CN112012742B - Method for preventing rock burst of large-section hole-cutting and downward-digging steep coal seam of coal mine - Google Patents
Method for preventing rock burst of large-section hole-cutting and downward-digging steep coal seam of coal mine Download PDFInfo
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- 238000005422 blasting Methods 0.000 claims abstract description 28
- 230000005641 tunneling Effects 0.000 claims abstract description 14
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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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
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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Abstract
The invention discloses a method for preventing and controlling rock burst of large-section cutting hole and downward excavation of a coal mine steep inclined coal seam, which is characterized in that the mechanical property of a top plate is changed through blasting, the energy gathered by the top plate is released, and the locally gathered energy is transferred and released, so that the rock burst is prevented and controlled, aiming at the elastic energy gathered in a coal seam bottom plate, the deep hole blasting is carried out on the coal seam bottom plate where the cutting hole is positioned, the elastic energy gathered in a rock stratum of the bottom plate is transferred, the strength and the impact property of the bottom plate when the bottom plate is pressed are further reduced, the cutting hole is always positioned in a pressure relief protection band, the time-space relation of the stress state of the surrounding rock of the cutting hole is analyzed according to site test and engineering analogy, the construction of the cutting hole with large section is ensured, the construction of the cutting hole with large section is improved, and the frequency and the strength of the cutting hole explosion sound are effectively reduced, the safe tunneling of the large-section cut hole is ensured.
Description
Technical Field
The invention discloses a method for preventing and controlling downward excavation rock burst of large-section open-off cuts of a coal mine steep inclined coal seam, relates to a method for preventing and controlling downward excavation rock burst of large-section open-off cuts of a coal mine steep inclined coal seam, and belongs to the technical field of coal mines. In particular to a method for preventing and controlling rock burst by changing the mechanical properties of a top plate and a bottom plate through blasting and transferring and releasing energy gathered by the top plate.
Background
The Wangjiashan coal mine area is located on the north side of the middle section of the Wukuling ridge-Regongshan-six-pan mountain ridge of the main ridge of the Longxi system, and in the process of activity of the Longxi system, the Wangjiashan coal mine area is clamped by the metamorphic rock masses on the south and north sides under constant pressure, and the early structure is cut and utilized by the late structure and other complex factors, so that a complex structural pattern with the Wangjiashan coal mine area being easy to break as the main part and the fold as the auxiliary part is formed. The Wangjiashan coal mining area ruqu structure is formed by a Wangjiashan inclined way and consists of middle-aged stratums, wherein the Wangjiashan inclined way is lifted to the west, folded to the east, spread and gradually covered by a fourth-family stratum, and the Wangjiashan grows for about 10 kilometers. The declination axis is 60 degrees to 70 degrees west from north, the local near east west direction, the formation shapes of the two wings are different, and the declination is an asymmetric declination with a steep quilt in south and a gentle fold in south.
From the geological structure analysis of the mining area, the Wangjiashan structural stress is vertical to the inclined shaft and the fault, the main direction of the structural stress is approximately parallel to the inclined direction of the coal bed, and the coal bed is mainly extruded from the inclined direction. The main coal mining layers of the Wangjiashan coal mine are two layers, wherein the thickness of No. 2 coal is 2.5-16.7 m, the thickness of No. 4 coal is 10-23 m, the dip angle of the coal layer is 30-58 degrees, and the Wangjiashan coal mine belongs to a sharp-inclined coal layer. The method has the characteristics of complex geological conditions, hard top plates, thick coal beds and the like, and mine pressure power appears more frequently along with the increase of mining strength and depth in recent years of Wangshan coal mines of Yongshan Doku company of Gansujing, and seriously threatens the safety production of mines.
The large-inclination fully mechanized caving face large-section cutting holes in front of Wang Jia mountain coal mines are all constructed by upward heading from bottom to top, and because the inclination angle of a coal seam is large, the pressure right in front of a heading head in the construction process is large, a roadway easily falls off and is pulled to be topped, and the secondary cutting hole support causes serious material waste and seriously affects the enterprise benefit.
