CN111706390B - Method for eliminating rock burst - Google Patents
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- CN111706390B CN111706390B CN202010290089.5A CN202010290089A CN111706390B CN 111706390 B CN111706390 B CN 111706390B CN 202010290089 A CN202010290089 A CN 202010290089A CN 111706390 B CN111706390 B CN 111706390B
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- 239000011435 rock Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000035939 shock Effects 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 claims description 3
- 238000005422 blasting Methods 0.000 abstract description 10
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 239000002360 explosive Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005065 mining Methods 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- 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
- E21B7/14—Drilling by use of heat, e.g. flame drilling
- E21B7/15—Drilling by use of heat, e.g. flame drilling of electrically generated heat
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- 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
- E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
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- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- Disintegrating Or Milling (AREA)
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- Earth Drilling (AREA)
Abstract
The invention relates to a method for eliminating rock burst, which aims to solve the problems of high risk and poor environmental protection in eliminating rock burst hidden danger by a drilling and blasting method. The method for eliminating the rock burst comprises the following steps; s1, setting the positions and the number of the drill holes on the rock stratum; and drilling a borehole on the rock stratum, wherein the borehole is arranged towards the high stress area of the rock stratum on the top surface of the roadway and penetrates through the high stress area. S2, installing an orifice device in each drill hole, and then filling the drill holes with water; s3, connecting the energy converter with the pulse power driving source; then placing an energy converter in the borehole; s4, starting the pulse power driving source to discharge to the energy converter, and fracturing the rock stratum by the shock wave generated by the energy converter; the strength of the shock wave is 210-219 MPa; cracks generated by a plurality of drilled holes form a crack network in a high stress area, and then stress is unloaded in a large area, namely, the rock burst is eliminated.
Description
Technical Field
The invention belongs to the technical field of mine engineering, and particularly relates to a method for eliminating rock burst.
Background
Rock burst refers to the phenomenon of sudden damage in an adjacent empty rock mass in a deep part or a region with high structural stress of underground mining. This occurs because the strain energy adjacent to the volume accumulation of the empty rock is suddenly and violently released all together, causing brittle fracture of the rock mass like an explosion. Rock burst causes a great deal of rock to collapse and generates huge sound and wave impact, which can not only destroy mines, but also endanger ground buildings. The rock burst geological disaster has the characteristics of sudden, high-risk and difficult prediction, brings great harm to personal safety and mechanical equipment, seriously influences the construction progress, is one of the worldwide underground engineering problems, and has great challenge.
At present, rock burst is controlled by adopting an active pressure relief mode, and blasting products such as explosives and the like are adopted to ensure that the periphery of a tunnel is smooth by utilizing a smooth surface or presplitting blasting technology according to the principle of 'short footage and weak blasting', so that the intensity of the rock burst is reduced. The drilling and blasting method releases the rock stress in advance, is the most powerful measure for eliminating rock burst hidden danger, and still has the following defects: the situation of a dumb gun is more dangerous; the controllability of blasting effect on surrounding rock disturbance is poor; the explosive stored underground has great potential safety hazard and the like. The drilling and blasting method adopting the explosive has high danger and poor environmental protection, so the use of the method is more and more strictly controlled, and the mining development efficiency and the recovery efficiency are reduced.
Disclosure of Invention
The invention aims to provide a method for eliminating rock burst, which aims to solve the problems of high risk and poor environmental protection in eliminating rock burst hidden danger by a drilling and blasting method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for eliminating rock burst comprises the following steps;
s1, setting the positions and the number of the drill holes on the rock stratum; and drilling a borehole on the rock stratum, wherein the borehole is arranged towards the high stress area of the rock stratum on the top surface of the roadway and penetrates through the high stress area.
S2, installing an orifice device in each drill hole, and then filling the drill holes with water;
s3, connecting the energy converter with the pulse power driving source; then placing an energy converter in the borehole;
s4, starting the pulse power driving source to discharge to the energy converter, and fracturing the rock stratum by the shock wave generated by the energy converter; the strength of the shock wave is 210-219 MPa; cracks generated by a plurality of drilled holes form a crack network in a high stress area, and then stress is unloaded in a large area, namely, the rock burst is eliminated.
Preferably, the energy converter includes ground electrode, high voltage electrode, insulation support, shell and cable interface, the shell is cylindric structure, and its inside cavity, high voltage electrode pass through insulation support to be fixed at the shell tip, and the cable conductor of cable interface tip passes shell body, insulation support are connected with the high voltage electrode rear end, and ground electrode sets up and is connected with the shell along the length direction of shell, and ground electrode sets up with the high voltage electrode front end relatively.
