CN115163066A - Rock burst mine roadway thick-layer bottom coal gangue inclusion blasting cracking combined pressure relief method - Google Patents

Rock burst mine roadway thick-layer bottom coal gangue inclusion blasting cracking combined pressure relief method Download PDF

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CN115163066A
CN115163066A CN202210749066.5A CN202210749066A CN115163066A CN 115163066 A CN115163066 A CN 115163066A CN 202210749066 A CN202210749066 A CN 202210749066A CN 115163066 A CN115163066 A CN 115163066A
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gangue
pressure relief
mine roadway
thick
drilling
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Inventor
薛成春
曹安业
郭文豪
马祥
温颖远
黄锐
王崧玮
白贤栖
曾海利
张德兵
张润兵
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Yiqi Branch Of Inner Mongolia Zhongtai Energy Co ltd
China University of Mining and Technology CUMT
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Yiqi Branch Of Inner Mongolia Zhongtai Energy Co ltd
China University of Mining and Technology CUMT
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Priority to CN202210749066.5A priority Critical patent/CN115163066A/en
Publication of CN115163066A publication Critical patent/CN115163066A/en
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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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Soil Sciences (AREA)
  • Remote Sensing (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

The invention discloses a rock burst mine roadway thick-layer bottom coal gangue blast cracking combined pressure relief method, which comprises the following steps: averagely dividing a region containing gangue of thick-layer bottom coal of a mine roadway into n stages; selecting a measuring point in each stage, and performing lithology measurement on a mine roadway bottom plate to obtain the gangue inclusion lithology and the gangue inclusion thickness of thick-layer bottom coal in each stage; dividing the region containing the gangue into different region grades; respectively formulating large-diameter drilling pressure relief scheme parameters and coal seam blasting pressure relief scheme parameters of different grade areas based on the area grades; and formulating large-diameter drilling and coal bed blasting pressure relief construction procedures in different grade areas based on the large-diameter drilling pressure relief scheme parameters and the coal bed blasting pressure relief scheme parameters to realize combined pressure relief of roadway thick-layer bottom coal gangue inclusion blasting cracking. The pressure relief effect of the rock burst mine roadway thick-layer bottom coal gangue inclusion region is effectively improved, the impact dynamic disaster risk caused by insufficient pressure relief force due to gangue inclusion is reduced, and the life safety factor of underground workers is improved.

Description

Rock burst mine roadway thick-layer bottom coal gangue inclusion blasting cracking combined pressure relief method
Technical Field
The invention relates to the technical field of coal mining and coal mine safety, in particular to a rock burst mine roadway thick-layer bottom coal gangue blasting and cracking combined pressure relief method.
Background
The coal seam roadway is a main occurrence area of the rock burst disaster, the tunneling work amount of the rock burst coal seam roadway is large, the personnel density is high, and once the rock burst accident occurs, the roadway is easily damaged and the personnel casualties easily occur. For a thick coal seam, the tunnel is reserved with bottom coal which is an inevitable technical problem, and when the structure of the coal seam is complex, the bottom coal of the tunnel has gangue with different thicknesses, so that the impact danger of the tunnel bottom plate is increased. At present, a method for drilling holes with large diameters on a bottom plate is generally adopted to drill holes in a region containing gangue in bottom coal for pressure relief, but the method has a good effect on a coal seam, has a poor pressure relief effect on rock strata such as gangue and cannot achieve the purpose of effective pressure relief. Meanwhile, the lithology and the thickness of the gangue are changed, so that the pressure relief effect of the conventional pressure relief method is further inhibited. How to make an effective bottom plate pressure relief scheme under the condition of constantly changing nature and thickness of gangue inclusion, and reducing the impact risk of a roadway reserved bottom coal area is urgent.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a combined pressure relief method for rock burst and cracking of thick-layer bottom coal of a mine roadway with rock burst, which comprises the steps of dividing a region containing rock burst of the thick-layer bottom coal of the mine roadway into a plurality of stages, selecting two measuring points in each stage to respectively measure the rock nature and the thickness of the rock burst to a roadway bottom plate in a drilling and coring mode, dividing the region containing the rock burst of the thick-layer bottom coal of the mine roadway into different rock burst grades according to the rock nature and the thickness of the rock burst, formulating pressure relief parameters of different rock burst grades, setting a construction program of a pressure relief scheme, and realizing the combined pressure relief of coal layer burst pressure relief and large-diameter pressure relief under the conditions of different rock burst grades. The pressure relief effect of the rock burst mine roadway thick-layer bottom coal gangue inclusion region is effectively improved, the impact dynamic disaster risk caused by insufficient pressure relief force due to gangue inclusion is reduced, and the life safety factor of underground workers is improved.
