CN103234890B - Low-permeability coal high-pressure gas cycle pulse fracturing anti-reflection experimental device - Google Patents
Low-permeability coal high-pressure gas cycle pulse fracturing anti-reflection experimental device Download PDFInfo
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- CN103234890B CN103234890B CN201310141819.5A CN201310141819A CN103234890B CN 103234890 B CN103234890 B CN 103234890B CN 201310141819 A CN201310141819 A CN 201310141819A CN 103234890 B CN103234890 B CN 103234890B
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Abstract
The invention relates to a low-permeability coal high-pressure gas cycle pulse fracturing anti-reflection experimental device belonging to the field of low-permeability coal seam reinforcement anti-reflection technology. The coal can be impacted by high-pressure gas for a plurality of times in a circulating way through a power electric induction electronic control valve so as to be fractured for increasing permeability; and the device is simple to operate, low in cost and obvious in anti-reflection effect. The low-permeability coal high-pressure gas cycle pulse fracturing anti-reflection experimental device comprises a coal sample, a blasting cylinder mechanism, a triaxial loading system, a high pressure gas impact system and a coal permeability measurement system, wherein the coal sample consists of coal briquettes and a protecting layer; the blasting cylinder mechanism consists of an upper cylinder cover, a lower cylinder cover, a cylinder barrel, an upper pressure head and a lower pressure head; the triaxial loading system consists of an axial compression loading system and a confining pressure loading system; the high pressure gas impact system consists of a gas explosion gun, the power electric induction electronic control valve, a high-pressure gas storage tank, a multi-ported valve, an air compressor and a gas source cylinder; and the coal permeability measurement system comprises a methane gas cylinder, a water tank and a measuring cylinder arranged outside the blasting cylinder mechanism.
Description
Technical field
The invention belongs to this coal seam of hyposmosis and strengthen anti-reflection technical field, particularly relate to a kind of hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device.
Background technology
This coal seam of China's hyposmosis is strengthened anti-reflection technology and is mainly comprised wellhole blasting, waterfrac treatment etc.But wellhole blasting has the shortcoming producing spark and can not repeat powder charge, and waterfrac treatment Crack Extension has terrestrial stress susceptibility and coal seam susceptibility, and the antireflective effect making this coal seam above-mentioned strengthen anti-reflection technology is undesirable, and the technics comparing of above-mentioned technology is complicated.
Summary of the invention
For prior art Problems existing, the invention provides a kind of hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device, this device makes gases at high pressure by power electro-induction electrically-controlled valve, and repeatedly circulation impact coal body fracturing is anti-reflection, simple to operate, cost is low, antireflective effect is obvious.
To achieve these goals, the present invention adopts following technical scheme: a kind of hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device, comprises coal body sample, explosion cylinder mechanism, three axle loading systems, gases at high pressure impact system and coal body permeability determination system;
Described coal body sample is made up of coal cinder and protective seam, and described protective seam is arranged on the sidewall of coal cinder surrounding;
Described explosion cylinder mechanism is made up of upper and lower cylinder head, cylinder barrel and upper and lower pressure head, cylinder barrel is vertically arranged, the bottom of cylinder barrel is provided with lower cylinder lid, the top of cylinder barrel is provided with upper cylinder lid, described upper and lower cylinder head and cylinder barrel form seal cavity; Be provided with axial compression at the middle part of upper cylinder lid and load through hole, the bottom center place of upper cylinder lid is provided with upper cover groove, and the top of described seaming chuck is arranged in upper cover groove, and the middle part on seaming chuck vertical direction is provided with seaming chuck through hole; The center of top place of lower cylinder lid is provided with lower cover groove, and the bottom of described push-down head is provided with projection, and the projection of push-down head is arranged in lower cover groove; Middle part on push-down head and lower cylinder lid vertical direction is respectively arranged with push-down head through hole and lower cylinder lid through hole, and push-down head through hole is connected with lower cylinder lid through hole; Between described upper and lower pressure head, be provided with coal body sample, the coal cinder of coal body sample is provided with vertical blast hole, described blast hole is connected with seaming chuck through hole;
