CN110685683B - Top-laying device and method for front-mixing abrasive water jet directional cutting top plate - Google Patents
Top-laying device and method for front-mixing abrasive water jet directional cutting top plate Download PDFInfo
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- CN110685683B CN110685683B CN201911031947.8A CN201911031947A CN110685683B CN 110685683 B CN110685683 B CN 110685683B CN 201911031947 A CN201911031947 A CN 201911031947A CN 110685683 B CN110685683 B CN 110685683B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
- E21C25/60—Slitting by jets of water or other liquid
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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
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
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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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Abstract
The invention belongs to the technical field of control of surrounding rocks of coal stopes and roadways, and particularly discloses a top-setting device and a method for directionally cutting a top plate by a front mixed abrasive water jet, wherein the top-setting device comprises a water supply tank, an anchor stirrer arranged in the water supply tank, a water pump is arranged at the top of the water supply tank, abrasive water in the water supply tank is pumped into a slurry pump through a water outlet pipeline by the water pump, a pressure gauge is arranged on a water outlet pipeline of the slurry pump, an outlet of the water outlet pipeline is communicated with a directional drill rod, a drill rod transmission device is arranged at an inlet end of the directional drill rod, the directional drill rod outlet end is provided with a drill rod direction control device, and the directional drill rod outlet is provided with a slotting drill bit.
Description
Technical Field
The invention belongs to the technical field of control of surrounding rocks of coal stopes and roadways, and particularly relates to a roof caving device and method for directionally cutting a roof by means of front mixing abrasive water jet.
Background
The occurrence condition of the coal seam in China is complex, wherein the roof is hard and difficult to collapse, the roof has high rock strength, large thickness and strong integrity, the roof is difficult to collapse naturally after the coal seam is mined, air leakage can be generated in a goaf, the roof suddenly collapses and brings goaf gas to a working surface to cause gas overrun, the strength of primary pressure is increased, the working surface is damaged, and even a roadway is collapsed, so that the roof has great significance for researching the method for controlling roof caving of the hard roof of the coal seam.
The existing coal seam roof cutting method mainly comprises the steps of hydraulic slotting, blasting slotting, dense drilling slotting, slotting machine slotting and the like, wherein the hydraulic slotting has the problems that the use pressure is too high, the slotting is too shallow and is not easy to apply on site, the blasting slotting has adverse effects on underground gas control work and surrounding rock of a stope in the charging and detonating processes, the danger is high, the dense drilling slotting is obvious in effect but too high in cost and is not easy to popularize and use on a large scale, and the slotting machine slotting has the current situations that equipment of the slotting machine is heavy, the slotting machine is not easy to move, the slotting depth is shallow, a large amount of dust is generated to pollute the roof surrounding rock on the upper part of a roadway and the roof surrounding rock on the upper part of the roadway cannot be effectively cut.
The abrasive water jet can solve the problems of too high water flow pressure and too shallow slotting depth in high-pressure water jet slotting, and increase the safety of the whole system, compared with blasting slotting, the abrasive water jet slotting machine is safer and more reliable, is more economical and easier to implement than dense drilling slotting, has better slotting effect than slotting machines and does not generate dust pollution. The abrasive water jet can be further divided into a front mixed abrasive water jet and a rear mixed abrasive water jet, compared with the front mixed abrasive water jet of the rear mixed abrasive water jet, the front mixed abrasive water jet has the advantages that the abrasive water jet is fully and uniformly mixed with the abrasive, the acceleration time of abrasive particles is long, the obtained energy is higher, the rock cutting effect is more remarkable, and therefore, the front mixed abrasive water jet effect is better under the same condition. The currently adopted directional roof cutting method mainly adopts directional blasting to cut, the method has great danger in the process of charging and detonating to produce adverse effects on underground gas control work and surrounding rock of stope, and no safer roof directional cutting method is adopted nowadays.
