CN111472780B - Rock pre-splitting method for mine rock roadway driving working face - Google Patents
Rock pre-splitting method for mine rock roadway driving working face Download PDFInfo
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- CN111472780B CN111472780B CN202010290544.1A CN202010290544A CN111472780B CN 111472780 B CN111472780 B CN 111472780B CN 202010290544 A CN202010290544 A CN 202010290544A CN 111472780 B CN111472780 B CN 111472780B
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- 239000011435 rock Substances 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000035939 shock Effects 0.000 claims abstract description 99
- 238000005553 drilling Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000005336 cracking Methods 0.000 claims abstract description 10
- 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
- 239000002360 explosive Substances 0.000 abstract description 13
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 description 17
- 239000002184 metal Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 8
- 238000004880 explosion Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 230000005641 tunneling Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/14—Other 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/18—Other methods or devices for dislodging with or without loading by electricity
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Abstract
The invention relates to a rock pre-splitting method for a mine rock roadway driving working face, and aims to solve the problems of high risk and poor environmental protection in the process of pre-splitting rock by using explosive at present. The rock pre-splitting method for the mine rock roadway driving working face comprises the following steps; s1, setting the drilling positions and the number of the rocks in the rock roadway, and drilling holes on the rocks, wherein the drilling holes are arranged along the two sides and the top of the rocks in the roadway, and the axes of the drilling holes are parallel to the extending direction of the rock roadway; 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; placing an energy converter in the borehole; s4, starting the pulse power driving source to discharge to the energy converter, and fracturing the rock by the shock wave generated by the energy converter; the intensity of the shock wave is 280-299 MPa; and (4) forming a crack zone by the cracks generated after the plurality of drill holes are subjected to shock wave operation, namely completing the pre-cracking of the rock in the rock roadway.
Description
Technical Field
The invention belongs to the technical field of mine engineering, and particularly relates to a rock pre-splitting method for a mine rock roadway driving working face.
Background
Mineral resources are the material basis for industrialization. The primary consumption energy of China mainly depends on coal supply, and the long-term occupation ratio reaches more than 60 percent, so that the method is a main support for industrial development of China. In the coal production of China, about 1 ten thousand-2 kilometer roadways are tunneled underground every year, wherein 9 kilometers are coal roadways, and 3 kilometers are rock roadways (rock roadways). At present, the rock tunnel is mainly tunneled by adopting an explosive blasting mode, but the mode has large engineering quantity, so that the tunneling speed is low, the cost is high, and certain potential safety hazards exist. Explosives and other initiating explosive devices have great technical advantages in rock roadway tunneling, but shock waves generated by the explosives are poor in controllability and have the problems of high risk and poor environmental protection, so that the use of the explosives and other initiating explosive devices is more and more strictly controlled, and the mining efficiency of mineral resources is reduced.
Disclosure of Invention
The invention aims to provide a method for pre-splitting rock on a mine rock roadway driving working face, which aims to solve the problems of high risk and poor environmental protection in the prior art that the rock is pre-split by using explosive.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for pre-splitting rock on a mine rock roadway driving working face comprises the following steps;
s1, setting the drilling positions and the number of the rocks in the rock roadway, and drilling holes on the rocks, wherein the drilling holes are arranged along the two sides and the top of the rocks in the roadway, and the axes of the drilling holes are parallel to the extending direction of the rock roadway;
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; placing an energy converter in the borehole;
s4, starting the pulse power driving source to discharge to the energy converter, and fracturing the rock by the shock wave generated by the energy converter; the intensity of the shock wave is 280-299 MPa; and (4) forming a crack zone by the cracks generated after the plurality of drill holes are subjected to shock wave operation, namely completing the pre-cracking of the rock in the rock roadway.
Preferably, step S4 further includes observing the size of the crack generated on the inner wall of the drill hole in the rock after the secondary fracturing by using an endoscope, filling the drill hole 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 crack reaches the set width, wherein the set crack width is larger than 10 nm.
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, the energy converter comprises a ground electrode, a high-voltage electrode, an insulating support, a shell and a cable interface, the shell is of a cylindrical structure, the interior of the shell is hollow, the high-voltage electrode is fixed at the front end of the shell through the insulating support, a cable at the end part of the cable interface penetrates through the rear end of the shell and the insulating support to be connected with the rear end of the high-voltage electrode, the ground electrode is connected with the front end of the shell through two shock wave directional reflection arc plates, the ground electrode and the front end of the high-voltage electrode are oppositely arranged, the two shock wave directional reflection arc plates are symmetrically arranged at the front end of the shell, and one opposite sides of the two shock wave directional reflection arc plates are both arc surfaces; the opening enclosed by the two shock wave directional reflection arc plates, the ground electrode and the shell is a shock wave output window.
Preferably, the direction in which the energy converter applies shock waves to the same working section of the plurality of boreholes lies in the same plane.