Described three axle loading systems are made up of axial compression loading system and confined pressure loading system, described axial compression loading system is arranged on the top of seaming chuck, and the top of described axial compression loading system loads by the axial compression of upper cylinder lid in explosion cylinder mechanism the outside that through hole is arranged on explosion cylinder mechanism; In axial compression loading system, be provided with three through holes, three through holes are made up of first, second, third through hole, and described first, second, third through hole is connected, and the first through hole is wherein connected with the seaming chuck through hole of seaming chuck in explosion cylinder mechanism; Described confined pressure loading system is arranged on the outside of explosion cylinder mechanism, confined pressure loading system is connected with explosion cylinder mechanism inner space by confined pressure connecting pipe, confined pressure connecting pipe is provided with the 3rd hand control valve, between the 3rd hand control valve and confined pressure loading system, on the confined pressure connecting pipe of confined pressure loading system, is provided with the 3rd digital pressure gauge;
Described gases at high pressure impact system is by being arranged on the gas explosion rifle of explosion cylinder mechanism inside and being arranged on the power electro-induction electrically-controlled valve of explosion cylinder mechanism outside, high pressure tank, multiport valve, air compressor machine and gas source bottle and forming; The rifle head of described gas explosion rifle is arranged in the blast hole of coal body sample, is filled with sealing of hole cementing agent seals in the porch of blast hole, between gas explosion rifle and blast hole; Gas explosion gun breech portion is connected with the one end of the gas piping be arranged in seaming chuck through hole, the other end of described gas piping is arranged in the first through hole of three through holes by seaming chuck through hole, second through hole of three through holes is connected by gas piping with one end of power electro-induction electrically-controlled valve, the other end of described power electro-induction electrically-controlled valve is connected by gas piping with one end of high pressure tank, and the other end of described high pressure tank is connected by gas piping with multiport valve port; Another two ports of described multiport valve are connected by gas piping with air compressor machine, gas source bottle respectively; The 5th digital pressure gauge is provided with between power electro-induction electrically-controlled valve and high pressure tank, on the gas piping of high pressure tank, gas piping between multiport valve and gas source bottle is provided with the 4th hand control valve, between the 4th hand control valve and gas source bottle, on the gas piping of gas source bottle, is provided with the 4th digital pressure gauge;
Described coal body permeability determination system forms by being arranged on the methane gas cylinder of explosion cylinder mechanism outside, tank and graduated cylinder; Be connected by methane gas piping between described methane gas cylinder with the third through-hole of three through holes in axial compression loading system, methane gas piping is provided with the first hand control valve, between the first hand control valve and methane gas cylinder, on the methane gas piping of methane gas cylinder, is provided with the first digital pressure gauge; Be inverted in described tank and be provided with graduated cylinder, one end of methane wireway is connected with lower cylinder lid through hole, and the other end is arranged in graduated cylinder; Methane wireway is provided with the second hand control valve, between the second hand control valve and lower cylinder lid through hole, on the methane wireway of lower cylinder lid through hole, is provided with the second digital pressure gauge.
The bottom margin of described upper cylinder lid is provided with upper groove, the top of described lower cylinder lid is provided with low groove, and upper and lower groove location is corresponding; The top of described cylinder barrel and bottom are separately positioned in upper and lower groove.
Cover at described lower cylinder and be provided with cylinder hydraulic hand-hole, described confined pressure connecting pipe is connected with explosion cylinder mechanism inner space by cylinder hydraulic hand-hole.
The lower surface of described seaming chuck and the upper surface of push-down head are provided with groove, and the two ends of described coal body sample are separately positioned in groove.
Over-pressure safety device is had in described high pressure tank outer setting.
The hole depth of described blast hole is 2/3 of coal body specimen height.
The seal length of the sealing of hole cementing agent between described gas explosion rifle and blast hole is 1/3 of blast hole hole depth.
Described gas explosion rifle rifle head is arranged on 1/2 ~ 2/3 position of blast hole hole depth.
Beneficial effect of the present invention:
The invention provides a kind of hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device, this device makes gases at high pressure by power electro-induction electrically-controlled valve, and repeatedly circulation impact coal body fracturing is anti-reflection, simple to operate, cost is low, antireflective effect is obvious.
