CN114278293B - Roof cutting method for coal seam roof - Google Patents
Roof cutting method for coal seam roof Download PDFInfo
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- CN114278293B CN114278293B CN202111466566.XA CN202111466566A CN114278293B CN 114278293 B CN114278293 B CN 114278293B CN 202111466566 A CN202111466566 A CN 202111466566A CN 114278293 B CN114278293 B CN 114278293B
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- 239000003245 coal Substances 0.000 title claims abstract description 69
- 238000005520 cutting process Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 133
- 239000007787 solid Substances 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 238000005065 mining Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000725 suspension Substances 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000003721 gunpowder Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to the technical field of coal mine safety production, and provides a method for cutting a roof of a coal seam, which comprises the following steps: constructing at least one row of first drilling holes and at least one row of second drilling holes on a top plate of the end head of the working face in the stoping roadway; the tail end of the first drilling hole and the tail end of the second drilling hole are respectively positioned at two sides of a coal pillar side roadway side of the stoping roadway; the face end top plate is truncated based on at least two first bores and at least two second bores. According to the method for cutting the roof of the coal seam roof, provided by the invention, the roof of the end head of the working face is drilled and cut in advance, so that the controllable orderly collapse of the roof of the coal seam can be controlled, the internal stress of the roof of the coal seam is eliminated, and the safety of the subsequent coal mining stage is ensured.
Description
Technical Field
The invention relates to the technical field of coal mine safety production, in particular to a method for cutting a roof of a coal seam.
Background
At present, most mining areas face the problem of large-area end suspension of working faces with different degrees in the coal seam exploitation process, and the end suspension is a common phenomenon. The end suspension roof refers to: in a certain area of the upper end and the lower end of the working surface during normal stoping, the top plate cannot collapse in time along with the pushing of the working surface. According to the national safety production standardized production related management implementation system, the area of the suspended top of the end is smaller than 10 square meters, and the suspended top belongs to a normal range. However, the large-area end suspension roof is easy to suddenly collapse, so that strong dynamic load is caused, the bracket is impacted, and the safety of personnel and equipment is seriously endangered; meanwhile, the larger overhead area of the end head can lead to fresh air flowing to the goaf through the overhead end head, and the ventilation safety of the working face is affected.
Disclosure of Invention
The invention provides a method for cutting a roof of a coal seam, which is used for solving or improving the problem that the occurrence of safety accidents is caused by the fact that the collapse of the roof of the coal seam is difficult to effectively control in the existing process of mining a hard roof coal seam.
The invention provides a method for cutting a roof of a coal seam, which comprises the following steps: constructing at least one row of first drilling holes and at least one row of second drilling holes on a top plate of the end head of the working face in the stoping roadway; the tail end of the first drilling hole and the tail end of the second drilling hole are respectively positioned at two sides of a side roadway wall of a coal pillar of the stoping roadway; and roof cutting is carried out on the working face end top plate based on at least two first drilling holes and at least two second drilling holes.
According to the method for cutting the roof of the coal seam roof, provided by the invention, under the condition that the stoping roadway comprises a track roadway and a transport roadway, at least one row of first drilling holes and at least one row of second drilling holes are constructed to the roof of the end head of the working face in the stoping roadway, and the method comprises the following steps: constructing at least one row of first drilling holes and at least one row of second drilling holes on the end top plate of the working face in the track roadway and the transport roadway, wherein a plurality of the first drilling holes and a plurality of the second drilling holes are sequentially arranged along the trend direction;
The first drilling holes constructed in the track roadway are opposite to the first drilling holes constructed in the transport roadway one by one along the trend direction, and the second drilling holes constructed in the track roadway are opposite to the second drilling holes constructed in the transport roadway one by one along the trend direction.
According to the method for cutting the roof of the coal seam, the first drilling holes and the second drilling holes which are constructed in the track roadway or the transportation roadway are in one-to-one correspondence along the inclined direction.
According to the method for cutting the roof of the coal seam, the plurality of first drilling holes are sequentially arranged along the trend direction, the axes of two adjacent first drilling holes are parallel, and the distance between the two adjacent first drilling holes is equal to the target caving step distance.
