids are laid along the bottom of the upper layer, and then a first layer of the artificial filling coal gangue is laid above the FRP grids.
Step two: and after the first layer of the artificial filling coal gangue is paved, paving a second layer of the FRP grid.
Step three: and after the second layer of FRP grids is paved, filling a second layer of the artificial filling coal gangue above the second layer of FRP grids until the second layer of the FRP grids contacts the overburden.
Step four: and after all the artificial filling coal gangue is filled, injecting the self-compacting concrete to form the final mining FRP grid-coal gangue-self-compacting concrete regeneration top plate.
The invention has the advantages of
According to the invention, the lightweight high-strength corrosion-resistant FRP grid is adopted, so that the transverse deformation of the coal gangue material can be effectively restrained, the shear strength and the elastic modulus of the coal gangue discrete material are improved, and the self-compacting concrete is used for filling the gaps of the coal gangue discrete material, so that the non-uniform settlement of the discrete aggregate can be effectively inhibited. The construction process is simple, the construction speed is high, and the formed regenerated top plate is good in stability.
Drawings
FIG. 1 is a schematic diagram of a process for stratified mining of a thick coal seam in accordance with the present invention;
FIG. 2 is a regenerated top plate formed by the natural caving method of the present invention;
FIG. 3 is a schematic structural view of an FRP grid-coal gangue-self-compacting concrete recycled roof according to the present invention;
FIG. 4 is a schematic diagram of the FRP grid-coal gangue-self-compacting concrete recycled roof construction of the invention.
Reference numerals
1-upper layering, 2-reserved area rock stratum, 3-lower layering, 4-overlying rock stratum, 5-naturally stacked collapsed rock, 6-anchor rod, 7-artificial filling coal gangue, 8-FRP grid, 9-mesh and 10-self-compacting concrete.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Examples
As shown in fig. 1-4, a mining FRP grating-coal gangue-self-compacting concrete regenerated top plate comprises an upper layer 1, wherein the upper end of the upper layer 1 is an overlying rock stratum 4, the lower end of the upper layer 1 is a reserved zone rock stratum 2, the lower end of the reserved zone rock stratum 2 is a lower layer 3, an anchor rod 6 is arranged between the reserved zone rock stratums 2, an FRP grating 8 is arranged at the bottom of the upper layer 1, an artificial filling coal gangue 7 is arranged at the upper end of the FRP grating 8, a second layer of the FRP grating 8 is arranged at the upper end of the artificial filling coal gangue 7, the artificial filling coal gangue 7 is filled to the bottom of the overlying rock stratum 4, the FRP grating 8 is provided with meshes 9, the overlying rock stratum 4 forms naturally-piled caving rocks 5 under the action of mine pressure, and self-compacting concrete 10 is filled between the naturally-piled caving rocks 5 and the artificial filling coal gangue 7.
Preferably, the diameter of the maximum meshes 9 of the FRP grid 8 is smaller than the average diameter of the artificial filling coal gangue 7.
Preferably, the self-compacting concrete 10 is formed by mixing sand, gravel, cement and water, or by mixing coal gangue, sand, cement and water.
Preferably, the artificial filling coal gangue 7 can be coal gangue directly crushed underground or coal gangue transported underground from the ground through a vertical feeding system, and the diameter range of the artificial filling coal gangue can be more than 200 mm.
Preferably, the distance between the two FRP grid layers 8 is half of the thickness of the upper layer 1.
Preferably, the self-compacting concrete 10 is integrally cast once after the coal gangue 7 is completely filled and layered.
Preferably, the FRP grating 8 may be constructed in two or three layers depending on the actual mining height.
A construction method of a mining FRP grid-coal gangue-self-compacting concrete regenerated top plate specifically comprises the following steps:
the method comprises the following steps: the FRP grid 8 is laid along the bottom of the upper layer 1, and then a first layer of artificial filling coal gangue 7 is laid above the FRP grid 8.
Step two: and after the first layer of the artificial filling coal gangue 7 is paved, paving a second layer of FRP grid 8.
Step three: and after the second layer of FRP grid 8 is paved, filling a second layer of artificial filling coal gangue 7 above the second layer of FRP grid 8 until the second layer of artificial filling coal gangue contacts the overburden 4.
Step four: after all the artificial filling of the coal gangue 7 is completed, the self-compacting concrete 10 is injected to form the final mining FRP grid-coal gangue-self-compacting concrete regenerated top plate.
In the stratified mining of the thick coal seam, an upper stratum is usually mined firstly, and then a lower stratum is mined, so that a reserved area rock stratum with a certain thickness is usually reserved between the upper stratum and the lower stratum in order to ensure the safety and stability of the lower stratum. After the upper strata is mined, the overlying strata form naturally-accumulated collapsed rocks under the action of the mine pressure. Over time, the naturally piled up caving rock will further compact and consolidate, eventually forming a regenerated roof. When the lower layer is mined, the anchor rod cannot be anchored to a stable overlying rock layer due to length limitation, so that potential safety hazards are brought.
