WO2018233320A1 - Coal mine underground reservoir and multi-layer grouting-based anti-seepage reinforcement method for reservoir dam - Google Patents
Coal mine underground reservoir and multi-layer grouting-based anti-seepage reinforcement method for reservoir dam Download PDFInfo
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- WO2018233320A1 WO2018233320A1 PCT/CN2018/078279 CN2018078279W WO2018233320A1 WO 2018233320 A1 WO2018233320 A1 WO 2018233320A1 CN 2018078279 W CN2018078279 W CN 2018078279W WO 2018233320 A1 WO2018233320 A1 WO 2018233320A1
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- roadway
- coal
- grouting
- reservoir
- coal mine
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- 239000003245 coal Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000002787 reinforcement Effects 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000004567 concrete Substances 0.000 claims abstract description 43
- 239000007921 spray Substances 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract 5
- 239000003673 groundwater Substances 0.000 claims description 48
- 239000002002 slurry Substances 0.000 claims description 30
- 238000003860 storage Methods 0.000 claims description 26
- 238000005065 mining Methods 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 19
- 238000007711 solidification Methods 0.000 claims description 10
- 230000008023 solidification Effects 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000002086 nanomaterial Substances 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 230000005641 tunneling Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011440 grout Substances 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 description 6
- 239000004746 geotextile Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 206010013554 Diverticulum Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012229 microporous material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011382 roller-compacted concrete Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
Images
Classifications
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
Definitions
- the invention relates to a multi-level grouting anti-seepage and strengthening method for a coal mine groundwater reservoir and a reservoir dam body, which is suitable for use in a coal mine underground reservoir and an underground storage diverticulum.
- This method utilizes the goaf formed after coal mining, the coal pillar dam of the roadway on both sides of the goaf and the retracement roadway, and the artificial construction in the roadway.
- the retaining dams are jointly constructed into a coal mine underground reservoir.
- the huge mined-out space is used for water storage, the mined-off area is used to filter and purify the water body, and the natural pressure difference is used for water supply, so that the mine water is not discharged, underground water supply, underground drainage, sewage treatment, water damage prevention,
- the comprehensive benefits of environmental protection are now fully utilized in the Shendong mining area. Safety is the primary productive force, and the safety of coal mine groundwater reservoirs is also a top priority.
- “Imperial method for groundwater reservoir and underground reservoir with anti-seepage function” uses anti-seepage, normal, roller compacted concrete and anti-seepage geotextile, black clay to construct anti-seepage layer.
- the cement used in the above method the concrete itself is a kind of microporous material, there are cracks and cracks; the black clay not only has micro cracks, micro cracks but also the cracks and cracks develop in some seasons in some seasons. Expansion; impervious geotextiles are not allowed to cover the entire roadway surface due to construction restrictions.
- After the completion of geotextile construction there will always be some defects, including joints formed by poor splicing quality and stabbed during construction. These defects, such as breaking, being broken by the underfill, and unevenly tearing the geotextile on the wall of the roadway, directly affect the seepage prevention performance of the dam.
- the dam Due to the shortcomings and shortcomings of the above-mentioned research methods, the dam has a certain anti-seepage effect, but the underground mine reservoir is a long-term storage place. As time goes by, the underground reservoir The water and water molecules in the water slowly permeate through the micro-cracks, which eventually causes the coal pillar dam to soak for a long time, the strength is reduced, the instability is destroyed, and a large amount of water is poured out in the reservoir, causing a major coal mine flood accident. Therefore, the existing methods cannot fundamentally solve the problem of seepage prevention of the dam.
- a multi-layer grouting prevention method which is simple in method and convenient to create, and uses concrete, cement slurry and nano-scale material silica sol to effectively waterproof coal mine groundwater reservoir and reservoir dam body. Seepage reinforcement method.
- a coal mine groundwater reservoir of the present invention includes a coal mine goaf space as a water storage space, a working face top plate above the coal mine goaf space, and a working face bottom plate below the coal mining
- the two sides of the empty space are boring and excavating the roadways on both sides, and the retreating roadway and the artificial dam are constructed on the other symmetrical sides.
- the anchoring devices are arranged on the roadway and the retracement roadway on both sides, and the concrete layer is arranged on the outer layer.
- a plurality of shallow grouting holes and a plurality of deep grouting holes are interposed between the side roads of the two side roadways and the retreating roadway near the coal pillar dam body.
- Multi-level grouting anti-seepage reinforcement method for coal mine groundwater reservoir dam body of coal mine groundwater reservoir determining underground water content of coal mining area according to hydrogeological data, calculating volume required for water storage according to water content, and setting groundwater by volume determination
- the area of the reservoir and the position of the coal pillar dam body, tunneling the roadway and the retracement roadway on both sides of the groundwater reservoir, spraying concrete slurry and silica sol on the wall of the roadway to form concrete and silica sol spray layer, on both sides of the roadway and the retracement roadway Close to the side of the coal pillar dam body, firstly construct a plurality of shallow grouting holes and seal the grouting, then construct a plurality of deep grouting holes and seal the grouting, and finally construct a manual retaining dam to close the roadway to form a closed coal mine groundwater. Library.
- a Determine the underground water content of the coal mining area according to the hydrogeological data, calculate the underground water storage volume required for storing the underground water content of the coal mining area, determine the required groundwater storage by taking the working face height as the height and referring to the storage coefficient of the coal mining area. Area, thereby determining the location of the coal pillar dam body of the groundwater reservoir according to the goaf;
- a plurality of shallow grouting holes are applied to the side of the coal mine dam body on both sides of the roadway and the retreating roadway, and the cement slurry is injected;
- the concrete layer after solidification of the concrete slurry has a thickness of 50-100 mm
- the silica gel layer after solidification of the double-sprayed silica sol has a thickness of 2-5 mm
- the silica sol used is a nano-scale material having a particle size of 8-20 nm.
- the shallow grouting hole has a length of 1.5-2.5 m and a grouting pressure of 1-2 MPa.
- the deep grouting hole has a length of 4-6 m and a grouting pressure of 0.5-0.8 MPa.
- the shallow grouting hole and the deep grouting hole are arranged interposed, specifically, a row of deep grouting holes below the row of shallow grouting holes are alternately arranged on the side of the roadway near the coal pillar dam body.
- the application uses concrete and silica sol spray layer to protect the surface of the coal pillar dam body, effectively preventing the surface of the coal pillar dam body from being collapsed after being pressed; the cement slurry is mainly used to reinforce the surrounding rock of the dam body crushing zone and change the stress state of the dam body.
