CN112709571A - Coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief - Google Patents
Coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief Download PDFInfo
- Publication number
- CN112709571A CN112709571A CN201911018240.3A CN201911018240A CN112709571A CN 112709571 A CN112709571 A CN 112709571A CN 201911018240 A CN201911018240 A CN 201911018240A CN 112709571 A CN112709571 A CN 112709571A
- Authority
- CN
- China
- Prior art keywords
- hole
- splitting
- shock wave
- coal
- controllable shock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention relates to a coal mine rock burst prevention and control technology, in particular to a coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief. The invention aims to solve the technical problems that the pressure of coal or/and rock deep parts cannot be relieved, the safety production risk is high or the balanced presplitting is difficult to realize in the existing coal mine tunnel rock burst prevention method, and provides a coal mine tunnel rock burst prevention method based on controllable shock wave presplitting pressure relief. According to the method, pre-splitting areas of coal or/and rock mass on the periphery of a roadway are communicated with each other along the depth direction and the circumferential direction of the roadway in a controllable shock wave pre-splitting mode to form a crushing ring layer, and the crushing ring layer is surrounded by outer complete coal or/and rock mass layers and inner complete coal or/and rock mass layers on two sides of the crushing ring layer to form a hard layer-soft layer-hard layer structure with a buffering function on the impact ground pressure.
Description
Technical Field
The invention relates to a coal mine rock burst prevention and control technology, in particular to a coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief.
Background
The rock burst is a sudden, violent and destructive power phenomenon generated by the instantaneous release of elastic deformation energy of coal or/and rock mass around a coal mine roadway and a working face, is often accompanied by instantaneous displacement, throwing, loud sound, air waves and the like of the coal or/and rock mass, and is one of typical power disasters in the coal mining process. The coal mine rock burst is not only large in harm degree and wide in influence range, but also is a root cause for inducing other major coal mine accidents, and disasters such as abnormal gas emission, coal and gas outburst, water inrush and gas explosion can be induced when the rock burst occurs, so that more serious consequences are caused.
Statistical analysis shows that various types of mines have related reports of rock burst occurrence, various coal beds have rock burst occurrence, related geological structures are simple to complex, the coal beds are from thin to thick to super-thick, inclination angles are from horizontal to steep, and rock burst accidents occur on conglomerate, sandstone, limestone and oil shale roofs; the shallow mining also frequently generates rock burst, and the frequency and the intensity of the rock burst are increased along with the increase of the deep mining depth; in terms of the coal mining method, the long wall, the short wall, the room-pillar type, the top coal caving, the layered mining and the like generate the overburdened pressure; in terms of coal mining technology, the rock burst is also generated in various technologies such as fully mechanized mining, general mining, blasting mining, water sand filling and the like. Since the occurrence of rock burst is sudden, instantaneous and destructive, it is difficult to determine in advance the time, place and intensity of its occurrence. Through years of research, various national scholars obtain important achievements on coal mine rock burst generation mechanism and prediction prevention and control technology, and provide important guarantee for safe mining of rock burst mines.
In the case of coal mine tunnels, since the tunnels are generally built at hard coal or/and rock masses which are generally complete, have few or only hidden cracks and have high brittleness and elasticity, and rock burst is very easy to occur when the coal or/and rock masses instantly release elastic deformation energy. In addition, if the groundwater is extremely low, the coal and/or rock mass is dry, and rock burst is also likely to occur.
The existing method for preventing and treating rock burst of coal mine tunnel mainly weakens the area to be weakened by a presplitting pressure relief method of regional coal or/and rock mass of initiating explosive device blasting or a hydraulic method of injecting water into the coal or/and rock mass, thereby achieving the purpose of preventing and treating the rock burst. Both of them are to create a broken ring layer in the coal or/and rock mass, when stratum stress concentrates or stratum comes to press, the broken ring layer is compacted at first, play the purpose of buffering, stratum pressure energy absorption, avoid rock burst and other sudden stress concentration phenomena to cause casualties and coal mine tunnel destruction. Wherein:
the method for pre-releasing the pressure of the coal or/and rock mass in the area where the initiating explosive device is exploded has the advantages that: the cost of initiating explosive devices and drilling construction is low. The disadvantages are that: firstly, the depth of a blasting drilling hole is generally 10-20m, the blasting drilling hole cannot act on the deep part of coal or/and rock mass, the distance between the drilling holes is 2-5m, and the drilling holes are too dense; secondly, the released energy is large, the safety production risk is large, and once a dummy gun exists, safety production accidents can be caused; thirdly, the management and control of the initiating explosive devices are strict, and the issuing and the use of the initiating explosive devices can be influenced by the holding of holidays or important activities; finally, after blasting by using the initiating explosive device, the drill hole is basically scrapped, and the drill hole cannot be secondarily utilized.
