CN110552700B - Top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting - Google Patents

Top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting Download PDF

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CN110552700B
CN110552700B CN201910832463.7A CN201910832463A CN110552700B CN 110552700 B CN110552700 B CN 110552700B CN 201910832463 A CN201910832463 A CN 201910832463A CN 110552700 B CN110552700 B CN 110552700B
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blasting
stope
face
drill hole
determining
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CN110552700A (en
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高晓进
徐刚
张震
黄志增
李春睿
潘俊峰
李正杰
刘前进
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Tiandi Science and Technology Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C37/00Other methods or devices for dislodging with or without loading
    • E21C37/06Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/14Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids

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Abstract

The invention discloses a top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting, wherein the method comprises the steps of obtaining mining face parameters; determining the position parameters of blasting drill holes according to the stope face parameters; the blasting drilling position parameters comprise blasting drilling position parameters on the main roadway side and blasting drilling position parameters on the stoping line side; determining the blasting drill hole according to the position parameter of the blasting drill hole; the blasting drill hole is used for placing a carbon dioxide fracturing device; and blasting by using the carbon dioxide fracturing device at the blasting drill hole to determine the top plate crack. The invention provides a top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting, and solves the problem of potential safety hazard in a method for improving the stress environment of a main roadway near a mining area in the prior art.

Description

Top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting
Technical Field
The invention relates to the technical field of mine safety, in particular to a top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting.
Background
In the working face extraction process, the influence range of the advanced bearing pressure is large and severe. If main roadway protection coal pillars near the mining area are reserved with small sizes and are influenced by mining pressure, the main roadway near the mining area is prone to serious deformation, the whole approach quantity of surrounding rocks is large, the roadway overhaul engineering quantity is increased, and the maintenance cost is increased. Main roadways near mining areas usually undertake transportation, pedestrian, ventilation and other tasks of a full mining area, once the roadways are seriously damaged, the safety management difficulty of a mining area top plate is increased, and safe and efficient production of a mine is seriously restricted.
In the prior art, a method for improving the stress environment of a main roadway near a mining area is to adopt explosive deep hole presplitting blasting on a roadway protection coal pillar top plate, artificially manufacture a top plate crack and prevent forward propagation of advanced bearing pressure. Although the method can reduce the deformation of surrounding rocks of the roadway, for a high-gas mine, a large amount of gas is easy to accumulate in a goaf, and the safety production of the mine is seriously threatened by blasting with explosives.
Disclosure of Invention
The invention aims to provide a top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting, and solves the problem of potential safety hazard in a method for improving the stress environment of a main roadway near a mining area in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
a top plate deep surrounding rock pressure relief method based on carbon dioxide blasting comprises the following steps:
acquiring mining face parameters; the stope face parameters comprise the height of a basic top hard layer, the width of a roadway protection coal pillar, the width of a limit balance area, the mining height of a stope face, the caving rock mass crushing and swelling coefficient of a goaf, the coal seam inclination angle and the stope face inclination length;
determining the position parameters of blasting drill holes according to the stope face parameters; the blasting drilling position parameters comprise blasting drilling position parameters on the main roadway side and blasting drilling position parameters on the stoping line side; the position parameters comprise a top cutting height, a drilling hole length and a drilling hole inclination angle;
determining the blasting drill hole according to the position parameter of the blasting drill hole; the blasting drill hole is used for placing a carbon dioxide fracturing device;
and blasting by using the carbon dioxide fracturing device at the blasting drill hole to determine the top plate crack.
Optionally, determining a blasting drill hole position parameter according to the stope face parameter specifically includes:
determining blasting drilling hole position parameters of the main roadway side in the stoping working face according to the stoping working face parameters;
and determining the blasting drill hole position parameters of the stope mining line side of the stope mining face according to the stope mining face parameters.