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 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, the pulsed power drive source electrical energy storage is greater than 100 kJ.
The invention has the beneficial effects that:
1. according to the method for pre-cracking the rock on the working face of the mine rock roadway, provided by the invention, the rock is pre-cracked through a plurality of times of low-strength shock waves by drilling, the rock is cracked by utilizing the fatigue effect principle, the method is safer and more environment-friendly, and the problems of high risk and poor environmental protection of rock pre-cracking caused by the shock waves generated by explosive explosion are solved.
2. 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 that sends and splits the rock.
3. 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.
4. The directional output of the shock wave can fully crack the rock in the region of the drilling connecting line, so that a fractured zone is formed, the rock in the fractured zone can be easily tunneled, and meanwhile, the problem that the rock in the rest region is cracked due to the fact that the shock wave is not directionally output is avoided.
5. The cracking precision of the rock 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 rock can be controlled by setting the intensity of the shock wave and the acting times.
6. The method for pre-splitting the rock on the working face of the mine rock roadway improves the environmental protection and safety of coal resource exploitation.
Drawings
FIG. 1 is a schematic illustration of rock pre-splitting at a mine face for rock roadway driving according to the present invention;
FIG. 2 is a view A-A of FIG. 1;
FIG. 3 is a schematic diagram of an energy converter;
FIG. 4 is a cross-sectional view of the shock wave directional reflecting arc plate of FIG. 3;
FIG. 5 is a schematic view of the structure of an orifice device;
fig. 6 is a cross-sectional view of fig. 5.
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 lane, 8-rock, 9-drilling, 10-orifice device, 11-energy converter, 13-shock wave directional reflection arc plate, 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 rock pre-splitting method for a mine rock roadway driving working face comprises an energy converter 11 and an orifice device 12.
As shown in fig. 3 and 4, the energy converter 11 includes a ground electrode 1, a metal wire 2, a high-voltage electrode 3, an insulating support 4, a housing 5, a cable interface 6, and a shock wave directional reflection arc plate 13.
The shell 5 is of 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 connected with the front end of the shell 5 through two shock wave directional reflection arc plates 13, the ground electrode 1 and the front end of the high-voltage electrode 3 are oppositely arranged, the two shock wave directional reflection arc plates 13 are symmetrically arranged at the front end of the shell 5, and one opposite sides of the two shock wave directional reflection arc plates 13 are arc surfaces; an opening formed by the two shock wave directional reflection arc plates 13, the ground electrode 1 and the shell 5 in a surrounding mode is a 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 carrying out shock wave operation after the ground electrode 1 and the high-voltage electrode 3 are connected, the conversion efficiency of the energy converter 11 can be improved, and then the effect of fracturing the rock 8 is improved.
As shown in fig. 5 and 6, the orifice device 12 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 12 is 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 12.
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 12 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 13 adaptation are equipped with sealing washer 28 on the connecting portion, and when drilling 9 was put into to energy converter 13 front end, energy converter 13 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 arc directly heats water under subsequent strong discharge current, rapidly heats, gasifies and expands surrounding water media, further pushes peripheral water to generate spherical wave shock waves, and the spherical wave shock waves can crack the rock 8. The intensity of the shock wave can be controlled according to the energy storage and output voltage of the pulse power driving source.
A part of shock waves generated by the electric explosion of the metal wire 2 on the energy converter 11 are directly output from the shock wave output window, and the rest shock waves are reflected by the arc surface on the shock wave directional reflection arc plate 13 and then output from the shock wave output window; the arc surface on the shock wave directional reflection arc plate 13 adopts different radians to output shock waves from the shock wave output window in different directions; and further realizing the directional output of the shock wave, wherein the directional output of the shock wave can fully crack the rock 8 in the connecting line area of the drill hole 9, so that a fractured zone is formed. The fractured zone enables the rock in this region to be easily driven in while avoiding the problem of the shock wave not being directed out resulting in the rock 8 in the remaining region being fractured.
The invention relates to a rock pre-splitting method for a mine rock roadway driving working face, which is shown in a figure 1 and a figure 2 and specifically comprises the following steps;
s1, setting an operation scheme of the rock 8 in the rock lane 7 according to the mechanical property of the rock 8 in the rock lane 7 and the effective distance of the rock 8 caused to crack by the shock wave; the operation scheme comprises the positions and the number of the drill holes 9, the intensity and the times of the shock wave implemented by each drill hole 9, preferably the diameter of each drill hole 9 is 113 mm and 153mm, and the distance between two adjacent drill holes 9 is 5-10 m; the fracturing precision of the rock 8 can be controlled by setting the position and the number of the drill holes 9, namely by setting the density of the drill holes 9; the cracking degree of the rock 8 can be controlled by setting the shock wave intensity and the number of actions.
