CN111764901A - Method for inducing collapse of hard top plate of working face through mechanical cutting - Google Patents
Method for inducing collapse of hard top plate of working face through mechanical cutting Download PDFInfo
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- CN111764901A CN111764901A CN202010668997.3A CN202010668997A CN111764901A CN 111764901 A CN111764901 A CN 111764901A CN 202010668997 A CN202010668997 A CN 202010668997A CN 111764901 A CN111764901 A CN 111764901A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
Abstract
The invention discloses a method for inducing a hard top plate of a working face to collapse by mechanical cutting, which belongs to the technical field of coal mining and comprises the following steps: s1, cutting holes in the coal seam; s2, installing a hydraulic support in the incision; s3, repeatedly executing S2; s4, stopping the continuous rock cutter at the end of the cutting hole; s5, starting a cutting tool; s6, moving the continuous rock cutting machine for a distance A2; s7, repeatedly executing S5-S6; s8, tunneling a roof cutting roadway at a position with a distance A3 in front of the cut hole; s9, stopping the continuous rock cutter at the end of the top cutting roadway; s10, starting a cutting tool; s11, moving the continuous rock cutting machine for a distance A4; s12, repeatedly executing S10-S11; s13, executing S8-S12 at the position A3 away from the horizontal distance of the roof cutting roadway; and S14, repeating the step S13 until the top cutting of the whole working face is completed. According to the invention, the tunnel is excavated through the development machine, the top plate is cut in a certain cutting mode by matching with the mechanical cutting machine, the caving step distance of the top plate is controlled, and the mine pressure of the working face can be effectively controlled.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a method for inducing a hard top plate of a working face to collapse by mechanical cutting.
Background
The hard roof mining area accounts for more than one third of the mining area of the coal mine in China. The first pressure and cycle will occur during the working face propulsion process. Under the hard roof, the step distance between the initial pressure and the periodic pressure is large, so that the bracket of the working face is pressed, and the empty roadway deforms and is damaged, thereby seriously influencing the safe and efficient production of the coal mine. In order to solve the problem of the hard roof, scholars at home and abroad propose to drill holes on the hard roof in roadways at two sides and control the mine pressure by adopting a blasting or hydraulic fracturing mode. However, the above method controls the mine pressure only in the roadway range on the two sides of the working face, and the pressure relief effect on the mine pressure of the working face is not obvious.
Therefore, there is an urgent need for a method capable of reducing the mine pressure of the whole working face by cutting the top plate to induce the working face to collapse and controlling the step pitch.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for inducing a hard top plate of a working face to collapse by mechanical cutting, which is characterized in that a tunneling machine excavates a roadway, the top plate is mechanically cut in a certain cutting mode by matching with a mechanical cutting machine, and the collapse step distance of the top plate is controlled, so that the mine pressure of the working face is controlled, and the method specifically comprises the following steps:
a method for inducing a hard top plate of a working face to collapse by mechanical cutting comprises the following steps:
s1, cutting holes in the coal seam;
s2, installing a hydraulic support in the incision;
s3, repeatedly executing the step S2, and installing a plurality of hydraulic supports in the incision;
s4, when the accumulated support width of the hydraulic support installed in the cutting hole is A1, stopping the continuous rock cutting machine at the end head of one end of the cutting hole supported by the hydraulic support, and meanwhile installing the hydraulic support on the whole cutting hole;
s5, starting a walking part, adjusting the machine body to be parallel to the coal wall, starting a cutting tool of the continuous rock cutting machine, horizontally rotating from one side to the other side, and then quickly rotating to the initial horizontal position of the cutting tool;
s6, moving the continuous rock cutter to the other end of the cutting hole along the central line direction of the roadway by a distance A2 by adopting a walking part;
s7, repeatedly executing the steps S5-S6 until the top cutting of the whole cutting hole is completed, and then placing two continuous tunneling machines at a position which is a distance A3 in front of the cutting hole;
s8, adopting the continuous tunneling machine to tunnel a tunnel with the width of L1 and the depth of D1 in a coal seam on the side of an adjacent empty tunnel, and simultaneously adopting the other continuous tunneling machine to tunnel a roof cutting tunnel with the width of L2 and the depth of D2 on the other side of the coal seam;
s9, stopping the two continuous rock cutters at the open ends of two top cutting roadways excavated by the continuous tunneling machine respectively, starting a walking part, and adjusting the machine body to be parallel to the roadway side;
s10, starting the cutting tools of the two continuous rock cutters, horizontally rotating from one side to the other side, and then quickly rotating to the initial horizontal position of the cutting tools;
s11, moving the two continuous rock cutters by a distance A4 along the other end of the roof cutting roadway in the direction of the central line of the roadway by adopting a walking part;
s12, repeatedly executing the steps S10-S11 until the top cutting of the two top cutting roadways is completed;
s13, excavating two roof cutting roadways at the position with the horizontal distance of A3 from the step S9, and executing the steps S8-S12;
and S14, repeatedly executing the step S13 until the top cutting of the whole working surface is completed.