Accompanying drawing explanation
Fig. 1 is the structural representation of hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device of the present invention;
Wherein, 1--coal cinder, 2--protective seam, 3--blast hole, 4--gas explosion rifle, 5--sealing of hole cementing agent, 6--cylinder barrel, 7--upper cylinder lid, 8--lower cylinder lid, 9--seaming chuck, 10--push-down head, 11--upper cylinder cap bolt, 12--lower cylinder cap bolt, 13--push-down head bolt, 14--axial compression loading system, 15--O-ring seal, 16--tri-through hole, 17--push-down head through hole, 18--cylinder hydraulic hand-hole, 19-the first hand control valve, 20-the second hand control valve, 21-the three hand control valve, 22-the four hand control valve, 23--power electro-induction electrically-controlled valve, 24-the first digital pressure gauge, 25-the second digital pressure gauge, 26-the three digital pressure gauge, 27-the four digital pressure gauge, 28-the five digital pressure gauge, 29--methane gas cylinder, 30--methane gas piping, 31--methane wireway, 32--tank, 33--graduated cylinder, 34--confined pressure loading system, 35--gas source bottle, 36--air compressor machine, 37--multiport valve, 38--gas piping, 39--high pressure tank, 40--over-pressure safety device, 41-seaming chuck through hole, 42--lower cylinder lid through hole, 43--axial compression loads through hole, 44--upper cover groove, 45--lower cover groove, 46--upper groove, 47-low groove, 48--is protruding, 49-confined pressure connecting pipe.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device, comprises coal body sample, explosion cylinder mechanism, three axle loading systems, gases at high pressure impact system and coal body permeability determination system;
Described coal body sample is made up of coal cinder 1 and concrete cover 2, and described concrete cover 2 is arranged on the sidewall of coal cinder 1 surrounding;
Described explosion cylinder mechanism is made up of upper and lower cylinder head, cylinder barrel 6 and upper and lower pressure head, cylinder barrel 6 is vertically arranged, the bottom of cylinder barrel 6 is provided with lower cylinder lid 8, the top of cylinder barrel 6 is provided with upper cylinder lid 7, described upper and lower cylinder head and cylinder barrel 6 form seal cavity; Be provided with axial compression at the middle part of upper cylinder lid 7 and load through hole 43, the bottom center place of upper cylinder lid 7 is provided with upper cover groove 44, the top of described seaming chuck 9 is arranged in upper cover groove 44, and the middle part on seaming chuck 9 vertical direction is provided with seaming chuck through hole 41; The center of top place of lower cylinder lid 8 is provided with lower cover groove 44, and the bottom of described push-down head 10 is provided with protruding 48, and the projection 48 of push-down head 10 is arranged in lower cover groove 45; Middle part on push-down head 10 and lower cylinder lid 8 vertical direction is respectively arranged with push-down head through hole 17 and lower cylinder lid through hole 42, and push-down head through hole 17 is connected with lower cylinder lid through hole 42; Between described upper and lower pressure head, be provided with coal body sample, the coal cinder 1 of coal body sample is provided with vertical blast hole 3, described blast hole 3 is connected with seaming chuck through hole 41;
Described three axle loading systems are made up of axial compression loading system 14 and confined pressure loading system 34, and described axial compression loading system 14 and confined pressure loading system 34 all adopt the loading system of MTS815.03 rock triaxial test device; Described axial compression loading system 14 is arranged on the top of seaming chuck 9, and the top of described axial compression loading system 14 loads by the axial compression of upper cylinder lid 7 in explosion cylinder mechanism the outside that through hole 43 is arranged on explosion cylinder mechanism; Three through holes 16 are provided with in axial compression loading system 14, three through holes 16 are made up of first, second, third through hole, described first, second, third through hole is connected, and the first through hole is wherein connected with the seaming chuck through hole 41 of seaming chuck 9 in explosion cylinder mechanism; Described confined pressure loading system 34 is arranged on the outside of explosion cylinder mechanism, confined pressure loading system 34 is connected with cylinder hydraulic hand-hole 18 by confined pressure connecting pipe 49, confined pressure connecting pipe 49 is provided with the 3rd hand control valve 21, between the 3rd hand control valve 21 and confined pressure loading system 34, on the confined pressure connecting pipe 49 of confined pressure loading system 34, is provided with the 3rd digital pressure gauge 26;