In order to achieve the technical purpose, the invention provides a blast rock pressure mine roadway thick-layer bottom coal gangue inclusion blasting and cracking combined pressure relief method, which comprises the following steps of:
s1, averagely dividing a region containing gangue of thick-layer bottom coal of a mine roadway into n stages;
s2, selecting a measuring point in each stage, and performing lithology measurement on the mine roadway bottom plate to obtain the gangue inclusion lithology and the gangue inclusion thickness of the thick-layer bottom coal in each stage;
s3, dividing the region containing the gangue into different region grades based on the gangue clamping lithology and the gangue clamping thickness;
s4, respectively formulating large-diameter drilling pressure relief scheme parameters and coal bed blasting pressure relief scheme parameters of areas with different grades based on the area grades;
and S5, formulating large-diameter drilling and coal seam blasting pressure relief construction procedures of different grade areas based on the large-diameter drilling pressure relief scheme parameters and the coal seam blasting pressure relief scheme parameters, and realizing combined pressure relief of roadway thick-layer bottom coal gangue inclusion blasting cracking.
Optionally, in S1, the length of the stage is 30 to 60m.
Optionally, in S2, the lithology measurement is performed on the mine roadway floor by drilling coring, and the vertical depth of the drilling coring is 15m.
Optionally, in S3, the calculation formula of the region level is:
W＝KH
in the formula, W represents the impact risk index of a thick-layer bottom coal gangue-containing region of a mine roadway; k represents the gangue property, the sandstone is 0.5, the sandy mudstone is 1.0, and the mudstone is 1.5; h represents the thickness of the clamped gangue.
Optionally, when W is more than 0 and less than or equal to 1.5, the region grade of the region containing the gangue is I grade;
when W is more than 1.5 and less than or equal to 4.5, the region grade of the region containing the gangue is level II;
when W is more than 4.5 and less than or equal to 9, the region grade of the region containing the gangue is III grade;
and when W is more than 9, the region grade of the region containing the gangue is IV grade.
Optionally, in S4, the process of formulating the large-diameter drilling pressure relief plan parameter and the coal seam blasting pressure relief plan parameter is as follows:
when the regional grade of the region containing the gangue is I grade: the bore diameter of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, the drilling trend interval is 2.0m, and the drilling depth is D 1 ；
When the regional grade of the region containing the gangue is level II: the bore diameter of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, and the drilling depth is D 1 (ii) a The diameter of a coal seam blast hole is 42mm, four holes are arranged, and the drilling depth is D 2 The single-hole loading amount is 0.5-1.0 kg, and the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway;
when the regional grade of the region containing the gangue is III grade: the bore diameter of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, and the drilling depth is D 1 (ii) a The diameter of a coal seam blast hole is 42mm, four holes are arranged, and the drilling depth is D 2 The single-hole loading amount is 1.0-2.0 kg, and the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway;
when the regional grade of the region containing the gangue is IV grade: the diameter of a coal seam blast hole is 42mm, three holes are arranged, and the drilling depth is D 2 The single-hole loading is 2.5kg, and the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway.
Optionally, the D 1 The calculation formula of (2) is as follows:
Figure BDA0003720558000000041
wherein S is the thickness of the thick bed coal, and alpha is the drilling angle.