According to the method for cutting the roof of the coal seam, the plurality of second drilling holes are sequentially arranged along the trend direction, the axes of two adjacent second drilling holes are parallel, and the distance between the two adjacent first drilling holes is equal to the distance between the two adjacent second drilling holes.
According to the method for cutting the roof of the coal seam, the end roof of the working face is provided with a first side and a second side which are opposite, the first drilling hole extends upwards from the first side to the second side in an inclined mode along the vertical plane where the trend direction is located.
According to the method for cutting the roof of the coal seam, provided by the invention, the included angle between the extending direction of the first drilling hole and the trend direction is 45-55 degrees.
According to the method for cutting the roof of the coal seam, provided by the invention, the second drilling hole extends upwards from the first side to the second side in an inclined mode along the vertical surface where the inclination direction is located.
According to the method for cutting the roof of the coal seam, provided by the invention, the included angle between the extending direction of the second drilling hole and the inclined direction is 45-55 degrees.
According to the method for roof cutting of the coal seam roof, which is provided by the invention, roof cutting is carried out on the working face end roof based on at least two first drilling holes and at least two second drilling holes, and the method comprises the following steps: and arranging fillers in at least two first drilling holes and at least two second drilling holes so as to realize blasting roof cutting or fracturing roof cutting.
According to the method for cutting the roof of the coal seam, the first drilling holes and the second drilling holes are formed in the roof of the end of the working face in advance, so that the strength of the roof of the end of the working face is effectively reduced, roof cutting operation is carried out on the basis of the first drilling holes and the second drilling holes, the roof of the end of the working face is divided into a plurality of quadrangles, four sides of each quadrangle are converted into simply supported states from solid supported states, after the coal seam is mined out, the roof of the end of the working face loses supporting force, and therefore the roof of the end of the working face controllably collapses orderly in the shape of the quadrangles, uncertainty of collapse of the roof of the end of the working face when the span is overlarge is eliminated, and coal mining safety is guaranteed.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for roof cutting of a coal seam roof provided by the invention;
FIG. 2 is a schematic diagram of the front view of the working face end top plate provided by the invention;
FIG. 3 is a schematic top view of a working face end top plate according to the present invention;
FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 2;
Reference numerals:
11: track roadway; 12: a transportation roadway; 21: a first borehole; 22: a second borehole; 3: a working face end top plate; 4: and (3) a coal seam.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
The following describes a method for cutting the roof of a coal seam according to the present invention with reference to fig. 1 to 4.
As shown in fig. 1, the method for roof cutting of the coal seam roof in this embodiment includes: step 110 and step 120.
The respective steps are explained below with reference to fig. 2 to 4.
Step 110, constructing at least one row of first drilling holes 21 and at least second drilling holes 22 on the working face end top plate 3 in the stoping roadway; wherein, the end of the first drilling hole 21 and the end of the second drilling hole 22 are respectively positioned at two sides of the side roadway wall of the coal pillar of the stope.
Specifically, a stoping roadway is formed in advance on one side of the coal seam 4, and coal mining equipment, conveying equipment, supporting equipment, ventilation equipment and the like are arranged in the stoping roadway; and (3) drilling operation is carried out on the working face end top plate 3 in the stope, namely, the head end of the first drilling hole 21 and the head end of the second drilling hole 22 are both positioned on the working face end top plate 3 in the stope, wherein the tail end of the first drilling hole 21 is positioned on the working face end top plate 3 right above the stope, the second drilling hole 22 is obliquely opened towards the side of the coal seam 4, the axis of the second drilling hole 22 is intersected with the coal pillar of the stope, and the tail end of the second drilling hole 22 extends to the working face end top plate 3 right above the coal seam 4 along with the deep penetration of the second drilling hole 22, so that the tail end of the first drilling hole 21 and the tail end of the second drilling hole 22 are respectively positioned on two sides of the coal pillar side roadway, and the second drilling hole 22 effectively weakens the strength of the working face end top plate 3 right above the coal seam 4 as shown by a dotted line in fig. 3.