Preferably, the ground electrode is connected with the high-voltage electrode through a metal wire, and one metal wire is replenished on one side of the ground electrode after the energy converter discharges.
Preferably, the pulsed power drive source electrical energy storage is greater than 100 kJ.
Preferably, the orifice device comprises an expansion sleeve clamped at the orifice of the drill hole, the lower surface of an annular fixed plate at the upper end of the expansion sleeve is contacted with the edge of the drill hole, a tubular taper sleeve is sleeved in the expansion sleeve, a taper port at the lower end of the taper sleeve is clamped in an expansion sheet circumferentially arranged at the lower end of the expansion sleeve, the expansion sheet protrudes outwards and is in close contact with the wall of the drill hole, and the expansion sheet is elastically connected with the lower end of the expansion sleeve; the taper sleeve upper end left and right sides is equipped with the connecting plate, is equipped with the screw rod on the connecting plate, after the screw rod passed the screw hole on the connecting plate with butt board swing joint, butt board lower extreme with annular fixed plate upper surface contact is equipped with the check valve in the taper sleeve, the taper sleeve upper end be equipped with the connecting portion of energy converter adaptation are equipped with the sealing washer on the connecting portion.
Preferably, one or more operation sections are arranged in the drill hole, the distance between every two adjacent operation sections is 5-10m, the energy converter sequentially carries out shock wave operation on the operation sections from the deepest part of the drill hole to the outside, and a shock wave output window of the energy converter is aligned to the middle point of the operation sections.
Preferably, step S4 further includes observing the size of the crack generated on the inner wall of the borehole in the rock formation after the fracturing by using an endoscope, filling the borehole with water if the width of the crack does not reach the set crack width, and starting the pulse power driving source to discharge again until the rock formation crack reaches the set width, wherein the set crack width is larger than 10 nm.
The invention has the beneficial effects that:
according to the method for eliminating rock burst, the rock stratum is fractured through drilling holes and low-strength shock waves for many times, the rock stratum is fractured by utilizing the fatigue effect principle, the method is safer and more environment-friendly, and the problems of high risk and poor environment friendliness of rock burst elimination by using shock waves generated by explosive explosion are solved.
When the metal wire carries out the shock wave operation after being connected ground electrode and high-voltage electrode, can improve energy converter's conversion efficiency, and then promoted the effect in fracturing rock stratum high stress area.
The method of the invention adopts the electro-hydraulic effect to generate the shock wave, and can continuously work as long as the pulse power driving source is supplemented with electric energy, thereby improving the mining efficiency of mineral resources.
The presplitting precision of a high stress area of a rock formation to be treated can be controlled by setting the positions and the number of the drill holes, namely, by setting the density of the drill holes; the pre-splitting degree of the high-stress area of the rock stratum can be controlled by setting the intensity of the shock wave and the acting times.
The method for eliminating rock burst provided by the invention is characterized in that a pulse power driving source is utilized to implement shock wave operation on a high stress area of a rock stratum through an energy converter, the pulse power driving source directly discharges water between a ground electrode and a high-voltage electrode, generated plasma electric arcs directly heat the water under subsequent strong discharge current, and surrounding water media are rapidly heated, gasified and expanded, so that the surrounding water is pushed to generate spherical waves, the spherical wave shock waves can fracture the high stress area of the rock stratum, and finally fracture zones and large-area unloading stress are formed, namely the rock burst is eliminated; the pulse power driving source can finely control the intensity of the output shock wave according to the stored energy and the output voltage, so that workers can conveniently control the intensity and the opportunity of the shock wave generated by the pulse power driving source, the controllability and the safety in the cracking process are improved, the life safety of production personnel is guaranteed, and the safety problem caused by the fact that blasting by using initiating explosive devices is not easy to control is avoided; meanwhile, the pulse power driving source can avoid the problem that toxic gases (such as nitric oxide and carbon monoxide) are generated when initiating explosive devices explode, so that the environmental protection property of eliminating rock burst is improved, and therefore, the method can be suitable for eliminating rock burst and can further improve the mining development efficiency and the recovery ratio.
Drawings
FIG. 1 is a schematic illustration of the present invention in performing an operation of eliminating a rock burst;
FIG. 2 is a schematic diagram of an energy converter;
FIG. 3 is a schematic view of the structure of an orifice device;
fig. 4 is a cross-sectional view of fig. 3.