The hydraulic method for injecting water into coal or/and rock mass has the advantages that: the hole diameter of the drilled hole is small, the drilling construction difficulty is low, and the efficiency is high. The disadvantages are that: the stress weak area in the target area is easy to crack under the limitation of hydraulic pressure characteristics, once a main crack or a main crack facing to one direction is formed, new cracks are difficult to form in other directions, so that the pre-cracking direction is not controllable, and the balanced pre-cracking is difficult to realize.
In order to improve the pre-splitting effect, a high-pressure water injection measure can be adopted, the depth of a high-pressure water injection drill hole is less than 50m, the distance between the drill holes is 2-5m, high pressure of more than 20MPa is generally adopted when high-pressure water injection is carried out, the maintaining time generally exceeds 10 hours, and although the high-pressure water injection measure can improve the moisture content of coal or/and rock mass to a certain extent, the method can bring loss in time, space, safety and economy.
Disclosure of Invention
The invention aims to solve the technical problems that the pressure of coal or/and rock deep parts cannot be relieved, the safety production risk is high or the balanced presplitting is difficult to realize in the existing coal mine tunnel rock burst prevention method, and provides a coal mine tunnel rock burst prevention method based on controllable shock wave presplitting pressure relief.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
a coal mine roadway rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief is characterized by comprising the following steps:
1) carrying out mechanical analysis testing on coal or/and rock mass on the periphery of a roadway, carrying out on-site drilling of a plurality of verification drill holes, verifying the test result by utilizing the verification drill holes, and further determining the depth interval and the circumferential interval of the pre-splitting drill holes drilled in the coal or/and rock mass, the hole depth, the hole diameter and the pre-splitting operation range of each pre-splitting drill hole, the interval of adjacent operation points in the hole and the operation times of each operation point; the presplitting operation range is a presplitting operation section pointing from the bottom of the hole to the orifice along the depth direction of the presplitting drill hole;
2) drilling a plurality of pre-split drill holes at the set depth interval in the roadway along the roadway wall according to the set circumferential interval, hole depth and hole diameter, wherein the pre-split drill holes point to coal or/and rock mass on the periphery of the roadway from the roadway wall;
3) installing a hole sealing pipe, a hole flange and a hole sealing device at the hole opening of the pre-splitting drill hole;
4) conveying the controllable shock wave generating equipment into the pre-cracked drill hole through a drill rod by using a drilling machine;
5) closing the orifice by using the hole sealing pipe, the orifice flange and the orifice sealing device, and injecting water into the drill hole;
6) when the water pressure in the drill hole reaches 0.1-0.5MPa, the controllable shock wave generating equipment carries out pre-splitting operation from the operation point at the bottom of the hole according to the pre-splitting operation range determined in the step 1), the distance between the adjacent operation points in the hole and the operation frequency of each operation point;
7) after the operation amount of one operation point is finished, opening the hole, pumping back the drill rod by using the drilling machine to enable the controllable shock wave generating equipment to reach the next operation point, closing the hole again, and injecting water to continue the operation;
8) repeating the step 7), after all the operation points are processed, the drilling machine extracts the controllable shock wave generating equipment out of the pre-splitting drill hole, closes the drill hole or connects and extracts gas in the drill hole, and finishes the pre-splitting operation of the pre-splitting drill hole;
9) repeating the step 3) to the step 8), completing the pre-splitting operation of all the pre-split drill holes, and finishing the pre-splitting operation; at the moment, the pre-splitting areas of the coal or/and rock mass on the periphery of the roadway are communicated with each other along the depth direction and the circumferential direction of the roadway to form a crushing ring layer, and the crushing ring layer is surrounded by the outer complete coal or/and rock mass layer and the inner complete coal or/and rock mass layer on the two sides of the crushing ring layer to form a hard layer-soft layer-hard layer structure with a buffering function on the impact ground pressure.
Further, in the step 2), in order to perform uniform pre-cracking on the coal or/and rock mass at the periphery of the roadway, the roadway wall comprises a top plate and two sides of the roadway.
Further, in step 2), in order to perform sufficient and uniform pre-cracking on the coal or/and rock mass at the periphery of the roadway, the roadway wall comprises a top plate, a bottom plate and two sides of the roadway.
Further, in order to generate extremely high shock wave pressure in an extremely short time, in step 6), the amplitude of the pressure generated by a single impact when the controllable shock wave generating device performs the pre-splitting operation is 210 +/-50 MPa, and the impulse is 7200 +/-1000P & s.
