CN105545309A - Method for filling bilateral parts beside pillar with repeatedly-mined left-over coal pillars in residual mining area - Google Patents
Method for filling bilateral parts beside pillar with repeatedly-mined left-over coal pillars in residual mining area Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 128
- 238000005065 mining Methods 0.000 title claims abstract description 62
- 230000002146 bilateral effect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000000694 effects Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000000505 pernicious effect Effects 0.000 claims description 9
- 238000011835 investigation Methods 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 239000006210 lotion Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 2
- 230000007774 longterm Effects 0.000 abstract description 6
- 230000001052 transient effect Effects 0.000 abstract 1
- 230000004888 barrier function Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process 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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- C—CHEMISTRY; METALLURGY
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a method for filling bilateral parts beside a pillar with repeatedly-mined left-over coal pillars in a residual mining area. According to the invention, on the basis of exploration and identification of the left-over coal pillars in the residual mining area, the distributive locations and sizes of pillar mining areas, lateral protection of the left-over coal pillars in the residual mining area are successively carried out by using a sectioned filling method for the bilateral parts beside the pillar; a conveyor gateway and an air return gateway are dug in bilateral filling bodies beside the pillar; and short-wall mechanization working faces are arranged for repeated mining of the left-over coal pillars in the residual mining area. The method provided by the invention makes full use of the left-over coal pillars in the residual mining area, alleviates contradiction between finiteness of coal resources and infiniteness of consumer demands, avoids transient instability, domino instability or other dynamic disasters caused by coal pillars left by pillar mining under action of long-term creep effect, and guarantees safe repeated mining of the left-over coal pillars in the residual mining area by using the bilateral filling bodies beside the pillar.
Description
Technical field
The present invention relates to technical field of coal exploitation, especially relate to the method that coal column is left in the other residual exploiting field of bilateral part filling second mining of a kind of post, be mainly applicable to the safe working that coal column is left in residual exploiting field.
Background technology
In recent years, the second mining that coal column is left in residual exploiting field more and more becomes the focus that people pay close attention to, and it has good extraction value.The contradiction that coal column can slow down coal resources finiteness and consumption demand unlimitedness thereof is left in the residual exploiting field of second mining, not only can improve the recovery ratio of coal resources, enterprise economic benefit, and can extend mine service-life, promotes sustainable development.
Due to the restriction of technology, economic dispatch factor, some collieries of China for pursue short-term interests, occurred exploitation of coal resources adopt thick abandon thin, adopt fertilizer lose thin, adopt excellent of inferior quality phenomenon of abandoning, cause abandoning of many pieces of section coal columns to be adopted; Meanwhile, for preventing or reducing the infringement of recovery activity to above ground structure, water body and railway etc., many mining areas generally adopt barrier system exploitation to maintain the stability of stope overlying strata, and then make a large amount of residual exploiting field leave over the formation of coal column.
Adopt and formation along with leaving over abandoning of coal column, stope stress redistributes because leaving over the releasing of coal column lateral stress.The stress leaving over coal column like this will be become the load of Relatively centralized distribution from original equally distributed load.Leave over coal column under the coupling of the factors such as long-term concentrated stress, water in gob area and spontaneous combustion, from outward appearance to inner essence can there is creep rupture, and then make that its effective bearing area reduces gradually, intensity weakens gradually, and cause the distribution again of concentrated stress and reduce to leave over the width in coal column elastic kernel district further.When the effective bearing area leaving over coal column continues to be reduced to its ultimate bearing area, instantaneous fall damage will be there is.Now, the destruction wave that the instantaneous unstability leaving over coal column produces may shift and be diffused into contiguous coal column, the unstable failure leaving over coal column group " dominoes " formula may be caused, and then cause the dynamic disasters such as bump, and bring the damage of subsidence and building, railway and water body etc.
To sum up, need badly and find a kind of safety, science, the efficiently residual exploiting field of second mining leave over the method for coal column, and then prevent barrier system exploitation from leaving over the generation of coal column dynamic disaster under long-term creep effect, and make full use of and leave over coal resources to slow down the contradiction become increasingly conspicuous between coal resources finiteness and consumption demand unlimitedness thereof.