Before the operation scheme is set, the drill holes 9 in the rock 8 are subjected to shock wave tests with different strengths, after the shock wave tests are completed, the pre-fractured rock 8 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 8 can be obtained.
The boreholes 9 are arranged along the sides and top of the rock 8 in the roadway, the axes of the boreholes 9 being parallel to the direction of extension of the rock roadway 7. Thereby, after the rock 8 is fractured, a fracture zone which is connected by the drill hole 9 is formed along the outer edge of the rock roadway 7, and the pre-fracture of the rock 8 is completed.
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 11 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 11 is aligned to the middle point of the operation sections.
When the energy converter 11 is placed in the drill hole 9, the connecting line of the centers of the shock wave output windows of the two sides of the energy converter and the connecting line of the centers of the shock wave output windows of the operation sections of the adjacent holes are positioned on the same plane. That is, when two adjacent drill holes 9 perform the shock wave operation, the shock wave output windows of the energy converter 11 are located on the same plane, so that the rock 8 in the connecting line area of the drill holes 9 can be sufficiently fractured by utilizing the directional output of the shock wave.
The rock 8 is pre-fractured by drilling 9 through a number of low intensity shock waves, preferably with a shock wave intensity of 280-299MPa and a pulse width of 40 microseconds. After one working section has completed the shock wave operation, the other working sections of the rock 8 are successively subjected to the shock wave operation outwardly. The rock 8 is pre-split multiple times and multiple points by drilling 9, the rock 8 being pre-split as a whole.
The drilling 9 is made in the rock 8 according to the above-described working scheme.
S2, installing an orifice device 12 at each orifice of the borehole 9, the orifice device 12 being used to fix the energy converter 11 and to close the orifice, and filling the borehole 9 with water after installing the orifice device 12.
And S3, connecting the energy converter 11 with a pulse power driving source through a coaxial cable, wherein the pulse power driving source is arranged in a sealed shell in a self-integration manner, the electric energy storage of the pulse power driving source is more than 100kJ, and pure electric energy high voltage is output through the coaxial cable and is discharged through the energy converter 11 to generate shock waves.
The energy converter 11 is placed at the deepest operating point of the drill hole 9 by using a drilling machine, the shock wave output window of the energy converter 11 faces to the middle point of the deepest operating section, the ground electrode 1 and the high-voltage electrode 3 of the energy converter 11 are completely contacted with water in the drill hole 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, starting the pulse power driving source to charge the energy storage capacitor, discharging the pulse power driving source to the energy converter 11 after the electric energy of the energy storage capacitor reaches the working threshold of the control switch, and fracturing the rock 8 by the shock wave generated by the energy converter 11;
and observing the cracks formed on the inner wall of the drill hole 9 in the rock 8 after the secondary 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 8 reach the set width.
In the implementation, the rock 8 pre-cracked cracks are all more than 10nm in width through the low-intensity shock wave operation of the drill hole 9 for about 10 times.
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 11.
The degree of the pre-fractured rock 8 is controlled through the intensity of the shock wave and the number of times of the shock wave, the precision of the pre-fractured rock 8 is controlled through the distance between the drill holes 9, and cracks generated after the shock wave operation is carried out on a plurality of drill holes 9 form crack zones, namely, the pre-fracturing of the rock 8 in the rock roadway 7 is completed.
In the process of tunneling the rock roadway, if a region with insufficient pre-splitting degree exists in the rock 8, the rock 8 in the region can be fully fractured by adding a new drill hole 9, so that the smooth tunneling of the rock roadway is ensured.
According to the method for pre-cracking the rock on the working face of the mine rock roadway, provided by the invention, the rock is pre-cracked through a plurality of times of low-strength shock waves by drilling, the rock is cracked by utilizing the fatigue effect principle, the method is safer and more environment-friendly, and the problems of high risk and poor environmental protection of rock pre-cracking caused by the 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 that sends and splits the rock.
The method for pre-splitting the rock on the working face of the mine rock roadway driving provided by 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, so that the mining efficiency of mineral resources is improved.
One part of shock waves generated by the electric explosion of the metal wire on the energy converter are directly output from the shock wave output window, and the rest part of shock waves are reflected by the arc surface on the shock wave directional reflection arc plate and then are directionally output from the shock wave output window; the directional output of the shock wave can fully crack the rock in the region of the drilling connecting line, so that a fractured zone is formed, the rock in the fractured zone can be easily tunneled, and meanwhile, the problem that the rock in the rest region is cracked due to the fact that the shock wave is not directionally output is avoided.
The cracking precision of the rock 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 rock can be controlled by setting the intensity of the shock wave and the acting times.