In one embodiment, as shown in fig. 3, a row of first bores 21 and a row of second bores 22 are preferably formed in the face end top plate 3.
Step 120, roof cutting is performed on the working face end top plate 3 based on the at least two first drilling holes 21 and the at least two second drilling holes 22.
Specifically, as shown in fig. 3, by selecting at least two first drilling holes 21 and at least two second drilling holes 22 to perform roof cutting, connecting lines of at least four drilling holes enclose a quadrilateral, positions of the four drilling holes are vertices of the quadrilateral, after roof cutting is performed based on the at least four drilling holes, four sides of the quadrilateral are converted from a solid support state to a simply support state, so that the working face end top plate 3 breaks and collapses in a quadrilateral shape.
In the embodiment of the invention, the strength of the working face end top plate 3 is effectively reduced by pre-arranging the first drilling hole 21 and the second drilling hole 22 on the working face end top plate 3, the working face end top plate 3 is divided into a plurality of quadrangles based on the top cutting operation of the first drilling hole 21 and the second drilling hole 22, four sides of each quadrangle are converted into simply supported states from solid supported states, and after the coal bed 4 is emptied, the working face end top plate 3 loses supporting force, so that the working face end top plate 3 controllably collapses orderly in the shape of the quadrangles, the uncertainty of the collapse of the working face end top plate 3 when the span is overlarge is eliminated, and the safety of coal exploitation is ensured.
In an alternative embodiment, as shown in fig. 2 and 3, the stoping roadway shown in the present embodiment includes a track roadway 11 and a transport roadway 12, where the track roadway 11 and the transport roadway 12 are respectively located at two sides of the coal seam 4, at least one row of first drill holes 21 and at least one row of second drill holes 22 are each constructed to the working surface in the track roadway 11 and the transport roadway 12, where the plurality of first drill holes 21 and the plurality of second drill holes 22 are each sequentially arranged along the trend direction, the first drill holes 21 constructed in the track roadway 11 are one-to-one opposite to the first drill holes 21 constructed in the transport roadway 12 along the trend direction, and the second drill holes 22 constructed in the track roadway 11 are one-to-one opposite to the second drill holes 22 constructed in the transport roadway 12 along the trend direction.
It should be noted that, the trend direction refers to the extending direction of the working surface, and is also the extending direction of the stope, that is, the direction from top to bottom in fig. 3, and is also the direction from left to right in fig. 4; the direction of inclination refers to the direction perpendicular to the side roadway side of the coal pillar of the recovery roadway, namely the direction from left to right or from right to left in fig. 3, and the direction from left to right or from right to left in fig. 2, and it is understood that the direction of inclination is perpendicular to the direction of inclination.
Specifically, the first and second boreholes 21 and 22 constructed in the track tunnel 11 are all arranged along the direction of the trend, the first and second boreholes 21 and 22 constructed in the transport tunnel 12 are all arranged along the direction of the trend, the line connecting the first borehole 21 constructed in the track tunnel 11 with the first borehole 21 constructed in the corresponding transport tunnel 12 is along the direction of the trend, and the line connecting the second borehole 22 constructed in the track tunnel 11 with the second borehole 22 constructed in the corresponding transport tunnel 12 is along the direction of the trend, then the first and second boreholes 21 and 22 divide the working face end top plate 3 into a plurality of rectangles, and after roof cutting is performed based on the first and second boreholes 21 and 22, the working face end top plate 3 is orderly collapsed in the form of rectangular blocks.
In one embodiment, as shown in fig. 3, a row of first bores 21 and a row of second bores 22 are preferably constructed in the track roadway 11, and a row of first bores 21 and a row of second bores 22 are preferably constructed in the haulage roadway 12.
In an alternative embodiment, as shown in fig. 3, the first holes 21 and the second holes 22 constructed in the track roadway 11 or the transport roadway 12 in this embodiment are in one-to-one correspondence in the direction of inclination.