Summary of the invention
The present invention aims to provide the method that coal column is left in the other residual exploiting field of bilateral part filling second mining of a kind of post, and then the generation of the dynamic disaster such as instantaneous unstability that coal column occurs under long-term creep effect or " dominoes " unstability that effectively prevents barrier system exploitation from leaving over, make full use of and leave over coal resources to improve coal resources recovery ratio, enterprise economic benefit, extend mine service-life, to promote sustainable development.
The present invention is achieved by the following technical solutions:
In exploration, the method that coal column is left in the other residual exploiting field of bilateral part filling second mining of a kind of post finds out that residual exploiting field is left on the basis of coal column and post exploiting field territory distributing position and size etc., adopt the method for segmentation post other bilateral part filling successively side Hu Can leave over coal column in exploiting field, then in the other bilateral obturation of post, tunnel haulage gate and air return way, and arrange that coal column is left in the short arm mechanized residual exploiting field of work plane second mining.Described technical scheme is specifically carried out according to following steps:
(1) in conjunction with the original geology of mine, technical data, exploration finds out that the distributing position in coal column and territory, post exploiting field is left in residual exploiting field, draw the distributional pattern figure that coal column and territory, post exploiting field are left in residual exploiting field, that understands territory, post exploiting field overlying strata is caving situation, and in investigation territory, post exploiting field, mine water gathers and deposits situation with the tax of pernicious gas;
(2) according to certain concentration preparation filling slurries or lotion, under the effect of filling pump, adopt the mode of post other bilateral part filling slurries or lotion evenly to be injected the territory, post exploiting field of abandoned coal pillar both sides, after its setting and hardening, leave over coal column to residual exploiting field produce side and protect effect, and to reduce in territory, post exploiting field mine water and pernicious gas to the threat of safe second mining;
(3) treat post other bilateral obturation setting and hardening reach stable after, along the edge leaving over coal column, in the other bilateral obturation of post, tunnel haulage gate and air return way successively, the transportation system making formation complete and ventilation system;
(4) arrange short arm mechanized second mining work plane, adopt retrusive caving method or the residual exploiting field of retrusive filling method second mining to leave over coal column;
(5) treat to leave over coal pillar mining in step (4) complete, repeat the construction technology of step (2) ~ (4), adopt the mode of post other bilateral part filling to enrich territory, adjacent posts exploiting field successively, and second mining vicinity leaves over coal column gradually.
Preferably, described step (1) combines the original geology of investigation mine, technical data, adopt three-dimensional laser scanner exploration find out residual exploiting field leave over coal column width, highly, distributed areas and unstability situation thereof, understand the distribution orientation in territory, post exploiting field, size, volume and overlying strata thereof and be caving situation, explored gathering of mine water in the method investigation territory, post exploiting field combined by prospecting by boring, physical prospecting or chemistry and deposit situation with the tax of pernicious gas.
Preferably, described residual exploiting field leave over coal column comprise border coal column, safety pillar, structure coal column, section coal pillar and knife mining, Striping noise and room mining leave over coal column.
Preferably, in described step (1), the width of coal column is left in residual exploiting field is 8m-80m, and the width in territory, post exploiting field is 20m-120m.
Preferably, in described step (2), adopt the method side of grouting filling to protect when existing in territory, post exploiting field and being caving spoil accumulation and leave over coal column, when leaving over coal column without adopting the method side of paste body filling to protect when being caving spoil accumulation in territory, post exploiting field.
Preferably, in described step (2), fill paste is gangue/discarded concrete according to mass percent: flyash: cement: high-efficiency water-reducing agent of poly-carboxylic acid: the proportions of water=45%-55%:15%-20%:10%-15%:3%-5%:15%-25% forms, its concentration is 60%-85%, filling slurries are gangue/discarded concrete according to mass percent: flyash: cement: high-efficiency water-reducing agent of poly-carboxylic acid: the proportions of water=25%-35%:25%-30%:20%-25%:3%-5%:15%-25% forms, and its concentration is 25%-50%.