Disclosure of Invention
The invention aims to provide a top caving device and method for directional cutting of a top plate by a front mixed abrasive water jet, wherein the device can adopt a drilling hole which is completed by construction of the front mixed high-pressure abrasive water jet pressurized by a slurry pump at a cutting hole position to adjust the direction of a slotting nozzle by a drill rod direction control device so as to realize directional slotting of the top plate to form a prefabricated directional crack, and a crack network is formed on the top plate by adopting a directional hydraulic fracturing method after hole sealing so as to control top caving, realize top plate collapse, weaken the primary pressing strength of the old top and ensure the safety of a working surface.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a top setting device of directional cutting roof of front mixed abrasive water jet, includes the supply tank, installs the anchor agitator in the supply tank, the supply tank top is equipped with the water pump, and the inside abrasive water of supply tank is through the water pump through outlet pipe way pump in the slush pump, be equipped with the manometer on the outlet pipe way of slush pump, outlet pipe way export is linked together with directional drilling rod, and directional drilling rod inlet end is equipped with drilling rod transmission, and directional drilling rod exit end is equipped with drilling rod directional control device, and directional drilling rod exit is equipped with the slotting drill bit.
Further, the drilling rod transmission device comprises two support piers which are arranged left and right in parallel, a transverse through hole is formed in the top and the bottom of each support pier, two parallel screw rods are arranged between the two support piers, two ends of each screw rod are rotatably connected with the support piers through support bearings arranged in the through holes, the leftmost end of each screw rod is driven to rotate through a motor, an oriented drilling rod mounting hole is further formed in the middle of each support pier, an oriented drilling rod penetrates through the oriented drilling rod mounting hole, the drilling rod transmission device further comprises a transmission plate which is perpendicular to the screw rods, the transmission plate is movably connected with the upper screw rods and the lower screw rods through round screw threads arranged on the back of the transmission plate, the middle of the back of the transmission plate is further provided with a positioning hoop movably connected with the oriented drilling rod, and bolts are further arranged on the positioning hoop.
Further, directional drilling rod comprises multistage end to end's drilling rod, and every section drilling rod both sides are equipped with a flank respectively, and two flanks set up along drilling rod axial direction, and every section drilling rod left side is equipped with a U type female joint, and the drilling rod right side is equipped with one and female joint complex public joint, and every female joint is upper and lower inboard all is equipped with a draw-in groove, all is equipped with an annular groove on every public joint, is equipped with the sealing washer in the annular groove, and the annular groove left side is equipped with an annular bulge, and the draw-in groove mutual card and the seal on the female joint through the annular bulge on the public joint between the adjacent drilling rod.
Further, drilling rod direction control device includes the ring flange, ring flange middle part upper surface is equipped with circular carousel, and circular carousel bottom is equipped with T type boss, and ring flange upper surface still is equipped with the annular groove, and T type boss is located the annular groove and drives circular carousel and do gyration motion along the annular groove, and circular carousel is equipped with two handles along radial, and the line of two handles is 90 contained angles with circular carousel normal contained angle, still is equipped with the bolt hole on the ring flange, and expansion bolts passes the bolt hole and passes ring flange fixed mounting on appointed position wall, all open on circular carousel and the ring flange has the constant head tank, directional drilling rod gets into the drilling from the constant head tank.
Further, two slotting nozzles are arranged at the end part of the slotting drill bit along the radial direction, the two slotting nozzles are symmetrically arranged along the side wall shaft of the slotting drill bit, the connecting line of the two slotting nozzles is perpendicular to the axis direction of the drill rod, the two nozzles are respectively arranged on the extension lines of the two side wings of the directional drill rod, the slotting nozzles adopt cone convergence type nozzles, and the diameter of the throat part of the nozzles is 3mm.
A method of a roof setting device for front-mixing abrasive water jet directional cutting of a roof, comprising the steps of:
1) After the wall surface open-cut construction is completed, before the coal seam working surface is not mined, drilling a row of holes on a top plate at the rear part of the hydraulic support by using a drilling machine, wherein the included angle between the drilling axis direction and the horizontal direction is 90 degrees, and the distance between adjacent holes is 10m until the drilling is stopped at the position of 1m when the old roof passes through the overburden layer;
2) Using a top setting device for directionally cutting a top plate based on abrasive water jet to perform directional slotting in a pre-drilled drilling hole, cutting an old top, enabling a plane formed by two slotting nozzles of a slotting drill bit and a directional drill rod connected with the two slotting nozzles to be parallel to a working surface by adjusting a drill rod direction control device, enabling the drill rod to gradually retreat by adjusting a drill rod transmission device, and adopting retreating type slotting to symmetrically slotting on two sides in the drilling hole 16 until the slotting is stopped at a position where the direct top and the old top meet along an axial line upwards by1 m;
3) After the slotting is completed, a capsule hole packer is adopted to seal holes for drilling the directional slotting, and the holes are sealed from the bottom of the holes in the range of 1m along the axial direction and the range of 1m upwards along the axial direction at the intersection of the direct top and the old top, wherein the hole sealing depth is at least 1m;
4) And after hole sealing is completed, high-pressure water is adopted for directional fracturing, so that the aim of weakening the top plate and controlling top caving is fulfilled.
