CN111577283B - Non-coal-pillar roadway retaining method based on mechanical cutting and composite blasting - Google Patents
Non-coal-pillar roadway retaining method based on mechanical cutting and composite blasting Download PDFInfo
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- CN111577283B CN111577283B CN202010569175.XA CN202010569175A CN111577283B CN 111577283 B CN111577283 B CN 111577283B CN 202010569175 A CN202010569175 A CN 202010569175A CN 111577283 B CN111577283 B CN 111577283B
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- 238000005422 blasting Methods 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 9
- 239000003245 coal Substances 0.000 claims description 35
- 238000005065 mining Methods 0.000 claims description 21
- 239000011435 rock Substances 0.000 claims description 14
- 241000233639 Pythium Species 0.000 claims description 9
- 238000009933 burial Methods 0.000 claims description 9
- 241001669573 Galeorhinus galeus Species 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000002596 correlated effect Effects 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 239000010878 waste rock Substances 0.000 abstract description 4
- 238000005474 detonation Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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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Abstract
The invention discloses a coal-pillar-free roadway retaining method based on mechanical cutting and composite blasting, which is used for coal-pillar-free roof-cutting roadway retaining and comprises the following steps: firstly, cutting a roadway roof by using a mine mechanical precision roof cutting machine; secondly, arranging a portal bracket support in a certain roof cutting range in front of the working face; and thirdly, drilling holes in the back of the working face between two cutting steps and placing a composite blasting tube. And (5) retaining the roadway after detonation in a certain range. And fourthly, repeatedly executing cutting, supporting and blasting entry retaining, and finally finishing the top cutting and entry retaining process of the whole working face. Compared with the prior art, the method has the advantages of simple operation, low cost, high safety, small damage to the top plate of the roadway and smooth and accurate cutting seam; the gob side waste rock wall of entry retaining is good from the stability, and the later stage is easily maintained.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a non-pillar roadway retaining method based on mechanical cutting and composite blasting.
Background
A large number of protective pillars, such as boundary protective pillars, zone protective pillars, and the like, may remain during mining of the mine face. The retention of these pillars not only causes resource waste, but also causes environmental problems and a series of mine disasters, such as uneven subsidence of the earth's surface, gas accumulation in goafs, and dynamic disasters of pillar instability. In order to solve the above problems, a pillar-free mining technique is one of effective approaches. However, at present, there are many problems faced by pillar-free mining, firstly, the operation processes of energy-gathering blasting drilling, charging, connecting and the like adopted are complex, and the mechanization degree is low; secondly, the top plate is broken after roof cutting, the self-stability of the caving rock is poor, and the roadway deformation is large; and thirdly, the deformation of the roadway at the front section of the working face is controlled after the roof is cut, and the roadway roof behind the working face cannot timely stride and fall. At present, a roof cutting method with high roof cutting efficiency, easy deformation control and timely roof span fall is urgently needed to ensure non-pillar mining.
Therefore, how to provide a coal pillar-free roadway keeping method based on mechanical cutting and composite blasting, which has the advantages of high roof cutting efficiency, small roadway keeping deformation and timely collapse and ensures coal pillar-free mining, is a problem to be solved by technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides a coal-pillar-free roadway retaining method based on mechanical cutting and composite blasting, which is used for coal-pillar-free roof cutting roadway retaining and comprises the following steps: firstly, cutting a roadway roof by using a mine mechanical precision roof cutting machine; secondly, arranging a portal bracket support in a certain roof cutting range in front of the working face; and thirdly, drilling holes in the back of the working face between two cutting steps and placing a composite blasting tube. And (5) retaining the roadway after detonation in a certain range. And fourthly, repeatedly executing cutting, supporting and blasting entry retaining, and finally finishing the top cutting and entry retaining process of the whole working face.