- the effect of increasing the strength of the coal pillar dam; the injected silica sol is filled into the microporous crack, blocking the water molecular seepage channel, forming a dense wall, completely obstructing the seepage of water molecules.
- the silica sol used in the present application has fine particles and high injectability, and is easy to be filled into micro cracks and micropores, and is elongated with time to solidify the gel and effectively block the microporous cracks.
- silica sol is an inorganic material, its components are non-toxic and harmless, and it is non-polluting to water bodies, ensuring the safety of water quality.
- Multi-gradient anti-seepage reinforcement is carried out from the surface of the coal pillar dam to the interior of the coal pillar dam.
- the three divisions are clearly defined and closely cooperated.
- the joint coal pillar body itself forms a certain range of dense anti-seepage reinforcement layer.
- the reinforced dam body can effectively resist the mine pressure and water pressure.
- the nano-scale material silica sol blocks the microporous crack channel required for water and water molecules to penetrate, which may alleviate the existence of microporous cracks.
- the method is simple, easy to create, and uses concrete, cement slurry and nano-scale material silica sol, which has stable structure and good waterproof performance.
- FIG. 1 is a schematic view showing the structure of a coal mine groundwater reservoir of the present invention.
- Figure 2 is a front elevational view of the jet slurry of the coal pillar dam of the present invention.
- Figure 3 is a side view of the jet slurry of the coal pillar dam of the present invention.
- the coal mine underground reservoir of the present invention includes a coal mine goaf space as a water storage space, and an upper overburden layer 13 is above the coal mine goaf area, and an underburden layer 14 is below, and the coal mine goaf space is
- Two sides of the symmetry are separately excavated into the roadway 2 on both sides, and the retracement roadway 3 and the artificial dam dam 6 are constructed on the other symmetrical sides, and the anchoring devices are arranged on the two sides of the roadway 2 and the retracement roadway 3, and are provided on the outer layer.
- a plurality of shallow grouting holes 11 and a plurality of deep grouting holes 12 are interposed between the concrete layer and the silica sol layer, and the side roads 2 and the retreating roadway 3 adjacent to the coal pillar dam 1 are interposed.
- the multi-level grouting anti-seepage reinforcement method of the coal mine groundwater reservoir dam body of the present invention determines the underground water content of the coal mining area according to hydrogeological data, and calculates the volume required for water storage according to the water content. And the volume of the groundwater reservoir and the position of the coal pillar dam 1 are determined by the volume, and the roadway 2 and the retracement roadway 3 on both sides of the groundwater reservoir are excavated, and concrete slurry and silica sol are sprayed on the wall of the roadway to form a concrete and silica sol spray layer.
- the artificial dam 6 is constructed to close the roadway to form a closed underground mine reservoir.
- the formed roadway wall is anchored, and the concrete slurry is sprayed on the wall of the roadway between the overlying strata 13 and the underlying strata 14 until the concrete slurry is solidified.
- the silica sol is sprayed on the concrete outer side of the coal pillar dam body, and finally the concrete and silica sol spray layer 9 is formed; wherein the concrete layer after solidification of the concrete slurry is 50-100 mm, and the silica gel after solidification spray sol solidification The layer thickness is 2-5 mm, and the silica sol is a nanometer material having a particle size of 8-20 nm;
- the shallow grouting hole 11 is applied to the side of the roadway near the coal pillar dam body, and the grouting pipe 10 is used to inject the grout.
- the length of the shallow grouting hole 11 is 1.5-2.5. m, the grouting pressure is 1-2 MPa;
- a deep grouting hole 12 is applied to the side of the roadway near the coal pillar, and the silica sol is injected into the grouting pipe 10 to wait for the silica sol to solidify.
- the deep grouting hole 12 The length is 4-6m, and the grouting pressure is 0.5-0.8MPa;
- the artificial dam 6 is closed in the coal pillar dam body of the determined underground reservoir near the main road 7, and the artificial dam body 6 is brick-concrete structure support from the inside to the outside. a composite structure composed of a layer, a vermiculite or loess structure anti-seepage layer and a concrete structural layer embedded in the coal pillar, thereby forming a closed coal mine underground reservoir;
- the fissure formed by the collapse of the roof constitutes the storage space of the underground reservoir, and the groundwater generated during coal mining naturally flows to the storage space of the underground reservoir.
- the coal seam above a certain aquifer is 0.10m ⁇ 27.48m, with an average of 8.24m.
- the goaf continuously receives surface water, loose aquifer water and bedrock aquifer water supply.
- the normal water inflow of the mine is 486m 3 /h, mine hydrology
- the geological type is medium.
- the wall of the formed roadway is anchored in time.
- the concrete slurry is sprayed on the wall of the roadway between the overlying strata 13 and the underlying strata 14 until the concrete slurry solidifies.
- the concrete outer layer is sprayed with silica sol, the concrete and silica sol spray layer 9 are finally formed.
- the concrete has a spray thickness of 100 mm, and the double sprayed silica sol has a thickness of 2 mm.
- the shallow grouting hole 11 is constructed on the side of the roadway near the coal pillar dam body, the hole depth is 2 m, the spacing and the row spacing are both 1.5 m, and the shallow grouting holes at the top and bottom of the dam body are The angle between the horizontal direction is 20°, and the other shallow grouting holes are vertically punched. See Figure 2 for details. Install the grouting pipe 10 and seal the hole, and inject the cement slurry. The grouting pressure is 1.5MPa and the voltage stabilization time is 20min.
- the grouting pressure is 0.5MPa and the voltage stabilization time is 120min.
- the site shows that the multi-level grouting and anti-seepage reinforcement method of the invented coal mine groundwater reservoir dam has double effect of strengthening and anti-seepage for the coal pillar dam body, which increases the reliability of the coal mine groundwater reservoir.
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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)
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Abstract
Disclosed are a coal mine underground reservoir and a multi-layer grouting-based anti-seepage reinforcement method for a reservoir dam, applicable to the field of coal mine underground construction. The method comprises: determining the area of an underground reservoir and the location of a coal pillar dam (1) according to the volume; drilling two side tunnels (2) and withdrawal tunnels (3) of the underground reservoir; successively spraying concrete grout and silica sol on tunnel walls to form concrete and silica sol spray layers (9); constructing a plurality of shallow grouting holes (11) in the sides of the two side tunnels (2) and the withdraw tunnels (3) close to the coal pillar dam (1) and sealing the holes for grouting, and then constructing a plurality of deep grouting holes (12) and sealing the holes for grouting; and finally, constructing an artificial water retaining dam (6) to seal the tunnels, so as to form a closed coal mine underground reservoir. The reinforcement method achieves double effects of reinforcement and sealing on the coal pillar dam of the coal mine underground reservoir, and selects nano-scale, inorganic, green and efficient materials, so that the anti-seepage safety of the coal pillar dam can be ensured, and the coal mine underground reservoir is thus durable and stable. Also disclosed is a coal mine underground reservoir.