The mechanism of the coal mine novel disaster is complex due to the fact that rock burst is displayed, a complete method is not available, only the damage of impact display can be reduced and partially eliminated, the rock burst display cannot be completely eradicated, and in multiple places in China, coal mine steep coal seam large-section hole cutting and sinking construction similar to Wangjiashan coal mines faces to the coal mine novel disaster, so that corresponding anti-impact technical guarantee is needed for coal mine steep coal seam large-section hole cutting and sinking construction in the range of the whole country.
Disclosure of Invention
In order to improve the situation, the method for preventing rock burst of the large-section hole-cutting and downward-digging steep coal seam of the coal mine provided by the invention changes the mechanical property of the top plate through blasting, releases the energy accumulated by the top plate and prevents the rock burst from occurring.
The method for preventing rock burst of large-section hole-cutting and downward digging of the steeply inclined coal seam of the coal mine is realized by the following steps:
1. the fully mechanized caving face transportation gate way is firstly constructed to a designed position before the cutting hole tunneling, the cutting hole is communicated with the transportation gate way from the small section of the return air gate way, then the hole is expanded from top to bottom to be a large section, and coal is transported from top to bottom when the cutting hole expansion is conducted;
2. 12 anchor rods are punched and injected into each mesh of a vertical coal seam layer or a top plate at the top of each cut hole, 4 anchor rods are punched and injected into each mesh of two side parts, a rhombic metal mesh is laid on a full section, and a wood supporting plate is uniformly installed on each anchor rod;
3. 9 anchor cables are injected into the top of the vertical coal seam layer at the top of the cutting hole or the top plate every 2 meshes, the anchor cables are uniformly provided with wood supporting plates, and the injection of the 4 meshes of the lag joint is delayed;
4. carrying out full-section guniting sealing on the incisions;
5. three rows of core-point columns are drilled, 2 isolating nets are hung along the inclined direction, the isolating nets are tightly sealed with the top bottom of the roadway and the core-point columns, the isolating nets are in butt joint, the roadway is divided into an upward sidewalk at the right upper side, a middle coal chute and an upward air duct at the left upper side by taking the core-point columns as boundaries, and the top and the bottom are sealed by a protective net;
6. when the top of the cut hole reveals the gangue, the composite top plate and the soft and broken coal body, taking the section of the type as a top plate management key area, densely injecting anchor cables on the top plate for reinforcement, piling up wood piles for reinforcement according to conditions after forming a roadway, and fixing the wood piles by using wrap angle columns and stacking springs;
7. arranging 1 group of 6-hole fan-shaped holes at the open-off opening, arranging 1-hole bottom plate deep hole blasting holes in the open-off winch room, arranging 2-hole top plate deep hole blasting pressure relief holes in the return air along the groove tail roadway, and arranging a plurality of groups of 3-hole fan-shaped top plate deep hole blasting presplitting pressure relief holes during open-off tunneling to ensure that the open-off tunneling head is always in a pressure relief protection band;
8. constructing 3 holes in each chamber, constructing 2 groups in total, constructing 1 group of 3 holes in the transportation crossheading in advance, and blasting pressure relief holes at the bottom of the holes so as to perform deep hole blasting pressure relief on the bottom plate by using the shelter chamber during the cutting excavation period;
furthermore, the isolation net is bound on the logs and the two sides of the cut hole, the metal net is disconnected at the central track of the cut hole, and the metal net is connected by a slipknot.
Has the beneficial effects.
Firstly, the mechanical property of the top plate is changed through blasting, and locally gathered energy is transferred and released, so that rock burst is prevented.
And aiming at the elastic energy gathered in the coal seam floor, the elastic energy gathered in the rock stratum of the floor is transferred by carrying out deep hole blasting on the coal seam floor where the cutting holes are located, so that the strength and the impact property of the floor when the floor is pressed are reduced, and the cutting holes are always positioned in a pressure relief protection band.
And thirdly, analyzing the space-time influence relation of the stress state of the cutting hole surrounding rock according to field test and engineering analogy, and ensuring that the cutting hole is always constructed in the pressure relief protection zone.