Optionally, the D 2 The calculation formula of (c) is:
Figure BDA0003720558000000042
in the formula, S 1 The distance between the sandwiched rock and the bottom plate of the mine roadway is represented as H, the thickness of the sandwiched rock is represented as H, and the angle alpha is represented as a drilling angle.
The invention has the following technical effects:
the method comprises the steps of dividing a region containing the gangue in the thick-layer bottom coal of the mine tunnel into a plurality of stages, selecting two measuring points in each stage to respectively measure the nature and thickness of the gangue towards the bottom plate of the mine tunnel in a drilling and coring mode, dividing the region containing the gangue in the thick-layer bottom coal of the mine tunnel into different gangue clamping levels according to the nature and thickness of the gangue, setting pressure relief parameters of different gangue clamping levels, setting a construction program of a pressure relief scheme, and realizing combined pressure relief of coal layer blasting pressure relief and large-diameter pressure relief under the conditions of different gangue clamping levels. The pressure relief effect of the rock burst mine roadway thick-layer bottom coal gangue inclusion region is effectively improved, the impact dynamic disaster risk caused by insufficient pressure relief force due to gangue inclusion is reduced, and the life safety factor of underground workers is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a rock burst mine roadway thick-bed bottom coal gangue blast cracking combined pressure relief method according to an embodiment of the invention;
FIG. 2 is a schematic sectional view of the grading result of different gangue-containing regions according to the embodiment of the invention;
FIG. 3 is a schematic sectional view of the arrangement trend of a I-stage gangue-clamping combined pressure relief drilling hole in the embodiment of the invention;
FIG. 4 is a schematic plan view of a mine roadway with I-level gangue clamping combined pressure relief drill holes in the embodiment of the invention;
FIG. 5 is a schematic view of a section of a II-stage gangue clamping blasting combined pressure relief borehole arrangement in an embodiment of the invention;
FIG. 6 is a schematic plan view of a mine roadway arranged in a combined pressure relief drilling of the grade II gangue clamping blasting in the embodiment of the invention;
FIG. 7 is a schematic view of a section of a III-grade gangue charging blasting combined pressure relief borehole arrangement in an embodiment of the invention;
FIG. 8 is a schematic plan view of a mine roadway arranged in a combined pressure relief drilling of III-grade gangue blasting according to an embodiment of the invention;
FIG. 9 is a schematic view of a section of an arrangement of IV-grade gangue charging blasting combined pressure relief drill holes in the embodiment of the invention;
fig. 10 is a schematic plan view of a mine roadway with an iv-level gangue clamping blasting combined pressure relief drilling arrangement in the embodiment of the invention.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Examples
As shown in fig. 1, the invention discloses a rock burst and blast cracking combined pressure relief method for thick-layer bottom coal of a rock burst mine roadway, which comprises the following steps:
s1, averagely dividing a region containing gangue of thick-layer bottom coal of a mine roadway into n stages, wherein the length of each stage is L n ，L n Is 30 to 60m.
S2, selecting two measuring points in each stage, and performing lithology measurement on the mine roadway floor in a drilling coring mode to obtain the gangue inclusion lithology and the gangue inclusion thickness of the thick-layer bottom coal, the thickness S of the thick-layer bottom coal and the distance S between the gangue inclusion and the mine roadway floor in each stage 1 The vertical depth of core drilling was 15m.
And S3, dividing the region containing the gangue into different region grades based on the gangue inclusion lithology and the gangue inclusion thickness, wherein the division result of the region grades is shown in figure 2. The calculation formula of the region grade is as follows:
W＝KH
in the formula, W represents the impact risk index of a thick-layer bottom coal gangue-containing region of a mine roadway; k represents the gangue property, the sandstone is 0.5, the sandy mudstone is 1.0, and the mudstone is 1.5; h represents the thickness of the gangue.
When W is more than 0 and less than or equal to 1.5, the region grade of the region containing the gangue is I grade;
when W is more than 1.5 and less than or equal to 4.5, the region grade of the region containing the gangue is level II;
when W is more than 4.5 and less than or equal to 9, the region grade of the region containing the gangue is III grade;
and when W is more than 9, the region grade of the region containing the gangue is IV grade.