Further, the depth d of the roof cutting is related to the supporting strength of a roadway, wherein when the supporting strength of the roadway is more than 0 and less than or equal to 0.5MPa, the depth d of the roof cutting is 0.8-1.0 time of the height of a caving zone; when the supporting strength of the roadway is more than 0.5MPa and less than or equal to 0.8MPa, the depth d of the roof cutting is 0.7-0.8 time of the height of the caving zone; and when the roadway support strength is greater than 0.8MPa, the depth d of the roof cutting is 0.65-0.7 time of the height of the caving zone.
Further, the moving distance A2 is related to the support strength of the hydraulic support of the cutting hole, wherein when the support strength of the hydraulic support is more than 0 and less than or equal to 0.5MPa, A2 is 0.6-0.65 time of the depth of the cutting top; when the supporting strength of the hydraulic support is more than 0.5MPa and less than or equal to 1.0MPa, the A2 is 0.45-0.6 time of the depth of the cut top; when the supporting strength of the hydraulic support is more than 1.0MPa and less than or equal to 1.5MPa, the A2 is 0.4-0.45 time of the depth of the cut top; when the support strength of the hydraulic support is greater than 1.5MPa, the A2 is 0.3-0.4 time of the depth of the cut top.
Further, the accumulated support width a1 of the hydraulic support is related to the coal seam burial depth H, and the specific relationship is as follows: a1 ═ 20+ 2.5H/100.
Further, the distance A3 is related to the thickness of the basic roof, i.e. A3 is 2-4 times the thickness of the basic roof.
Further, the width L1 and the depth D1 of the roof cutting roadway tunneled by the continuous tunneling machine in the coal seam on one side of the near-empty roadway are related to the width of a coal pillar and the buried depth of the coal seam, wherein when the width of the coal pillar is 30-60m or the buried depth of the coal seam is more than 800m, the width L1 of the roof cutting roadway is 1.5-1.8m, and the depth D1 is 5-8 times of the thickness of a basic roof; when the width of the coal pillar is 0-6m and the buried depth of the coal seam is less than 500m, the width L1 of the roof cutting roadway is 1.8-2.2m, and the depth D1 is 4-6 times of the thickness of the basic roof; in addition to the above conditions, the width L1 of the roof cutting roadway is 1.9-2.5m, and the depth D1 is 6-7 times the thickness of the immediate roof.
Further, the width L2 and the depth D2 of the roof cutting roadway tunneled by the continuous tunneling machine on the other side of the coal seam are related to the buried depth of the coal seam, wherein when 0< the buried depth of the coal seam is less than or equal to 300m, the width L2 of the roof cutting roadway is 2.0-2.5m, and the depth D2 is 6-8 times of the thickness of the direct roof; when the buried depth of the coal seam is more than 300m and less than or equal to 800m, the width L2 of the roof cutting roadway is 1.8-2.0m, and the depth D2 is 5-6 times of the basic roof thickness; when the coal seam burial depth is more than 800m, the width L2 of the roof cutting roadway is 1.5-1.8m, and the depth D2 is 4-5 times of the basic roof thickness. .