Preferably, the width of the other bilateral obturation of described step (2) center pillar is that 1/4-3/4 of peak width adopted by residual exploiting field post.
Preferably, intensity after described step (2) center pillar other bilateral obturation setting and hardening is 5-20MPa, can not only ensure residual exploiting field leave over coal column second mining after stope rock stratum there is not larger movements and deformations, and be easy to cut driving to form haulage gate and air return way as early as possible.
Preferably, in described step (3), when the surface movement and deformation amount caused after crossheading driving and coal column second mining is less than building permission earth's surface deflection, the residual exploiting field of retrusive caving method second mining is adopted to leave over coal column; When the surface movement and deformation amount caused after crossheading driving and coal column second mining is greater than building permission earth's surface deflection, the residual exploiting field of retrusive filling method second mining is adopted to leave over coal column.
Of the present invention
beneficial effect:
In exploration, this invention finds out that residual exploiting field is left on the basis of coal column and post exploiting field territory distributing position and size etc., adopt the method for segmentation post other bilateral part filling successively side Hu Can leave over coal column in exploiting field, in the other bilateral obturation of post, tunnel haulage gate and air return way, and arrange that coal column is left in the short arm mechanized residual exploiting field of work plane second mining.This invention takes full advantage of residual exploiting field and leaves over coal column, not only slow down the contradiction of coal resources finiteness and consumption demand unlimitedness thereof, and avoid the generation that the dynamic disasters such as instantaneous unstability that coal column occurs under long-term creep effect or " dominoes " unstability are left in barrier system exploitation, also utilize the other bilateral obturation of post to ensure that the safe second mining of coal column is left in residual exploiting field simultaneously.
Accompanying drawing explanation
Fig. 1 is that coal column and territory, post exploiting field distributional pattern figure are left in residual exploiting field;
Fig. 2 is that coal column post other bilateral part filling schematic diagram is left in residual exploiting field
Fig. 3 is that in the other bilateral obturation of post, haulage gate and air return way arrange schematic diagram;
Fig. 4 is that coal column shortwall second mining work plane layout schematic diagram is left in residual exploiting field;
Fig. 5 is that coal column schematic diagram is left in the other residual exploiting field of bilateral part filling second mining of post.
In figure: 1-leave over coal column; Territory, 2-post exploiting field; The other bilateral obturation of 3-post; 4-air return way; 5-haulage gate; 6-short arm mechanized second mining work plane.
Detailed description of the invention
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Xishan coal electricity group Bai Jiazhuan colliery is the typical old ore deposit of resource scarcity type, is faced with constant rate of production, boosts productivity and the problems such as economic benefit.The nineties in 20th century, No. 8, Bai Jiazhuan colliery coal seam 38502(2), 38502(3), 38502(4) and 38502(5) work plane adopt tool post method to exploit respectively, make to leave in a large number staying to establish and adopting with abandoning of coal column.The residual exploiting field of tool post formula, No. 8 coal seams is left over coal column and is had good extraction value, more and more becomes the focus that numerous researchers and engineers and technicians pay close attention in recent years.The second mining of coal column is left in residual exploiting field, not only can recycle valuable coal resources, and can avoid leaving over the generation of the dynamic disasters such as instantaneous unstability that coal column occurs under long-term creep effect or " dominoes " unstability.For above-mentioned situation, below in conjunction with accompanying drawing, implementation process of the present invention is described in further detail.
Step one, in conjunction with the original geology in Bai Jiazhuan colliery, technical data, the result according to three-dimensional laser scanner exploration is known: leave over coal column 1 in 38502 residual exploiting fields and territory, post exploiting field 2 is alternately uniformly distributed, the width leaving over coal column 1 is 8m, be highly 3.8m, stability is better; Territory, post exploiting field 2 width be 24m, highly for 3.8m, overlying strata immediate roof generation inbreak.Draw the distributional pattern figure that coal column 1 and territory, post exploiting field 2 are left in the residual exploiting field of tool post formula, No. 8 coal seams 38502, Bai Jiazhuan colliery, as shown in Figure 1.
