CN113550763B - Supporting structure for quickly constructing gob-side entry retaining and construction method thereof - Google Patents
Supporting structure for quickly constructing gob-side entry retaining and construction method thereof Download PDFInfo
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- CN113550763B CN113550763B CN202110976962.0A CN202110976962A CN113550763B CN 113550763 B CN113550763 B CN 113550763B CN 202110976962 A CN202110976962 A CN 202110976962A CN 113550763 B CN113550763 B CN 113550763B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21F17/18—Special adaptations of signalling or alarm devices
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention provides a supporting structure for quickly constructing a gob-side entry retaining and a construction method thereof, wherein the supporting structure comprises a first groove arranged at the top of an upper supporting block, a second groove arranged at the middle part of the supporting block, and a plurality of third grooves arranged at the bottom of the supporting block; the top of the lower supporting block is provided with a plurality of fourth grooves; the plurality of connecting ribs are arranged, the top ends of the connecting ribs are inserted into the third grooves, and the bottom ends of the connecting ribs are inserted into the fourth grooves; the middle supporting blocks are symmetrically arranged between the upper supporting block and the lower supporting block respectively, the supporting strength of the two middle supporting blocks is lower than that of the upper supporting block and the lower supporting block, a plurality of arc grooves are formed in each middle supporting block, the two arc grooves which are oppositely arranged are spliced and then are nested on the connecting ribs, and the invention further provides a construction method for quickly constructing the supporting structure of the gob-side entry retaining. The invention improves the construction speed of the gob-side entry retaining, improves the working conditions of underground gob-side entry retaining construction workers, improves the gob-side entry retaining operation efficiency and reduces the gob-side entry retaining construction cost.
Description
Technical Field
The invention belongs to the technical field of coal mining equipment, and particularly relates to a supporting structure for quickly constructing a gob-side entry retaining device and a construction method thereof.
Background
Coal mine longwall mining is generally carried out by reserving coal pillars between two working surfaces so as to maintain the stability of a stope; however, a plurality of coal pillars are reserved between two working surfaces, so that a great amount of coal resources are wasted, in order to solve the problem caused by using the coal pillars, the coal pillars are gradually replaced by a gob-side entry retaining technology for retaining an upper section stope for lower section stope, and the existing gob-side entry retaining technology mainly comprises the following steps: the method comprises the steps of manufacturing a roadside support shape according to the section size of a roadway by using a high-strength plastic film, injecting mixed filling materials into the flexible plastic film on site, fixing the flexible plastic film by using a back plate, channel steel and the like, and finishing the roadside support after the filling materials are solidified to reach the support strength; although the method can solve the problem of waste of a large amount of coal resources, the method has the problems of long construction time and high construction strength. Therefore, the design of the support structure for quickly constructing the gob-side entry retaining and the construction method thereof has very important significance in reducing the labor intensity of constructing the gob-side entry retaining and the construction time of constructing the gob-side entry retaining support.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the support structure for quickly constructing the gob-side entry retaining and the construction method thereof, which have very important significance in realizing non-coal pillar mining and improving the recovery rate of coal resources.
In order to achieve the above purpose, the technical scheme provided by the invention is a supporting structure for quickly constructing gob-side entry retaining, comprising:
the top of the upper supporting block is provided with a first groove for placing an expanding agent, the middle of the upper supporting block is provided with a second groove for placing a stress strain sensor, and the bottom of the upper supporting block is provided with a plurality of third grooves;
the bottom of the lower supporting block is arranged on the bottom wall of the coal recovery wall, and a plurality of fourth grooves which are in one-to-one correspondence with the third grooves are formed in the top of the lower supporting block;
the plurality of connecting ribs are used for connecting the upper supporting block and the lower supporting block, the top ends of the connecting ribs are inserted into the third grooves, the bottom ends of the connecting ribs are inserted into the fourth grooves, and the bottom ends of the connecting ribs are positioned above the bottom wall of the fourth grooves;
the two middle supporting blocks are symmetrically arranged between the upper supporting block and the lower supporting block respectively, the supporting strength of the two middle supporting blocks is smaller than that of the upper supporting block and that of the lower supporting block, a plurality of arc grooves are formed in the two middle supporting blocks, and the two arc grooves which are arranged on the two middle supporting blocks oppositely are spliced and then are nested on the connecting ribs.
Preferably, the bottom ends of the connecting ribs are all in conical structures.
Preferably, a plurality of strip-shaped blocks are filled in the gaps between the arc-shaped grooves which are nested on the connecting ribs after two splicing and the connecting ribs, and the strip-shaped blocks are made of the same material as the support blocks in preparation.