Optionally, determining a blasting drilling position parameter of the main roadway side in the stope face according to the stope face parameter specifically includes:
using formulas
Figure BDA0002191158320000021
Determining the blasting long drilling length of the main roadway side in the stoping working face; l is1For blasting long bore lengths, h, of the main roadway sides in the stope face1The roof cutting height of the blasting long drill hole on the main roadway side in the stoping working face is defined as l, and l is the difference between the width of the roadway protection coal pillar and the width of the limit balance area;
using formulas
Figure BDA0002191158320000022
Determining the blasting long drilling hole inclination angle of the main roadway side in the stoping working face; alpha is alpha1The blast long drilling hole inclination angle of the main roadway side in the stoping working face is set;
using the formula h2=0.75h1Determining the crest cutting height of the blasting short drill hole on the main roadway side in the stoping working face; h is2The crest cutting height of the blasting short drill hole on the main roadway side in the stoping working face is set;
using formulas
Figure BDA0002191158320000023
Determining the blasting short drill hole length of the main roadway side in the stoping working face; l is2The length of the blasting short borehole on the main roadway side in the stoping face is obtained;
using formulas
Figure BDA0002191158320000024
Determine what isBlasting short drill hole inclination angles on the main roadway side in the stoping working face; alpha is alpha2And the blasting short drill hole inclination angle of the main roadway side in the stoping working face is adopted.
Optionally, determining the blasting drill hole position parameter of the stope side of the stope according to the stope face parameter specifically includes:
using formulas
Figure BDA0002191158320000031
Determining the crest cutting height of the blasting long drill hole on the stoping line side of the stoping working face; wherein h is3The top cutting height of the blasting long drill hole on the stope mining line side of the stope face is defined, and M is the mining height of the stope face; k is the broken expansion coefficient of the caving rock mass in the goaf, and theta is the inclination angle of the coal bed;
using formulas
Figure BDA0002191158320000032
Determining the blasting long drilling length of the stope mining line side of the stope mining face; l is3The length of the blasting long drill hole on the stope mining line side of the stope mining face is L, and the L is the stope mining face inclination length;
using formulas
Figure BDA0002191158320000033
Determining the blasting long drilling hole inclination angle of the stope mining line side of the stope mining face; alpha is alpha3The blasting long drilling hole inclination angle of the stope line side of the stope face is set;
using formulas
Figure BDA0002191158320000034
Determining the crest cutting height of the blasting short drill hole on the stoping line side of the stoping working face; h is4The top cutting height of the blasting short drill hole at the stoping line side of the stoping working face is set;
using formulas
Figure BDA0002191158320000035
Determining the blasting short drilling hole length of the stope mining line side of the stope mining face; l is4The length of the blasting short drill hole on the stope mining line side of the stope mining face is determined;
using formulas
Figure BDA0002191158320000036
Determining the blasting short drill hole inclination angle of the stope line side of the stope face; alpha is alpha4And the blasting short drill hole inclination angle of the stope line side of the stope face is set.
Optionally, after determining the blasting drill hole position parameter according to the stope face parameter, the method further includes:
determining a blasting section and a non-blasting section according to the blasting drill hole; the non-blasting section is arranged in the surrounding rock of the front blasting drilling section; the blasting section is arranged in the surrounding rock of the blasting drilling rear section.
A roof deep wall rock pressure relief system based on carbon dioxide blasting includes:
the stope face parameter acquisition module is used for acquiring stope face parameters; the stope face parameters comprise the height of a basic top hard layer, the width of a roadway protection coal pillar, the width of a limit balance area, the mining height of a stope face, the caving rock mass crushing and swelling coefficient of a goaf, the coal seam inclination angle and the stope face inclination length;
the blasting drilling position parameter determining module is used for determining blasting drilling position parameters according to the stope face parameters; the blasting drilling position parameters comprise blasting drilling position parameters on the main roadway side and blasting drilling position parameters on the stoping line side; the position parameters comprise a top cutting height, a drilling hole length and a drilling hole inclination angle;
the blasting drill hole determining module is used for determining blasting drill holes according to the position parameters of the blasting drill holes; the blasting drill hole is used for placing a carbon dioxide fracturing device;
and the top plate crack determining module is used for blasting by utilizing the carbon dioxide fracturing device at the blasting drill hole to determine the top plate crack.
Optionally, the module for determining the location parameter of the blast hole specifically includes:
the blasting drilling position parameter determining unit at the main roadway side is used for determining the blasting drilling position parameter at the main roadway side in the stope face according to the stope face parameter;
and the blasting drill hole position parameter determining unit at the stope line side is used for determining the blasting drill hole position parameter at the stope line side of the stope face according to the stope face parameter.