Further, in order to obtain a sufficient thickness of the crushing ring layer to ensure the buffering effect, in the step 1), the pre-splitting operation range accounts for 20% of the depth of the pre-splitting drilled hole.
Further, in order to ensure that the pre-splitting areas of the coal or/and rock mass on the periphery of the roadway are mutually communicated along the depth direction of the roadway, in the step 1), the depth interval is 10-30 m.
Further, in order to ensure that the pre-splitting areas of the coal or/and rock mass on the periphery of the roadway are mutually communicated along the circumferential direction of the roadway, in the step 1), the circumferential interval is 10-30 m.
Further, in order to fully crush the crushing ring layer and thus play a good role in buffering rock burst, in the step 1), the hole depth of the pre-splitting drilled hole is 10-50m, and the hole diameter is 113 mm and 133 mm.
Further, in order to accurately position the position of the broken ring layer during pre-splitting operation and not damage complete coal or/and rock mass on the periphery of the broken ring layer, in the step 6), the operation precision of the controllable shock wave generating equipment is 0.5-1 m.
Further, in order to verify the test result obtained by the mechanical analysis more accurately, in the step 1), the number of the test results is 3-5.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a coal mine tunnel rock burst prevention and treatment method based on controllable shock wave presplitting pressure relief, which adopts presplitting type controllable shock waves to perform presplitting treatment on hard coal or/and rock mass, wherein the presplitting direction is uniformly radiated from an operation point to the periphery, a certain section of specific depth (namely a presplitting operation range) in a presplitting drilling hole can be subjected to balanced and continuous presplitting, cracks and communication cracks are directly created in hard coal or/and rock mass in a very short time, a crack net is formed in an action area, and more cracks are expanded and communicated along with the increase of the times of single-point operation, so that the presplitting areas of the hard coal or/and rock mass on the periphery of the tunnel are mutually communicated along the depth direction and the periphery of the tunnel to form a broken ring layer or a broken zone, and the hard coal or/and rock mass on the periphery of the tunnel is changed into a broken ring layer positioned on the middle layer and surrounded by complete coal or/and rock masses positioned, The hard layer-soft layer-hard layer structure with the buffer function for impact ground pressure does not have the problems of uncontrollable pre-splitting direction and unbalanced pre-splitting.
2. According to the coal mine roadway rock burst prevention and treatment method based on controllable shock wave presplitting pressure relief, the hole depth of the presplitting drill hole can be set to be 10-50m according to needs, and can reach 50m at the deepest, and compared with the hole depth of the blasting drill hole which is 10-20m and can reach 20m at the deepest, along with the increase of the coal mining depth, the drill hole can be deep into the coal or/and rock mass deep part according to needs, and the deep part is fully decompressed.
3. According to the coal mine roadway rock burst prevention and treatment method based on controllable shock wave presplitting pressure relief, presplitting type controllable shock waves are adopted to presplit hard coal or/and rock, presplitting process parameters such as a presplitting operation range, single-point operation times and operation point intervals can be adjusted according to specific requirements, so that the shock wave strength is controllable, the crushing strength is further controllable, the released energy is smaller than the energy released during blasting of initiating explosive devices, and the safety production risk is small.
4. According to the coal mine roadway rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief, the production process of a coal mine is not affected by the fact that initiating explosive devices are controlled.
5. The coal mine roadway rock burst prevention and control method based on controllable shock wave presplitting pressure relief, provided by the invention, has the advantages that after presplitting type controllable shock wave presplitting is adopted, hard coal or/and rock mass is presplitting, the presplitting drill hole is not damaged, the drill hole can be reused, namely, the presplitting drill hole for roadway scour prevention can continue gas extraction, and if the presplitting drill hole is positioned in a whole rock roadway, the coal mine roadway rock burst prevention and control method can be used for grouting rock mass and the like.
6. The coal mine roadway rock burst prevention and control method based on controllable shock wave presplitting pressure relief, provided by the invention, presplits are carried out by adopting presplitting type controllable shock waves, the fracturing radius is 5-15m, and the hole distribution spacing of presplitting drill holes can be enlarged to 10-30m compared with the 2-5m in the prior art, so that the number of the drill holes is greatly reduced, and the space and the cost are saved; the single-hole operation time is 4-8h, and a plurality of pre-splitting drill holes can be simultaneously operated, so that the time is saved, and the construction cost and the labor cost are reduced to a certain extent.