Description
本发明涉及一种煤矿地下水库及水库坝体的多层次注浆防渗加固方法，适用于施工煤矿地下水库、地下储存硐室使用。The invention relates to a multi-level grouting anti-seepage and strengthening method for a coal mine groundwater reservoir and a reservoir dam body, which is suitable for use in a coal mine underground reservoir and an underground storage diverticulum.
近年来，我国煤炭生产的重心逐渐向西部转移，西部地区(晋陕蒙宁甘五省区)探明的煤炭资源储量占全国的71.6％，而其水资源仅占全国水资源的3.9％，属于重度缺水区域。同时现在煤矿矿井水外排地面不仅污染环境，而且外排过程中水大量蒸发更加剧了水资源的短缺，因此水资源的匮乏已成为制约煤炭开采的瓶颈，为了解决这一问题，“一种矿井地下水的分布式存储方法”(CN102862775)应运而生，该方法利用煤炭开采后形成的采空区，采空区两侧巷道和回撤巷道的煤柱坝体，以及在巷道中建造的人工挡水坝共同构筑成煤矿地下水库。利用巨大的采空区空间进行储水，利用采空区矸石对水体进行过滤净化，再利用自然压差进行供水，实现了矿井水不外排、井下供水、井下排水、污水处理、水害防治、环境保护的综合效益，现已在神东矿区全面使用。安全是第一生产力，煤矿地下水库的安全问题也是重中之重，煤矿地下水库的安全问题主要是其煤柱坝体的安全稳定问题，煤柱坝体受矿压、水压等综合作用，一旦发生渗透破坏，将会造成严重的水灾事故，给煤矿带来巨大的人员和经济损失，因此必须考虑煤柱坝体的防渗和可靠性等问题。针对这一安全问题研究，“一种矿井地下水库的防渗方法”(CN102767395)提出用水泥护壁层、防渗土工布和水泥防渗层组合在一起构成防渗墙来进行防渗。“地下水库的防渗方法及具有防渗功能的地下水库”(CN102926574)使用防渗、常态、碾压混凝土和防渗土工布、黑粘土组合构筑防渗层。但是上述方法中所使用的水泥，混凝土本身就是一种微孔材料，存在着裂缝和裂隙；黑黏土不仅存在微裂缝，微裂隙而且随着时间推移，在某些季节这些裂缝和裂隙还会发育扩展；防渗土工布由于施工的限制，不可能铺满整个巷道面，另外土工布施工完成后，或多或少总会存在一些缺陷，包括拼接质量不好形成的接缝、施工时被刺破、被下填层顶破、巷道壁面不均匀撕裂土工布等这些缺陷直接影响坝体的防渗性能。In recent years, the focus of China's coal production has gradually shifted to the west. The proven reserves of coal resources in the western region (Jin, Shaanxi, Mengning and Gansu provinces) accounted for 71.6% of the country's total, while its water resources only accounted for 3.9% of the national water resources. It is a heavily water-deficient area. At the same time, the coal mine water drainage floor not only pollutes the environment, but also the large amount of water evaporation during the efflux process has further shortened the shortage of water resources. Therefore, the lack of water resources has become a bottleneck restricting coal mining. In order to solve this problem, The distributed storage method of mine groundwater (CN102862775) came into being. This method utilizes the goaf formed after coal mining, the coal pillar dam of the roadway on both sides of the goaf and the retracement roadway, and the artificial construction in the roadway. The retaining dams are jointly constructed into a coal mine underground reservoir. The huge mined-out space is used for water storage, the mined-off area is used to filter and purify the water body, and the natural pressure difference is used for water supply, so that the mine water is not discharged, underground water supply, underground drainage, sewage treatment, water damage prevention, The comprehensive benefits of environmental protection are now fully utilized in the Shendong mining area. Safety is the primary productive force, and the safety of coal mine groundwater reservoirs is also a top priority. The safety of coal mine groundwater reservoirs is mainly due to the safety and stability of its coal pillar dams. The coal pillar dams are affected by mine pressure and water pressure. Once osmotic damage occurs, it will cause serious flood accidents and bring huge personnel and economic losses to the coal mine. Therefore, the problems of seepage prevention and reliability of the coal pillar dam must be considered. In response to this safety study, "an anti-seepage method for mine underground water reservoirs" (CN102767395) proposes to use a cement retaining wall layer, an anti-seepage geotextile and a cement anti-seepage layer to form an anti-seepage wall for anti-seepage. “Imperial method for groundwater reservoir and underground reservoir with anti-seepage function” (CN102926574) uses anti-seepage, normal, roller compacted concrete and anti-seepage geotextile, black clay to construct anti-seepage layer. However, the cement used in the above method, the concrete itself is a kind of microporous material, there are cracks and cracks; the black clay not only has micro cracks, micro cracks but also the cracks and cracks develop in some seasons in some seasons. Expansion; impervious geotextiles are not allowed to cover the entire roadway surface due to construction restrictions. After the completion of geotextile construction, there will always be some defects, including joints formed by poor splicing quality and stabbed during construction. These defects, such as breaking, being broken by the underfill, and unevenly tearing the geotextile on the wall of the roadway, directly affect the seepage prevention performance of the dam.
由于上述的研究方法使用材料的缺点和不足导致的裂缝、裂隙的存在，短期内坝体具有一定的防渗效果，但煤矿地下水库是个长时间的储水场所，随着时间的推移，地下水库内的水以及水分子通过微裂隙慢渗，最终造成煤柱坝体长时间浸水，强度降低，失稳破坏，水库内水体大量涌出，造成重大的煤矿水灾事故。因此现有方法都不能从根本上解决坝体的防渗问题。Due to the shortcomings and shortcomings of the above-mentioned research methods, the dam has a certain anti-seepage effect, but the underground mine reservoir is a long-term storage place. As time goes by, the underground reservoir The water and water molecules in the water slowly permeate through the micro-cracks, which eventually causes the coal pillar dam to soak for a long time, the strength is reduced, the instability is destroyed, and a large amount of water is poured out in the reservoir, causing a major coal mine flood accident. Therefore, the existing methods cannot fundamentally solve the problem of seepage prevention of the dam.