The reference numbers are as follows:
1-ground electrode, 2-metal wire, 3-high voltage electrode, 4-insulating support, 5-shell, 6-cable interface, 7-rock stratum, 8-high stress area, 9-drilling hole, 10-roadway, 11-orifice device, 12-energy converter, 20-expansion sleeve, 21-annular fixing plate, 22-taper sleeve, 23-expansion sheet, 24-connecting plate, 25-screw rod, 26-abutting plate, 27-one-way valve and 28-sealing ring.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
a method of abating a rock burst includes an energy converter 12 and an orifice device 11.
As shown in fig. 2, the energy converter 12 includes a ground electrode 1, a wire 2, a high voltage electrode 3, an insulating support 4, a housing 5, and a cable interface 6.
The shell 5 is a cylindrical structure, the interior of the shell is hollow, the high-voltage electrode 3 is fixed at the end part of the shell 5 through the insulating support 4, a cable at the end part of the cable connector 6 penetrates through the body of the shell 5 and the insulating support 4 and then is connected with the rear end of the high-voltage electrode 3, the ground electrode 1 is arranged along the length direction of the shell 5 and is connected with the shell 5, and the ground electrode 1 is arranged opposite to the front end of the high-voltage electrode 3. As shown in fig. 2, the ground electrode 1, the high voltage electrode 3, and the connection portion between the ground electrode 1 and the housing 5 are open tubular structures, and the exposed portion between the ground electrode 1 and the high voltage electrode 3 is the shock wave output window.
The ground electrode 1 and the high-voltage electrode 3 are connected through a metal wire 2. The metal wire 2 can be selectively used, and when the metal wire 2 is used for conducting shock wave operation after the ground electrode 1 and the high-voltage electrode 3 are connected, the conversion efficiency of the energy converter 12 can be improved, and then the effect of fracturing the rock stratum 7 is improved.
As shown in fig. 3 and 4, the orifice device 11 includes an expansion sleeve 20 which is clamped at the orifice of the drill hole 9, the lower surface of an annular fixing plate 21 at the upper end of the expansion sleeve 20 is in contact with the edge of the drill hole 9, a tubular taper sleeve 22 is sleeved in the expansion sleeve 20, a taper port at the lower end of the taper sleeve 22 is clamped in an expansion sheet 23 which is circumferentially arranged at the lower end of the expansion sleeve 20, the expansion sheet 23 protrudes outwards and is in close contact with the hole wall of the drill hole 9, the orifice device 11 is further fixed with the drill hole 9, the expansion sheet 23 is elastically connected with the lower end of the expansion sleeve 20, the elastic connection facilitates the automatic recovery of the expansion sheet 23 to the original position, and the expansion sheet 23 can protrude outwards again to fix the orifice device 11.
Connecting plates 24 are arranged on the left side and the right side of the upper end of the taper sleeve 22, screw rods 25 are arranged on the connecting plates 24, the screw rods 25 penetrate through threaded holes in the connecting plates 24 and are movably connected with abutting plates 26, the lower end of the abutting plates 26 is in surface contact with the upper surface of the annular fixing plate 21, the taper sleeve 22 can be moved upwards when the screw rods 25 are rotated to move downwards, then a taper port at the lower end of the taper sleeve 22 can be clamped at the lower end of the expansion sleeve 20, therefore, the expansion sheet 23 protrudes outwards and is in close contact with the hole wall of the drilled hole 9, the taper port at the lower end of the taper sleeve 22 can be separated from the expansion sheet 23 when the taper sleeve 22 moves downwards, and then the orifice device 11 can be taken down.
Be equipped with check valve 27 in the taper sleeve 22, check valve 27 can avoid a large amount of water to flow out from drilling 9 when the water injection finishes, taper sleeve 22 upper end be equipped with the connecting portion of energy converter 12 adaptation are equipped with sealing washer 28 on the connecting portion, and when drilling 9 was put into to energy converter 12 front end, energy converter 12 rear end was connected fixedly through above-mentioned connecting portion, and sealing washer 28 can be sealed the junction and then avoid drilling 9 normal water to flow out.