Further, the moving distance A4 is related to the uniaxial compressive strength of the basic roof, wherein, when 0< the uniaxial compressive strength of the basic roof is less than or equal to 60GPa, the moving distance A4 is 0.4-0.45 times the depth of the top cutting; when 60GPa < the uniaxial compressive strength of the basic roof is less than or equal to 90GPa, the moving distance A4 is 0.45-0.6 times of the depth of the roof cutting; the displacement distance a4 is 0.6-0.65 times the cutting depth when the uniaxial compressive strength of the basic roof is >90 GPa.
Has the advantages that:
the invention provides a method for inducing caving of a hard top plate of a working face by mechanical cutting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a work surface truncated arrangement;
FIG. 2 is a continuous rock cutter;
wherein, 1, cutting eyes; 2. a hydraulic support, 3, a continuous rock cutter; 4. a traveling section; 5. a coal wall; 6. cutting a cutter; 7. cutting the center line of the hole; 8. a continuous tunneling machine; 9. an adjacent empty roadway; 10. and (5) cutting a top roadway.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for inducing a hard top plate of a working face to collapse by mechanical cutting comprises the following steps:
s1, cutting holes 1 in the coal seam;
s2, installing a hydraulic support 2 in the incision;
s3, repeatedly executing the step S2, and installing a plurality of hydraulic supports 2 in the incision;
s4, when the accumulated support width of the hydraulic support 2 arranged in the cutting hole 1 is A1, stopping the continuous rock cutter 3 at the end head of one end of the cutting hole 1 supported by the hydraulic support 2, and meanwhile, arranging the hydraulic support on the whole cutting hole; in this embodiment, the accumulated support width a1 of the hydraulic support 2 is related to the coal seam burial depth H, and the specific relationship is as follows: a1 ═ 20+ 2.5H/100.
S5, starting the walking part 4, adjusting the machine body to be parallel to the coal wall 5, then starting the cutting tool 6 of the continuous rock cutter 3, horizontally rotating from one side to the other side, and then quickly rotating to the initial horizontal position of the cutting tool 6;
s6, moving the continuous rock cutter 3 to the other end of the cutting hole 1 along the central line direction of the roadway by a distance A2 by adopting the walking part 4; in the embodiment, the moving distance A2 is related to the supporting strength of the hydraulic support 2 of the cutting hole 1, wherein when the supporting strength of the hydraulic support 2 is more than 0 and less than or equal to 0.5MPa, the A2 is 0.6-0.65 time of the depth of the cutting top; when the supporting strength of the hydraulic support 2 is less than or equal to 1.0MPa under 0.5MPa, the A2 is 0.45-0.6 time of the depth of the top cutting; when the supporting strength of the hydraulic support 2 is less than or equal to 1.5MPa under 1.0MPa, the A2 is 0.4-0.45 time of the depth of the top cutting; when the supporting strength of the hydraulic support 2 is more than 1.5MPa, the A2 is 0.3-0.4 time of the depth of the top cutting.
S7, repeatedly executing the steps S5-S6 until the top cutting of the whole cutting hole 1 is completed, and then placing two continuous heading machines at a position which is a distance A3 in front of the cutting hole;
in the present embodiment, the distance A3 is related to the thickness of the base dome, i.e., A3 is 2-4 times the thickness of the base dome.
S8, adopting a continuous tunneling machine 8 to tunnel a roof cutting roadway with the width of L1 and the depth of D1 in the coal seam on one side of the near-empty roadway 9, and simultaneously adopting another continuous tunneling machine 8 to tunnel a roof cutting roadway 10 with the width of L2 and the depth of D2 on the other side of the coal seam;
in the embodiment, the width L1 and the depth D1 of the roof cutting roadway 10 tunneled by the continuous tunneling machine 8 in the coal seam on the side close to the hollow roadway 9 are related to the width of a coal pillar and the buried depth of the coal seam, wherein when the width of the coal pillar is 30-60m or the buried depth of the coal seam is more than 800m, the width L1 of the roof cutting roadway 10 is 1.5-1.8m, and the depth D1 is 5-8 times of the thickness of a basic roof; when the width of the coal pillar is 0-6m and the buried depth of the coal bed is less than 500m, the width L1 of the roof cutting roadway 10 is 1.8-2.2m, and the depth D1 is 4-6 times of the thickness of the basic roof; except for the above conditions, the width L1 of the roof cutting roadway 10 is 1.9-2.5m, and the depth D1 is 6-7 times the thickness of the immediate roof.