Described gases at high pressure impact system is by being arranged on the gas explosion rifle 4 of explosion cylinder mechanism inside and being arranged on the power electro-induction electrically-controlled valve 23 of explosion cylinder mechanism outside, high pressure tank 39, multiport valve 37, air compressor machine 36 and gas source bottle 35 and forming; The rifle head of described gas explosion rifle 4 is arranged in the blast hole 3 of coal body sample, is filled with sealing of hole cementing agent 5 seals in the porch of blast hole 3, between gas explosion rifle 4 and blast hole 3; Gas explosion rifle 4 afterbody is connected with the one end of the gas piping 38 be arranged in seaming chuck through hole 41, the other end of described gas piping 38 is arranged on by seaming chuck through hole 41 in first through hole of three through holes 16, second through hole of three through holes 16 is connected by gas piping 38 with one end of power electro-induction electrically-controlled valve 23, the described other end of power electro-induction electrically-controlled valve 23 is connected by gas piping 38 with one end of high pressure tank 39, and the other end of described high pressure tank 39 is connected by gas piping 38 with a port of multiport valve 37; Described power electro-induction electrically-controlled valve 23 discharges the gases at high pressure circulation impact coal cinder 1 in high pressure tank 39 automatically, make coal cinder 1 crack fracturing anti-reflection, another two ports of described multiport valve 37 are connected by gas piping 38 with air compressor machine 36, gas source bottle 35 respectively; The 5th digital pressure gauge 28 is provided with between power electro-induction electrically-controlled valve 23 and high pressure tank 39, on the gas piping 38 of high pressure tank 39, gas piping 38 between multiport valve 37 and gas source bottle 35 is provided with the 4th hand control valve 22, between the 4th hand control valve 22 and gas source bottle 35, on the gas piping 38 of gas source bottle 35, is provided with the 4th digital pressure gauge 27;
Described coal body permeability determination system forms by being arranged on the methane gas cylinder 29 of explosion cylinder mechanism outside, tank 32 and graduated cylinder 33; Be connected by methane gas piping 30 between described methane gas cylinder 29 with the third through-hole of three through holes 16 in axial compression loading system, methane gas piping 30 is provided with the first hand control valve 19, between the first hand control valve 19 and methane gas cylinder 29, on the methane gas piping 30 of methane gas cylinder 29, is provided with the first digital pressure gauge 24; Be inverted in described tank 32 and be provided with graduated cylinder 33, one end of methane wireway 31 is connected with lower cylinder lid through hole 42, and the other end is arranged in graduated cylinder 33; Methane wireway 31 is provided with the second hand control valve 20, between the second hand control valve 20 and lower cylinder lid through hole 42, on the methane wireway 31 of lower cylinder lid through hole 42, is provided with the second digital pressure gauge 25.
The bottom margin of described upper cylinder lid 7 is provided with upper groove 46, the top of described lower cylinder lid 8 is provided with low groove 47, and upper and lower groove location is corresponding; Top and the bottom of described cylinder barrel 6 are separately positioned in upper and lower groove.
Described upper cylinder lid 7 is connected by upper cylinder cap bolt 11 with cylinder barrel 6, and lower cylinder lid 8 is connected by lower cylinder cap bolt 12 with cylinder barrel 6, is connected between push-down head 10 with lower cylinder lid 8 by push-down head bolt 13.
Described lower cylinder lid 8 is provided with cylinder hydraulic hand-hole 18, and described confined pressure connecting pipe 49 is connected with explosion cylinder mechanism inner space by cylinder hydraulic hand-hole 18.
The lower surface of described seaming chuck 9 and the upper surface of push-down head 10 are provided with the groove of dark 5mm, and the two ends of described coal body sample are separately positioned in groove.
Described coal body sample be by be highly 300mm, the concrete cover 2 of width to be the regular hexahedron coal cinder 1 of 300mm and thickness be 50mm forms.
Over-pressure safety device 40 is had in described high pressure tank 39 outer setting.
The hole depth of described blast hole 3 is 2/3 of coal body specimen height.
The diameter of described blast hole 3 is 20mm.
Axial compression between described axial compression loading system 14 and upper cylinder lid 7 loads in through hole 43 and is provided with O-ring seal 15.