The working principle of the invention is that a pulse power driving source is adopted to discharge the metal wire 2 arranged between the ground electrode 1 and the high-voltage electrode 3, and the discharge current causes the metal wire 2 to explode electrically to form a plasma arc channel (when the metal wire 2 is not adopted, the pulse power driving source directly discharges water between the ground electrode 1 and the high-voltage electrode 3, and high-voltage pulses generated after discharge can puncture a water gap to form the plasma arc channel); the generated plasma electric arc directly heats water under subsequent strong discharge current, and rapidly heats, gasifies and expands surrounding water media, so that peripheral water is pushed to generate spherical wave shock waves, and the spherical wave shock waves can fracture the high stress area 8 of the rock stratum 7. The intensity of the shock wave can be controlled according to the energy storage and output voltage of the pulse power driving source.
The method for eliminating rock burst provided by the invention is shown in figure 1 and specifically comprises the following steps;
s1, setting an operation scheme of the rock stratum 7 according to the mechanical property of the rock stratum 7 and the effective distance of the shock wave fracturing rock stratum 7; the operating scheme includes the position and number of the boreholes 9, and the intensity and number of times each borehole 9 is subjected to a shock wave. The fracturing precision of the high-stress area 8 of the rock stratum 7 can be controlled by setting the positions and the number of the drill holes 9, namely by setting the density of the drill holes 9; the cracking degree of the high stress zone 8 of the rock stratum 7 can be controlled by setting the intensity and the acting times of the shock wave.
Before the operation scheme is set, the rock stratum 7 is drilled with holes 9 for shock wave tests with different strengths, after the shock wave tests are completed, the fractured rock stratum 7 is inspected by using an endoscope or a three-dimensional seismic exploration method, so that the fracture size and range and the shock wave implementation strength and times suitable for the rock stratum 7 can be obtained.
The drill hole 9 is arranged on the top surface of the tunnel or the roadway 10 towards the high stress area 8 of the rock stratum 7, the drill hole 9 penetrates through the high stress area 8, the high stress area 8 in the rock stratum 7 can be completely fractured through the depth of the drill hole 9, and if the depth of the drill hole 9 only extends to the end part of the high stress area 8, the shock wave generated by the energy converter 12 cannot completely fracture the end part of the high stress area 8, so that the rock burst cannot be completely eliminated.
Preferably, the inner diameter of the drill hole 9 is 113-153mm, and the distance between two adjacent drill holes 9 is 10-15 m; one or more operation sections are arranged in the drill hole 9, the distance between two adjacent operation sections is preferably 5-10m, the fracturing effect of the operation sections is better, the energy converter 12 sequentially carries out shock wave operation on the operation sections from the deepest part of the drill hole 8 to the outside, and a shock wave output window of the energy converter 12 is aligned to the middle point of the operation sections.
The rock stratum 7 is fractured through the low-intensity shock waves of the drilling hole 9 for a plurality of times, preferably, the intensity of the shock waves is 210-219MPa, and the pulse width is 40 microseconds. After one working section completes the shock wave operation, the shock wave operation is sequentially performed to the other working sections of the drill hole 9 outwards. Multiple, multiple fracturing of the formation 7 is performed through the borehole 9, thereby fracturing the formation 7 as a whole.
A borehole 9 is drilled in a high stress zone 8 of the formation 7 according to the above-described operating scheme.
S2, installing an orifice device 11 at each orifice of the borehole 8, wherein the orifice device 11 is used for fixing the energy converter 12 and closing the orifice, and filling the borehole 9 with water after installing the orifice device 11.
S3, connecting the energy converter 12 to the pulse power driving source through a coaxial cable; the pulse power driving source is arranged in the sealed shell in a self-integration mode, the electric energy storage of the pulse power driving source is larger than 100kJ, pure electric energy high voltage is output through the coaxial cable, and the impulse wave is generated through discharging of the energy converter 12.
The energy converter 12 is placed in the above-mentioned borehole 9 by using a drilling machine, the shock wave output window of the energy converter 12 is directed to the midpoint of the deepest operation section of the borehole 9, and the ground electrode 1 and the high voltage electrode 3 of the energy converter 12 are brought into full contact with the water in the borehole 9 to generate a plasma arc, and the generated plasma arc reacts with the water to form a shock wave which is output from the shock wave output window.
S4, the pulse power driving source is started to charge the energy storage capacitor, after the electric energy of the energy storage capacitor reaches the working threshold of the control switch, the pulse power driving source discharges to the energy converter 12, and the rock stratum 7 is fractured by the shock wave generated by the energy converter 12;
and observing the cracks formed on the inner wall of the drill hole 9 in the rock stratum 7 after the fracturing by using an endoscope, filling water into the drill hole 9 again if the maximum width of the crack does not reach 10nm (the set crack width is more than 10nm), and starting the pulse power driving source to discharge again until the cracks on the rock stratum 7 reach the set width.