And fourthly, the construction of the large-section cut hole is improved, the frequency and the strength of the popping sound of the cut hole are effectively reduced, and the safe tunneling of the large-section cut hole is ensured.
Fifthly, the cost is saved, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic view of a hole cutting, top cutting, blasting, pressure relief drilling arrangement of Wangjiashandong 203;
FIG. 2 is a cross-sectional view of a hole cutting, top cutting, blasting, pressure relief drilling arrangement of Wangjiashandong 203;
FIG. 3 is a schematic view of a hole cutting, bottom breaking blasting pressure relief drilling arrangement of Wangjiashandong 203;
FIG. 4 is a cross-sectional view of a hole cutting, bottom breaking blasting pressure relief drilling arrangement of Wangjiashandong 203;
FIG. 5 is a cutting support section diagram of the method for preventing and treating rock burst in large-section cutting, sinking and heading of a steeply inclined coal seam of a coal mine;
FIG. 6 is a schematic diagram of a top support of a cutting hole of the method for preventing rock burst in large-section cutting hole and downward excavation of a steeply inclined coal seam of a coal mine;
fig. 7 is a schematic diagram of a top support of a large-section open-off and top-digging rock burst control method for a steeply inclined coal seam of a coal mine, which only shows a schematic diagram in another direction.
In the attached drawings
Wherein the method comprises the following steps: the device comprises a wood stack (1), an anchor rod (2), an anchor cable (3), a roadway (4), a pedestrian step (5), a distraction point column (6) and an isolation net (7).
The specific implementation mode is as follows:
example 1
The Dong-one 203 working face of Wang Jiashan coal mine is positioned on the west wing of a Dong-one mining area of a fourth well, the Dong is bounded by 1466 rock gates and 1418 rock gates, the West is bounded by the boundary of a mining area in the fourth well, the size of coal pillars of a cutting hole and a large-inclination fully-mechanized caving face 47208, 47408, 46208 and 46408 mining areas is 55m, the south is bounded by 1418 coal seam floor contour lines, the north part, namely the upper part, is an E11201-2 light caving face mining area, because a small kiln damages a section with the height of 48m and fails to arrange light caving face mining, the Dong-one 203 working face is originally designed to be light caving face mining, the Dong-one 203 roof air return gallery is constructed in the opening of the Dong-one 203 roof, when constructing to 245m, when constructing a top cutting pressure relief hole, the top is found to be a small kiln broken area when constructing the top cutting pressure relief hole, the broken area reaches 200m, the stoping area only has about 4 to be about 4 to 475m after the light caving face is evaluated, two thirds of which is adjusted to be a large inclination angle m, the width of the inclined coal is 75m, the average coal thickness is 16.85m, the inclination angle of a coal seam is 40-50 degrees, an east one 203 cutting hole is positioned near a coal pillar of a middle one mining area and an east one mining area, the middle one mining area is already mined to 1360 level, the east one mining area is mined to 1425 level, so that an east one 203 working face is in a 'peninsula' state, the east one 203 cutting hole is positioned in a boundary coal pillar area of the mining area and belongs to a stress concentration area, the upper part of the east one 203 working face and the lower part 48m of an E11201-2 light release face are high, because a working face cannot be arranged between small kilns in a damage mode, irregular coal pillars formed by small kilns in mining cause stress concentration, bottom breaking blasting and presplitting are carried out on the bottom plate, and energy accumulated in the bottom plate is transferred to be also important.