The coal-pillar-free roadway retaining method based on mechanical cutting and composite blasting specifically comprises the following steps:
1) arranging the mine mechanical precision top cutting machine at the end of the roadway, and arranging a cutting tool of the mine mechanical precision top cutting machine in parallel with the central line of the roadway by adopting a travelling mechanism;
2) starting a cutting tool of the accurate roof cutting machine of the mine machinery to rotate from a horizontal position at one side to a horizontal position at the other side at a uniform rotating speed;
3) starting the walking mechanism, and moving the accurate roof cutting machine of the mine machine to the other end of the roadway along the central line direction of the roadway for a certain distance S1;
4) and carrying out the steps 2) to 3) again, and then drilling a drill hole with the length of L1 and the radius of D at the middle position of the two times of mechanical top cutting;
5) uniformly arranging the portal supports with the working resistance of P in the roof cutting range of the roadway at the row spacing of S2;
6) repeatedly executing the steps 2) to 5) until the accumulated top cutting length in front of the working face is greater than S3 or the cutting of the whole roadway roof is completed;
7) propelling the working surface at a propulsion speed V;
8) repeatedly executing the step 6) until the length of the portal supports arranged in the goaf is greater than S4, and executing the next step;
9) then arranging composite blasting tubes with the length of L2 and the perforating bullet distance of L3 in 2 unexploded boreholes at the deepest part of the goaf, sealing the holes, and detonating the composite blasting tubes remotely;
10) spraying cement slurry on the collapsed gangue wall, and withdrawing the gate-type support of the gangue wall section;
11) and repeatedly executing steps 8) to 10);
12) and when the working face is pushed up, and simultaneously the withdrawing of the portal supports in the goaf is finished, stopping all the steps.
Preferably, the distance S1 moved by the accurate roof cutting machine of the mine machine in the step 3) is correlated with the uniaxial compressive strength and the roof cutting depth d of the roadway direct roof;
when 0< the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 15GPa, S1 is 1.3 d-1.5 d; when the uniaxial compressive strength of 15GPa < the direct roof of the roadway is less than or equal to 50GPa, S1 is 1.2 d-1.3 d; when the uniaxial compressive strength of the roadway direct roof is greater than 50GPa, L is 1.15 d.
Preferably, the drilling length L1 in the step 4) is set to be 0.95-1.2 times of the top cutting depth, and the radius D of the drilled hole is 70-80 mm.
Preferably, in the step 5), the working resistance P and the row spacing S2 of the portal frame are associated with the roof cutting depth d and the roadway burial depth;
when the embedding depth of the roadway is more than 500m, or the topping depth is more than 12m, P is 2500kN, and S2 is 1.2-2.0 m; when the tunnel burial depth is less than or equal to 500m and the roof cutting depth is less than or equal to 0 and less than or equal to 7.5m, P is 2000kN, and S2 is 1.8-2.4 m; when the tunnel buried depth is less than or equal to 500m, the roof cutting depth is less than or equal to 12m in the case of 7.5m, P is 1500kN, and S2 is 1.8-2.0 m.
Preferably, in the step 6), the cumulative cut-top length S3 in front of the working face is associated with the vertical stress of the surrounding rock where the roadway is located;
when the vertical stress of the surrounding rock where the roadway is located is more than 0 and less than or equal to 8MPa, S3 is set to be the top cutting depth of 3.0-4.0 times; when the vertical stress of the surrounding rock where the roadway is located is less than or equal to 25MPa at 8MPa, S4 is set to be the top cutting depth of 4.0-4.5 times; and when the vertical stress of the surrounding rock where the roadway is located is more than 25MPa, S3 is set to be 5.0-7.0 times of the crest-cutting depth.
Preferably, the advancing speed of the working face in the step 7) is set to be 7 m/day-10 m/day.