Further, the wall surface in the step 1) is formed by a horizontal coal bed, a direct roof, an old roof and an overburden layer from bottom to top.
Further, the water pressure of the high-pressure abrasive in the step 2) is 30MPa, the weight ratio of the abrasive to the water in the water tank is 13%, and the high-pressure abrasive water jet starts to slit from a position 1.5m away from the hole bottom along the axial direction of the drill hole.
Further, in the step 4), the formula is calculated according to the dead weight stress of the rock mass: Severe degree Depth of burialThe dead weight stress and horizontal stress of the old roof can be calculatedIs self-weight stressAccording to the calculation formula of the hydraulic fracturing initiation pressure of the rock stratum: Wherein the side pressure coefficient ,For drilling radius, can calculate old jack-up fracture pressure, hydraulic fracturing uses high-pressure water pump, water pump water inlet connects static pressure water, the delivery port connects the high-pressure rubber tube, the water injection pipe is connected to the other end of high-pressure rubber tube, after connecting, let-off water and then switch on to carry out the water injection for the high-pressure water pump, slowly pressurize and record water pump manometer and manual pump manometer reading, continue to pressurize until prefabricated directional crack fracture water pressure can suddenly drop at this moment, continue the pressurize water injection, pressurize 0.5h, let the crack continue to expand and make adjacent drilling hydraulic fracture's crack link up, form the crack network, thereby reach the purpose that weakens roof control roof caving.
The invention has the advantages that:
1. The device adopts a stirrer to uniformly mix abrasive and water, then pressurizes the abrasive and water into high-pressure abrasive water flow through a slurry pump, then the high-pressure abrasive water flow passes through a directional drill rod and then passes through a drill rod transmission device to realize the movement of the drill rod in a drilled hole, the drill rod and the drill bit direction are regulated through a drill rod direction control device, the front mixed high-pressure abrasive water jet directionally cuts a top plate to form a prefabricated directional crack, then a capsule hole packer is used for sealing holes, then high-pressure water is used for directional hydraulic fracturing, and the slit gaps in adjacent drilled holes are communicated through the fracturing slits to form a crack network, so that the aim of controlling roof caving to weaken the top plate is realized;
2. The grinding water is conveyed to the slurry pump by adopting the water pump, so that stable and continuous feeding of the slurry pump can be realized, and the stability of the formed front mixed grinding water jet is ensured, thereby ensuring the good rock breaking effect;
3. pressurizing the mixed low-pressure abrasive water by adopting a slurry pump, wherein the high-pressure abrasive water pressurized by the slurry pump has the characteristics of high static pressure and low dynamic pressure, and the high-pressure abrasive water with the characteristics can greatly reduce the abrasion to a pipeline;
4. Compared with the rear mixed abrasive water jet, the front mixed abrasive water jet is adopted, the abrasive and water are fully and uniformly mixed, the acceleration time of abrasive particles is long, the obtained energy is high, the cutting effect on rock is more remarkable, and the working pressure can be greatly reduced;
5. Compared with the methods of hydraulic slotting, blasting slotting, dense drilling slotting, slotting machine slotting and the like, the method for directionally cutting the top plate by using the pre-mixed abrasive water jet has the advantages of deeper slotting effect, safety, high efficiency, easy operation and convenient popularization;
6. The drill rod direction control device is used for controlling the direction of the conical converging nozzle on the slotting drill bit through the directional drill rod, so that directional front mixing type high-pressure abrasive water jet slotting is realized, prefabricated directional cracks can be generated, high-pressure hydraulic fracturing is easier to implement in slotting drilling after the directional cracks are formed, a crack network can be formed by utilizing the cracks formed by the hydraulic fracturing to the greatest extent, and roof caving is controlled to achieve the aim of weakening a roof.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic plan view of the drill rod assembly of the present invention;
FIG. 3 is a cross-sectional view of the drill rod assembly of the present invention;
FIG. 4 is a schematic view of the directional drilling rod of the present invention;
FIG. 5 is a schematic plan view of a drill pipe directional control apparatus according to the present invention;
FIG. 6 is a cross-sectional view of the drill rod directional control device of the present invention;
FIG. 7 is a cross-sectional view of a slot drill of the present invention;
FIG. 8 is a cross-sectional view of an embodiment of the present invention;
FIG. 9 is a plan view of an embodiment of the present invention;
1. Anchor agitator, 2, water tank, 3, water pump, 4, pipe, 5, mud pump, 6, manometer, 7, transmission, 7.1, support pier, 7.2, motor, 7.3, bearing, 7.4, drive plate, 7.5, screw, 7.6, locating collar, 7.7, lead screw, 7.8, bolt, 8, directional drill pipe, 8.1, flank, 8.2, clamping groove, 8.3, female joint, 8.4, annular boss, 8.5, annular groove, 8.6, male joint, 9, directional control device, 9.1, expansion bolt, 9.2, flange plate, 9.3, handle 9.4, circular turntable, 9.5, locating groove, 9.6, annular groove, 9.7, T-shaped boss, 10, slotted drill bit, 10.1, cone convergence nozzle, 11, overburden, 12, old roof, 13, direct roof, 14, hydraulic bracket, 15, coal seam, 16, and drill hole.