S4, respectively formulating large-diameter drilling pressure relief scheme parameters and coal seam blasting pressure relief scheme parameters of different grade areas based on the area grades;
when the regional grade of the region containing the gangue is I grade: the aperture of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, the interval of the drilling trend is 2.0m, and the drilling depth is
Figure BDA0003720558000000071
When the regional grade of the region containing the gangue is II grade: the aperture of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, and the drilling depth is
Figure BDA0003720558000000072
Figure BDA0003720558000000073
The diameter of a coal seam blast hole is 42mm, four holes are arranged, and the drilling depth is
Figure BDA0003720558000000074
The single-hole loading amount is 0.5-1.0 kg, and the drilling angle is alpha = -45-60 degrees along the trend of a mine roadway;
when the regional grade of the region containing the gangue is III grade: the bore diameter of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, and the drilling depth is
Figure BDA0003720558000000075
The diameter of a coal seam blast hole is 42mm, four holes are arranged, and the drilling depth is
Figure BDA0003720558000000076
The single-hole loading amount is 1.0-2.0 kg, and the drilling angle is alpha = -45-60 degrees along the trend of a mine roadway;
when the regional grade of the region containing the gangue is IV grade: the diameter of a coal seam blast hole is 42mm, three holes are arranged, and the drilling depth is
Figure BDA0003720558000000077
The single-hole loading is 2.5kg, and the drilling angle is alpha = -45-60 degrees along the mine roadway.
S5, based on the large-diameter drilling pressure relief scheme parameters and the coal seam blasting pressure relief scheme parameters, large-diameter drilling and coal seam blasting pressure relief construction procedures of different grade areas are formulated, and combined pressure relief of roadway thick-layer bottom coal gangue crack blasting is achieved, and the specific construction procedures are as follows:
when the regional grade of the region containing the gangue is I grade: large-diameter drilling is carried out for pressure relief, and coal bed blasting pressure relief is not carried out; the construction layout is shown in fig. 3 and 4.
When the regional grade of the region containing the gangue is level II: firstly, large-diameter drilling is carried out for pressure relief, and coal bed blasting pressure relief is carried out on two sides of the large-diameter pressure relief drilling; the construction layout is shown in fig. 5 and 6.
When the regional grade of the region containing the gangue is III grade: firstly, carrying out coal seam blasting pressure relief, carrying out large-diameter drilling pressure relief at the original position of a coal seam blasting pressure relief drilling hole, and carrying out secondary hole expansion on the coal seam blasting hole; the construction layout is shown in fig. 7 and 8.
When the regional grade of the region containing the gangue is IV grade: carrying out coal bed blasting pressure relief without carrying out large-diameter drilling pressure relief; the construction layout is shown in fig. 9 and 10.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. The rock burst mine roadway thick-layer bottom coal gangue blasting and cracking combined pressure relief method is characterized by comprising the following steps of:
s1, averagely dividing a region containing the gangue of thick-layer bottom coal of a mine roadway into n stages;
s2, selecting a measuring point in each stage, and performing lithology measurement on the mine roadway bottom plate to obtain the gangue inclusion lithology and the gangue inclusion thickness of the thick-layer bottom coal in each stage;
s3, dividing the region containing the gangue into different region grades based on the gangue inclusion lithology and the gangue inclusion thickness;
s4, respectively formulating large-diameter drilling pressure relief scheme parameters and coal seam blasting pressure relief scheme parameters of the regions with different grades based on the region grades;
and S5, formulating large-diameter drilling and coal seam blasting pressure relief construction procedures of different grade areas based on the large-diameter drilling pressure relief scheme parameters and the coal seam blasting pressure relief scheme parameters, and realizing combined pressure relief of roadway thick-layer bottom coal gangue inclusion blasting cracking.