Preferably, in the step 8), the goaf arrangement portal support length S4 is correlated with the roof cutting depth d, the uniaxial compression strength of the roadway direct roof and the thickness of the mined coal seam;
when 0GPa < the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 30GPa, and the coal seam with the roof cutting depth of more than 3 times is thick, S4 is set to be the roof cutting depth of 3.0-4.0 times; when 0GPa < the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 30GPa, and the coal seam mining thickness is less than or equal to 3 times of the roof cutting depth, S4 is set to be 4.5-6.0 times of the roof cutting depth; when the uniaxial compressive strength of the direct roof of the roadway is greater than 30GPa, and the coal seam thickness of which the roof cutting depth is greater than 4 times is thick, S4 is set to be the roof cutting depth of 5.5-6.0 times; and when the uniaxial compressive strength of the direct roof of the roadway is greater than 30GPa and the coal seam mining thickness of which the roof cutting depth is less than or equal to 4 times, S4 is set to be the roof cutting depth of 4.5-5.5 times.
Preferably, in the step 9), the length L2 of the composite blasting tube is associated with the top-cutting depth d, and the perforating charge spacing L3 is associated with the direct Purchase coefficient.
Preferably, the specific relationship between the length L2 of the composite blasting tube and the topping depth d is as follows: l2 ═ 0.65d to 0.80 d;
the relationship between the perforating charge spacing L3 and the direct tophat coefficient is as follows: when the direct tope coefficient is 0< and is not more than 4, the perforating charge spacing L3 is set to be 150-200 mm; when the direct tope coefficient is 4< less than or equal to 7, the perforating charge spacing L3 is set to be 120-150 mm; when the direct tophat coefficient is greater than 7, the perforating charge spacing L3 is set to be 90-120 mm.
Preferably, the crest truncation depth d is associated with the direct tope coefficient and the coal seam mining thickness; when the direct roof Pythium coefficient is more than 0 and less than or equal to 6, the roof cutting depth d is set to be 2.5-3.0 times of the mining thickness of the coal bed; when the direct roof Pythium coefficient is less than or equal to 9 < 6 >, the roof cutting depth d is set to be 3.0-4.0 times of the coal seam mining thickness; and when the direct roof Pythium coefficient is greater than 9, the roof cutting depth d is set to be 4.0-6.0 times of the coal seam mining thickness.
Compared with the prior art, the invention has the following technical effects:
compared with the prior art, the method has the advantages of simple operation, low cost, high safety, small damage to the top plate of the roadway and smooth and accurate cutting seam; the gob side waste rock wall of entry retaining is good from the stability, and the later stage is easily maintained.
Drawings
Fig. 1 is a schematic cross-sectional view of a non-pillar roadway retaining method based on mechanical cutting and composite blasting according to the present invention;
FIG. 2 is a schematic layout of a working face of a non-pillar roadway retaining method based on mechanical cutting and composite blasting according to the present invention;
in the figure: 1. a precise roof cutter of a mine machine; 2. a roadway; 3. a traveling mechanism; 4. cutting a cutter; 5. a central line of the roadway; 6. drilling; 7. a door-type support; 8. a working surface; 9. a composite blasting tube; 10. a waste rock wall.