The width L2 and the depth D2 of a roof cutting roadway 10 tunneled by the continuous tunneling machine 8 at the other side of the coal seam are related to the coal seam burial depth, wherein when the coal seam burial depth is more than 0 and less than or equal to 300m, the width L2 of the roof cutting roadway 10 is 2.0-2.5m, and the depth D2 is 6-8 times of the direct roof thickness; when the buried depth of the coal seam is more than 300m and less than or equal to 800m, the width L2 of the roof cutting roadway 10 is 1.8-2.0m, and the depth D2 is 5-6 times of the basic roof thickness; when the coal seam burial depth is more than 800m, the width L2 of the roof cutting roadway 10 is 1.5-1.8m, and the depth D2 is 4-5 times of the basic roof thickness.
S9, stopping the two continuous rock cutters 3 at the open ends of two roof cutting roadways 10 excavated by the continuous tunneling machine 8, starting the walking parts 4, and adjusting the machine body to be parallel to the roadway walls;
s10, starting the cutting tools 6 of the two continuous rock cutters 3, horizontally rotating from one side to the other side, and then quickly rotating to the initial horizontal position of the cutting tools 6;
s11, moving the two continuous rock cutters 3 by a distance A4 along the other end of the top-cutting roadway in the direction of the central line of the top-cutting roadway by adopting the walking part 4;
in the embodiment, the moving distance A4 is related to the uniaxial compressive strength of the basic roof, wherein when the uniaxial compressive strength of the basic roof is more than 0 and less than or equal to 60GPa, the moving distance A4 is 0.4-0.45 times of the depth of the cut top; when the uniaxial compressive strength of the basic roof is less than or equal to 90GPa at the pressure of 60GPa, the moving distance A4 is 0.45-0.6 time of the depth of the roof cutting; when the uniaxial compressive strength of the basic roof is more than 90GPa, the moving distance A4 is 0.6-0.65 times of the roof cutting depth
S12, repeatedly executing the steps S10-S11 until the top cutting of the two top cutting roadways 10 is completed;
s13, excavating two roof cutting roadways 10 at a position with a horizontal distance of A3 from the step S9, and executing the steps S8-S12;
and S14, repeatedly executing the step S13 until the top cutting of the whole working surface is completed.
In the embodiment, the depth d of the roof cutting is related to the supporting strength of the roadway, wherein when the supporting strength of the roadway is more than 0 and less than or equal to 0.5MPa, the depth d of the roof cutting is 0.8-1.0 time of the height of the caving zone; when the supporting strength of the roadway is more than 0.5MPa and less than or equal to 0.8MPa, the depth d of the roof cutting is 0.7-0.8 time of the height of the caving zone; when the supporting strength of the roadway is greater than 0.8MPa, the depth d of the roof cutting is 0.65-0.7 time of the height of the caving zone.
Example 2
In the embodiment, a certain mine near-empty working face of the same coal group is taken as an example, the thickness of a mined coal seam of the working face is 4m, the buried depth of the coal seam is 400m, and the height of a caving zone is 16 m. The working surface is basically covered by sandstone, the thickness is 8m, and the uniaxial compressive strength is 85 GPa. The width of the coal pillar on the side close to the air is 5m, the support strength of the hydraulic support on the working face is 0.8MPa, and the support strength of the stoping roadway is 0.45 MPa. In the present embodiment, the cutting depth is preferably 16 m.