Specifically, along the direction of inclination, the first drilling hole 21 and the second drilling hole 22 of the track roadway 11 and the first drilling hole 21 and the second drilling hole 22 in the transport roadway 12 are collinear, and when roof cutting is performed based on the first drilling hole 21 and the second drilling hole 22, four drilling holes on the common line form one side of a rectangular block, so that the periphery of the working face end top plate 3 in the rectangular block can be effectively cut off, and the periphery of the working face end top plate 3 in the rectangular block is converted from a solid supporting state to a simply supporting state, so that the working face end top plate 3 in the rectangular block can be orderly collapsed.
In an alternative embodiment, as shown in fig. 3 and 4, the plurality of first boreholes 21 are arranged in sequence in the direction of the trend, the axes of two adjacent first boreholes 21 are parallel, and the distance between two adjacent first boreholes 21 is equal to the target collapse step.
Specifically, the axes of two adjacent first drilling holes 21 in any one row are parallel, and the distances are equal and are L, then after roof cutting is performed based on the two adjacent first drilling holes 21, the target collapse step distance of the rectangular block is L, the range of L is 5-15m, specifically may be 5m, 8m, 10m, 12m or 15m, and a suitable L value is selected according to the actual geological stress condition, so that the top plate can controllably and orderly collapse.
In an alternative embodiment, as shown in fig. 3, the plurality of second bores 22 are arranged in order in the direction of the trend, the axes of the adjacent two second bores 22 are parallel, and the distance between the adjacent two first bores 21 and the like is the distance between the adjacent two second bores 22.
Specifically, since the distances between the two adjacent first drilling holes 21 and the two adjacent second drilling holes 22 are equal, and the first drilling holes 21 and the second drilling holes 22 are opposite to each other in the direction of inclination, the first drilling holes 21 and the second drilling holes 22 in the track roadway 11 are collinear with the first drilling holes 21 and the second drilling holes 22 in the corresponding transportation roadway 12 in the direction of inclination, when roof cutting is performed based on the first drilling holes 21 and the second drilling holes 22, the working face end top plate 3 is cut into a plurality of rectangular blocks, one side of the rectangular blocks is formed by four drilling holes on the common line, and the working face end top plate 3 right above the coal seam is completely cut off, so that the periphery of the rectangular blocks is converted from a solid supporting state to a simply supporting state, and the working face end top plate 3 is in a plurality of rectangular blocks in order.
Preferably, as shown in fig. 2 and 3, the working face end top plate 3 has a first side and a second side opposite to each other, and a first bore 21 extends obliquely upward from the first side to the second side along a vertical plane in which the direction of travel is located.
Specifically, as shown in fig. 2, the first side and the second side of the working face end top plate 3 refer to the upper side and the lower side of the working face end top plate 3, and the first drilling 21 penetrates from the first side to the second side, which is equivalent to penetrating the working face end top plate 3 to a certain extent, but under the actual geological condition, the top plate thickness is larger, the first drilling 21 cannot completely penetrate the working face end top plate 3, and then in a certain thickness range, the first drilling 21 is equivalent to penetrating the working face end top plate 3 in the current thickness range, so that the strength of the working face end top plate 3 is reduced.
Further, as shown in fig. 4, the included angle between the extending direction and the trend direction of the first drilling hole 21 is α, where the value range of α is 45 ° to 55 °, specifically may be 45 °, 48 °,50 °,52 ° or 55 °, and an appropriate α value may be selected according to the actual stress condition of the working face end top plate 3, and by obliquely arranging the first drilling hole 21, the length of the first drilling hole 21 can be increased within a certain thickness range of the working face end top plate 3, that is, the damage area of the working face end top plate 3 is increased, so that the strength of the working face end top plate 3 is effectively reduced.
Preferably, as shown in fig. 2, the second bore 22 extends obliquely upward from the first side to the second side along a vertical plane in which the direction of inclination lies.
