CN112112668A - Gob-side entry retaining gob gangue blocking closed structure and manufacturing method thereof - Google Patents
Gob-side entry retaining gob gangue blocking closed structure and manufacturing method thereof Download PDFInfo
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- CN112112668A CN112112668A CN202011026872.7A CN202011026872A CN112112668A CN 112112668 A CN112112668 A CN 112112668A CN 202011026872 A CN202011026872 A CN 202011026872A CN 112112668 A CN112112668 A CN 112112668A
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000010410 layer Substances 0.000 claims abstract description 75
- 239000004744 fabric Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000010878 waste rock Substances 0.000 claims abstract description 14
- 239000003566 sealing material Substances 0.000 claims abstract description 13
- 239000011241 protective layer Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000005507 spraying Methods 0.000 claims description 25
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 23
- 239000004746 geotextile Substances 0.000 claims description 18
- 238000005065 mining Methods 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 7
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 6
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000007799 cork Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 6
- 230000003014 reinforcing effect Effects 0.000 description 17
- 229910000720 Silicomanganese Inorganic materials 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 230000002265 prevention Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002356 single layer Substances 0.000 description 2
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a gob-side entry retaining gob gangue blocking closed structure and a manufacturing method thereof, and belongs to the technical field of mine safety. The invention discloses a waste rock blocking closed structure of a gob-side entry retaining goaf, which comprises an inner layer, a supporting layer and a protective layer, wherein the inner layer, the supporting layer and the protective layer are tightly attached from inside to outside; the inner layer comprises a first net layer and a second net layer, and a cloth layer is arranged between the first net layer and the second net layer; the supporting layer comprises a plurality of supporting columns, the supporting columns are compacted on the second net layer, and two ends of each supporting column are respectively embedded into the roadway top plate and the roadway bottom plate; the cloth layer, the second net layer and the support are all coated with protective layers which are inorganic sealing materials. The invention also discloses a manufacturing method of the gob-side entry retaining goaf waste rock blocking structure, wherein sheet materials are cut according to the size of the section of the reserved roadway, and the gob-side entry retaining goaf waste rock blocking structure is manufactured through a convenient and feasible manufacturing method. The invention provides an effective construction method for the problem of air leakage, gas leakage and the like in the gob roadway of the gob side without pillars through waste rock blocking and sealing at the gob roadway side.
Description
Technical Field
The invention belongs to the technical field of mine safety, and relates to a gob-side entry retaining goaf gangue blocking closed structure and a manufacturing method thereof.
Background
The invention discloses a novel gangue blocking closed structure for reinforcing gob-side entry retaining gas control and fire prevention management, which is characterized in that gangue blocking support is required to be carried out on the side of an entry retaining goaf due to the particularity of an entry retaining process of a coal-pillar-free gob-side entry retaining tunnel, the existing gangue blocking support has poor effect, so that a goaf is communicated with gas of the retained roadway, and the phenomena of air leakage and gas leakage in the roadway are caused, so that underground fire prevention and extinguishing work development and goaf gas control are not facilitated.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a gob-side entry retaining gob gangue blocking closed structure and a manufacturing method thereof. The problems of air leakage, gas leakage and other gas disasters in the goaf roadway of the gob-side entry retaining without the coal pillar are solved, the effects of gangue blocking and air leakage of the side wall of the goaf reserved roadway of the gob-side entry retaining without the coal pillar can be effectively improved, and the development of underground fire prevention and extinguishing and gas control work is facilitated.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a waste rock blocking closed structure of a gob-side entry retaining goaf, which comprises an inner layer, a supporting layer and a protective layer, wherein the inner layer, the supporting layer and the protective layer are tightly attached and connected from inside to outside;
the inner layer comprises a first net layer and a second net layer, and a cloth layer is arranged between the first net layer and the second net layer; the supporting layer comprises a plurality of supporting columns, the supporting columns are compacted on the second net layer, and two ends of each supporting column are respectively embedded into the roadway top plate and the roadway bottom plate; the cloth layer, the second net layer and the support are all coated with protective layers which are inorganic sealing materials.