Step 2, in the territory, post exploiting field, No. 8 coal seam tool post formula residual exploiting fields, colliery, the method dialogue man village 2 adopting prospecting by boring, physical prospecting or chemistry exploration to combine, mine water gathers and investigates with the tax situation of depositing of pernicious gas, result shows containing a small amount of mine water in territory, post exploiting field, residual exploiting field, and pernicious gas mainly accumulates in the corner place of territory, post exploiting field overlying strata.
Step 3, the situation that is caving according to territory 2, the post exploiting field overlying strata of step one investigation is known, there is not inbreak in territory 2, post exploiting field, No. 8 coal seam tool post formula residual exploiting fields, Bai Jiazhuan colliery overlying strata, namely piles up without being caving spoil in territory, post exploiting field 2, therefore adopt the method for paste body filling to enrich territory, post exploiting field 2.Be gangue/discarded concrete according to mass percent: flyash: cement: high-efficiency water-reducing agent of poly-carboxylic acid: the ratio of water=50%:15%:15%:5%:15%, compound concentration is the fill paste of 70%.
Step 4, under the effect of filling pump, the fill paste prepared in step 3 is evenly injected the territory, post exploiting field 2 that coal column 1 both sides are left in residual exploiting field, No. 8 coal seams, post other bilateral obturation width is 2/3 of territory 2, post exploiting field, residual exploiting field width, i.e. 16m, makes it spread substantial, produces side and protects effect gradually to leaving over coal column 1 in the 38502 residual exploiting fields of tool post formula, and to reduce in territory, post exploiting field 2 mine water and pernicious gas to the threat of safe second mining, as shown in Figure 2.
Step 5, treat step 4 center pillar other bilateral obturation setting and hardening reach stable after, along the edge leaving over coal column 1, air return way 4 and haulage gate 5 is tunneled successively in the other bilateral obturation of post, crossheading width is 6.8m, the transportation system making formation complete and ventilation system, as shown in Figure 4.
Step 6, arranges short arm mechanized second mining work plane 6, adopts retrusive caving method to leave over coal column 1 in the residual exploiting field of second mining gradually.
Step 7, to treat in step 6 that coal column 1 is left in residual exploiting field and exploits complete, repeat step 3, four, the construction technology of five, adopt the mode of post other bilateral part filling to protect and contiguously leave over coal column in side successively, and extraction is abandoned and is adopted coal resources gradually.
The above is the preferred embodiment of the present invention, it should be pointed out that any improvement of making above-mentioned implementation method under the prerequisite not departing from technical spirit of the present invention and principle and polishs, and all belongs to the protection domain of technical solution of the present invention.
Claims (9)
1. a method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post, it is characterized in that, comprises the following steps:
(1) in conjunction with the original geology of mine, technical data, exploration finds out that the distributing position in coal column and territory, post exploiting field is left in residual exploiting field, draw the distributional pattern figure that coal column and territory, post exploiting field are left in residual exploiting field, that understands territory, post exploiting field overlying strata is caving situation, and in investigation territory, post exploiting field, mine water gathers and deposits situation with the tax of pernicious gas;
(2) filling slurries or lotion is prepared, under the effect of filling pump, adopt the mode of post other bilateral part filling slurries or lotion evenly to be injected the territory, post exploiting field of abandoned coal pillar both sides, after its setting and hardening, leave over coal column to residual exploiting field produce side and protect effect, and to reduce in territory, post exploiting field mine water and pernicious gas to the threat of safe second mining;
(3) treat post other bilateral obturation setting and hardening reach stable after, along the edge leaving over coal column, in the other bilateral obturation of post, tunnel haulage gate and air return way successively, the transportation system making formation complete and ventilation system;
(4) arrange short arm mechanized second mining work plane, adopt retrusive caving method or the residual exploiting field of retrusive filling method second mining to leave over coal column;
(5) treat to leave over coal pillar mining in step (4) complete, repeat the construction technology of step (2) ~ (4), adopt the mode of post other bilateral part filling to enrich territory, adjacent posts exploiting field successively, and second mining vicinity leaves over coal column gradually.
2. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, it is characterized in that, described step (1) combines the original geology of investigation mine, technical data, adopt three-dimensional laser scanner exploration find out residual exploiting field leave over coal column width, highly, distributed areas and unstability situation thereof, understand the distribution orientation in territory, post exploiting field, size, volume and overlying strata thereof and be caving situation, explored gathering of mine water in the method investigation territory, post exploiting field combined by prospecting by boring, physical prospecting or chemistry and deposit situation with the tax of pernicious gas.
3. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, it is characterized in that, described residual exploiting field leave over coal column comprise border coal column, safety pillar, structure coal column, section coal pillar and knife mining, Striping noise and room mining leave over coal column.
4. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, and it is characterized in that, in described step (1), the width of coal column is left in residual exploiting field is 8m-80m, and the width in territory, post exploiting field is 20m-120m.
5. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, it is characterized in that, in described step (2), adopt the method side of grouting filling to protect when existing in territory, post exploiting field and being caving spoil accumulation and leave over coal column, when leaving over coal column without adopting the method side of paste body filling to protect when being caving spoil accumulation in territory, post exploiting field.
6. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, it is characterized in that, in described step (2), fill paste is gangue/discarded concrete according to mass percent: flyash: cement: high-efficiency water-reducing agent of poly-carboxylic acid: the proportions of water=45%-55%:15%-20%:10%-15%:3%-5%:15%-25% forms, its concentration is 60%-85%, filling slurries are gangue/discarded concrete according to mass percent: flyash: cement: high-efficiency water-reducing agent of poly-carboxylic acid: the proportions of water=25%-35%:25%-30%:20%-25%:3%-5%:15%-25% forms, its concentration is 25%-50%.
7. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, it is characterized in that, the width of the other bilateral obturation of described step (2) center pillar is that 1/4-3/4 of peak width adopted by residual exploiting field post.
8. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, it is characterized in that, intensity after described step (2) center pillar other bilateral obturation setting and hardening is 5-20MPa, can not only ensure residual exploiting field leave over coal column second mining after stope rock stratum there is not larger movements and deformations, and be easy to cut driving to form haulage gate and air return way as early as possible.
9. the method for coal column is left in the other residual exploiting field of bilateral part filling second mining of post according to claim 1, it is characterized in that, in described step (3), when the surface movement and deformation amount caused after crossheading driving and coal column second mining is less than building permission earth's surface deflection, the residual exploiting field of retrusive caving method second mining is adopted to leave over coal column; When the surface movement and deformation amount caused after crossheading driving and coal column second mining is greater than building permission earth's surface deflection, the residual exploiting field of retrusive filling method second mining is adopted to leave over coal column.
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Cited By (8)
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| CN107237634A (en) * | 2017-06-29 | 2017-10-10 | 中国矿业大学 | A kind of resource exhaustion mine block leaves coal column classified reclaiming method |
| CN107780936A (en) * | 2017-09-29 | 2018-03-09 | 大同煤矿集团有限责任公司 | A kind of high seam loses coal second mining technique |
| CN109577981A (en) * | 2018-11-15 | 2019-04-05 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of high seam pillar recovery method |
| CN110230493A (en) * | 2019-05-27 | 2019-09-13 | 太原理工大学 | A kind of corner cut destruction methods for leaving coal column |
| CN112963196A (en) * | 2021-03-15 | 2021-06-15 | 中国煤炭科工集团太原研究院有限公司 | Filling mining method for protecting coal pillars between lanes |
| CN114165280A (en) * | 2021-11-03 | 2022-03-11 | 李龙清 | Column type goaf filling reconstruction coal seam comprehensive mechanical stoping method |
| WO2023029618A1 (en) * | 2021-08-30 | 2023-03-09 | 中国矿业大学 | Overlying strata isolation grouting filling green mining method for coal gangue in high-strength mining working surface |
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