The invention discloses a method for preventing rock burst of large-section hole-cutting and downward digging of a steeply inclined coal seam of a coal mine, which is realized by taking the Dongyi 203 working face of Wangjiashan coal mine as an example, and comprises the following specific steps of:
1. the Dongyi 203 fully mechanized caving face transportation crossheading is constructed to a designed position before cutting and tunneling, a cutting hole is communicated with the transportation crossheading from a small section of the return air crossheading and then is expanded from top to bottom to form a large section, and coal is transported from top to bottom when the cutting hole is expanded and brushed; the size of the large section is 7.2 m; the cutting hole is communicated with a 3m roadway width; the stress transmission path can be cut off by carrying out deep hole blasting presplitting pressure relief on the top plate, the continuity of the top plate between a goaf and a to-be-mined area is weakened, the energy accumulated by the hole cutting tunneling head is transferred, and the strength and the impact property of the top plate during pressure coming are further reduced;
the coal discharging is convenient and fast, the cost of supporting materials is saved, the construction period is advanced after the construction sequence is adjusted, the safety of normal production continuation and tunneling periods is ensured, and the safety production of the whole mine is realized;
2. 12 anchor rods (2) are punched and injected into each mesh of a vertical coal seam layer or a top plate at the top of each cut hole, 4 anchor rods (2) are punched and injected into each mesh of two side parts, a 10# lead wire woven rhombic metal mesh is laid on a full section, and a wood supporting plate is uniformly installed on each anchor rod (2); the anchor rods (2) are 22 multiplied by 2600mm levorotatory thread steel anchor rods (2); the anchor rods (2) are arranged in a quincunx shape, and the row spacing is 650 multiplied by 700 mm; the meshes of the rhombic metal net are 30mm multiplied by 30 mm; the pre-tightening torque of the diamond metal net is not less than 450 N.m; the wood supporting plate on the anchor rod (2) is a wood plate with the thickness of 200 multiplied by 40 mm;
3. 9 anchor cables (3) are arranged on the top of the cutting hole perpendicular to the bedding of the coal seam or on the top plate every 2 meshes, the anchor cables (3) are uniformly provided with wood supporting plates, and the heading is delayed by 4 meshes; the anchor cables (3) are anchor cables (3) of 17.8 multiplied by 7000mm thick braconies;
the anchor cables (3) are arranged in a rectangular shape, and the row spacing is 1.0 multiplied by 1.4 m; the tensioning strength of the wood supporting plate is not less than 30 MPa; the wood supporting plate on the anchor cable (3) is a wood plate with the thickness of 300 multiplied by 60 mm;
4. carrying out full-section guniting sealing on the incisions; the thickness of the guniting is 40 mm;
5. three rows of center-separated point columns (6) are arranged, 2 isolating nets (7) are hung along the inclined direction, the top bottom of the roadway (4) and the center-separated point columns (6) are tightly sealed, the isolating nets (7) are in butt joint, the roadway (4) is divided into an upward sidewalk on the right upper side, a middle coal chute and an upward air duct side on the left upper side by taking the center-separated point columns (6) as boundaries, and the top and the bottom are connected through a protective net; the isolation net (7) is a rhombic metal net; the net stubble and the net edge of the isolation net (7) are connected and tied firmly by using net wires; the distance between the split point column (6) and the steamed corn bread is not more than 5m, and the distance between the isolation net (7) and the steamed corn bread is not more than 10 m; the split point column (6) is arranged at the position 1.8mm away from the left side and the right side and the center line of the cutting hole by a DZ3.2m single hydraulic prop; the row distance of the three rows of the center-separating point columns (6) is 1.8m, and the distance is 2.0 m;
the cap of the split point column (6) is a semicircle wood with the diameter of 400 multiplied by 200 mm;
6. when the top of the cut hole reveals gangue, a composite top plate and soft and broken coal, taking the section as a top plate management key area, densely injecting anchor cables (3) on the top plate for reinforcement, piling wood piles (1) according to the situation for reinforcement after the top plate is formed into a roadway, and fixing the wood piles (1) by using corner wrapping columns and stacking springs;
7. arranging 1 group of 6-hole fan-shaped holes at the open-off opening, arranging 1 hole bottom-breaking hole at the open-off winch house, arranging 2 hole top plate deep hole blasting presplitting pressure relief holes at the return air along the groove tail lane, and arranging a plurality of groups of 3 hole fan-shaped top plate deep hole blasting pressure relief holes during open-off tunneling to ensure that an open-off tunneling head is always in a pressure relief protective zone; the distance between two adjacent groups of fan-shaped top plate deep hole blasting pressure relief holes is 25 m;
8. and 3 holes are constructed in each chamber, 2 groups of the holes are constructed, and 1 group of 3 hole bottom plate deep hole blasting presplitting pressure relief holes are constructed in the transportation crossheading in advance so as to utilize the shelter chamber to perform bottom plate deep hole blasting pressure relief during the cutting excavation.