Preferably, the first net layer is a reinforcing mesh with the diameter of 6.5mm, the second net layer is a No. 10 galvanized lead wire mesh, the cloth layer is anti-wind-leakage earth work cloth, the support is a silicon-manganese steel seamless steel pipe, and the inorganic sealing material is a Cork-coated inorganic flexible spraying material.
Preferably, the row pitch of the struts is 50cm to 80 cm.
Preferably, the upper end of the pillar is provided with a pillar tray, and the lower end of the pillar is provided with a pillar base.
Further preferably, anti-slip rings are arranged on the pillar tray and the pillar base.
The invention also discloses a manufacturing method of the gob-side entry retaining goaf gangue blocking closed structure, which comprises the following steps:
1) cutting a plurality of sheet-shaped meshes and cloth pieces which are matched with the height of the section of the roadway according to the size of the section of the roadway;
2) hanging a first net sheet along the direction of the roadway, wherein the first net sheet is closely connected with a roadway top plate and a roadway bottom plate; hanging the geotextile on the first net sheet; hanging a second net sheet along the direction of the roadway, closely attaching the second net sheet to the geotextile, and closely connecting the second net sheet with the roadway top plate and the roadway bottom plate;
3) a plurality of pillars are compacted on the second net piece, and both ends of the pillars are embedded into the roadway top plate and the roadway bottom plate;
4) and coating an inorganic sealing material on the surface, and after the inorganic sealing material is dried in the air, carrying out re-spraying on the upper and lower shoulder corners and the local cracking position of the roadway.
Preferably, in the step 1), the height of the cut cloth piece is 40-50 cm greater than the height of the mining side of the reserved roadway.
Preferably, the first net piece is hung in the position of 2-3 m of the lagging coal-pillar-free gob-side entry retaining working face along the direction of the roadway.
Preferably, the length of the support is 40-50 cm greater than the height of the mining side of the reserved roadway.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a gob-side entry retaining goaf gangue blocking closed structure, which is characterized in that a first net layer is arranged to provide basic strength support and prevent the problems of rock sliding and the like; a double-layer net is formed by the first net layer and the second net layer, and a cloth layer is clamped between the double net layers, so that the strength effect and the sealing property are improved; the plurality of support columns are continuously and tightly compacted on the surface of the second net layer, so that the hanging net of the cloth layer is prevented from falling off, and the strength and the stability are improved; through the inorganic sealing material who sets up the top layer to cloth layer through between the double-network layer provides effective support for inorganic sealing material, when increasing overall structure's windbreak and leakproofness, plays the guard action to structure itself, has increased gob entry collecting space area keeps off the life of cash enclosed construction. Therefore, the gob-side entry retaining gob gangue blocking closed structure disclosed by the invention can solve the problems of side air leakage and gas leakage of a gob-side entry retaining roadway without coal pillars, and has a prominent blocking effect and sealing property compared with the traditional gob-side entry retaining gob-side single-layer net gangue blocking structure.
Furthermore, through selecting specific materials, the gangue blocking and leaking stoppage wind of the gangue blocking closed structure of the gob-side entry retaining gob can be enhanced. Wherein, the fixed geotechnological cloth that double-deck net cooperation was used can be better, and first layer reinforcing bar net intensity is better, and the less cooperation geotechnological cloth of second layer lead wire net mesh is convenient for show the bonding of spraying inorganic material.
Furthermore, the row spacing is selected to be 50-80 cm, and the row spacing can be properly adjusted according to the condition of waste rock caving at the side of the mining area and the pressure of a top plate, so that the supporting strength is increased, and the supporting materials are saved.
Furthermore, the anti-slip rings are arranged on the support tray and the support base, so that the gangue blocking strength of the whole structure is enhanced.
The invention also discloses a manufacturing method of the gob-side entry retaining goaf waste rock blocking closed structure, a set of complete coal-pillar-free gob-side waste rock blocking closed system is formed by the manufacturing method, the manufacturing method is convenient and easy to implement, the existing construction process is simplified, and the safety of the underground operation space is improved.