The pulse power drive source can generate a shock wave again by repeating charging and discharging; after the pulse power driving source discharges by using the metal wire 2, the metal wire 2 is scrapped after electric explosion, and when the discharge is performed again, one metal wire 2 needs to be replenished on one side of the ground electrode 1 of the energy converter 12.
The degree of fracturing rock stratum 7 is controlled through the intensity of shock wave and the number of times of impact to the distance control between drilling 9 fractures rock stratum 7 precision for a plurality of drilling 9 produce the fracture of setting for the size, and the fracture that a plurality of drilling 9 produced forms the seam net in high stress area 8, and then unloads stress by a large scale, also promptly with the rockburst elimination.
In the coal mining process, if an area with insufficient cracking degree exists in the rock stratum 7, the rock stratum 7 can be fully cracked by adding a new borehole 9, so that rock burst is eliminated.
According to the method for eliminating rock burst, the rock stratum is fractured through drilling holes and low-strength shock waves for many times, the rock stratum is fractured by utilizing the fatigue effect principle, the method is safer and more environment-friendly, and the problems of high risk and poor environment friendliness of rock burst elimination by using shock waves generated by explosive explosion are solved.
When the metal wire carries out the shock wave operation after being connected ground electrode and high-voltage electrode, can improve energy converter's conversion efficiency, and then promoted the effect in fracturing rock stratum high stress area.
The method for eliminating rock burst provided by the invention adopts the electro-hydraulic effect to generate shock waves, and can continuously work only by supplementing electric energy to the pulse power driving source, thereby improving the mining efficiency of mineral resources.
The presplitting precision of a high stress area of a rock formation to be treated can be controlled by setting the positions and the number of the drill holes, namely, by setting the density of the drill holes; the pre-splitting degree of the high-stress area of the rock stratum can be controlled by setting the intensity of the shock wave and the acting times.
The method for eliminating rock burst provided by the invention is characterized in that a pulse power driving source is utilized to implement shock wave operation on a high stress area of a rock stratum through an energy converter, the pulse power driving source directly discharges water between a ground electrode and a high-voltage electrode, generated plasma electric arcs directly heat the water under subsequent strong discharge current, and surrounding water media are rapidly heated, gasified and expanded, so that the surrounding water is pushed to generate spherical waves, the spherical wave shock waves can fracture the high stress area of the rock stratum, and finally fracture zones and large-area unloading stress are formed, namely the rock burst is eliminated; the pulse power driving source can finely control the intensity of the output shock wave according to the stored energy and the output voltage, so that workers can conveniently control the intensity and the opportunity of the shock wave generated by the pulse power driving source, the controllability and the safety in the cracking process are improved, the life safety of production personnel is guaranteed, and the safety problem caused by the fact that blasting by using initiating explosive devices is not easy to control is avoided; meanwhile, the pulse power driving source can avoid the problem that toxic gases (such as nitric oxide and carbon monoxide) are generated when initiating explosive devices explode, so that the environmental protection property of eliminating rock burst is improved, and therefore, the method can be suitable for eliminating rock burst and can further improve the mining development efficiency and the recovery ratio.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A method for eliminating rock burst is characterized in that: comprises the following steps;
s1, setting the positions and the number of the drill holes (9) on the rock stratum (7); drilling a borehole (9) on the rock stratum (7), wherein the borehole (9) is arranged on the top surface of the roadway (10) towards the high stress area (8) of the rock stratum (7), and the borehole (9) penetrates through the high stress area (8);
s2, installing an orifice device (11) in each drill hole (9), and then filling the drill holes (9) with water;
s3, connecting the energy converter (12) with the pulse power driving source; then placing an energy converter (12) in the borehole (9);