发明内容Summary of the invention
技术问题：针对上述技术的不足之处，提供一种方法简单，创造方便，使用混凝土、水泥浆以及纳米级材料硅溶胶，即可有效防水的煤矿地下水库及水库坝体的多层次注浆防渗加固方法。Technical problems: In view of the deficiencies of the above technologies, a multi-layer grouting prevention method is provided, which is simple in method and convenient to create, and uses concrete, cement slurry and nano-scale material silica sol to effectively waterproof coal mine groundwater reservoir and reservoir dam body. Seepage reinforcement method.
技术方案：为实现上述技术目的，本发明的一种煤矿地下水库，其包括作为储水空间的煤矿采空区空间，煤矿采空区空间上方为工作面顶板，下方为工作面底板，煤矿采空区空间 对称两侧分别掘进出两侧巷道，并在另外对称两侧施工回撤巷道和人工挡水坝，两侧巷道和回撤巷道上设有锚固装置，并在外层先后设有混凝土层和硅溶胶层，两侧巷道和回撤巷道的靠近煤柱坝体的帮侧施工上间插设有多个浅注浆孔和多个深注浆孔。Technical Solution: In order to achieve the above technical purpose, a coal mine groundwater reservoir of the present invention includes a coal mine goaf space as a water storage space, a working face top plate above the coal mine goaf space, and a working face bottom plate below the coal mining The two sides of the empty space are boring and excavating the roadways on both sides, and the retreating roadway and the artificial dam are constructed on the other symmetrical sides. The anchoring devices are arranged on the roadway and the retracement roadway on both sides, and the concrete layer is arranged on the outer layer. In the silica sol layer, a plurality of shallow grouting holes and a plurality of deep grouting holes are interposed between the side roads of the two side roadways and the retreating roadway near the coal pillar dam body.
一种煤矿地下水库的煤矿地下水库坝体的多层次注浆防渗加固方法，根据水文地质资料确定采煤区地下含水量，根据含水量计算储水所需的容积，并通过容积确定设置地下水库的面积以及煤柱坝体的位置，掘进地下水库两侧巷道和回撤巷道，在巷道壁上先后喷射混凝土浆液和硅溶胶，形成混凝土和硅溶胶喷层，对两侧巷道和回撤巷道靠近煤柱坝体的帮侧先施工多个浅注浆孔并封孔注浆，后施工多个深注浆孔并封孔注浆，最后建造人工挡水坝封闭巷道，从而形成封闭的煤矿地下水库。Multi-level grouting anti-seepage reinforcement method for coal mine groundwater reservoir dam body of coal mine groundwater reservoir, determining underground water content of coal mining area according to hydrogeological data, calculating volume required for water storage according to water content, and setting groundwater by volume determination The area of the reservoir and the position of the coal pillar dam body, tunneling the roadway and the retracement roadway on both sides of the groundwater reservoir, spraying concrete slurry and silica sol on the wall of the roadway to form concrete and silica sol spray layer, on both sides of the roadway and the retracement roadway Close to the side of the coal pillar dam body, firstly construct a plurality of shallow grouting holes and seal the grouting, then construct a plurality of deep grouting holes and seal the grouting, and finally construct a manual retaining dam to close the roadway to form a closed coal mine groundwater. Library.
具体步骤如下：Specific steps are as follows:
a.根据水文地质资料确定采煤区地下含水量，计算储存采煤区地下含水量所需的地下水库容积，以工作面采高为高度并参考采煤区域储水系数，确定地下水库需要的面积，从而根据采空区确定设置地下水库煤柱坝体的位置；a. Determine the underground water content of the coal mining area according to the hydrogeological data, calculate the underground water storage volume required for storing the underground water content of the coal mining area, determine the required groundwater storage by taking the working face height as the height and referring to the storage coefficient of the coal mining area. Area, thereby determining the location of the coal pillar dam body of the groundwater reservoir according to the goaf;
b.随着煤层的开采，在选定的地下水库施工处正常掘进出地下水库两侧巷道和回撤巷道，在掘进地下水库两侧巷道和回撤巷道时监测各巷道围岩性质的变化和孔裂隙发育的情况；b. With the exploitation of coal seams, the tunnels on both sides of the groundwater reservoir and the retracement roadway are normally excavated in the selected groundwater reservoir construction site, and the changes in the surrounding rock properties of each roadway are monitored when the roadway on both sides of the groundwater reservoir is digged and the roadway is retracted. The development of pore fissures;
c.随着地下水库两侧巷道和回撤巷道的掘进，对已构成的两侧巷道和回撤巷道巷道壁进行锚固，并在巷道壁上喷射混凝土浆液，待混凝土浆液凝固后，对巷道靠近煤柱坝体的帮侧混凝土外层复喷硅溶胶；c. With the tunneling of the roadway and the retracing roadway on both sides of the groundwater reservoir, the adjacent roadway and the hoistway roadway wall are anchored, and the concrete slurry is sprayed on the roadway wall. After the concrete slurry solidifies, the roadway is approached. Re-spraying silica sol on the outer side of the concrete side of the coal pillar dam;
d.待硅溶胶喷层凝固后，对两侧巷道和回撤巷道靠近煤柱坝体的帮侧施工多个浅注浆孔，并注入水泥浆；d. After the solidification of the silica sol spray layer, a plurality of shallow grouting holes are applied to the side of the coal mine dam body on both sides of the roadway and the retreating roadway, and the cement slurry is injected;
e.待浅注浆孔注的水泥浆凝固后，对巷道靠近煤柱坝体的帮侧施工多个深注浆孔，并注入硅溶胶，等待硅溶胶凝固；e. After the cement slurry to be injected into the shallow grouting hole is solidified, a plurality of deep grouting holes are applied to the side of the roadway near the coal pillar dam body, and a silica sol is injected, waiting for the silica sol to solidify;
f.当采煤工作面回采完成后，在确定的地下水库靠近大巷的煤柱坝体间建造人工挡水坝封闭巷道，从而形成封闭的煤矿地下水库。f. When the coal mining face is completed, a manual dam is closed between the determined coal mines near the main coal reservoir to form a closed coal mine underground reservoir.
所述混凝土浆液凝固后的混凝土层厚为50-100mm，复喷硅溶胶凝固后的硅胶层厚2-5mm，使用的硅溶胶为颗粒度为8-20nm的纳米级材料。The concrete layer after solidification of the concrete slurry has a thickness of 50-100 mm, and the silica gel layer after solidification of the double-sprayed silica sol has a thickness of 2-5 mm, and the silica sol used is a nano-scale material having a particle size of 8-20 nm.