Drawings
FIG. 1 is a flow chart of the gangue blocking and sealing construction process of the invention;
FIG. 2 is a partial enlarged view of an inner layer in the gob-side entry retaining gob gangue blocking closed structure of the invention;
FIG. 3 is a schematic diagram showing the distribution structure of the seamless Si-Mn steel pipe and No. 10 galvanized lead wire mesh sheet according to the present invention;
FIG. 4 is a schematic view of a support pallet of the present invention;
FIG. 5 is a schematic view of a pillar base of the present invention.
Wherein: a reinforcing mesh with the diameter of 1-phi 6.5 mm; 2-air leakage prevention geotextile; 3-10# galvanized lead wire mesh; 4-silicomanganese steel seamless steel pipe; 5-a post tray; 6-a pillar base; 7-slip-preventing ring.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention discloses a coal-pillar-free gob-side entry retaining goaf gangue blocking closed structure which comprises an inner layer, a supporting layer and a protective layer, wherein the inner layer, the supporting layer and the protective layer are tightly attached and connected from inside to outside; the supporting layer comprises a plurality of supporting columns, the supporting columns are compacted on the second net layer, and two ends of each supporting column are respectively embedded into the roadway top plate and the roadway bottom plate; the cloth layer, the second net layer and the support are all coated with protective layers which are inorganic sealing materials. Wherein, the pillar upper end is equipped with pillar tray 5, and the pillar lower extreme is equipped with pillar base 6, and it can be known to see fig. 4 and 5, all is equipped with anti-skidding ring 7 on tray and the base.
Specifically, in this embodiment, as can be seen from fig. 2 and 3, the reinforcing mesh 1 with a diameter of 6.5mm is used as the first mesh layer, the 10# galvanized lead wire mesh 3 is used as the second mesh layer, the air leakage preventing geotextile 2 is used as the cloth layer, and the silicon manganese steel seamless steel tube 4 is used as the support. Therefore, the anti-air leakage geotextile 2 is arranged between the phi 6.5mm reinforcing mesh 1 and the No. 10 galvanized lead wire mesh 3, the plurality of silicomanganese steel seamless steel pipes 4 are compacted on the outer surface of the No. 10 galvanized lead wire mesh 3, and two ends of the silicomanganese steel seamless steel pipes 4 are respectively embedded into the roadway top plate and the roadway bottom plate.
Specifically, in the present embodiment, an inorganic flexible spray material is applied as an inorganic sealing material.
Based on the gob-side entry retaining gob gangue blocking closed structure, the invention also discloses a manufacturing method of the gob-side entry retaining gob gangue blocking closed structure. Firstly, the structure is constructed by a row of silicon-manganese steel seamless steel tubes 4 on the basis of clamping an anti-air leakage geotextile 2 to block waste rock on a double-layer net (phi 6.5mm reinforcing mesh 1+10# galvanized lead wire net 3), and finally, a novel thin spraying material (an inorganic flexible spraying material is coated on the surface of the steel tube) for sealing after air blocking and waste rock blocking measures are finished.
Aiming at the problems of side air leakage and gas leakage of the goaf of the coal-pillar-free gob-side entry retaining roadway, the gangue blocking structure of the goaf-side gob-side entry retaining roadway is improved to be that a steel bar mesh 1 with the diameter of 6.5mm, an anti-air leakage geotextile 2 and a 10# galvanized lead wire mesh 3 are used for blocking gangue on the basis of the conventional gangue blocking of a single-layer mesh beside the goaf side, a row of silicon-manganese steel seamless steel tubes 4 are constructed outside the 10# galvanized lead wire mesh 3, the top and bottom ends of the roadway are embedded into the top and bottom plates of the roadway, and the 10# galvanized lead wire mesh 3 is compacted to prevent the hanging mesh from falling off. After the gangue blocking construction is finished, a novel thin spraying material (an inorganic flexible spraying material is applied by plugging) is sprayed on the surface for plugging and sealing.
The manufacturing method specifically comprises the following steps of:
a method for manufacturing a goaf gangue blocking closed structure of a coal-pillar-free gob-side entry retaining is manufactured by two parts of net hanging gangue blocking and airtight spraying.