Preferably, the interval between two adjacent third grooves is 0.75m-0.85m.
Preferably, the bottom surface of the upper support block and the top surface of the lower support block are rectangular.
Preferably, the bottom surface of the upper supporting block and the top surface of the lower supporting block are square, and the side length of the square is 3m-3.5m.
Preferably, the plurality of third grooves are all distributed in a matrix.
A construction method for quickly constructing a supporting structure of a gob-side entry retaining comprises the following steps:
s1: the upper supporting block, the lower supporting block and the middle supporting block are prefabricated in advance according to the section size of the roadway, and the total height of the upper supporting block, the lower supporting block and the middle supporting block after being assembled is 100-150mm lower than that of the gob-side entry retaining;
s2: conveying the upper supporting block, the lower supporting block and the middle supporting block which are prefabricated in the S1 to a position 5-10m in front of a coal mining working face, forming a notch for fixing the lower supporting block at a position 3-5m close to the coal mining working face, fixing the lower supporting block at the notch, inserting the bottom ends of all connecting ribs into all fourth grooves, and inserting the top ends of all connecting ribs into third grooves corresponding to the fourth grooves; at the moment, an upper supporting block is supported by a jack, two middle supporting blocks are respectively pushed into the space between the upper supporting block and the lower supporting block from the left side and the right side, arc grooves formed in the two middle supporting blocks are spliced and sleeved outside connecting ribs, then a plurality of strip-shaped blocks are filled in the arc grooves spliced and sleeved outside the connecting ribs, the jack is removed, and quantitative water is injected into the first groove to expand the expanding agent to be connected with the jack;
s3: along with the advance of working face exploitation, in order to continuously support and seal one side of the goaf, the upper support block, the lower support block and the middle support block are assembled according to the step S2, and are sequentially arranged on one side close to the goaf along the roadway, and a stress strain sensor is arranged in a second groove every 20-100 m.
Preferably, the outer sides of the assembled upper support block, lower support block and middle support block are reinforced by using channel steel connection.
Preferably, the prefabricated upper supporting block and the prefabricated lower supporting block are both prepared from the following raw material components in percentage by mass: 40-50% of gangue, 5-10% of fly ash, 18-25% of cement, 5-10% of sand, 10-15% of stone and 9-15% of water; the prefabricated middle supporting block is prepared from the following raw material components in percentage by mass: 50-55% of gangue, 5-10% of fly ash, 15-20% of cement, 5-10% of sand, 5-10% of stone, 10-15% of water, 1-2% of asbestos gauze and 1-2% of cross-linking agent.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the upper support block, the lower support block and the middle support block are prefabricated on the ground in advance, the prefabricated upper support block, lower support block and middle support block are sent to an operation place, then the upper support block and lower support block are connected through a plurality of connecting ribs, and then the middle support block is nested into the plurality of connecting ribs for further buffering the stress of the plurality of connecting ribs.
Drawings
FIG. 1 is a schematic overall cross-sectional view of a support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 2 is a cross-sectional view of an upper support block of the support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 3 is a schematic view of a connecting rib for quickly constructing a support structure of a gob-side entry retaining according to the present invention;
FIG. 4 is a schematic diagram of a middle support block of the support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 5 is a schematic view of a lower support block of the support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 6 is a schematic view of the bottom of an upper support block of the support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 7 is a top view of an upper support block of the support structure for rapidly constructing a gob-side entry retaining according to the present invention;
FIG. 8 is a schematic diagram of a construction method for rapidly constructing a support structure for gob-side entry retaining according to the present invention;
fig. 9 is a top view of a construction method for quickly constructing a support structure for gob-side entry retaining according to the present invention.
Reference numerals illustrate:
1. the device comprises an upper supporting block, a first groove, a second groove, a third groove, a lower supporting block, a fourth groove, a connecting rib, a middle supporting block, an arc-shaped groove and a stress strain sensor.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement of the purposes and the effects of the present invention easy to understand, 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.