The operation steps are as follows according to the parameters:
s1, cutting holes 1 in the coal seam;
s2, installing a hydraulic support 2 in the incision 1;
s3, repeatedly executing the step S2, and installing a plurality of hydraulic supports 2 in the incision;
s4, when the accumulated support width of the hydraulic support 2 installed in the cutting hole is 30m, stopping the continuous rock cutter 3 at the end of one end of the cutting hole 1 supported by the hydraulic support 2, and installing the hydraulic support on the whole cutting hole;
s5, starting the walking part 4, adjusting the machine body to be parallel to the coal wall 5, then starting the cutting tool 6 of the continuous rock cutter 3, horizontally rotating from one side to the other side, and then quickly rotating to the initial horizontal position of the cutting tool 6;
s6, moving the continuous rock cutting machine 3 by a distance of 8.0m to the other end of the cutting hole along the direction of the cutting hole central line 7 by adopting the walking part;
s7, repeatedly executing the steps S5-S6 until the top cutting of the whole cutting hole 1 is completed, and placing two continuous tunneling machines 8 at a distance of 24m in front of the cutting hole 1;
s8, adopting a continuous tunneling machine 8 to tunnel a roof cutting tunnel 10 with the width of 2.0m and the depth of 40m in a coal seam on the side 9 of the near-empty tunnel, and simultaneously adopting a continuous tunneling machine 8 to tunnel a roof cutting tunnel 10 with the width of 1.8m and the depth of 48m in a coal seam on the other side of the near-empty tunnel;
s9, stopping the two continuous rock cutters 3 at the open ends of the two roof cutting roadways 10 respectively, starting the walking parts 4, and adjusting the machine body to be parallel to the roadway walls;
s10, starting the cutting tools 6 of the two continuous rock cutters 3, horizontally rotating from one side to the other side at a uniform speed, and then quickly rotating to the initial horizontal position of the cutting tools 6;
s11, moving the two continuous rock cutters 3 by a distance of 9.6m along the other side of the roadway in the direction of the central line 7 of the roadway by adopting the walking part;
s12, repeatedly executing the steps S10-S11 until the two cut-top roadways 10 are excavated;
s13, executing steps S8-S12 at the position 24m away from the last topping roadway 10;
and S14, repeatedly executing the step S13 until the top cutting of the whole working surface is completed.
The technical solutions of the present invention are fully described above, it should be noted that the specific embodiments of the present invention are not limited by the above description, and all technical solutions formed by equivalent or equivalent changes in structure, method, or function according to the spirit of the present invention by those skilled in the art are within the scope of the present invention.
Claims (8)
1. A method for inducing a hard top plate of a working face to collapse by mechanical cutting is characterized by comprising the following steps:
s1, cutting holes in the coal seam;
s2, installing a hydraulic support in the incision;
s3, repeatedly executing the step S2, and installing a plurality of hydraulic supports in the incision;
s4, when the accumulated support width of the hydraulic support installed in the cutting hole is A1, stopping the continuous rock cutting machine at the end head of one end of the cutting hole supported by the hydraulic support, and meanwhile installing the hydraulic support on the whole cutting hole;
s5, starting a walking part, adjusting the machine body to be parallel to the coal wall, starting a cutting tool of the continuous rock cutting machine, horizontally rotating from one side to the other side, and then quickly rotating to the initial horizontal position of the cutting tool;
s6, moving the continuous rock cutter to the other end of the cutting hole along the central line direction of the roadway by a distance A2 by adopting a walking part;
s7, repeatedly executing the steps S5-S6 until the top cutting of the whole cutting hole is completed, and then placing two continuous tunneling machines at a position which is a distance A3 in front of the cutting hole;
s8, adopting the continuous tunneling machine to tunnel a tunnel with the width of L1 and the depth of D1 in a coal seam on the side of an adjacent empty tunnel, and simultaneously adopting the other continuous tunneling machine to tunnel a roof cutting tunnel with the width of L2 and the depth of D2 on the other side of the coal seam;
s9, stopping the two continuous rock cutters at the open ends of two top cutting roadways excavated by the continuous tunneling machine respectively, starting a walking part, and adjusting the machine body to be parallel to the roadway side;
s10, starting the cutting tools of the two continuous rock cutters, horizontally rotating from one side to the other side, and then quickly rotating to the initial horizontal position of the cutting tools;
s11, moving the two continuous rock cutters by a distance A4 along the other end of the roof cutting roadway in the direction of the central line of the roadway by adopting a walking part;
s12, repeatedly executing the steps S10-S11 until the top cutting of the two top cutting roadways is completed;
s13, excavating two roof cutting roadways at the position with the horizontal distance of A3 from the step S9, and executing the steps S8-S12;
and S14, repeatedly executing the step S13 until the top cutting of the whole working surface is completed.