Specifically, as mentioned above, under the actual geological condition, the thickness of the top plate is larger, and the second drilling hole 22 cannot completely penetrate the top plate 3 of the working face end, so that in a certain thickness range, the second drilling hole 22 is equivalent to penetrating the top plate 3 of the working face end in the current thickness range, thereby reducing the strength of the top plate 3 of the working face end.
Further, as shown in fig. 2, the included angle between the extending direction and the inclined direction of the second drilling hole 22 is β, the value range of β is 45 ° to 55 °, specifically may be 45 °, 48 °, 50 °, 52 ° or 55 °, and an appropriate β value may be selected according to the actual stress condition of the top plate, and by obliquely arranging the second drilling hole 22, the length of the second drilling hole 22 can be increased within a certain thickness range of the top plate 3 of the working surface end, that is, the damage area of the top plate 3 of the working surface end is increased, so that the strength of the top plate 3 of the working surface end is effectively reduced.
Preferably, the step 120 of topping the face end top plate 3 based on the at least two first bores 21 and the at least two second bores 22 comprises: a filler is laid in at least two first drillings 21 and at least two second drillings 22 to achieve blast roof cutting or fracture roof cutting.
Specifically, roof cutting is performed based on at least two first drilling holes 21 and at least two second drilling holes 22, namely roof cutting is performed based on at least four drilling holes, four vertexes of a quadrilateral are formed at positions where the four drilling holes are located, the working face end top plate 3 is equivalent to being divided into a plurality of quadrilateral blocks, and after roof cutting is completed, the working face end top plate 3 is orderly collapsed into a plurality of quadrilateral block plates; the filler can be gunpowder or high-pressure water, blasting roof cutting is realized by igniting the gunpowder, fracturing roof cutting is realized by the high-pressure water, namely roof cutting refers to cutting off a top plate between two drilling holes, so that the periphery of the top plate 3 of the end of the working face is converted from a solid supporting state to a simply supporting state, and the top plate 3 of the end of the working face can controllably and orderly collapse.
In an alternative embodiment, after step 120, the method for roof cutting of the coal seam roof further includes: step 130.
And 130, controlling the coal mining machine to coal in the direction of inclination.
Specifically, the coal mining machine cuts the coal seam along the inclined direction, the thickness of the coal seam 4 between the track tunnel 11 and the transport tunnel 12 is gradually reduced until the track tunnel 11 is communicated with the transport tunnel 12, so that a goaf is formed below the working face end top plate 3, at the moment, the working face end top plate 3 loses the supporting force of the coal seam 4, the working face end top plate 3 controllably and orderly collapses, the internal stress of the working face end top plate 3 is released, and the safety of coal mining is ensured.
Preferably, after step 130, further includes: step 140.
And 140, controlling the coal mining machine to advance along the trend direction.
Specifically, after the coal cutter finishes cutting the coal seam of the current station, the coal cutter retreats into the stoping roadway, and the coal cutter is controlled to advance one station along the trend direction, so that the coal seam in front of the goaf is cut, and the working face end top plate 3 of the goaf behind the coal cutter gradually and orderly collapses.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for roof cutting of a coal seam roof, comprising:
Constructing at least one row of first drilling holes and at least one row of second drilling holes on a top plate of the end head of the working face in the stoping roadway; the tail end of the first drilling hole and the tail end of the second drilling hole are respectively positioned at two sides of a coal pillar side roadway wall of a stoping roadway, the tail end of the second drilling hole extends to the working face end top plate right above a coal seam, the tail end of the first drilling hole is positioned on the working face end top plate right above the stoping roadway, at least one row of connecting lines of the first drilling hole and at least one row of second drilling hole enclose a quadrangle, and the positions of at least one row of first drilling holes and at least one row of second drilling holes are vertexes of the quadrangle;
Cutting the top of the working face end top plate based on at least two first drilling holes and at least two second drilling holes, dividing the working face end top plate into a plurality of rectangular blocks by the two first drilling holes and the two second drilling holes, converting the periphery of the working face end top plate from a solid supporting state to a simply supporting state, and sequentially dropping the working face end top plate by taking the rectangular blocks as units;
The working face end top plate is provided with a first side and a second side which are opposite to each other, a vertical surface is positioned along the trend direction, and the first drilling hole extends upwards from the first side to the second side in an inclined manner; the included angle between the extending direction of the first drilling hole and the trend direction is 45-55 degrees; the second drilling hole extends obliquely upwards from the first side to the second side along a vertical surface in which the inclination direction is located; and an included angle between the extending direction of the second drilling hole and the inclined direction is 45-55 degrees.