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
Referring to fig. 1, a coal-pillar-free roadway retaining method based on mechanical cutting and composite blasting is used for coal-pillar-free roof-cutting roadway retaining, and specifically comprises the following steps:
1) arranging the accurate mine machinery top cutting machine 1 at the end of the roadway 2, and arranging a cutting tool 4 of the accurate mine machinery top cutting machine 1 in parallel with the central line 5 of the roadway by adopting a travelling mechanism 3;
2) starting a cutting tool 4 of the accurate roof cutting machine 1 of the mine machinery to rotate from a horizontal position at one side to a horizontal position at the other side at a uniform rotating speed;
3) starting the travelling mechanism 3, and moving the accurate roof cutting machine 1 of the mine machine to the other end of the roadway 2 along the direction of the central line 5 of the roadway for a certain distance S1;
4) and performing the steps 2) to 3) again, and then drilling a drill hole 6 with the length of L1 and the radius of D at the middle position of the two mechanical top cutting;
5) uniformly arranging the portal supports 7 with the working resistance P in the roof cutting range of the roadway 2 at the row spacing of S2;
6) repeatedly executing the steps 2) -5) until the accumulated top cutting length in front of the working face 8 is greater than S3 or the cutting of the top plate of the whole roadway 2 is completed;
7) advancing the work surface 8 at an advancing speed V;
8) repeatedly executing the step 6) until the length of the portal support 7 arranged in the goaf is greater than S4, and executing the next step;
9) then arranging composite blasting tubes 9 with the length of L2 and the perforating bullet distance of L3 in 2 unexploded boreholes 6 at the deepest part of the goaf, and detonating the composite blasting tubes 9 remotely after hole sealing;
10) spraying cement slurry on the collapsed gangue wall 10, and withdrawing the gate-type support 6 of the gangue wall section;
11) and repeatedly executing steps 8) to 10);
12) and when the working face 8 is pushed completely and the withdrawing of the portal supports in the goaf is completed, stopping all the steps.
In the example, the distance S1 moved by the mine mechanical precision top cutting machine 1 in the step 3) is related to the uniaxial compressive strength and the top cutting depth d of the roadway direct top;
when 0< the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 15GPa, S1 is 1.3 d-1.5 d; when the uniaxial compressive strength of 15GPa < the direct roof of the roadway is less than or equal to 50GPa, S1 is 1.2 d-1.3 d; when the uniaxial compressive strength of the roadway direct roof is greater than 50GPa, L is 1.15 d.
In this example, the length L1 of the drill 6 in the step 4) is set to 0.95-1.2 times the cutting depth, and the radius D of the drill 6 is 70-80 mm.
In the present example, in the step 5), the working resistance P and the row spacing S2 of the portal frame 7 are associated with the roof cutting depth d and the roadway burial depth;
when the tunnel burial depth is more than 500m, or the roof cutting depth is more than 12m, P is 2500kN, and S2 is 1.2-2.0 m; when the tunnel burial depth is less than or equal to 500m and the roof cutting depth is less than or equal to 0 and less than or equal to 7.5m, P is 2000kN, and S2 is 1.8-2.4 m; when the tunnel buried depth is less than or equal to 500m, the roof cutting depth is less than or equal to 12m in the case of 7.5m, P is 1500kN, and S2 is 1.8-2.0 m.
In the present example, in the step 6), the cumulative cut-top length S3 in front of the working face 8 is associated with the vertical stress of the surrounding rock where the roadway is located;
when the vertical stress of the surrounding rock where the roadway is located is more than 0 and less than or equal to 8MPa, S3 is set to be the top cutting depth of 3.0-4.0 times; when the vertical stress of the surrounding rock where the roadway is located is less than or equal to 25MPa at 8MPa, S4 is set to be the top cutting depth of 4.0-4.5 times; and when the vertical stress of the surrounding rock where the roadway is located is more than 25MPa, S3 is set to be 5.0-7.0 times of the crest-cutting depth.
In this example, the advancing speed of the working face 8 in the step 7) is set to 7 m/day to 10 m/day.
In the example, in the step 8), the length S4 of the goaf arrangement portal support 7 is related to the roof cutting depth d, the uniaxial compression strength of the roadway direct roof and the thickness of the mined coal seam;
when 0GPa < the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 30GPa, and the coal seam with the roof cutting depth of more than 3 times is thick, S4 is set to be the roof cutting depth of 3.0-4.0 times; when 0GPa < the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 30GPa, and the coal seam mining thickness is less than or equal to 3 times of the roof cutting depth, S4 is set to be 4.5-6.0 times of the roof cutting depth; when the uniaxial compressive strength of the direct roof of the roadway is greater than 30GPa, and the coal seam thickness of which the roof cutting depth is greater than 4 times is thick, S4 is set to be the roof cutting depth of 5.5-6.0 times; and when the uniaxial compressive strength of the direct roof of the roadway is greater than 30GPa and the coal seam mining thickness of which the roof cutting depth is less than or equal to 4 times, S4 is set to be the roof cutting depth of 4.5-5.5 times.