The invention provides a rock pre-splitting method for a mine rock roadway driving working face, which is characterized in that a pulse power driving source is utilized to implement shock wave operation on rocks through an energy converter, the pulse power driving source directly discharges water between a ground electrode and a high-voltage electrode, a generated plasma electric arc directly heats the water under subsequent strong discharge current, and rapidly heats, gasifies and expands surrounding water media, so that water on the periphery is pushed to generate spherical waves, and the spherical wave shock waves can crack the rocks to finally form crack zones; 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 safety in the fracturing process is improved, the life safety of production personnel is guaranteed, and the safety problem caused by the fact that blasting by using initiating explosive is not easy to control and the problem of mine pressure impact caused by explosive are avoided; meanwhile, the pulse power driving source can avoid the problem that toxic gas (such as nitric oxide and carbon monoxide) is generated when the initiating explosive device is exploded, so that the environmental protection property of mineral resource exploitation is improved.
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 (5)
1. A rock pre-splitting method for a mine rock roadway driving working face is characterized by comprising the following steps: comprises the following steps;
s1, setting the positions and the number of the drill holes (9) of the rock (8) in the rock lane (7), drilling the drill holes (9) on the rock (8), wherein the drill holes (9) are arranged along the two sides and the top of the rock (8) in the lane, and the axis of each drill hole (9) is parallel to the extending direction of the rock lane (7);
s2, installing an orifice device (10) in each drill hole (9), and then filling the drill holes (9) with water;
s3, connecting the energy converter (11) with the pulse power driving source; placing an energy converter (11) in the borehole (9);
s4, starting the pulse power driving source to discharge to the energy converter (11), and fracturing the rock (8) by the shock wave generated by the energy converter (11); the intensity of the shock wave is 280-299 MPa; cracks generated after the plurality of drill holes (9) are subjected to shock wave operation form crack zones, namely, the pre-cracking of rocks (8) in the rock roadway (7) is completed; the energy converter (11) comprises a ground electrode (1), a high-voltage electrode (3), an insulating support (4), a shell (5), a shock wave directional reflection arc plate (13) and a cable interface (6), wherein the shell (5) is of a cylindrical structure, the interior of the high-voltage electrode is hollow, the high-voltage electrode (3) is fixed at the front end of the shell (5) through the insulating support (4), a cable at the end part of the cable interface (6) penetrates through the rear end of the shell (5) and the insulating support (4) to be connected with the rear end of the high-voltage electrode (3), the ground electrode (1) is connected with the front end of the shell (5) through two shock wave directional reflection arc plates (13), the ground electrode (1) and the front end of the high-voltage electrode (3) are arranged oppositely, the two shock wave directional reflection arc plates (13) are symmetrically arranged at the front end of the shell (5), and the opposite sides of the two shock wave directional reflection arc plates (13) are both arc surfaces; an opening formed by enclosing the two shock wave directional reflection arc plates (13), the ground electrode (1) and the shell (5) is a shock wave output window;
the orifice device (12) 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 (13) adaptation are equipped with sealing washer (28) on the connecting portion.
2. The method for pre-splitting rock on the mine rock roadway driving face according to claim 1, wherein the method comprises the following steps: and step S4, observing the size of the crack generated on the inner wall of the drill hole (9) in the rock (8) after the secondary 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 (8) reaches the set width, wherein the set crack width is more than 10 nm.
3. The method for pre-splitting rock on the mine rock roadway driving face according to claim 2, wherein the method comprises the following steps: 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 (11) 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 (11) is aligned to the middle point of the operation sections.
4. The method for pre-splitting rock on the mine rock roadway driving face according to claim 1, wherein the method comprises the following steps: the direction in which the energy converter (11) applies shock waves to the same working section of the plurality of boreholes (9) is located on the same plane.
5. The method for pre-splitting rock on the mine rock roadway driving face according to claim 1, wherein the method comprises the following steps: the pulse power driving source has an electric energy storage larger than 100 kJ.
Priority Applications (1)
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| CN112993871B (en) * | 2021-02-09 | 2022-07-12 | 浙江省海洋开发研究院 | Seabed fluting rotary-cut and water spray aggregate unit |
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| CN104594901A (en) * | 2014-12-08 | 2015-05-06 | 太原理工大学 | Method for enabling working face to pass through igneous rock intrusion area |
| CN206190285U (en) * | 2016-11-24 | 2017-05-24 | 曾庆平 | Hole packer for carbon dioxide blast tube |
| CN110195581A (en) * | 2019-05-31 | 2019-09-03 | 西安交通大学 | Energy converter and surge generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104594901A (en) * | 2014-12-08 | 2015-05-06 | 太原理工大学 | Method for enabling working face to pass through igneous rock intrusion area |
| CN206190285U (en) * | 2016-11-24 | 2017-05-24 | 曾庆平 | Hole packer for carbon dioxide blast tube |
| CN110195581A (en) * | 2019-05-31 | 2019-09-03 | 西安交通大学 | Energy converter and surge generator |
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