The FRP grid is obtained by a glass Fiber Reinforced Plastic (FRP) with light weight and high strength through a pultrusion process, and the diameter of the maximum mesh of the FRP grid is smaller than the average diameter of the artificial filling coal gangue. The artificial filling coal gangue can be directly crushed coal gangue underground or coal gangue transported underground from the ground through a vertical feeding system. Different from coal gangue used in traditional gangue filling, the diameter range of the coal gangue can be larger than 200 mm, and the FRP grid improves the shear strength and the elastic modulus of the coal gangue manually filled by limiting the lateral movement of the coal gangue manually filled. The FRP grids are laid along the bottom of the upper layer, then a first layer of artificial filling coal gangue is laid above the FRP grids, and then a second layer of FRP grids is laid, wherein the longitudinal distance between the two layers of FRP grids is one meter. And then, filling the artificial coal gangue above the second layer of FRP grid until the artificial coal gangue contacts the overburden. And after the artificial filling of the coal gangue is finished, injecting self-compacting concrete to form the final mining FRP grid-coal gangue-self-compacting concrete regenerated top plate.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (2)
1. A mining FRP grid-gangue-self-compacting concrete regeneration roof is characterized in that: the coal mine underground coal mine, self-compacting concrete (10) is injected between the naturally piled caving rock (5) and the artificially filled coal gangue (7), the maximum mesh (9) diameter of the FRP grid (8) is smaller than the average diameter of the artificially filled coal gangue (7), the self-compacting concrete (10) is formed by stirring sand, stone, cement and water or is formed by stirring coal gangue, sand, cement and water, the artificially filled coal gangue (7) is coal gangue directly crushed underground or is coal gangue transported underground from the ground through a vertical feeding system, the diameter range of the artificially filled coal gangue is larger than 200 mm, the distance between the two layers of the FRP grid (8) is half of the thickness of the upper layer (1), and after the artificially filled coal gangue (7) is completely filled with the upper layer, the integral pouring is completed in one step, and the FRP grid (8) is erected into two or three layers according to the actual mining height.
2. The construction method of the mining FRP grid-coal gangue-self-compacting concrete recycled roof as recited in claim 1, characterized in that: the method is implemented by the following steps:
the method comprises the following steps: the FRP grid (8) is laid along the bottom of the upper layer (1), and then a first layer of the artificial filling coal gangue (7) is laid above the FRP grid (8);
step two: after the first layer of the artificial filling coal gangue (7) is paved, a second layer of the FRP grid (8) is paved;
step three: after the second layer of FRP grids (8) is paved, filling a second layer of the artificial filling coal gangue (7) above the second layer of FRP grids (8) until the artificial filling coal gangue contacts the overburden (4);
step four: and after all the artificial filling coal gangue (7) is filled, injecting the self-compacting concrete (10) to form a final mining FRP grid-coal gangue-self-compacting concrete regeneration top plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910432285.9A CN110118089B (en) | 2019-05-23 | 2019-05-23 | Mining FRP grid-coal gangue-self-compacting concrete regenerated top plate and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910432285.9A CN110118089B (en) | 2019-05-23 | 2019-05-23 | Mining FRP grid-coal gangue-self-compacting concrete regenerated top plate and construction method thereof |
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| CN110118089A CN110118089A (en) | 2019-08-13 |
| CN110118089B true CN110118089B (en) | 2021-09-07 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112001086B (en) * | 2020-08-26 | 2024-01-30 | 湖南科技大学 | Method for determining components of leakage air crack cementing material based on regenerated roof layering characteristics |
| CN113638770B (en) * | 2021-08-30 | 2023-07-18 | 烟台杰瑞石油装备技术有限公司 | Goaf filling equipment and method and goaf filling structure |
| CN113898373B (en) * | 2021-10-19 | 2023-10-13 | 辽宁工业大学 | FRP-PVC film shell internally filled with self-compaction gangue concrete fireproof combined coal column and reinforcing method |
| CN114294008B (en) * | 2022-01-13 | 2024-03-05 | 辽宁工业大学 | FRP strip constraint and sprayed concrete and geogrid combined coal column reinforcement method |
| CN116480367B (en) * | 2023-03-29 | 2024-07-09 | 国能经济技术研究院有限责任公司 | Construction method of integral type leveling reinforcement structure of roadway floor |
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2019
- 2019-05-23 CN CN201910432285.9A patent/CN110118089B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| JPH093745A (en) * | 1995-06-19 | 1997-01-07 | Toray Ind Inc | Reinforcing fiber sheet and concrete structure |
| JP2002038655A (en) * | 2000-07-31 | 2002-02-06 | Nippon Steel Composite Co Ltd | Strip composite frp lattice member, and concrete reinforcing method using strip composite frp lattice member |
| CN103291305A (en) * | 2013-05-22 | 2013-09-11 | 贵州开磷（集团）有限责任公司 | Quick and low-cost artificial fake roof construction method for ground mine |
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Non-Patent Citations (1)
| Title |
|---|
| FRP锚网在煤矿中的应用;王厚东;《中国建材报》;20100909;第1-2页 * |
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Effective date of registration: 20231213 Address after: 834406 No. 396, Dielun South Street, Hestoluogai Town, Hoboksar Mongol Autonomous County, Tacheng Prefecture, Xinjiang Uygur Autonomous Region Patentee after: Xukuang group Xinjiang Saier Energy Co.,Ltd. Address before: No. 666, Shengli Road, Urumqi, Xinjiang Uygur Autonomous Region Patentee before: XINJIANG University |
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