In the description of the present invention, it should be understood that terms used in the description of the subject, such as "height", "length", "width", "front surface", are based on the description provided that the subject is placed vertically, i.e., perpendicular to the ground, merely to facilitate the description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Examples
As shown in fig. 1-9, the specific implementation mode of the invention is realized by adopting the following technical scheme, and the supporting structure for quickly constructing the gob-side entry retaining comprises the following steps:
the top of the upper supporting block 1 is provided with a first groove 2 for placing an expanding agent, the middle of the upper supporting block is provided with a second groove 3 for placing a stress strain sensor 10, and the bottom of the upper supporting block is provided with a plurality of third grooves 4;
the bottom of the lower supporting block 5 is arranged on the bottom wall of the coal recovery wall, and a plurality of fourth grooves 6 which are in one-to-one correspondence with the third grooves 4 are formed in the top of the lower supporting block;
the plurality of connecting ribs 7 are used for connecting the upper supporting block 1 and the lower supporting block 5, the top ends of the connecting ribs 7 are inserted into the third grooves 4, the bottom ends of the connecting ribs 7 are inserted into the fourth grooves 6, and the bottom ends of the connecting ribs 7 are positioned above the bottom wall of the fourth grooves 6;
the two middle supporting blocks 8 are symmetrically arranged between the upper supporting block 1 and the lower supporting block 5 respectively, the supporting strength of the two middle supporting blocks 8 is smaller than that of the upper supporting block 1 and the lower supporting block 5, a plurality of arc grooves 9 are formed in the two middle supporting blocks 8, and the two arc grooves 9 which are oppositely arranged on the two middle supporting blocks 8 are spliced and then are nested on the connecting ribs 7.
Wherein, the opening shapes of the third groove 4 and the fourth groove 6 are consistent with the cross-sectional shape of the connecting rib 7 and the opening shapes of the third groove 4 and the fourth groove 6 and the cross-section of the connecting rib 7 are preferably circular, because the circular shape is most convenient for processing.
The invention provides a supporting structure for quickly constructing a gob-side entry retaining, which adopts a modularized mode to assemble an upper supporting block 1, a middle supporting block 8, a lower supporting block 5 and a plurality of connecting ribs 7 into a supporting structure unit, wherein the strength of the middle supporting block 8 is lower than that of the upper supporting block 1 and the lower supporting block 5, when the supporting structure unit is subjected to roof pressure exceeding the compressive strength of the middle supporting block 8, the middle supporting block 8 deforms, and as the raw material components of the middle supporting block 8 are prepared, the middle supporting block 8 can still maintain the shape integrity after deformation, the upper supporting block 1 can downwards displace along the connecting ribs 7 after deformation of the middle supporting block 8, and the roof generates a certain deformation amount, so that partial mine pressure is released, and the roof pressure and the supporting structure unit again reach force balance. In order to realize continuous advance of the mining face, the supporting structure units are continuously arranged along the goaf, and no gap is reserved between two adjacent supporting structure units.
Further, the bottoms of the connecting ribs 7 are all in a conical structure, and the conical structure is formed because when the pressure born by the top of the upper supporting block 1 is increased, the upper supporting block 1 descends, the middle supporting block 8 deforms, and the change of resistance when the connecting ribs move downwards in the fourth groove 6 of the lower supporting block 5 is guaranteed to be a gradual change process.
Further, a plurality of strip-shaped blocks are filled in gaps between the arc-shaped grooves 9 which are embedded in the connecting ribs 7 after the two arc-shaped grooves are spliced and the connecting ribs 7, and the strip-shaped blocks are made of materials for preparing the middle supporting blocks 8 and are used for increasing friction force and supporting force between each connecting rib 7 and the inserted arc-shaped groove 9.
Further, the spacing between every two adjacent third grooves 4 is 0.75m-0.85m.
Further, the bottom surface of the upper supporting block 1 and the top surface of the lower supporting block 5 are rectangular, and the bottom surface of the upper supporting block 1 and the top surface of the lower supporting block 5 can be set into different shapes according to different mining mines.
Further, the bottom surface of the upper supporting block 1 and the top surface of the lower supporting block 5 are square, the side length of the square is 3m-3.5m, and the bottom surface of the upper supporting block 1 and the top surface of the lower supporting block 5 can be set into different shapes according to different mining mines.
Further, the third grooves 4 are all distributed in a matrix.