Detailed Description
As shown in figures 1,2,3,4,5,6 and 7, the top-setting device for the front-mixing abrasive water jet directional cutting top plate comprises an anchor stirrer 1, a water supply tank 2, a water pump 3, a pipeline 4, a slurry pump 5, a pressure gauge 6, a drill rod transmission device 7, a directional drill rod 8, a drill rod direction control device 9, a hydraulic pump 5 and a hydraulic pump 6, A slot drill 10, etc.; the drill rod transmission device 7 comprises two support piers 7.1 which are arranged left and right in parallel, a transverse through hole is formed in the top and the bottom of each support pier 7.1, two parallel screw rods 7.7 are arranged between the two support piers 7.1, two ends of each screw rod 7.7 are rotatably connected with the support piers 7.1 through support bearings 7.3 arranged in the through holes, the leftmost end of each screw rod 7.7 is driven to rotate through a motor 7.2, an oriented drill rod mounting hole is further formed in the middle of each support pier 7.1, an oriented drill rod penetrates through the oriented drill rod mounting hole, the drill rod transmission device 7 further comprises a transmission plate 7.4 which is perpendicular to the screw rods 7.7, the transmission plate 7.4 is movably connected with the screw rods 7.7 through round threads 7.5 arranged on the back of the transmission 7.4, the screw threads 7.5 are connected with the screw rods 7.7, a positioning hoop 7.6 which is movably connected with the oriented drill rod 8 is further arranged in the middle of the back of the transmission plate 7.4, and the positioning hoop 7.6 is further provided with a bolt 7.8; the directional drill rod 8 consists of a plurality of sections of drill rods which are connected end to end, two sides of each section of drill rod are respectively provided with a flank 8.1, two flanks 8.1 are arranged along the axial direction of the drill rod, the left side of each section of drill rod is provided with a U-shaped female joint 8.3, the right side of the drill rod is provided with a male joint 8.6 matched with the female joint 8.3, the upper inner side and the lower inner side of each female joint 8.3 are respectively provided with a clamping groove 8.2, each male joint 8.6 is provided with an annular groove 8.5, a sealing ring is arranged in each annular groove 8.5, the left side of each annular groove 8.5 is provided with an annular bulge 8.4, adjacent drill rods are mutually clamped and sealed with the clamping grooves 8.2 on the female joint 8.3 through the annular bulge 8.4 on the male joint 8.6, the drill rod direction control device 9 comprises a flange plate 9.2, the upper surface of the middle part of the flange plate 9.2 is provided with a circular rotary disc 9.4, the bottom of the circular rotary disc 9.4 is provided with a T-shaped boss 9.7, the upper surface of the flange plate 9.2 is also provided with an annular groove 9.6, a T-shaped boss 9.7 is positioned in the annular groove 9.6 and drives a circular rotary table 9.4 to do rotary motion along the annular groove 9.6, the circular rotary table 9.4 is radially provided with two handles 9.3, the connecting line of the two handles 9.3 forms an included angle of 90 degrees with the normal line of the circular rotary table 9.4, the flange plate 9.2 is also provided with a bolt hole, an expansion bolt 9.1 passes through the bolt hole to fixedly mount the flange plate 9.2 on the wall surface at a designated position, positioning grooves 9.5 are respectively formed in the circular rotary table 9.4 and the flange plate 9.2, and a directional drill rod 8 enters a drill hole from the positioning grooves 9.5; in particular, when the abrasive jet directional cutting machine is used, water and abrasive in a water supply tank 2 are fully and uniformly mixed through stirring of an anchor stirrer 1, the