s4, starting the pulse power driving source to discharge to the energy converter (12), and fracturing the rock stratum (7) by the shock wave generated by the energy converter (12); the strength of the shock wave is 210-219 MPa; cracks generated by the plurality of drill holes (9) form a crack network in the high stress area (8), so that the stress is unloaded in a large area, namely, the rock burst is eliminated; the energy converter (12) comprises a ground electrode (1), a high-voltage electrode (3), an insulating support (4), a shell (5) and a cable interface (6), wherein the shell (5) is of a cylindrical structure and is hollow inside, the high-voltage electrode (3) is fixed at the end part of the shell (5) through the insulating support (4), a cable at the end part of the cable interface (6) penetrates through the body of the shell (5), the insulating support (4) is connected with the rear end of the high-voltage electrode (3), the ground electrode (1) is arranged along the length direction of the shell (5) and is connected with the shell (5), and the ground electrode (1) is arranged opposite to the front end of the high-voltage electrode (3);
the orifice device (11) comprises an expansion sleeve (20) clamped at the orifice of the drill hole (9), the lower surface of an annular fixing plate (21) at the upper end of the expansion sleeve (20) is in contact with the edge of the drill hole (9), a tubular taper sleeve (22) is sleeved in the expansion sleeve (20), a taper port at the lower end of the taper sleeve (22) is clamped in an expansion sheet (23) circumferentially arranged at the lower end of the expansion sleeve (20), the expansion sheet (23) protrudes outwards and is in tight contact with the hole wall of the drill hole (9), and the expansion sheet (23) is in elastic connection with the lower end of the expansion sleeve (20); taper sleeve (22) upper end left and right sides is equipped with connecting plate (24), is equipped with screw rod (25) on connecting plate (24), screw rod (25) pass behind the screw hole on connecting plate (24) with butt plate (26) swing joint, butt plate (26) lower extreme with surface contact on annular fixed plate (21), be equipped with check valve (27) in taper sleeve (22), taper sleeve (22) upper end be equipped with the connecting portion of energy converter (12) adaptation are equipped with sealing washer (28) on the connecting portion.
2. A method of eliminating rock bursts as claimed in claim 1, wherein: the pulse power driving source has an electric energy storage larger than 100 kJ.
3. A method of eliminating rock bursts as claimed in claim 1, wherein: one or more operation sections are arranged in the drill hole (9), the distance between every two adjacent operation sections is 5-10m, the energy converter (12) sequentially carries out shock wave operation on the operation sections from the deepest part of the drill hole (9) to the outside, and a shock wave output window of the energy converter (12) is aligned to the middle point of the operation sections.
4. A method of eliminating rock bursts as claimed in claim 1, wherein: and step S4, observing the size of the crack generated on the inner wall of the drill hole (9) in the rock stratum (7) after the fracturing by using an endoscope, filling water into the drill hole (9) if the width of the crack does not reach the set crack width, and starting the pulse power driving source to discharge again until the crack of the rock stratum (7) reaches the set width, wherein the set crack width is more than 10 nm.
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| CN202010290089.5A CN111706390B (en) | 2020-04-14 | 2020-04-14 | Method for eliminating rock burst |
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| CN202010290089.5A CN111706390B (en) | 2020-04-14 | 2020-04-14 | Method for eliminating rock burst |
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| CN111706390B true CN111706390B (en) | 2022-03-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206190285U (en) * | 2016-11-24 | 2017-05-24 | 曾庆平 | Hole packer for carbon dioxide blast tube |
| CN108253849A (en) * | 2018-03-16 | 2018-07-06 | 中国矿业大学 | Coal petrography explosion pre-splitting method and device based on liquid explosives envelope note detonation in deep hole |
| CN108266226A (en) * | 2018-01-23 | 2018-07-10 | 山东理工大学 | A kind of rock burst solution danger method based on hydraulic machinery splitting |
| CN109538209A (en) * | 2018-09-11 | 2019-03-29 | 中国矿业大学 | A kind of reduction coal seam tight roof method based on electroporation |
| CN110195581A (en) * | 2019-05-31 | 2019-09-03 | 西安交通大学 | Energy converter and surge generator |
-
2020
- 2020-04-14 CN CN202010290089.5A patent/CN111706390B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206190285U (en) * | 2016-11-24 | 2017-05-24 | 曾庆平 | Hole packer for carbon dioxide blast tube |
| CN108266226A (en) * | 2018-01-23 | 2018-07-10 | 山东理工大学 | A kind of rock burst solution danger method based on hydraulic machinery splitting |
| CN108253849A (en) * | 2018-03-16 | 2018-07-06 | 中国矿业大学 | Coal petrography explosion pre-splitting method and device based on liquid explosives envelope note detonation in deep hole |
| CN109538209A (en) * | 2018-09-11 | 2019-03-29 | 中国矿业大学 | A kind of reduction coal seam tight roof method based on electroporation |
| CN110195581A (en) * | 2019-05-31 | 2019-09-03 | 西安交通大学 | Energy converter and surge generator |
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