所述浅注浆孔的长度为1.5-2.5m，注浆压力为1-2MPa。The shallow grouting hole has a length of 1.5-2.5 m and a grouting pressure of 1-2 MPa.
所述深注浆孔的长度为4-6m，注浆压力为0.5-0.8MPa。The deep grouting hole has a length of 4-6 m and a grouting pressure of 0.5-0.8 MPa.
所述浅注浆孔和深注浆孔安排间插设置，具体为在巷道靠近煤柱坝体的帮侧上按照一排浅注浆孔下方一排深注浆孔交替设置。The shallow grouting hole and the deep grouting hole are arranged interposed, specifically, a row of deep grouting holes below the row of shallow grouting holes are alternately arranged on the side of the roadway near the coal pillar dam body.
本申请使用混凝土和硅溶胶喷层护住煤柱坝体表面，有效防止煤柱坝体受压后表面崩落；注入水泥浆主要起到加固坝体破碎区围岩，改变坝体受力状态，提升煤柱坝体强度的作用；注入的硅溶胶填充进入微孔裂隙，堵死水分子渗流通道，形成一层致密的墙，彻底阻碍水分子的渗流。本申请使用的材料硅溶胶，颗粒细致，可注性非常高，便于填充入微裂缝、微孔隙，并随时间的加长，固结凝胶，有效封堵住微孔裂隙。另外硅溶胶是一种无机材料，其成 分无毒无害，对水体无污染性，可以确保水质的安全。The application uses concrete and silica sol spray layer to protect the surface of the coal pillar dam body, effectively preventing the surface of the coal pillar dam body from being collapsed after being pressed; the cement slurry is mainly used to reinforce the surrounding rock of the dam body crushing zone and change the stress state of the dam body. The effect of increasing the strength of the coal pillar dam; the injected silica sol is filled into the microporous crack, blocking the water molecular seepage channel, forming a dense wall, completely obstructing the seepage of water molecules. The silica sol used in the present application has fine particles and high injectability, and is easy to be filled into micro cracks and micropores, and is elongated with time to solidify the gel and effectively block the microporous cracks. In addition, silica sol is an inorganic material, its components are non-toxic and harmless, and it is non-polluting to water bodies, ensuring the safety of water quality.
充分发挥了水库煤柱坝体本身的作用，混凝土、水泥浆、硅溶胶三者与煤柱坝体本身紧密配合，共同形成一堵致密的加固防渗墙，而不是单纯的使用材料另建一堵防渗墙，其加固防渗的效果也比单纯的防渗墙的效果要好多倍。Give full play to the role of the reservoir coal pillar dam itself. The concrete, cement slurry and silica sol are closely matched with the coal pillar dam itself to form a dense reinforced seepage wall, instead of simply using another material. Blocking the seepage wall, the effect of reinforcing the seepage prevention is also many times better than that of the simple anti-seepage wall.
由于使用的混凝土，水泥浆，硅溶胶性质均是随时间推移不断凝结加固的，所以随时间的增加，煤柱坝体的加固防渗效果更稳定，煤矿地下水库安全性更牢固可靠，可供长期储水。Due to the concrete, cement slurry and silica sol properties are continuously condensed and strengthened over time, the reinforced and anti-seepage effect of the coal pillar dam is more stable with time, and the safety of the underground mine reservoir is more reliable and reliable. Long-term storage of water.
从煤柱坝体表面到煤柱坝体内部进行多梯度防渗加固。喷射混凝土护表，注入水泥浆主要起加固作用，注入硅溶胶填充微孔裂隙防渗，三者分工明确，紧密合作，联合煤柱坝体本身形成了一定范围的致密的防渗加固层，一方面加固了坝体，使坝体能有效地抵挡矿压、水压作用，另一方面纳米级材料硅溶胶堵死水和水分子渗透所需的微孔裂隙通道，缓解由于微孔裂隙的存在可能造成的重大煤矿水灾事故。方法简单，创造方便，使用混凝土、水泥浆以及纳米级材料硅溶胶，结构稳定，防水性能好。Multi-gradient anti-seepage reinforcement is carried out from the surface of the coal pillar dam to the interior of the coal pillar dam. The shotcrete protection watch, the cement slurry is mainly used for reinforcement, and the silica sol is filled to fill the microporous cracks. The three divisions are clearly defined and closely cooperated. The joint coal pillar body itself forms a certain range of dense anti-seepage reinforcement layer. The reinforced dam body can effectively resist the mine pressure and water pressure. On the other hand, the nano-scale material silica sol blocks the microporous crack channel required for water and water molecules to penetrate, which may alleviate the existence of microporous cracks. Major coal mine flood accidents. The method is simple, easy to create, and uses concrete, cement slurry and nano-scale material silica sol, which has stable structure and good waterproof performance.
图1是本发明的煤矿地下水库结构示意图。1 is a schematic view showing the structure of a coal mine groundwater reservoir of the present invention.
图2是本发明的煤柱坝体喷注浆主视图。Figure 2 is a front elevational view of the jet slurry of the coal pillar dam of the present invention.
图3是本发明的煤柱坝体喷注浆侧视图。Figure 3 is a side view of the jet slurry of the coal pillar dam of the present invention.
图中：1-煤柱坝体；2-两侧巷道；3-回撤巷道；4-采煤工作面；5-回采巷道；6-人工挡水坝；7-大巷；8-采空区；9-混凝土和硅溶胶喷层；10-注浆管；11-浅注浆孔；12-深注浆孔；13-上覆岩层；14-下覆岩层。In the figure: 1 - coal pillar dam body 2 - 2 sides roadway; 3 - withdrawal roadway; 4 - coal mining face; 5 - mining roadway; 6 - artificial retaining dam; 7 - main road; 9-concrete and silica sol sprayed layer; 10-grouting pipe; 11-shallow grouting hole; 12-deep grouting hole; 13-overburden layer; 14-underlying stratum.