2. The method for jointly relieving pressure by carrying out gangue blast and cracking on thick-layer bottom coal of a rock burst mine roadway according to claim 1, wherein the length of the stage in S1 is 30-60 m.
3. The combined pressure relief method for rock burst mine roadway thick-layer bottom coal gangue blast cracking according to claim 1,
and in the S2, lithology determination is carried out on the mine roadway bottom plate in a drilling coring mode, and the vertical depth of the drilling coring is 15m.
4. The method for jointly relieving pressure by carrying out gangue blast and cracking on thick-layer bottom coal of a rock burst mine roadway according to claim 1, wherein in the step S3, the calculation formula of the zone grade is as follows:
W＝KH
in the formula, W represents the impact risk index of a thick-layer bottom coal gangue-containing region of a mine roadway; k represents the gangue property, the sandstone is 0.5, the sandy mudstone is 1.0, and the mudstone is 1.5; h represents the thickness of the clamped gangue.
5. The combined pressure relief method for rock burst mine roadway thick-layer bottom coal gangue blast cracking according to claim 4,
when W is more than 0 and less than or equal to 1.5, the region grade of the region containing the gangue is I grade;
when W is more than 1.5 and less than or equal to 4.5, the region grade of the region containing the gangue is level II;
when W is more than 4.5 and less than or equal to 9, the region grade of the region containing the gangue is III grade;
and when W is more than 9, the region grade of the region containing the gangue is IV grade.
6. The method for jointly releasing pressure by carrying out gangue blasting and cracking on thick-layer bottom coal of a rock burst mine roadway according to claim 1, wherein in the step S4, the process for making the parameters of the large-diameter drilling pressure release scheme and the parameters of the coal bed blasting pressure release scheme comprises the following steps:
when the regional grade of the region containing the gangue is I grade: the bore diameter of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, the drilling trend interval is 2.0m, and the drilling depth is D 1 ；
When the regional grade of the region containing the gangue is level II: the bore diameter of the large-diameter drill hole is 150mm, three holes are arranged, the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway, and the drilling depth is D 1 (ii) a The diameter of a coal seam blast hole is 42mm, four holes are arranged, and the drilling depth is D 2 The single-hole loading amount is 0.5-1.0 kg, and the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway;
when the regional grade of the region containing the gangue is III grade: the bore diameter of the large-diameter drill hole is 150mm, three holes are arranged, and the drilling angle is alongThe trend of the mine roadway is alpha = -45-60 degrees, and the drilling depth is D 1 (ii) a The diameter of a coal seam blast hole is 42mm, four holes are arranged, and the drilling depth is D 2 The single-hole loading amount is 1.0-2.0 kg, and the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway;
when the regional grade of the region containing the gangue is IV grade: the diameter of a coal seam blast hole is 42mm, three holes are arranged, and the drilling depth is D 2 The single-hole loading is 2.5kg, and the drilling angle is alpha = -45-60 degrees along the trend of the mine roadway.
7. The combined pressure relief method for rock burst mine roadway thick-layer bottom coal gangue inclusion blasting and cracking according to claim 6, wherein D is 1 The calculation formula of (2) is as follows:
Figure FDA0003720557990000031
wherein S is the thickness of the thick bed coal, and alpha is the drilling angle.
8. The combined pressure relief method for rock burst mine roadway thick-layer bottom coal gangue inclusion blasting and cracking according to claim 6, wherein D is 2 The calculation formula of (2) is as follows:
Figure FDA0003720557990000032
in the formula, S 1 The distance between the clamping refuse and the bottom plate of the mine roadway is shown, H is the thickness of the clamping refuse, and alpha is the drilling angle.
CN202210749066.5A 2022-06-29 2022-06-29 Rock burst mine roadway thick-layer bottom coal gangue inclusion blasting cracking combined pressure relief method Pending CN115163066A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117552792A (en) * 2024-01-10 2024-02-13 北京科技大学 Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117552792A (en) * 2024-01-10 2024-02-13 北京科技大学 Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect
CN117552792B (en) * 2024-01-10 2024-03-22 北京科技大学 Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect

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