2. A method of roof cutting in a coal seam as claimed in claim 1, wherein in the event that the recovery roadway includes a track roadway and a transport roadway, the construction of at least one row of first bores and at least one row of second bores into the face end roof in the recovery roadway comprises:
constructing at least one row of first drilling holes and at least one row of second drilling holes on the end top plate of the working face in the track roadway and the transport roadway, wherein a plurality of the first drilling holes and a plurality of the second drilling holes are sequentially arranged along the trend direction;
The first drilling holes constructed in the track roadway are opposite to the first drilling holes constructed in the transport roadway one by one along the trend direction, and the second drilling holes constructed in the track roadway are opposite to the second drilling holes constructed in the transport roadway one by one along the trend direction.
3. A method of roof cutting in a coal seam as claimed in claim 2 wherein the first and second bores are formed in one-to-one correspondence in the direction of inclination in the track or transport roadway.
4. A method of roof cutting in a coal seam as claimed in claim 1, wherein a plurality of said first bores are arranged in series in the strike direction, the axes of adjacent two of said first bores are parallel, and the distance between adjacent two of said first bores is equal to the target collapse step.
5. A method of roof cutting in a coal seam as claimed in claim 4, wherein a plurality of said second bores are arranged in series in the direction of travel, the axes of adjacent two of said second bores being parallel and the distance between adjacent two of said first bores being equal to the distance between adjacent two of said second bores.
6. The method of roof cutting of a coal seam roof of claim 1, wherein the roof cutting of the face end roof based on at least two of the first bores and at least two of the second bores comprises:
And arranging fillers in at least two first drilling holes and at least two second drilling holes so as to realize blasting roof cutting or fracturing roof cutting.
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| CN202111466566.XA CN114278293B (en) | 2021-12-03 | 2021-12-03 | Roof cutting method for coal seam roof |
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| CN103278055A (en) * | 2013-05-31 | 2013-09-04 | 辽宁工程技术大学 | Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting |
| CN104790954A (en) * | 2015-03-27 | 2015-07-22 | 黑龙江科技大学 | Roadside packing gob-side entry retaining top-cutting explosion pressure relief method |
| CN109236362A (en) * | 2018-11-13 | 2019-01-18 | 辽宁工程技术大学 | A method of it determines and comprehensive puts gob side entry retaining road-in packing supporting parameter |
| CN110080769A (en) * | 2019-05-09 | 2019-08-02 | 大同煤矿集团有限责任公司 | A kind of coal mine faces sky stope drift active workings tight roof ground and precisely cuts top pressure relief method |
| CN110295880A (en) * | 2019-07-04 | 2019-10-01 | 中国矿业大学 | A kind of optimization of various dimensions hydraulic fracturing roof stops the method for adopting line |
| CN111173514A (en) * | 2019-12-30 | 2020-05-19 | 天地科技股份有限公司 | Method for processing suspended ceiling of upper corner of mine working face |
| CN112610218A (en) * | 2020-12-02 | 2021-04-06 | 中国矿业大学(北京) | Thick coal seam fully-mechanized top-tunneling top-cutting pressure relief automatic roadway forming method |
| CN112647945A (en) * | 2020-12-23 | 2021-04-13 | 辽宁工程技术大学 | Hard roof cutting method for protective layer mining |
| CN113107491A (en) * | 2021-05-11 | 2021-07-13 | 华亭煤业集团有限责任公司 | Old roof breaking step control method and application thereof |
| CN113417638A (en) * | 2021-07-21 | 2021-09-21 | 中国矿业大学 | Advanced roof cutting pressure relief and surrounding rock control method for hard roof of gob-side roadway |
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