Example 2
The difference between this example and example 1 is: the isolation net (7) is bound on the logs on the two sides of the cut hole and the two sides, the metal net is disconnected at the central track of the cut hole and is connected by a movable buckle; when the device is used, the slipknots can be unfastened during transportation, and meanwhile, the pedestrian side isolation net (7) is connected with the upper part by the slipknots so as to be used for unfastening pedestrians at any time; in the process of an underground industrial test, a high-strength left-handed non-longitudinal-rib threaded steel anchor rod (2), high anchoring force and high pre-tightening torque are gradually formed, a small drill bit, a small aperture and a small resin cartridge are reasonably matched, and the anchor rod (2) and the anchor cable (3) are in coordination with each other in length and stress to allow the first-level wood supporting plate to give way so as to adapt to rock burst display, reinforce the weak part and protect the anchor net cable of the surface of the large supporting plate, and the support of the cutting hole adopts a combined support mode of the anchor net cable and the slurry spraying, so that the support stability is good.
The above embodiments are preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that changes may be made without departing from the scope of the invention, and it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
It should be further noted that, while the above specific embodiments are described for simplicity and clarity, only the differences from other embodiments are described, but those skilled in the art should understand that the above specific embodiments are independent technical solutions.
Claims (5)
1. A method for preventing rock burst of large-section hole-cutting and downward-digging of a steeply inclined coal seam of a coal mine is characterized by comprising the following steps of:
1) the fully mechanized caving face transportation gate way is firstly constructed to a designed position before the cutting hole tunneling, the cutting hole is communicated with the transportation gate way from the small section of the return air gate way, then the hole is expanded from top to bottom to be a large section, and coal is transported from top to bottom when the cutting hole expansion is conducted;
2) 12 anchor rods are punched and injected into each mesh of a vertical coal seam layer or a top plate at the top of each cut hole, 4 anchor rods are punched and injected into each mesh of two side parts, a rhombic metal mesh is laid on a full section, and a wood supporting plate is uniformly installed on each anchor rod;
3) 9 anchor cables are injected into the top of the vertical coal seam layer at the top of the cutting hole or the top plate every 2 meshes, the anchor cables are uniformly provided with wood supporting plates, and the injection of the 4 meshes of the lag joint is delayed;
4) carrying out full-section guniting sealing on the incisions;
5) three rows of core-point columns are drilled, 2 isolating nets are hung along the inclined direction, the isolating nets are tightly sealed with the top bottom of the roadway and the core-point columns, the isolating nets are in butt joint, the roadway is divided into an upward sidewalk at the right upper side, a middle coal chute and an upward air duct at the left upper side by taking the core-point columns as boundaries, and the top and the bottom are sealed by a protective net; the isolation net is a diamond metal net; the net stubble and the net edge of the isolation net are connected and firmly bound by net wires; the distance between the split point columns and the steamed corn bread is not more than 5m, and the distance between the isolation net and the steamed corn bread is not more than 10 m; the split point columns are arranged at the positions 1.8mm away from the left side and the right side respectively and at the center line of the eye cutting by using DZ3.2m single hydraulic supports; the row pitch of the three rows of the split point columns is 1.8m, and the pitch is 2.0 m;
the column cap of the split point column is a semicircular wood with the diameter of 400 multiplied by 200 mm;
6) when the top of the cut hole reveals gangue, a composite top plate and soft and broken coal, taking the section as a top plate management key area, densely injecting anchor cables into the top plate for reinforcement, piling wood piles for reinforcement according to conditions after forming a roadway, and fixing the wood piles by using wrap angle columns and stacking springs;
7) arranging 1 group of 6-hole fan-shaped holes at the open-off opening, arranging 1 hole bottom-breaking hole at the open-off winch house, arranging 2 hole top plate deep hole blasting presplitting pressure relief holes at the return air along the groove tail lane, and arranging a plurality of groups of 3 hole fan-shaped top plate deep hole blasting pressure relief holes during open-off tunneling to ensure that an open-off tunneling head is always in a pressure relief protective zone; the distance between two adjacent groups of fan-shaped top plate deep hole blasting pressure relief holes is 25 m;
8) constructing 3 holes in each chamber, constructing 2 groups in total, constructing 1 group of 3 hole bottom plate deep hole blasting presplitting pressure relief holes in the transportation crossheading in advance, and utilizing the shelter chamber to perform bottom plate deep hole blasting pressure relief during the cutting excavation period;
when the top plate is used, deep hole blasting presplitting pressure relief can be carried out on the top plate, a stress transmission route is cut off, the continuity of the top plate between a goaf and a to-be-mined area is weakened, energy accumulated by a hole cutting tunneling head is transferred, and the strength and the impact property of the top plate when pressure is applied are further reduced.