mixed abrasive water is pumped into a slurry pump 5 through a pipeline 4 by a water pump 3 to be pressurized to form high-pressure abrasive water flow, the high-pressure abrasive water enters a directional drill rod 8 after passing through a pressure gauge 6, side wings 8.1 are arranged at two sides of the directional drill rod, the tail ends of the two side wings are the cutting nozzles arranged on the directional drill rod 8 in the axial direction, the cutting nozzles are conical convergent nozzles 10.1, the directional drill rod 8 can be controlled to realize a front mixed abrasive water jet directional cutting top plate, the directional drill rod 8 is connected through a quick joint, the front part of a male joint 8.6 is provided with an annular groove 8.5, the sealing ring 4 is arranged between the annular grooves, the annular grooves are internally provided with sealing rings, the sealing rings 4 are arranged inside the annular grooves, the clamping groove 8.2 arranged on the drill rod female joint 8.3 and the annular bulge 8.4 on the male joint are fixed through the U-shaped clamp, so that the connection tightness between drill rods is ensured, the directional drill rod 8 realizes the movement of the directional drill rod in a drill hole through the drill rod transmission device 7, the drill rod transmission device drives the screw rod 7.7 to rotate through the rotation of the motor 7.2 so as to realize the front-back movement of the transmission plate 7.4, wherein the screw rod is connected with the transmission plate through the screw thread 7.5, the transmission plate is provided with the positioning hoop 7.6, the positioning hoop fixes the directional drill rod 8 through the bolt 7.8, the directional drill rod enters the drill rod direction control device 9 after passing through the drill rod transmission device, the drill rod direction control device fixes the square flange plate 9.2 on a wall surface through the expansion bolt 9.1, the square flange plate 9.2 is provided with the annular groove 9.6, the round turntable 9.4 is arranged above the square flange plate 9.2, the T-shaped boss 9.7 is arranged at the lower part of the round turntable, the square flange plate 9.2 and the round turntable 9.4 are connected through the annular groove 9.6 and the T-shaped boss 9.7, the round turntable is radially provided with two handles 9.3, the connecting line of the two handles forms an included angle of 90 degrees with the normal line of the round turntable, the round turntable and the square flange plate are both provided with positioning grooves 9.5, the directional drill rod enters into a drill hole from the positioning grooves, the direction of a slotting nozzle at the tail end of the drill rod can be judged by controlling the handles on the round turntable to rotate the positions of the side wings of the drill rod, the slotting drill bit 10 is connected at the tail end of the directional drill rod, high-pressure abrasive water in the drill rod is conveyed to the slotting drill bit, the high-pressure abrasive water is further accelerated to be sprayed out through the conical converging nozzle 10.1, the slotting nozzle performs directional slotting on the rock body to form a prefabricated directional crack, after the rock body forms the prefabricated directional crack under the action of the slotting nozzle, the same slotting treatment is performed at the next position of the drill hole, after the whole process is finished, sealing holes of the slotted holes by using a capsule hole sealer, and then carrying out directional hydraulic fracturing in the top plate by using high-pressure water, so that the slotted gaps in the adjacent holes are communicated through the fracturing gaps, and the top plate forms a crack network so as to control roof caving and achieve the aim of weakening the top plate.