A construction method for quickly constructing a supporting structure of a gob-side entry retaining comprises the following steps:
s1: the method comprises the steps that the section size of a roadway needs to be measured in advance, then an upper supporting block 1, a lower supporting block 5 and a middle supporting block 8 are prefabricated on the ground in advance according to the section size of the roadway, the total height of the upper supporting block 1, the lower supporting block 5 and the middle supporting block 8 is lower than the total height of the gob-side entry retaining way by 100-150mm, and the prefabricated upper supporting block 1 and lower supporting block 5 are made of the following raw material components in percentage by mass: 40-50% of gangue, 5-10% of fly ash, 18-25% of cement, 5-10% of sand, 10-15% of stone and 9-15% of water; the prefabricated middle supporting block 8 is prepared from the following raw material components in percentage by mass: 50-55% of gangue, 5-10% of fly ash, 15-20% of cement, 5-10% of sand, 5-10% of cobble, 10-15% of water, 1-2% of asbestos net and 1-2% of cross-linking agent, wherein the cross-linking agent is any one of epoxy resin or polyethylene and the like;
s2: conveying the upper supporting block 1, the lower supporting block 5 and the middle supporting block 8 which are prefabricated in the step S1 to the position 5-10m in front of the coal mining working face, forming a notch for fixing the lower supporting block 5 at the position close to the coal mining working face 3-5m, fixing the lower supporting block 5 at the notch, inserting the bottom ends of the connecting ribs 7 into the fourth grooves 6, and inserting the top ends of the connecting ribs 7 into the third grooves 4 corresponding to the fourth grooves 6; at the moment, the upper supporting block 1 is supported by a jack, the two middle supporting blocks 8 are respectively pushed into the space between the upper supporting block 1 and the lower supporting block 5 from the left side and the right side, the arc grooves 9 arranged on the two middle supporting blocks 8 are spliced and sleeved outside the connecting ribs 7, then the arc grooves 9 spliced and sleeved outside the connecting ribs 7 are filled with a plurality of strip-shaped blocks, the jack is removed, and then quantitative water is injected into the first groove 2 to expand and jack the expanding agent, as shown in fig. 8, the assembled rapid roadway support building block is installed in a stoping roadway B, and the assembled rapid roadway support building block is close to a position of 3-5m of a mining working face (to be mined C);
s3: along with the advance of working face mining, in order to continuously support and seal one side of the goaf, as shown in fig. 8-9, the upper support block 1, the lower support block 5 and the middle support block 8 are assembled according to the above S2 and sequentially arranged along the stope B on one side close to the goaf a, and in order to ensure the stability of the stope B, a stress strain sensor 10 is installed in the second groove 3 every 20-100m for real-time monitoring of the deformation condition of the support structure.
Further, the outer sides of the assembled upper support block 1, lower support block 5 and middle support block 8 are reinforced by using channel steel connection for increasing stability.
The above disclosure is only of the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any changes can be made by those skilled in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a support structure of quick construction gob entry which characterized in that includes:
the top of the upper supporting block (1) is provided with a first groove (2) for placing an expanding agent, the middle of the upper supporting block is provided with a second groove (3) for placing a stress strain sensor (10), and the bottom of the upper supporting block is provided with a plurality of third grooves (4);
the bottom of the lower supporting block (5) is arranged on the bottom wall of the coal recovery wall, and a plurality of fourth grooves (6) which are in one-to-one correspondence with the third grooves (4) are formed in the top of the lower supporting block;
the plurality of connecting ribs (7) are used for connecting the upper supporting block (1) and the lower supporting block (5), the top ends of the connecting ribs (7) are inserted into the third grooves (4), the bottom ends of the connecting ribs (7) are inserted into the fourth grooves (6), and the bottom ends of the connecting ribs (7) are positioned above the bottom wall of the fourth grooves (6);
the two middle supporting blocks (8) are symmetrically arranged between the upper supporting block (1) and the lower supporting block (5) respectively, the supporting strength of the two middle supporting blocks (8) is smaller than that of the upper supporting block (1) and the lower supporting block (5), a plurality of arc grooves (9) are formed in the two middle supporting blocks (8), and the two arc grooves (9) which are oppositely arranged on the two middle supporting blocks (8) are spliced and then are nested on the connecting ribs (7).
2. The supporting structure for quickly constructing gob-side entry retaining according to claim 1, wherein the bottom ends of the connecting ribs (7) are all conical structures.
3. A support structure for quickly constructing gob-side entry retaining according to claim 1 or 2, characterized in that a plurality of strip-shaped blocks are filled in the gap between two arc-shaped grooves (9) which are nested on the connecting ribs (7) after splicing and the connecting ribs (7), and the strip-shaped blocks are made of the same material as the support blocks (8) in preparation.
4. A support structure for rapid construction of gob-side entry retaining according to claim 1, characterised in that the spacing between adjacent third recesses (4) is 0.75m-0.85m.
5. The supporting structure for quickly constructing the gob-side entry retaining device according to claim 1 is characterized in that the bottom surface of the upper supporting block (1) and the top surface of the lower supporting block (5) are rectangular.
6. The supporting structure for quickly constructing gob-side entry retaining according to claim 5, wherein the bottom surface of the upper supporting block (1) and the top surface of the lower supporting block (5) are square, and the side length of the square is 3m-3.5m.