下面结合附图对本发明的一个实施例作进一步的描述：An embodiment of the present invention will be further described below with reference to the accompanying drawings:
如图1所示，本发明的煤矿地下水库，其包括作为储水空间的煤矿采空区空间，煤矿采空区空间上方为上覆岩层13，下方为下覆岩层14，煤矿采空区空间对称两侧分别掘进出两侧巷道2，并在另外对称两侧施工有回撤巷道3和人工挡水坝6，两侧巷道2和回撤巷道3上设有锚固装置，并在外层先后设有混凝土层和硅溶胶层，两侧巷道2和回撤巷道3的靠近煤柱坝体1的帮侧施工上间插设有多个浅注浆孔11和多个深注浆孔12。As shown in FIG. 1 , the coal mine underground reservoir of the present invention includes a coal mine goaf space as a water storage space, and an upper overburden layer 13 is above the coal mine goaf area, and an underburden layer 14 is below, and the coal mine goaf space is Two sides of the symmetry are separately excavated into the roadway 2 on both sides, and the retracement roadway 3 and the artificial dam dam 6 are constructed on the other symmetrical sides, and the anchoring devices are arranged on the two sides of the roadway 2 and the retracement roadway 3, and are provided on the outer layer. A plurality of shallow grouting holes 11 and a plurality of deep grouting holes 12 are interposed between the concrete layer and the silica sol layer, and the side roads 2 and the retreating roadway 3 adjacent to the coal pillar dam 1 are interposed.
如图2和图3所示，本发明的煤矿地下水库坝体的多层次注浆防渗加固方法，根据水文地质资料确定采煤区地下含水量，根据含水量计算储水所需的容积，并通过容积确定设置地下水库的面积以及煤柱坝体1的位置，掘进地下水库两侧巷道2和回撤巷道3，在巷道壁上先后喷射混凝土浆液和硅溶胶，形成混凝土和硅溶胶喷层9，对两侧巷道2和回撤巷道3靠近煤柱坝体1的帮侧先施工多个浅注浆孔11并封孔注浆，后施工多个深注浆孔12并封孔注浆，最后建造人工挡水坝6封闭巷道，从而形成封闭的煤矿地下水库。As shown in FIG. 2 and FIG. 3, the multi-level grouting anti-seepage reinforcement method of the coal mine groundwater reservoir dam body of the present invention determines the underground water content of the coal mining area according to hydrogeological data, and calculates the volume required for water storage according to the water content. And the volume of the groundwater reservoir and the position of the coal pillar dam 1 are determined by the volume, and the roadway 2 and the retracement roadway 3 on both sides of the groundwater reservoir are excavated, and concrete slurry and silica sol are sprayed on the wall of the roadway to form a concrete and silica sol spray layer. 9. For the two sides of the roadway 2 and the retreating roadway 3, close to the side of the coal pillar dam body 1, firstly construct a plurality of shallow grouting holes 11 and seal the grouting, and then construct a plurality of deep grouting holes 12 and seal the grouting Finally, the artificial dam 6 is constructed to close the roadway to form a closed underground mine reservoir.
具体步骤如下：Specific steps are as follows:
a.根据水文地质资料确定采煤区地下含水量，计算储存采煤区地下含水量所需的地下水库容积，以工作面采高为高度，并参考一定的储水系数，确定地下水库需要的面积，从而根据采空区8确定地下水库的地下水库煤柱坝体1的位置；a. Determine the underground water content of the coal mining area according to the hydrogeological data, calculate the underground water storage volume required to store the underground water content of the coal mining area, take the working face height as the height, and refer to a certain water storage coefficient to determine the required underground water storage. The area, thereby determining the location of the groundwater reservoir coal pillar dam 1 of the groundwater reservoir according to the goaf 8;
b.随着煤层的开采，正常掘进出选定的地下水库施工处的地下水库两侧巷道2和回撤巷道3，在掘进地下水库两侧巷道2和回撤巷道3时监测巷道围岩性质的变化和孔裂隙发育的情况；b. With the mining of coal seams, the tunnels 2 and the retreating roadway 3 on both sides of the groundwater reservoir at the selected groundwater reservoir construction site are normally excavated, and the surrounding rock properties of the roadway are monitored when the roadway 2 and the retreating roadway 3 on both sides of the groundwater reservoir are excavated. Changes and the development of pore fissures;
c.随着地下水库两侧巷道和回撤巷道的掘进，对构成的巷道壁进行锚固，并在上覆岩层13与下覆岩层14之间的巷道壁上喷射混凝土浆液，待混凝土浆液凝固后，对巷道靠煤柱坝体帮侧混凝土外层复喷硅溶胶，最终形成混凝土和硅溶胶喷层9；其中混凝土浆液凝固后的混凝土层厚为50-100mm，复喷硅溶胶凝固后的硅胶层厚2-5mm，硅溶胶为粒度为8-20nm纳米级材料；c. With the tunneling of the roadway and the retreating roadway on both sides of the groundwater reservoir, the formed roadway wall is anchored, and the concrete slurry is sprayed on the wall of the roadway between the overlying strata 13 and the underlying strata 14 until the concrete slurry is solidified. For the roadway, the silica sol is sprayed on the concrete outer side of the coal pillar dam body, and finally the concrete and silica sol spray layer 9 is formed; wherein the concrete layer after solidification of the concrete slurry is 50-100 mm, and the silica gel after solidification spray sol solidification The layer thickness is 2-5 mm, and the silica sol is a nanometer material having a particle size of 8-20 nm;
d.待硅溶胶喷层凝固后，对巷道靠近煤柱坝体的帮侧施工浅注浆孔11，并利用注浆管10注入水泥浆，所述浅注浆孔11的长度为1.5-2.5m，注浆压力为1-2MPa；d. After the silica sol spray layer is solidified, the shallow grouting hole 11 is applied to the side of the roadway near the coal pillar dam body, and the grouting pipe 10 is used to inject the grout. The length of the shallow grouting hole 11 is 1.5-2.5. m, the grouting pressure is 1-2 MPa;
e.待注浆孔中的水泥浆凝固后，对巷道靠近煤柱的帮侧施工深注浆孔12，并利用注浆管10注入硅溶胶，等待硅溶胶凝固，所述深注浆孔12的长度为4-6m，注浆压力为0.5-0.8MPa；e. After the cement slurry in the grouting hole is solidified, a deep grouting hole 12 is applied to the side of the roadway near the coal pillar, and the silica sol is injected into the grouting pipe 10 to wait for the silica sol to solidify. The deep grouting hole 12 The length is 4-6m, and the grouting pressure is 0.5-0.8MPa;
f.当采煤工作面回采完成后，在确定的地下水库靠近大巷7的煤柱坝体1间建造人工挡水坝6封闭巷道，所述人工坝体6从内向外依次为砖混结构支撑层、矸石或黄土结构防渗层和嵌入煤柱中的混凝土结构层构成的复合结构，从而形成封闭的煤矿地下水库；f. After the mining face is completed, the artificial dam 6 is closed in the coal pillar dam body of the determined underground reservoir near the main road 7, and the artificial dam body 6 is brick-concrete structure support from the inside to the outside. a composite structure composed of a layer, a vermiculite or loess structure anti-seepage layer and a concrete structural layer embedded in the coal pillar, thereby forming a closed coal mine underground reservoir;
利用顶板垮塌后的形成的裂隙构成地下水库储水空间，采煤时产生的地下水自然渗流至该地下水库储水空间。The fissure formed by the collapse of the roof constitutes the storage space of the underground reservoir, and the groundwater generated during coal mining naturally flows to the storage space of the underground reservoir.