As shown in fig. 1,8 and 9, a slotting method of a roof setting device for directional cutting of a roof by a front mixed abrasive water jet is that a horizontal coal seam 15 (with the thickness of 2.5 m), a direct roof 13 (mudstone with the thickness of 4 m), an old roof 12 (dense sandstone with the thickness of 10 m), an overburden 11 (with the depth of 200 m) are subjected to directional slotting in a drill machine on a roof behind a hydraulic support 14 before a working face of the coal seam 15 is not mined after the completion of open-hole cutting, the axial direction of the drill holes forms an included angle of 90 degrees with the horizontal direction, the distance between the adjacent drill holes is 10m until the drill holes penetrate through the old roof and penetrate through the overburden 1m (as shown in fig. 8), then the roof setting device based on directional cutting of the old roof by the abrasive water jet is used, wherein the high-pressure abrasive water after being pressurized by a slurry pump can reach 30MPa at most, directional slotting is carried out in the pre-drilled drill holes 16, and the old roof is cut; when the high-pressure abrasive water jet slotting is carried out, the plane formed by the two slotting nozzles of the slotting drill bit and the directional drill rod connected with the slotting nozzles is parallel to the working face, so that the best fracturing effect is achieved in the later period, the high-pressure abrasive water jet slotting starts from a position 1.5m away from the hole bottom along the axial direction of the drill hole, the drill rod is gradually retreated by adjusting the drill rod transmission device, symmetrical slotting is adopted to two sides in the drill hole 16 (under the condition that the high-pressure abrasive water pressure is 30MPa, the flow of a slurry pump is 80m 3/h, the abrasive and water mass ratio in a water tank is 13 percent, the slotting effect can reach 1m at best, and the slotting is stopped to a position 1m upwards along the axial line at the intersection of the direct top and the old top.
After the slotting is completed, a capsule hole packer is adopted to seal holes for drilling the directional slotting, the holes are sealed from the bottom of the holes in the range of 1m along the axial direction and the range of 1m upwards along the axial direction at the intersection of the direct top and the old top, and the hole sealing depth is at least 1m. After hole sealing is completed, high-pressure water is adopted for directional fracturing, and a calculation formula is calculated according to the dead weight stress of the rock mass: Severe degree Depth of burialIt can be calculated that the dead weight stress of the old roof is 6MPa and the horizontal stress isIs self-weight stressHalf of (a) is provided. According to a calculation formula of the hydraulic fracturing initiation pressure of the rock stratum: Wherein the side pressure coefficient ,For the borehole radius, the old jack-up fracture pressure was calculated to be about 9 Mpa. The hydraulic fracturing uses the high-pressure water pump, the water inlet of the water pump is connected with static pressure water, the water outlet is connected with the high-pressure rubber pipe, the other end of the high-pressure rubber pipe is connected with the water injection pipe, the water is injected into the high-pressure water pump after the connection is correct, the water is firstly injected into the high-pressure water pump, the water is slowly pressurized, the readings of the water pump pressure gauge and the manual pump pressure gauge are recorded, the water is continuously pressurized until the prefabricated directional cracks are cracked, the water pressure can suddenly drop at the moment, the pressure is continuously maintained for water injection, the pressure is maintained for 0.5h, the cracks are continuously expanded to enable the cracks of the hydraulic fracturing of the adjacent drilling holes to be communicated, a crack network is formed, and the purpose of weakening the roof control caving is achieved. After the working face is pushed forward for a certain distance, the top plate does not collapse in time, and the same operation can be implemented in a goaf behind the hydraulic support to control roof caving, so that the aim of weakening the top plate is fulfilled.
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| CN112814560A (en) * | 2020-12-30 | 2021-05-18 | 重庆国翔新材料有限公司 | Deformation drill bit |
| CN112983266A (en) * | 2021-02-26 | 2021-06-18 | 无锡安丰基础工程有限公司 | Omnidirectional ultrahigh-pressure water jet rock cutting rotary drilling system |
| CN113187393B (en) * | 2021-03-16 | 2022-05-17 | 中煤科工集团重庆研究院有限公司 | Hydraulic cutting horizontal guiding device based on gravity guiding mechanism and using method |
| CN114000826B (en) * | 2021-10-19 | 2023-04-25 | 河南理工大学 | A device and method for breaking coal by using advanced pre-mixed pulsed abrasive water jet |
| CN114109337B (en) * | 2021-11-26 | 2023-09-19 | 中煤科工集团重庆研究院有限公司 | Self-adaptive grooving method and system for coal mine underground gas extraction drilling hole sealing section |
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| CN114151079B (en) * | 2021-12-09 | 2023-05-12 | 河南理工大学 | Roof cutting guiding fracturing device and method by utilizing advanced premixed abrasive water jet |
| CN114635695B (en) * | 2022-03-18 | 2023-01-03 | 中国矿业大学 | Axial crack-making pre-splitting method |
| CN117418819B (en) * | 2023-12-19 | 2024-05-14 | 中煤科工集团沈阳研究院有限公司 | Extraction drilling hole sealing process method and matched lancing device |
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