7. A support structure for rapid construction of gob-side entry retaining according to claim 1, wherein said plurality of third recesses (4) are each arranged in a matrix.
8. The construction method for quickly constructing the support structure of the gob-side entry retaining according to claim 1, which is characterized by comprising the following steps:
s1: the upper supporting block (1), the lower supporting block (5) and the middle supporting block (8) are prefabricated in advance according to the section size of the roadway, and the total height of the upper supporting block (1), the lower supporting block (5) and the middle supporting block (8) after being assembled is 100-150mm lower than the total height of the gob-side entry retaining;
s2: conveying the upper supporting block (1), the lower supporting block (5) and the middle supporting block (8) which are prefabricated in the S1 to the position 5-10m in front of a coal mining working face, forming a notch for fixing the lower supporting block (5) at the position close to the coal mining working face 3-5m, fixing the lower supporting block (5) at the notch, inserting the bottom ends of the connecting ribs (7) into the fourth grooves (6), and inserting the top ends of the connecting ribs (7) into the third grooves (4) corresponding to the fourth grooves (6); at the moment, the upper supporting block (1) is supported by a jack, the two middle supporting blocks (8) are respectively pushed into the space between the upper supporting block (1) and the lower supporting block (5) from the left side and the right side, at the moment, all the arc-shaped grooves (9) arranged on the two middle supporting blocks (8) are spliced and sleeved outside all the connecting ribs (7), then a plurality of strip-shaped blocks are filled in the arc-shaped grooves (9) spliced and sleeved outside all the connecting ribs (7), the jack is removed, and then quantitative water is injected into the first groove (2) to expand the expanding agent to be connected with the jack;
s3: along with the advance of working face exploitation, in order to continuously support and seal one side of the goaf, the upper supporting block (1), the lower supporting block (5) and the middle supporting block (8) are assembled according to the step S2, and are sequentially arranged on one side close to the goaf along a roadway, and a stress strain sensor (10) is arranged in a second groove (3) every 20-100 m.
9. The construction method for quickly constructing the gob-side entry retaining support structure according to claim 8, wherein the outer sides of the assembled upper support block (1), lower support block (5) and middle support block (8) are reinforced by using channel steel connection.
10. The construction method for quickly constructing the gob-side entry retaining supporting structure according to claim 8, characterized in that the prefabricated upper supporting block (1) and the prefabricated lower supporting block (5) are both made of the following raw material components in percentage by mass: 40-50% of gangue, 5-10% of fly ash, 18-25% of cement, 5-10% of sand, 10-15% of stone and 9-15% of water; the prefabricated middle supporting block (8) is prepared from the following raw material components in percentage by mass: 50-55% of gangue, 5-10% of fly ash, 15-20% of cement, 5-10% of sand, 5-10% of stone, 10-15% of water, 1-2% of asbestos gauze and 1-2% of cross-linking agent.
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| CN202110976962.0A CN113550763B (en) | 2021-08-24 | 2021-08-24 | Supporting structure for quickly constructing gob-side entry retaining and construction method thereof |
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| CN202110976962.0A CN113550763B (en) | 2021-08-24 | 2021-08-24 | Supporting structure for quickly constructing gob-side entry retaining and construction method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161480A (en) * | 2013-03-14 | 2013-06-19 | 中国矿业大学 | Method for actively supporting lane side filling gob-side entry retaining |
| CN103883336A (en) * | 2014-04-11 | 2014-06-25 | 山东科技大学 | Adjustable gob-side entry retaining wall with initial active and later buffering support and implementing method thereof |
| WO2016206616A1 (en) * | 2015-06-24 | 2016-12-29 | 何满潮 | Equipment system for no-roadway no-coal-pillar retained roadway mining method |
-
2021
- 2021-08-24 CN CN202110976962.0A patent/CN113550763B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161480A (en) * | 2013-03-14 | 2013-06-19 | 中国矿业大学 | Method for actively supporting lane side filling gob-side entry retaining |
| CN103883336A (en) * | 2014-04-11 | 2014-06-25 | 山东科技大学 | Adjustable gob-side entry retaining wall with initial active and later buffering support and implementing method thereof |
| WO2016206616A1 (en) * | 2015-06-24 | 2016-12-29 | 何满潮 | Equipment system for no-roadway no-coal-pillar retained roadway mining method |
Non-Patent Citations (1)
| Title |
|---|
| 林东才 ; 栾恒杰 ; 贾传洋 ; 张壮壮 ; .预筑大型混凝土砌块组装墙快速沿空留巷技术.煤矿安全.2015,(01),全文. * |
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