实施例1：Example 1:
某煤矿煤层上覆含水层0.10m～27.48m，平均8.24m，采空区不断接受地表水，松散含水层水及基岩含水层水的补给，矿井正常涌水量为486m
3/h，矿井水文地质类型为中等。
The coal seam above a certain aquifer is 0.10m~27.48m, with an average of 8.24m. The goaf continuously receives surface water, loose aquifer water and bedrock aquifer water supply. The normal water inflow of the mine is 486m 3 /h, mine hydrology The geological type is medium.
考虑储水系数计算后确定由六个工作面采空区构建一完整的煤矿地下水库，地下水库两侧巷道2和回撤巷道均3为矩形断面，巷道高4.4m，煤柱坝体宽30m。Considering the calculation of the water storage coefficient, it is determined that a complete coal mine groundwater reservoir is constructed from the six working face goafs. The roadway 2 and the retreating roadway on both sides of the groundwater reservoir are all rectangular sections, the roadway height is 4.4m, and the coal pillar dam body width is 30m. .
地下水库两侧巷道2和回撤巷道3掘进后，及时对构成的巷道壁进行锚固，锚固后立即在上覆岩层13与下覆岩层14之间的巷道壁上喷射混凝土浆液，待混凝土浆液凝固后混凝土外层复喷硅溶胶，最终形成混凝土和硅溶胶喷层9，混凝土的喷射厚度为100mm，复喷硅溶胶，厚度为2mm；所使用的混凝土、水泥浆和硅溶胶三种材料参数为：常态混凝土，水泥浆的水灰比＝0.8:1；硅溶胶A料：B料＝4:1，A料为二氧化硅胶体，B料为催化剂氯化钠溶液，。After the roadway 2 and the retracement roadway 3 on both sides of the groundwater reservoir are excavated, the wall of the formed roadway is anchored in time. Immediately after anchoring, the concrete slurry is sprayed on the wall of the roadway between the overlying strata 13 and the underlying strata 14 until the concrete slurry solidifies. After the concrete outer layer is sprayed with silica sol, the concrete and silica sol spray layer 9 are finally formed. The concrete has a spray thickness of 100 mm, and the double sprayed silica sol has a thickness of 2 mm. The three material parameters of the concrete, cement slurry and silica sol used are : Normal concrete, water cement ratio of cement slurry = 0.8:1; silica sol A material: B material = 4:1, material A is silica colloid, and material B is catalyst sodium chloride solution.
混凝土和硅溶胶喷层9凝结后，在巷道靠近煤柱坝体的帮侧施工浅注浆孔11，孔深2m，间距和排距均为1.5m，坝体顶部和底部浅注浆孔与水平方向夹角20°，其余浅注浆孔均垂直打孔，详见图2，安设注浆管10并封孔，注入水泥浆，注浆压力为1.5MPa，稳压时间20min。After the concrete and the silica sol spray layer 9 are condensed, the shallow grouting hole 11 is constructed on the side of the roadway near the coal pillar dam body, the hole depth is 2 m, the spacing and the row spacing are both 1.5 m, and the shallow grouting holes at the top and bottom of the dam body are The angle between the horizontal direction is 20°, and the other shallow grouting holes are vertically punched. See Figure 2 for details. Install the grouting pipe 10 and seal the hole, and inject the cement slurry. The grouting pressure is 1.5MPa and the voltage stabilization time is 20min.
注入的水泥浆凝结后，进行深部注硅溶胶，硅溶胶A料：B料＝9:1，在巷道靠近煤柱坝体的帮侧施工深注浆孔12，孔深4m，间距和排距均为1.5m，深注浆孔均垂直打孔，详见图2，注浆压力为0.5MPa，稳压时间120min。After the injected cement slurry is condensed, a deep silica sol is prepared, and the silica sol A material: B material = 9:1, deep grouting hole 12 is constructed in the side of the roadway near the coal pillar dam body, the hole depth is 4 m, the spacing and the row spacing Both are 1.5m, and the deep grouting holes are vertically punched. See Figure 2 for details. The grouting pressure is 0.5MPa and the voltage stabilization time is 120min.
现场表明，发明的一种煤矿地下水库坝体的多层次注浆防渗加固方法，对煤柱坝体起到了加固和防渗双重效果，增加了煤矿地下水库的可靠性。The site shows that the multi-level grouting and anti-seepage reinforcement method of the invented coal mine groundwater reservoir dam has double effect of strengthening and anti-seepage for the coal pillar dam body, which increases the reliability of the coal mine groundwater reservoir.
Claims (7)
- 一种煤矿地下水库，其特征在于：其包括作为储水空间的煤矿采空区空间，煤矿采空区空间上方为工作面顶板，下方为工作面底板，煤矿采空区空间对称两侧分别掘进出两侧巷道，并在另外对称两侧施工回撤巷道和人工挡水坝，两侧巷道和回撤巷道上设有锚固装置，并在外层先后设有混凝土层和硅溶胶层，两侧巷道和回撤巷道的靠近煤柱坝体的帮侧施工上间插设有多个浅注浆孔和多个深注浆孔。A coal mine groundwater reservoir, characterized in that it comprises a coal mine goaf space as a water storage space, a working face top plate above the coal mine goaf space, a working face bottom plate at the bottom, and a spatially symmetric side of the coal mine goaf area respectively The roadway on both sides is exited, and the retracement roadway and the artificial retaining dam are constructed on the other symmetrical sides. The anchoring device is arranged on the roadway and the retracement roadway on both sides, and the concrete layer and the silica sol layer are successively arranged on the outer layer, and the roadway on both sides and A plurality of shallow grouting holes and a plurality of deep grouting holes are interposed between the slabs of the retrace roadway near the coal pillar dam body.