Firstly, hanging and fixing a phi 6.5mm reinforcing mesh 1 along the roadway at a position 2-3 m along the working face of the gob-side entry retaining of the lagging coal-free column, then hanging and fixing an anti-air-leakage geotextile 2 (fire-proof) on the phi 6.5mm reinforcing mesh 1, and constructing a 10# galvanized lead wire mesh 3 outside the anti-air-leakage geotextile and fixing the mesh with the phi 6.5mm reinforcing mesh 1 and the roadway top and bottom plates. And constructing a row of silicomanganese steel seamless steel pipes outside the fixed 10# galvanized lead wire mesh 3, embedding both ends of the silicomanganese steel seamless steel pipes into a roadway top bottom plate, and closely contacting the silicomanganese steel seamless steel pipes with the 10# galvanized lead wire mesh 3. And finally spraying a layer of novel thin spraying material (inorganic flexible spraying material applied by a cork), and after air drying, re-spraying the anchor rod (cable), the top, the bottom and the crack.
In practical use, for the long-distance roadway length, the matching extension and use of the gob-side entry retaining goaf gangue blocking closed structure disclosed by the invention can be directly realized through splicing.
With reference to fig. 1, the manufacturing method of the gangue blocking closed structure of the gob-side entry retaining goaf without the coal pillar, disclosed by the invention, comprises the following steps:
the method comprises the following steps: cutting a plurality of sheet-shaped reinforcing meshes 1 with the diameter of 6.5mm, a No. 10 galvanized lead wire mesh 3 and anti-air-leakage geotextile 2 according to the size of the section of the roadway; the height of the cut anti-air leakage geotextile 2 is 40cm greater than the mining side height of the reserved roadway;
step two: firstly, hanging a phi 6.5mm reinforcing mesh 1 along the trend of a roadway, and compactly connecting two ends of the phi 6.5mm reinforcing mesh 1 with a roadway top bottom plate;
step three: hanging the cut pieces of the air leakage-proof geotextile 2 on a reinforcing mesh 1 with the diameter of 6.5mm, and embedding the cut pieces of the air leakage-proof geotextile with the length of 20-25 cm into the reinforcing mesh 1 with the diameter of 6.5 mm; (when cutting, the height of the cloth piece is 40-50 cm higher than the mining side height of the reserved roadway)
Step four: tightly attaching the cut pieces of the 10# galvanized lead wire mesh 3 to the anti-air leakage geotextile 2, and hanging the cut pieces along the direction of the roadway, wherein two ends of the 10# galvanized lead wire mesh 3 are closely connected with the top bottom plate of the roadway;
step five: after the hanging is finished, cutting the silicomanganese steel pillar into a steel pipe workpiece with the length of 40-50 cm larger than the mining side of the reserved roadway, namely a silicomanganese steel seamless steel pipe 4, and welding a pillar base 6 and a pillar tray 5 at two ends of the silicomanganese steel seamless steel pipe 4; compacting the prefabricated silicomanganese steel seamless steel pipe 4 on the No. 10 galvanized lead wire mesh 3 at a row spacing of 50-80 cm, and embedding two ends of the prefabricated silicomanganese steel seamless steel pipe into a roadway top bottom plate;
step six: after the steps are completed, spraying a layer of novel thin spraying material (inorganic flexible spraying material) on the No. 10 galvanized lead wire mesh 3 at the outermost side, and after the spraying layer is dried in the air, re-spraying the anchor rod, the anchor cable and the upper and lower shoulder corners and the local cracking positions of the roadway;
the spraying material used in the first spraying and the second spraying in the process is an inorganic flexible spraying material for scientific plugging, has no any volatile harmful substance, and has high tensile strength, large deformation, strong caking property, quick hardening and excellent sealing property.