Optionally, the method further includes:
the blasting section and non-blasting section determining module is used for determining a blasting section and a non-blasting section according to the blasting drill hole; the non-blasting section is arranged in the surrounding rock of the front blasting drilling section; the blasting section is arranged in the surrounding rock of the blasting drilling rear section.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a top plate deep surrounding rock pressure relief method and a top plate deep surrounding rock pressure relief system based on carbon dioxide blasting, wherein the method determines blasting drilling hole position parameters according to parameters of a stope face, a top plate crack is determined by detonating a carbon dioxide fracturing device in a blasting drilling hole, forward propagation of advanced bearing pressure is blocked, and the carbon dioxide blasting belongs to a physical fracturing process, so that target rock mass can be directionally fractured in a segmented mode, the surrounding rock at the shallow part of a roadway is prevented from generating separation layer deformation, and the safety of the roadway of a mine is ensured.
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 schematic flow chart of a top plate deep surrounding rock pressure relief method based on carbon dioxide blasting provided by the invention;
FIG. 2 is a drilling plan view of a top plate deep surrounding rock pressure relief method based on carbon dioxide blasting provided by the invention;
FIG. 3 is a sectional view A-A of a working surface of a top plate deep surrounding rock pressure relief method based on carbon dioxide blasting provided by the invention;
FIG. 4 is a B-B section view of a working surface of a top plate deep surrounding rock pressure relief method based on carbon dioxide blasting provided by the invention;
fig. 5 is a schematic structural view of a top plate deep surrounding rock pressure relief system based on carbon dioxide blasting.
Reference numerals: 1-stope face, 2-face stope line, 3-main body roadway in stope face, 4-face haulage roadway, 5-face track roadway, 6-blasting long drill hole, 7-face overburden, 8-coal bed, 9-blasting short drill hole, 501-stope face parameter acquisition module, 502-blasting drill hole position parameter determination module, 503-blasting drill hole determination module and 504-roof crack determination module.
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.
The invention aims to provide a top plate deep surrounding rock pressure relief method and system based on carbon dioxide blasting, and solves the problem of potential safety hazard in a method for improving the stress environment of a main roadway near a mining area in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic flow diagram of a pressure relief method for a top plate deep surrounding rock based on carbon dioxide blasting, and as shown in fig. 1, the pressure relief method for the top plate deep surrounding rock based on carbon dioxide blasting comprises the following steps:
s101, acquiring mining face parameters; the stope face parameters comprise the height of a basic top hard layer, the width of a roadway protecting coal pillar, the width of a limit balance area, the mining height of a stope face, the caving rock mass crushing and swelling coefficient of a goaf, the coal seam inclination angle and the stope face inclination length.
S102, determining the position parameters of blasting drill holes according to the stope face parameters; the blasting drilling position parameters comprise blasting drilling position parameters on the main roadway side and blasting drilling position parameters on the stoping line side; the location parameters include a crest height, a borehole length, and a borehole inclination.
S103, determining the blasting drill hole according to the position parameter of the blasting drill hole; the blasting drill hole is used for placing a carbon dioxide fracturing device.
And S104, blasting at the blasting drill hole by using the carbon dioxide fracturing device to determine a top plate crack.
Wherein, according to stope face parameter, confirm blasting drilling position parameter, specifically include:
and determining blasting drilling hole position parameters of the main roadway side in the stoping working face according to the stoping working face parameters.
And determining the blasting drill hole position parameters of the stope mining line side of the stope mining face according to the stope mining face parameters.
Determining blasting drilling hole position parameters of the main roadway side in the stope face according to the stope face parameters, and specifically comprising the following steps:
using formulas
Figure BDA0002191158320000061
Determining the blasting long drilling length of the main roadway side in the stoping working face; l is1For blasting long bore lengths, h, of the main roadway sides in the stope face1The roof cutting height of the blasting long drill hole on the main roadway side in the stoping working face is defined as l, and l is the difference between the width of the roadway protection coal pillar and the width of the limit balance area;
using formulas
Figure BDA0002191158320000062
Determining the blasting long drilling hole inclination angle of the main roadway side in the stoping working face; alpha is alpha1The blast long drilling hole inclination angle of the main roadway side in the stoping working face is set;
using the formula h2=0.75h1Determining the crest cutting height of the blasting short drill hole on the main roadway side in the stoping working face; h is2The crest cutting height of the blasting short drill hole on the main roadway side in the stoping working face is set;
using formulas
Figure BDA0002191158320000063
Determining the blasting short drill hole length of the main roadway side in the stoping working face; l is2The length of the blasting short borehole on the main roadway side in the stoping face is obtained;
using formulas
Figure BDA0002191158320000071
Determining the blasting short drill hole inclination angle of the main roadway side in the stoping working face; alpha is alpha2And the blasting short drill hole inclination angle of the main roadway side in the stoping working face is adopted.