In this example, the length L2 of the composite blast tube 9 is associated with the cut top depth d and the interval L3 is associated with the direct tophat coefficient in step 9).
In this example, the length L2 of the composite blasting tube 9 is related to the cutting depth d as follows: l2 ═ 0.65d to 0.80 d;
the relationship between the perforating charge spacing L3 and the direct tophat coefficient is as follows: when the direct tope coefficient is 0< and is not more than 4, the perforating charge spacing L3 is set to be 150-200 mm; when the direct tope coefficient is 4< less than or equal to 7, the perforating charge spacing L3 is set to be 120-150 mm; when the direct tophat coefficient is greater than 7, the perforating charge spacing L3 is set to be 90-120 mm.
In this example, the crest depth d is associated with the direct jack-puls coefficient and the coal seam mining thickness; when the direct roof Pythium coefficient is more than 0 and less than or equal to 6, the roof cutting depth d is set to be 2.5-3.0 times of the mining thickness of the coal bed; when the direct roof Pythium coefficient is less than or equal to 9 < 6 >, the roof cutting depth d is set to be 3.0-4.0 times of the coal seam mining thickness; and when the direct roof Pythium coefficient is greater than 9, the roof cutting depth d is set to be 4.0-6.0 times of the coal seam mining thickness.
Example 2
In this embodiment, an adjacent empty roadway of a certain mine in the same coal group is taken as an example, the width of the roadway is 4.5m, and the height of the roadway is 4.0 m. The tunnel burial depth is 350m, the vertical stress of the surrounding rock is 10MPa, the uniaxial compressive strength of the direct roof is 80GPa, the Prussian coefficient is 8, the coal seam mining thickness is 4m, and the roof cutting depth is 14 m. The specific operation process according to the above conditions is as follows:
1) arranging the accurate mine machinery top cutting machine 1 at the end of the roadway 2, and arranging a cutting tool 4 of the accurate mine machinery top cutting machine 1 in parallel with the central line 5 of the roadway by adopting a travelling mechanism 3;
2) starting a cutting tool 4 of the accurate roof cutting machine 1 of the mine machinery to rotate from a horizontal position at one side to a horizontal position at the other side at a uniform rotating speed;
3) starting the travelling mechanism 3, and moving the accurate roof cutting machine 1 of the mine machine to the other end of the roadway 2 along the direction of the central line 5 of the roadway for a certain distance of 16.1 m;
4) and carrying out the steps 2) to 3) again, and then drilling a drill hole 6 with the length of 16.8m and the radius of 75mm at the middle position of the two times of mechanical top cutting;
5) uniformly arranging the gate-type supports 7 with the working resistance of 2500kN in the roof cutting range of the roadway 2 at a row spacing of 1.9 m;
6) repeatedly executing the steps 2) -5) until the accumulated top cutting length in front of the working surface 8 is greater than 56m or the cutting of the whole top plate of the roadway 2 is finished;
7) propelling the working surface 8 at a propelling speed of 8 m/day;
8) repeatedly executing the step 6) until the length of the portal support 7 arranged in the goaf is more than 70m, and executing the next step;
9) then arranging composite blasting tubes 9 with the length of 11.2m and the perforating bullet distance of 100mm in 2 unexploded boreholes 6 at the deepest part of the goaf, and detonating the composite blasting tubes 9 remotely after hole sealing;
10) spraying cement slurry on the collapsed gangue wall 10, and withdrawing the gate-type support 6 of the gangue wall section;
11) and repeatedly executing steps 8) to 10);
12) and when the working face 8 is pushed completely and the withdrawing of the portal supports in the goaf is completed, stopping all the steps.