2. The method for preventing and treating rock burst of large-section hole-cutting and downward-digging of the steeply inclined coal seam of the coal mine according to claim 1, wherein the isolation net is bound on logs on two sides and two sides of the hole-cutting, and the metal net is disconnected at a central track of the hole-cutting and is connected by a movable buckle.
3. The method for preventing rock burst of large-section hole-cutting and hole-digging of the steeply inclined coal seam of the coal mine according to claim 1, wherein the anchor in the step 2 is a lawsonia bolt measuring 22 x 2600 mm; the anchor rods are arranged in a quincunx mode, and the row spacing is 650 multiplied by 700 mm; the meshes of the rhombic metal net are 30mm multiplied by 30 mm;
the pre-tightening torque of the rhombic metal net is not less than 450 N.m; the wood supporting plate on the anchor rod is a wood plate with the thickness of 200 multiplied by 40 mm.
4. The method for preventing rock burst of large-section hole-cutting and hole-digging of a coal mine steeply inclined seam as claimed in claim 1, wherein in the step 3, the anchor cable is a 17.8 x 7000mm anchor cable on a scale; the anchor cables are arranged in a rectangular shape, and the row spacing is 1.0 multiplied by 1.4 m; the tensioning strength of the wood supporting plate is not less than 30 MPa; the wood supporting plate on the anchor cable is a wood plate with the thickness of 300 mm multiplied by 60 mm.
5. The method for preventing and treating rock burst of large-section hole-cutting and downward-digging of the steeply inclined coal seam of the coal mine according to claim 1, wherein in the step 4, the thickness of the gunite is 40 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011155224.1A CN112012742B (en) | 2020-10-26 | 2020-10-26 | Method for preventing rock burst of large-section hole-cutting and downward-digging steep coal seam of coal mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011155224.1A CN112012742B (en) | 2020-10-26 | 2020-10-26 | Method for preventing rock burst of large-section hole-cutting and downward-digging steep coal seam of coal mine |
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| Publication Number | Publication Date |
|---|---|
| CN112012742A CN112012742A (en) | 2020-12-01 |
| CN112012742B true CN112012742B (en) | 2022-08-23 |
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| RU2078211C1 (en) * | 1994-07-05 | 1997-04-27 | Акционерное общество "Кузнецкий научно-исследовательский угольный институт" | Method of mining thick steep coal seams |
| RU2083831C1 (en) * | 1995-05-17 | 1997-07-10 | Научно-исследовательский институт горной геомеханики и маркшейдерского дела | Method for treatment of impact-risky seams in difficult mining and geological conditions |
| CN102322262A (en) * | 2011-09-12 | 2012-01-18 | 山东科技大学 | Colliery isolated island coal column crossheading bump control method |
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| CN104806265B (en) * | 2015-03-31 | 2017-01-25 | 辽宁工程技术大学 | Impact ground pressure preventing method of full seam gateway |
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