The method for determining the blasting drill hole position parameters of the stope mining line side of the stope mining face according to the stope mining face parameters specifically comprises the following steps:
using formulas
Figure BDA0002191158320000072
Determining the crest cutting height of the blasting long drill hole on the stoping line side of the stoping working face; wherein h is3The top cutting height of the blasting long drill hole on the stope mining line side of the stope face is defined, and M is the mining height of the stope face; k is the broken expansion coefficient of the caving rock mass in the goaf, and theta is the inclination angle of the coal bed;
using formulas
Figure BDA0002191158320000073
Determining the blasting long drilling length of the stope mining line side of the stope mining face; l is3For said stope faceThe blasting long drilling length at the stoping line side, and L is the stoping face inclination length;
using formulas
Figure BDA0002191158320000074
Determining the blasting long drilling hole inclination angle of the stope mining line side of the stope mining face; alpha is alpha3The blasting long drilling hole inclination angle of the stope line side of the stope face is set;
using formulas
Figure BDA0002191158320000075
Determining the crest cutting height of the blasting short drill hole on the stoping line side of the stoping working face; h is4The top cutting height of the blasting short drill hole at the stoping line side of the stoping working face is set;
using formulas
Figure BDA0002191158320000076
Determining the blasting short drilling hole length of the stope mining line side of the stope mining face; l is4The length of the blasting short drill hole on the stope mining line side of the stope mining face is determined;
using formulas
Figure BDA0002191158320000077
Determining the blasting short drill hole inclination angle of the stope line side of the stope face; alpha is alpha4And the blasting short drill hole inclination angle of the stope line side of the stope face is set.
The blasting long drill hole is used for cutting off a propagation path of the top plate high-position advanced bearing pressure, and the blasting short drill hole is used for cutting off a propagation path of the top plate low-position advanced bearing pressure, so that a main roadway near a mining area is free from the influence of appearing of mining pressure, the stress environment of surrounding rocks of the roadway is improved, and the deformation of the roadway is weakened.
In order to avoid the damage of deep hole presplitting blasting to surrounding rocks at the shallow part of the roadway, a blasting section and an unexploded section are determined according to the blasting drill hole; the non-blasting section is arranged in the surrounding rock of the front blasting drilling section; the blasting section is arranged in the surrounding rock of the blasting drilling rear section.
The unexploded section is one third of the length of the blast drill hole.
In a specific embodiment, an upper drill hole and a lower drill hole are in a group, and the distance between every two drill holes is 3-5 m, so that secondary cracks generated by blasting on the top plate are communicated.
In one embodiment, the mining height of a coal seam is 4m, the length of a working face is 210m, the influence range of the advance support pressure is 150m, the width of a roadway protection coal pillar is 100m, the width of a limit balancing area is 22m,
the specific technical scheme is as follows:
fig. 2 is a plan view of a hole drilled by the top plate deep surrounding rock pressure relief method based on carbon dioxide blasting, as shown in fig. 2, before a main roadway 3 in a stoping working face is not affected by a stoping pressure, an upper row of blasting long drill holes 6 and a lower row of blasting short drill holes 9 are arranged in a roadway protecting roadway coal pillar stress peak affected zone towards an overburden rock layer 7 on a working face on the inner side of the stoping working face 1. The blasting long drill hole 6 is used for cutting off the propagation path of the top plate high advanced supporting pressure, and the blasting short drill hole 9 is used for cutting off the propagation path of the top plate high advanced supporting pressure, so that a main roadway near a mining area is free from the influence of appearing of mining pressure, the stress environment of surrounding rocks of the roadway is improved, and the deformation of the roadway is weakened.
The diameter of the drill hole at the side of the main roadway 3 in the stoping working face is 65mm, and the angle alpha between the blasting long drill hole 6 at the side of the main roadway 3 in the stoping working face and the coal bed 8 is1Is 21 degrees, and the length L of the main body roadway 3 side blasting long drill hole 6 in the stoping working face183m, height h of the cut top1Is 29 m. Angle alpha between main body roadway 3 side blasting short drill hole 9 and coal seam 8 in stoping working face2Is 16 degrees, and the length L of the short blast hole 9 on the side of the main roadway 3 in the stoping working face281m, height of cut top h2Is 22 m.