Compared with the prior art, the method has the advantages of simple operation, low cost, high safety, small damage to the top plate of the roadway and smooth and accurate cutting seam; the gob side waste rock wall of entry retaining is good from the stability, and the later stage is easily maintained.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (10)
1. A coal-pillar-free roadway retaining method based on mechanical cutting and composite blasting is used for coal-pillar-free roof-cutting roadway retaining and is characterized by comprising the following steps:
1) arranging the mine mechanical precision top cutting machine (1) at the end of the roadway (2), and arranging a cutting tool (4) of the mine mechanical precision top cutting machine (1) in parallel with the central line (5) of the roadway by adopting a travelling mechanism (3);
2) starting a cutting tool (4) of the accurate top cutting machine (1) of the mine machinery, and rotating from a horizontal position at one side to a horizontal position at the other side at a uniform rotating speed;
3) starting the travelling mechanism (3), and moving the accurate roof cutting machine (1) of the mine machine to the other end of the roadway (2) for a certain distance S1 along the direction of the central line (5) of the roadway;
4) and performing the steps 2) to 3) again, and then drilling a drill hole (6) with the length of L1 and the radius of D at the middle position of the two mechanical top cutting;
5) uniformly arranging the door type supports (7) with the working resistance P in the top cutting range of the roadway (2) at the row spacing of S2;
6) repeatedly executing the steps 2) to 5) until the accumulated top cutting length in front of the working face (8) is greater than S3 or the roof of the whole roadway (2) is cut;
7) -propelling the work surface (8) at a propulsion speed V;
8) repeatedly executing the step 6) until the length of the portal support (7) arranged in the goaf is greater than S4, and executing the next step;
9) then arranging composite blasting tubes (9) with the length of L2 and the perforating charge spacing of L3 in 2 unexploded boreholes (6) at the deepest part of the goaf, and detonating the composite blasting tubes (9) remotely after hole sealing;
10) spraying cement slurry on the collapsed gangue wall (10), and withdrawing the gate-type support (7) of the gangue wall section;
11) and repeatedly executing steps 8) to 10);
12) and when the working face (8) is pushed completely and the withdrawing of the portal supports in the goaf is completed, stopping all the steps.
2. The coal-pillar-free roadway keeping method based on mechanical cutting and composite blasting according to claim 1, wherein the distance S1 moved by the mine mechanical precision top cutting machine (1) in the step 3) is correlated with the uniaxial compressive strength and the top cutting depth d of the roadway direct top;
when 0< the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 15GPa, S1 is 1.3 d-1.5 d; when the uniaxial compressive strength of 15GPa < the direct roof of the roadway is less than or equal to 50GPa, S1 is 1.2 d-1.3 d; when the uniaxial compressive strength of the roadway direct roof is greater than 50GPa, L is 1.15 d.
3. The coal-pillar-free roadway keeping method based on mechanical cutting and composite blasting according to claim 1, wherein the length L1 of the drill hole (6) in the step 4) is set to be 0.95-1.2 times of the crest cutting depth, and the radius D of the drill hole (6) is 70-80 mm.
4. The coal-pillar-free roadway keeping method based on mechanical cutting and composite blasting according to claim 2, characterized in that in the step 5), the working resistance P and the row spacing S2 of the portal supports (7) are related to the roof cutting depth d and the roadway burial depth;
when the tunnel burial depth is more than 500m, or the roof cutting depth is more than 12m, P is 2500kN, and S2 is 1.2-2.0 m; when the tunnel burial depth is less than or equal to 500m and the roof cutting depth is less than or equal to 0 and less than or equal to 7.5m, P is 2000kN, and S2 is 1.8-2.4 m; when the tunnel buried depth is less than or equal to 500m, the roof cutting depth is less than or equal to 12m in the case of 7.5m, P is 1500kN, and S2 is 1.8-2.0 m.