- 一种使用权利要求1所述煤矿地下水库的煤矿地下水库坝体的多层次注浆防渗加固方法，其特征在于：根据水文地质资料确定采煤区地下含水量，根据含水量计算储水所需的容积，并通过容积确定设置地下水库的面积以及煤柱坝体的位置，掘进地下水库两侧巷道和回撤巷道，在巷道壁上先后喷射混凝土浆液和硅溶胶，形成混凝土和硅溶胶喷层，对两侧巷道和回撤巷道靠近煤柱坝体的帮侧先施工多个浅注浆孔并封孔注浆，后施工多个深注浆孔并封孔注浆，最后建造人工挡水坝封闭巷道，从而形成封闭的煤矿地下水库。A multi-layer grouting anti-seepage reinforcement method for a coal mine groundwater reservoir dam body using the coal mine groundwater reservoir according to claim 1, characterized in that: the hydrogeological data is used to determine the underground water content of the coal mining area, and the water storage area is calculated according to the water content The volume required, and the area of the groundwater reservoir and the position of the coal pillar dam are determined by the volume. The roadway and the retracement roadway on both sides of the groundwater reservoir are excavated, and concrete slurry and silica sol are sprayed on the wall of the roadway to form concrete and silica sol spray. Layer, constructing multiple shallow grouting holes and sealing grouting on the side of the coal road dam body on both sides of the roadway and the retreating roadway, then constructing multiple deep grouting holes and sealing grouting, and finally constructing artificial block The dam closes the roadway, thereby forming a closed underground mine reservoir.
- 如权利要求2所述的煤矿地下水库坝体的多层次注浆防渗加固方法，其特征在于，具体步骤如下：The multi-layer grouting anti-seepage reinforcement method for a coal mine underground water reservoir dam body according to claim 2, wherein the specific steps are as follows:a.根据水文地质资料确定采煤区地下含水量，计算储存采煤区地下含水量所需的地下水库容积，以工作面采高为高度并参考采煤区域储水系数，确定地下水库需要的面积，从而根据采空区确定设置地下水库煤柱坝体的位置；a. Determine the underground water content of the coal mining area according to the hydrogeological data, calculate the underground water storage volume required for storing the underground water content of the coal mining area, determine the required groundwater storage by taking the working face height as the height and referring to the storage coefficient of the coal mining area. Area, thereby determining the location of the coal pillar dam body of the groundwater reservoir according to the goaf;b.随着煤层的开采，在选定的地下水库施工处正常掘进出地下水库两侧巷道和回撤巷道，在掘进地下水库两侧巷道和回撤巷道时监测各巷道围岩性质的变化和孔裂隙发育的情况；b. With the exploitation of coal seams, the tunnels on both sides of the groundwater reservoir and the retracement roadway are normally excavated in the selected groundwater reservoir construction site, and the changes in the surrounding rock properties of each roadway are monitored when the roadway on both sides of the groundwater reservoir is digged and the roadway is retracted. The development of pore fissures;c.随着地下水库两侧巷道和回撤巷道的掘进，对已构成的两侧巷道和回撤巷道巷道壁进行锚固，并在巷道壁上喷射混凝土浆液，待混凝土浆液凝固后，对巷道靠近煤柱坝体的帮侧混凝土外层复喷硅溶胶；c. With the tunneling of the roadway and the retracing roadway on both sides of the groundwater reservoir, the adjacent roadway and the hoistway roadway wall are anchored, and the concrete slurry is sprayed on the roadway wall. After the concrete slurry solidifies, the roadway is approached. Re-spraying silica sol on the outer side of the concrete side of the coal pillar dam;d.待硅溶胶喷层凝固后，对两侧巷道和回撤巷道靠近煤柱坝体的帮侧施工多个浅注浆孔，并注入水泥浆；d. After the solidification of the silica sol spray layer, a plurality of shallow grouting holes are applied to the side of the coal mine dam body on both sides of the roadway and the retreating roadway, and the cement slurry is injected;e.待浅注浆孔注的水泥浆凝固后，对巷道靠近煤柱坝体的帮侧施工多个深注浆孔，并注入硅溶胶，等待硅溶胶凝固；e. After the cement slurry to be injected into the shallow grouting hole is solidified, a plurality of deep grouting holes are applied to the side of the roadway near the coal pillar dam body, and a silica sol is injected, waiting for the silica sol to solidify;f.当采煤工作面回采完成后，在确定的地下水库靠近大巷的煤柱坝体间建造人工挡水坝封闭巷道，从而形成封闭的煤矿地下水库。f. When the coal mining face is completed, a manual dam is closed between the determined coal mines near the main coal reservoir to form a closed coal mine underground reservoir.
- 如权利要求3所述的煤矿地下水库坝体的多层次注浆防渗加固方法，其特征在于：所述混凝土浆液凝固后的混凝土层厚为50-100mm，复喷硅溶胶凝固后的硅胶层厚2-5mm，使用的硅溶胶为颗粒度为8-20nm的纳米级材料。The multi-layer grouting anti-seepage reinforcement method for a coal mine groundwater reservoir dam body according to claim 3, wherein the concrete layer after solidification is 50-100 mm thick, and the silica gel layer after solidification spray sol solidification The thickness of 2-5 mm, the silica sol used is a nano-scale material with a particle size of 8-20 nm.
- 如权利要求3所述的煤矿地下水库坝体的多层次注浆防渗加固方法，其特征在于：所述浅注浆孔的长度为1.5-2.5m，注浆压力为1-2MPa。The multi-layer grouting anti-seepage reinforcement method for a coal mine underground water storage dam body according to claim 3, wherein the shallow grouting hole has a length of 1.5-2.5 m and a grouting pressure of 1-2 MPa.
- 如权利要求3所述的煤矿地下水库坝体的多层次注浆防渗加固方法，其特征在于：所述深注浆孔的长度为4-6m，注浆压力为0.5-0.8MPa。The multi-layer grouting anti-seepage reinforcement method for a coal mine groundwater storage dam body according to claim 3, wherein the deep grouting hole has a length of 4-6 m and a grouting pressure of 0.5-0.8 MPa.
- 如权利要求5或6所述的煤矿地下水库坝体的多层次注浆防渗加固方法，其特征在于：所述浅注浆孔和深注浆孔安排间插设置，具体为在巷道靠近煤柱坝体的帮侧上按照一排浅注 浆孔下方一排深注浆孔交替设置。The multi-layer grouting anti-seepage reinforcement method for a coal mine groundwater storage dam body according to claim 5 or 6, wherein the shallow grouting hole and the deep grouting hole are arranged interposed, specifically, the coal roadway is close to the coal The dam side of the column dam body is alternately arranged according to a row of deep grouting holes below a row of shallow grouting holes.
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