In summary, the invention provides a goaf waste rock blocking and sealing structure and a manufacturing method for the gas disaster problems of air leakage, gas leakage and the like in a goaf roadway without a coal pillar, according to the reserved roadway section size, a plurality of sheet-shaped reinforcing meshes 1 with the diameter of 6.5mm, galvanized lead wire mesh sheets 3 with the diameter of 10# and air leakage-proof geotextiles 2 are cut, and the method of 'reinforcing meshes 1 with the diameter of 6.5mm, galvanized lead wire meshes 1 with the air leakage-proof geotextiles 2+10# and galvanized lead wire meshes 3+ silicon manganese steel seamless steel pipes 4+ flexible spraying sealing of goafs (scientific plugging and applying inorganic flexible spraying materials)' is used for carrying out waste rock blocking and sealing beside a mining roadway, so that an effective construction method is provided for the gas communication problems of air leakage, gas leakage and the like in the goaf roadway without the coal pillar and the goaf roadway without the gob, and the problems of air leakage and gas leakage and the like are favorably solved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A gob-side entry retaining goaf waste rock blocking closed structure is characterized by comprising an inner layer, a supporting layer and a protective layer which are tightly attached and connected from inside to outside;
the inner layer comprises a first net layer and a second net layer, and a cloth layer is arranged between the first net layer and the second net layer; the supporting layer comprises a plurality of supporting columns, the supporting columns are compacted on the second net layer, and two ends of each supporting column are respectively embedded into the roadway top plate and the roadway bottom plate; the cloth layer, the second net layer and the support are all coated with protective layers which are inorganic sealing materials.
2. The gob-side entry retaining gob gangue blocking closed structure according to claim 1, wherein the first mesh layer is a steel bar mesh with a diameter of 6.5mm, the second mesh layer is a 10# galvanized lead wire mesh, the cloth layer is an anti-wind soil engineering cloth, the pillars are silicon manganese steel seamless pipes, and the inorganic sealing material is a Cork-coated inorganic flexible spraying material.
3. The gob-side entry retaining gob gangue blocking closed structure according to claim 1, wherein a row pitch of the pillars is 50cm to 80 cm.
4. The gob-side entry retaining gob gangue blocking closed structure according to claim 1, wherein a pillar pallet is provided at an upper end of the pillar, and a pillar base is provided at a lower end of the pillar.
5. The gob-side entry retaining gob waste rock blocking closed structure according to claim 4, wherein the pillar pallet and the pillar base are each provided with an anti-slip ring.
6. The manufacturing method of the gangue blocking closed structure of the gob-side entry retaining gob, which is described in any one of claims 1 to 5, is characterized by comprising the following steps:
1) cutting a plurality of sheet-shaped meshes and cloth pieces which are matched with the height of the section of the roadway according to the size of the section of the roadway;
2) hanging a first net sheet along the direction of the roadway, wherein the first net sheet is closely connected with a roadway top plate and a roadway bottom plate; hanging the geotextile on the first net sheet; hanging a second net sheet along the direction of the roadway, closely attaching the second net sheet to the geotextile, and closely connecting the second net sheet with the roadway top plate and the roadway bottom plate;
3) a plurality of pillars are compacted on the second net piece, and both ends of the pillars are embedded into the roadway top plate and the roadway bottom plate;
4) and coating an inorganic sealing material on the surface, and after the inorganic sealing material is dried in the air, carrying out re-spraying on the upper and lower shoulder corners and the local cracking position of the roadway.
7. The manufacturing method of claim 6, wherein in the step 1), the height of the cut cloth piece is 40-50 cm greater than the height of the goaf side of the reserved roadway.
8. The manufacturing method of claim 6, wherein the first mesh is hung along the roadway at a position 2-3 m along the roadway working face without the lagging coal pillar.
9. The manufacturing method of claim 6, wherein the length of the support is 40-50 cm greater than the mining side height of the reserved roadway.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113417696A (en) * | 2021-07-22 | 2021-09-21 | 华晋焦煤有限责任公司 | Gob-side entry retaining lane sealing device |
| CN116165071A (en) * | 2023-04-21 | 2023-05-26 | 中国矿业大学(北京) | Rock breaking and expanding characteristic test system and method |
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| CN116165071A (en) * | 2023-04-21 | 2023-05-26 | 中国矿业大学(北京) | Rock breaking and expanding characteristic test system and method |
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Application publication date: 20201222 |