2. The method for inducing the hard top plate of the working face to collapse through mechanical cutting according to claim 1, wherein the depth d of the top cut is related to roadway support strength, wherein when the roadway support strength is less than or equal to 0.5MPa, the depth d of the top cut is 0.8-1.0 time of the height of a collapse zone; when the supporting strength of the roadway is more than 0.5MPa and less than or equal to 0.8MPa, the depth d of the roof cutting is 0.7-0.8 time of the height of the caving zone; and when the roadway support strength is greater than 0.8MPa, the depth d of the roof cutting is 0.65-0.7 time of the height of the caving zone.
3. The method of claim 1, wherein the moving distance A2 is related to the hydraulic support strength of the cutting hole, wherein A2 is 0.6-0.65 times the depth of the top cut when 0< the hydraulic support strength ≦ 0.5 MPa; when the supporting strength of the hydraulic support is more than 0.5MPa and less than or equal to 1.0MPa, the A2 is 0.45-0.6 time of the depth of the cut top; when the supporting strength of the hydraulic support is more than 1.0MPa and less than or equal to 1.5MPa, the A2 is 0.4-0.45 time of the depth of the cut top; when the support strength of the hydraulic support is greater than 1.5MPa, the A2 is 0.3-0.4 time of the depth of the cut top.
4. The method for inducing hard roof caving of a working face by mechanical cutting as claimed in claim 1, wherein the cumulative support width A1 of the hydraulic support is related to the coal seam burial depth H, and is specifically related to the following relation: a1 ═ 20+ 2.5H/100.
5. The method of claim 1, wherein the distance A3 is related to the thickness of the basic crown, that is, A3 is 2-4 times the thickness of the basic crown.
6. The method for inducing caving of hard top plate of working face by mechanical cutting according to claim 1, wherein the width L1 of the cut top tunnel and the depth D1 of the continuous tunneling machine tunneled in the coal seam on one side of the face tunnel are related to the width of coal pillar and the buried depth of the coal seam, wherein when the width of the coal pillar is 30-60m or the buried depth of the coal seam is more than 800m, the width L1 of the cut top tunnel is 1.5-1.8m, and the depth D1 is 5-8 times of the thickness of the basic top; when the width of the coal pillar is 0-6m and the buried depth of the coal seam is less than 500m, the width L1 of the roof cutting roadway is 1.8-2.2m, and the depth D1 is 4-6 times of the thickness of the basic roof; in addition to the above conditions, the width L1 of the roof cutting roadway is 1.9-2.5m, and the depth D1 is 6-7 times the thickness of the immediate roof.
7. The method of claim 6, wherein the width L2 of the topping roadway and the depth D2 of the continuous roadheader tunneling on the other side of the coal seam are related to the coal seam burial depth, wherein when 0< the coal seam burial depth ≦ 300m, the width L2 of the topping roadway is 2.0-2.5m and the depth D2 is 6-8 times the direct roof thickness; when the buried depth of the coal seam is more than 300m and less than or equal to 800m, the width L2 of the roof cutting roadway is 1.8-2.0m, and the depth D2 is 5-6 times of the basic roof thickness; when the coal seam burial depth is more than 800m, the width L2 of the roof cutting roadway is 1.5-1.8m, and the depth D2 is 4-5 times of the basic roof thickness.
8. The method of claim 1, wherein the displacement distance A4 is related to the uniaxial compressive strength of the basic roof, wherein, when 0< the uniaxial compressive strength of the basic roof ≦ 60GPa, the displacement distance A4 is 0.4-0.45 times the depth of the roof cut; when 60GPa < the uniaxial compressive strength of the basic roof is less than or equal to 90GPa, the moving distance A4 is 0.45-0.6 times of the depth of the roof cutting; the displacement distance a4 is 0.6-0.65 times the cutting depth when the uniaxial compressive strength of the basic roof is >90 GPa.
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