Described sealing of hole cementing agent 5 adopts high-strength concrete or the high-strength resin glue of rapid hardening, and sealed borehole length is 1/3 of blast hole 3 hole depth.
Described methane gas piping 30, methane wireway 31, confined pressure connecting pipe 49 and gas piping 38 are steel pipe.
Described gas source bottle 35 adopts nitrogen gas cylinder.
Described gas explosion rifle 4 rifle head is placed in 1/2 ~ 2/3 position of blast hole 3 hole depth.
Described over-pressure safety device 40 is closed circular tubular, adopts high-strength steel sheet parcel high pressure tank 39 seamless welding to form.
Air compressor machine 36 model that the present invention adopts is W-2.0/400; Power electro-induction electrically-controlled valve 23 model is SVY series high voltage type solenoid valve; High pressure tank 39 model is HJL400-106 ~ 180-5.6.
Below in conjunction with accompanying drawing, a use procedure of the present invention is described:
Open first, second hand control valve, 0.2 ~ 0.4MPa methane gas enters in the blast hole 3 of coal cinder 1 by methane gas piping 30, ooze out in coal cinder 1 again, enter in the graduated cylinder 33 in tank 32 through methane wireway 31, water is full of in tank 32 and graduated cylinder 33, and graduated cylinder 33 is inverted in tank 32, adopt draining water gathering of gas law can measure anti-reflection before or anti-reflection after coal body permeability; Close first, second hand control valve, open the 3rd hand control valve 21, open dynamic triaxial loading system, slowly synchronous (axial compression 6MPa after setting shaft, confined pressure value is loaded on to coal body sample three axle, confined pressure 4MPa), open the 4th hand control valve 22, start air compressor machine 36, the gas in gas source bottle 35 is pressurized and be delivered in high pressure tank 39.When the gaseous tension in high pressure tank 39 reaches preset value (15MPa), power electro-induction electrically-controlled valve 23 is opened automatically, gases at high pressure in high pressure tank 39 pass through abrupt release in the blast hole 3 of gas explosion rifle 4 in coal cinder 1 through gas piping 38, impact coal cinder 1, air compressor machine 36 continues pressure gas, when the gaseous tension in high pressure tank 39 reaches after preset value (15MPa) again, again discharge and impact coal cinder 1, so move in circles and impact coal cinder 1, make coal cinder 1 produce a large amount of quick-fried raw cracks, obtain the antireflective effect of expection.
Claims (7)
1. a hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device, is characterized in that comprising coal body sample, explosion cylinder mechanism, three axle loading systems, gases at high pressure impact system and coal body permeability determination system;
Described coal body sample is made up of coal cinder and protective seam, and described protective seam is arranged on the sidewall of coal cinder surrounding;
Described explosion cylinder mechanism is made up of upper and lower cylinder head, cylinder barrel and upper and lower pressure head, cylinder barrel is vertically arranged, the bottom of cylinder barrel is provided with lower cylinder lid, the top of cylinder barrel is provided with upper cylinder lid, described upper and lower cylinder head and cylinder barrel form seal cavity; Be provided with axial compression at the middle part of upper cylinder lid and load through hole, the bottom center place of upper cylinder lid is provided with upper cover groove, and the top of described seaming chuck is arranged in upper cover groove, and the middle part on seaming chuck vertical direction is provided with seaming chuck through hole; The center of top place of lower cylinder lid is provided with lower cover groove, and the bottom of described push-down head is provided with projection, and the projection of push-down head is arranged in lower cover groove; Middle part on push-down head and lower cylinder lid vertical direction is respectively arranged with push-down head through hole and lower cylinder lid through hole, and push-down head through hole is connected with lower cylinder lid through hole; Between described upper and lower pressure head, be provided with coal body sample, the coal cinder of coal body sample is provided with vertical blast hole, described blast hole is connected with seaming chuck through hole;
Described three axle loading systems are made up of axial compression loading system and confined pressure loading system, described axial compression loading system is arranged on the top of seaming chuck, and the top of described axial compression loading system loads by the axial compression of upper cylinder lid in explosion cylinder mechanism the outside that through hole is arranged on explosion cylinder mechanism; In axial compression loading system, be provided with three through holes, three through holes are made up of first, second, third through hole, and described first, second, third through hole is connected, and the first through hole is wherein connected with the seaming chuck through hole of seaming chuck in explosion cylinder mechanism; Described confined pressure loading system is arranged on the outside of explosion cylinder mechanism, confined pressure loading system is connected with explosion cylinder mechanism inner space by confined pressure connecting pipe, confined pressure connecting pipe is provided with the 3rd hand control valve, between the 3rd hand control valve and confined pressure loading system, on the confined pressure connecting pipe of confined pressure loading system, is provided with the 3rd digital pressure gauge;