5. The method for coal pillar-free roadway keeping based on mechanical cutting and composite blasting according to claim 1, characterized in that in the step 6), the cumulative cut top length S3 in front of the working face (8) is related to the vertical stress of the surrounding rock where the roadway is located;
when the vertical stress of the surrounding rock where the roadway is located is more than 0 and less than or equal to 8MPa, S3 is set to be the top cutting depth of 3.0-4.0 times; when the vertical stress of the surrounding rock where the roadway is located is less than or equal to 25MPa at 8MPa, S4 is set to be the top cutting depth of 4.0-4.5 times; and when the vertical stress of the surrounding rock where the roadway is located is more than 25MPa, S3 is set to be 5.0-7.0 times of the crest-cutting depth.
6. The coal-pillar-free roadway keeping method based on mechanical cutting and composite blasting according to claim 1, wherein the advancing speed of the working face (8) in the step 7) is set to be 7 m/day-10 m/day.
7. The method for coal pillar-free roadway entry based on mechanical cutting and composite blasting according to claim 2, wherein in the step 8), the goaf arrangement portal support (7) length S4 is related to the roof cutting depth d, uniaxial compression strength of the roadway direct roof and thickness of the mined coal seam;
when 0GPa < the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 30GPa, and the coal seam with the roof cutting depth of more than 3 times is thick, S4 is set to be the roof cutting depth of 3.0-4.0 times; when 0GPa < the uniaxial compressive strength of the direct roof of the roadway is less than or equal to 30GPa, and the coal seam mining thickness is less than or equal to 3 times of the roof cutting depth, S4 is set to be 4.5-6.0 times of the roof cutting depth; when the uniaxial compressive strength of the direct roof of the roadway is greater than 30GPa, and the coal seam thickness of which the roof cutting depth is greater than 4 times is thick, S4 is set to be the roof cutting depth of 5.5-6.0 times; and when the uniaxial compressive strength of the direct roof of the roadway is greater than 30GPa and the coal seam mining thickness of which the roof cutting depth is less than or equal to 4 times, S4 is set to be the roof cutting depth of 4.5-5.5 times.
8. The method for coal pillar-free roadway entry based on mechanical cutting and composite blasting according to claim 2, wherein in the step 9), the length L2 of the composite blasting tube (9) is associated with the top cutting depth d, and the interval L3 of the perforating charges is associated with the direct Purchase coefficient.
9. The coal-pillar-free roadway keeping method based on mechanical cutting and composite blasting according to claim 8, characterized in that the specific relation between the length L2 of the composite blasting tube (9) and the crest-cutting depth d is as follows: l2 ═ 0.65d to 0.80 d;
the relationship between the perforating charge spacing L3 and the direct tophat coefficient is as follows: when the direct tope coefficient is 0< and is not more than 4, the perforating charge spacing L3 is set to be 150-200 mm; when the direct tope coefficient is 4< less than or equal to 7, the perforating charge spacing L3 is set to be 120-150 mm; when the direct tophat coefficient is greater than 7, the perforating charge spacing L3 is set to be 90-120 mm.
10. The non-pillar roadway method based on mechanical cutting and composite blasting according to any one of claims 2 and 9, wherein the roof cutting depth d is related to the direct tope ratio and the thickness of the mined coal bed; when the direct roof Pythium coefficient is more than 0 and less than or equal to 6, the roof cutting depth d is set to be 2.5-3.0 times of the thickness of the mined coal bed; when the direct roof Pythium coefficient is less than or equal to 9 < 6 >, the roof cutting depth d is set to be 3.0-4.0 times of the thickness of the mined coal bed; and when the direct roof Pythium coefficient is greater than 9, the roof cutting depth d is set to be 4.0-6.0 times of the thickness of the mined coal bed.
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