The diameter of the drill hole at the side of the stoping line 2 of the stoping working face is 65mm, an upper row and a lower row of blasting long drill holes 6 and blasting short drill holes 9 are arranged on the top plate at the inner side of the stoping working face, and the angle alpha between the long drill hole at the side of the stoping line 2 of the stoping working face and the coal seam is 883Is 18 degrees, and the length L of the long drill hole at the side of the stope mining stopping line 2 of the stope mining face388m, height h of the cut top3Is 27 m; stope face stoping line 2 side short drill hole and coal seam8 Angle alpha4Is 14 degrees, and the length L of the short drill hole at the side of the stope mining line 2 of the stope mining face4Is 86m, the height h of the top cut4Is 20 m.
In order to avoid the damage of the deep hole presplitting blasting to the surrounding rock of the shallow part of the roadway, an unexploded section with a certain length is arranged in the surrounding rock of the shallow part of the drilling hole, the unexploded section is 1/3 of the length of the blasting drilling hole, the unexploded section of the main roadway 3 blasting the long drilling hole 6 in the stoping working face is 28m in length, and the unexploded section of the blasting short drilling hole 9 is 27m in length; the unexploded section length of the blasting long drill hole 6 on the stope line 2 side of the stope face is 30m, and the unexploded section length of the blasting short drill hole 9 is 29 m.
Fig. 3 is a sectional view a-a of a working surface of a pressure relief method for deep surrounding rock of a top plate based on carbon dioxide blasting according to the present invention, and fig. 4 is a sectional view B-B of the working surface of the pressure relief method for deep surrounding rock of a top plate based on carbon dioxide blasting according to the present invention, as shown in fig. 3 and 4, the installation position of a blasting borehole is clearly known.
The carbon dioxide cracking device is sequentially placed in a blasting drill hole, liquid carbon dioxide is filled in the carbon dioxide cracking device at the blasting section, the carbon dioxide cracking device at the non-blasting section is connected through an insulated wire, the carbon dioxide cracking device at the blasting section and the carbon dioxide cracking device at the non-blasting section are connected well, a DC plug is inserted in the cracking device at the tail end of the hole opening, the plug wire is thrown out of the hole, after the hole opening is sealed through a hole sealing device, after the wire and the blasting device are connected well, the upper long drill hole and the lower long drill hole are blasted simultaneously. The side of the stope face stoping line 2 is blasted and drilled to cut off high-level and low-level rocks and fill the goaf, so that the load borne by the roadway protection coal pillars is effectively reduced; and a through blasting crack zone is formed at the high position and the low position of the top plate on the side of the main roadway 3 in the stoping working face, so that the propagation of the advance stress is prevented, the stress environment of the surrounding rock of the main roadway 3 in the stoping working face is effectively improved, and the deformation of the roadway is controlled.
Parameters of blasting the long drill hole 6 of the main roadway 3 in the stoping face: height of cut top h1The height of an overlying old top layer of the coal seam 8 is 29 m; length L of drilled hole183m, wherein the difference l between the width of the roadway protection coal pillar and the width of the ultimate balance area is 78 m; inclination angle of borehole alpha1Is 21 deg..
StopingParameters of blasting the short drill hole 9 in the main body roadway 3 in the working face: height of cut top h2Is 22 m; length L of drilled hole2Is 81 m; inclination angle of borehole alpha2Is 16 deg..
Parameters of the stope face stoping line 2 for blasting the long drill hole 6: height of cut top h327M, wherein the height M of the stope face 1 is 4M; the broken expansion coefficient k of the caving rock mass in the goaf is 1.15, and the dip angle theta of the coal bed 8 is 8 degrees. Alpha is alpha3Is 18 DEG, wherein the working face inclination length L is 210m and the borehole inclination angle alpha is3Is 18 deg..
Parameters of the stope face stoping line 2 for blasting the short drill hole 9: height of cut top h4Is 20 m; the length of the drilled hole is 86 m; inclination angle of borehole alpha4Is 14 deg..
The upper and lower two drill holes are in a group, and the distance between every two drill holes is 3 m.