Described gases at high pressure impact system is by being arranged on the gas explosion rifle of explosion cylinder mechanism inside and being arranged on the power electro-induction electrically-controlled valve of explosion cylinder mechanism outside, high pressure tank, multiport valve, air compressor machine and gas source bottle and forming; The rifle head of described gas explosion rifle is arranged in the blast hole of coal body sample, is filled with sealing of hole cementing agent seals in the porch of blast hole, between gas explosion rifle and blast hole; Gas explosion gun breech portion is connected with the one end of the gas piping be arranged in seaming chuck through hole, the other end of described gas piping is arranged in the first through hole of three through holes by seaming chuck through hole, second through hole of three through holes is connected by gas piping with one end of power electro-induction electrically-controlled valve, the other end of described power electro-induction electrically-controlled valve is connected by gas piping with one end of high pressure tank, and the other end of described high pressure tank is connected by gas piping with multiport valve port; Another two ports of described multiport valve are connected by gas piping with air compressor machine, gas source bottle respectively; The 5th digital pressure gauge is provided with between power electro-induction electrically-controlled valve and high pressure tank, on the gas piping of high pressure tank, gas piping between multiport valve and gas source bottle is provided with the 4th hand control valve, between the 4th hand control valve and gas source bottle, on the gas piping of gas source bottle, is provided with the 4th digital pressure gauge;
Described coal body permeability determination system forms by being arranged on the methane gas cylinder of explosion cylinder mechanism outside, tank and graduated cylinder; Be connected by methane gas piping between described methane gas cylinder with the third through-hole of three through holes in axial compression loading system, methane gas piping is provided with the first hand control valve, between the first hand control valve and methane gas cylinder, on the methane gas piping of methane gas cylinder, is provided with the first digital pressure gauge; Be inverted in described tank and be provided with graduated cylinder, one end of methane wireway is connected with lower cylinder lid through hole, and the other end is arranged in graduated cylinder; Methane wireway is provided with the second hand control valve, between the second hand control valve and lower cylinder lid through hole, on the methane wireway of lower cylinder lid through hole, is provided with the second digital pressure gauge; The bottom margin of described upper cylinder lid is provided with upper groove, the top of described lower cylinder lid is provided with low groove, and upper and lower groove location is corresponding; The top of described cylinder barrel and bottom are separately positioned in upper and lower groove.
2. hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device according to claim 1, it is characterized in that covering at described lower cylinder being provided with cylinder hydraulic hand-hole, described confined pressure connecting pipe is connected with explosion cylinder mechanism inner space by cylinder hydraulic hand-hole.
3. hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device according to claim 1, it is characterized in that being provided with groove on the lower surface of described seaming chuck and the upper surface of push-down head, the two ends of described coal body sample are separately positioned in groove.
4. hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device according to claim 1, is characterized in that there is over-pressure safety device in described high pressure tank outer setting.
5. hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device according to claim 1, is characterized in that the hole depth of described blast hole is 2/3 of coal body specimen height.
6. hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device according to claim 1, is characterized in that the seal length of the sealing of hole cementing agent between described gas explosion rifle and blast hole is 1/3 of blast hole hole depth.
7. hyposmosis coal body gases at high pressure cycle pulse fracturing anti-reflection experimental device according to claim 1, is characterized in that described gas explosion rifle rifle head is arranged on 1/2 ~ 2/3 position of blast hole hole depth.
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| RU2169346C2 (en) * | 1996-11-10 | 2001-06-20 | Товарищество с ограниченной ответственностью Научно-производственная фирма "АРК" | Method for breaking of rocks by blasting |
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