Fig. 5 is a schematic structural view of a top plate deep surrounding rock pressure relief system based on carbon dioxide blasting, as shown in fig. 5, the invention further provides a top plate deep surrounding rock pressure relief system based on carbon dioxide blasting, and the system includes: the method comprises a stope face parameter acquisition module 501, a blasting hole position parameter determination module 502, a blasting hole determination module 503 and a roof crack determination module 504.
The stope face parameter acquisition module 501 is used for acquiring stope face 1 parameters; the parameters of the stope face 1 comprise the height of a basic top hard layer, the width of a roadway protection coal pillar, the width of a limit balance area, the mining height of the stope face 1, the caving rock mass crushing and expansion coefficient of a goaf, the inclination angle of a coal seam 8 and the inclination length of the stope face 1.
The blasting drill hole position parameter determining module 502 is used for determining the blasting drill hole position parameter according to the stope face 1 parameter; the blasting drilling position parameters comprise blasting drilling position parameters on the main roadway side and blasting drilling position parameters on the stoping line side; the location parameters include a crest height, a borehole length, and a borehole inclination.
The blasting drill hole determining module 503 is configured to determine a blasting drill hole according to the position parameter of the blasting drill hole; the blasting drill hole is used for placing a carbon dioxide fracturing device
The top plate crack determination module 504 is configured to determine a top plate crack by blasting with the carbon dioxide cracking device at the blasting drill hole.
The module 502 for determining the location parameter of the blast hole specifically includes: the device comprises a blasting drill hole position parameter determining unit on the main roadway side and a blasting drill hole position parameter determining unit on the stoping line side.
And the blasting drill hole position parameter determining unit on the main roadway side is used for determining the blasting drill hole position parameter on the main roadway 3 side in the stoping working face according to the stoping working face 1 parameter.
And the blasting drill hole position parameter determining unit on the stope line side is used for determining the blasting drill hole position parameter on the stope line 2 side according to the stope working face 1 parameter.
In practical application, a roof deep country rock release system based on carbon dioxide blasting still includes: and determining a module for a blasting section and an unexploded section.
The blasting section and non-blasting section determining module is used for determining a blasting section and a non-blasting section according to the blasting drill hole; the non-blasting section is arranged in the surrounding rock of the front blasting drilling section; the blasting section is arranged in the surrounding rock of the blasting drilling rear section.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (4)

1. A top plate deep surrounding rock pressure relief method based on carbon dioxide blasting is characterized by comprising the following steps:
acquiring mining face parameters; the stope face parameters comprise the height of a basic top hard layer, the width of a roadway protection coal pillar, the width of a limit balance area, the mining height of a stope face, the caving rock mass crushing and swelling coefficient of a goaf, the coal seam inclination angle and the stope face inclination length;
determining blasting drill hole position parameters according to the stope face parameters; the blasting drilling position parameters comprise blasting drilling position parameters on the main roadway side and blasting drilling position parameters on the stoping line side; the blasting drilling position parameters comprise a top cutting height, a drilling length and a drilling inclination angle;
determining blasting drill holes according to the blasting drill hole position parameters; the blasting drill hole is used for placing a carbon dioxide fracturing device;
blasting at the blasting drill hole by using the carbon dioxide fracturing device to determine a top plate crack;
the determining of the blasting drill hole position parameters according to the stope face parameters specifically comprises:
determining blasting drilling hole position parameters of the main roadway side in the stoping working face according to the stoping working face parameters;
determining blasting drill hole position parameters of the stope mining line side of the stope mining face according to the stope mining face parameters;
determining blasting drilling hole position parameters of the main roadway side in the stope face according to the stope face parameters, and specifically comprising the following steps:
using formulas
Figure FDA0002946488940000011
Determining the blasting long drilling length of the main roadway side in the stoping working face; l is1For blasting long bore lengths, h, of the main roadway sides in the stope face1Blasting of the main roadway side in the stope faceThe roof cutting height of the long drill hole is the difference between the width of the roadway protection coal pillar and the width of the ultimate balance area;
using formulas
Figure FDA0002946488940000012
Determining the blasting long drilling hole inclination angle of the main roadway side in the stoping working face; alpha is alpha1The blast long drilling hole inclination angle of the main roadway side in the stoping working face is set;
using the formula h2=0.75h1Determining the crest cutting height of the blasting short drill hole on the main roadway side in the stoping working face; h is2The crest cutting height of the blasting short drill hole on the main roadway side in the stoping working face is set;
using formulas
Figure FDA0002946488940000021
Determining the blasting short drill hole length of the main roadway side in the stoping working face; l is2The length of the blasting short borehole on the main roadway side in the stoping face is obtained;
using formulas
Figure FDA0002946488940000022
Determining the blasting short drill hole inclination angle of the main roadway side in the stoping working face; alpha is alpha2The blasting short drill hole inclination angle of the main roadway side in the stoping working face is set;
the method for determining the blasting drill hole position parameters of the stope mining line side of the stope mining face according to the stope mining face parameters specifically comprises the following steps:
using formulas
Figure FDA0002946488940000023
Determining the crest cutting height of the blasting long drill hole on the stoping line side of the stoping working face; wherein h is3The top cutting height of the blasting long drill hole on the stope mining line side of the stope face is defined, and M is the mining height of the stope face; k is the broken expansion coefficient of the caving rock mass in the goaf, and theta is the inclination angle of the coal bed;
using formulas
Figure FDA0002946488940000024
Determining the blasting long drilling length of the stope mining line side of the stope mining face; l is3The length of the blasting long drill hole on the stope mining line side of the stope mining face is L, and the L is the stope mining face inclination length;
using formulas
Figure FDA0002946488940000025
Determining the blasting long drilling hole inclination angle of the stope mining line side of the stope mining face; alpha is alpha3The blasting long drilling hole inclination angle of the stope line side of the stope face is set;
using formulas
Figure FDA0002946488940000026
Determining the crest cutting height of the blasting short drill hole on the stoping line side of the stoping working face; h is4The top cutting height of the blasting short drill hole at the stoping line side of the stoping working face is set;
using formulas
Figure FDA0002946488940000027
Determining the blasting short drilling hole length of the stope mining line side of the stope mining face; l is4The length of the blasting short drill hole on the stope mining line side of the stope mining face is determined;
using formulas
Figure FDA0002946488940000028
Determining the blasting short drill hole inclination angle of the stope line side of the stope face; alpha is alpha4And the blasting short drill hole inclination angle of the stope line side of the stope face is set.
2. The method for releasing pressure of the deep surrounding rock of the top plate based on the carbon dioxide blasting as claimed in claim 1, wherein after the step of determining the blasting hole position parameters according to the stope face parameters, the method further comprises the following steps:
determining a blasting section and a non-blasting section according to the blasting drill hole; the non-blasting section is arranged in the surrounding rock of the front blasting drilling section; the blasting section is arranged in the surrounding rock of the blasting drilling rear section.
3. A top plate deep surrounding rock pressure relief system based on carbon dioxide blasting is used for realizing the top plate deep surrounding rock pressure relief method based on carbon dioxide blasting according to any one of claims 1-2; it is characterized by comprising:
the stope face parameter acquisition module is used for acquiring stope face parameters; the stope face parameters comprise the height of a basic top hard layer, the width of a roadway protection coal pillar, the width of a limit balance area, the mining height of a stope face, the caving rock mass crushing and swelling coefficient of a goaf, the coal seam inclination angle and the stope face inclination length;
the blasting drilling hole position parameter determining module is used for determining blasting drilling hole position parameters according to the stope face parameters; the blasting drilling position parameters comprise blasting drilling position parameters on the main roadway side and blasting drilling position parameters on the stoping line side; the blasting drilling position parameters comprise a top cutting height, a drilling length and a drilling inclination angle;
the blasting drill hole determining module is used for determining blasting drill holes according to the blasting drill hole position parameters; the blasting drill hole is used for placing a carbon dioxide fracturing device;
the top plate crack determining module is used for blasting by utilizing the carbon dioxide fracturing device at the blasting drill hole to determine a top plate crack;
the blasting drilling position parameter determining module specifically comprises:
the blasting drilling position parameter determining unit at the main roadway side is used for determining the blasting drilling position parameter at the main roadway side in the stope face according to the stope face parameter;
and the blasting drill hole position parameter determining unit at the stope line side is used for determining the blasting drill hole position parameter at the stope line side of the stope face according to the stope face parameter.
4. The carbon dioxide blast based roof deep wall rock pressure relief system of claim 3, further comprising:
the blasting section and non-blasting section determining module is used for determining a blasting section and a non-blasting section according to the blasting drill hole; the non-blasting section is arranged in the surrounding rock of the front blasting drilling section; the blasting section is arranged in the surrounding rock of the blasting drilling rear section.
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