Drawings
FIG. 1 is a field construction drawing of a controllable shock wave generating device used in the present invention for drilling pre-split boreholes in coal or/and rock mass at the periphery of a coal mine tunnel;
FIG. 2 is a schematic illustration of the present invention performing a pre-split operation in a pre-split borehole;
FIG. 3 is an enlarged view of a portion of the pre-split borehole of FIG. 2;
FIG. 4 is a schematic structural view of a pre-split shaped charge bar used in the present invention;
FIG. 5 is a graph of pressure amplitude for a pre-split shaped bar used in the present invention;
FIG. 6 is a graph showing the effect of impact tests on a coal sample using a controlled shock wave, wherein a-d correspond to impact operations 0, 50, 100, and 150 times in sequence;
FIG. 7 is a test diagram of an impact test of a coal sample by using a controllable shock wave, wherein a-d correspond to a coal sample fracture real object diagram of impact operation for 0 time, 4 times, 6 times and 8 times in sequence, e-h are coal sample fracture sketch diagrams respectively corresponding to a-d, and i-l are coal sample fracture fractal dimension diagrams respectively corresponding to a-d;
description of reference numerals:
1-a drilling machine; 2-a drill rod; 3-a controllable shock wave generating device; 4-an orifice sealing device; 5-sealing the hole pipe; 6-orifice flange; 7-laneway; 81-outer layer complete coal or/and rock mass layer; 82-inner layer complete coal or/and rock mass layer; 9-pre-splitting the drilled hole; 10-operating point; 11-shock wave; 12-a broken ring layer;
31-drill pipe catcher; 32-an explosion-proof battery pack; 33-high voltage direct current power panel; 34-a storage capacitor and an energy controller; 35-an energy converter; 36-energy-gathering rod pusher; 37-presplitting energy-gathering rod.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
A coal mine roadway rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief comprises the following steps:
1) carrying out mechanical analysis test on coal or/and rock mass at the periphery of the roadway 7, carrying out on-site drilling of 3-5 verification drill holes, verifying the test result by utilizing the verification drill holes, and further reasonably determining that the depth interval (namely the interval between two adjacent pre-split drill holes 9 along the direction of the roadway 7) of the pre-split drill holes 9 drilled in the coal or/and rock mass is 10-30m, the circumferential interval is 10-30m, the hole depth of each pre-split drill hole 9 is 10-50m, the hole diameter is 113-133mm, the pre-split operation range, the interval between adjacent operation points 10 in the hole and the operation frequency of each operation point 10; as shown in fig. 3, the pre-splitting operation range is a pre-splitting operation section pointing from the bottom of the hole to the orifice along the depth direction of the pre-split borehole 9, and occupies 20% of the depth of the pre-split borehole 9;
2) drilling a plurality of pre-split drill holes 9 at the set depth interval in the roadway 7 along the roadway wall according to the set circumferential interval, hole depth and hole diameter, wherein the pre-split drill holes 9 point to the coal or/and rock mass at the periphery of the roadway 7 from the roadway wall; in order to uniformly pre-crack specific parts in the coal or/and rock mass at the periphery of the roadway 7, the roadway wall comprises a top plate and two sides of the roadway (of course, a bottom plate can also be included according to specific requirements);
3) as shown in fig. 1, installing a hole sealing pipe 5, a hole flange 6 and a hole sealing device 4 at the hole of a pre-split drill hole 9;
4) the controllable shock wave generating device 3 is sent into a pre-splitting drill hole 9 through a drill rod 2 by a drilling machine 1;
5) closing the orifice by using the hole sealing pipe 5, the orifice flange 6 and the orifice sealing device 4, and injecting water into the drill hole;
6) when the drill hole is filled with water and the water pressure reaches 0.1-0.5MPa, the controllable shock wave generating equipment 3 performs pre-splitting operation from the operation point 10 at the bottom of the hole according to the pre-splitting operation range determined in the step 1), the distance between the adjacent operation points 10 in the hole and the operation frequency of each operation point 10, wherein the operation precision of the controllable shock wave generating equipment 3 is 0.5-1m (namely the displacement precision of the controllable shock wave generating equipment 3 in the pre-splitting drill hole 9 is driven by the drill rod 2);
7) after the operation amount of one operation point 10 is finished, opening the hole, pumping back the drill rod 2 by using the drilling machine 1 to enable the controllable shock wave generating equipment 3 to reach the next operation point 10, closing the hole again, and injecting water to continue the operation;
8) repeating the step 7), after all the operation points 10 are processed, the drilling machine 1 pumps the controllable shock wave generating equipment 3 out of the pre-splitting drill hole 9, the drill hole is closed or gas in the drill hole is pumped out according to production requirements, the gas is connected with a pumping pipeline and reserved, and the gas is discharged one by one when the working face is stoped later, so that the pre-splitting operation of the pre-splitting drill hole 9 is finished; the single-hole operation time is 4-8h, and a plurality of pre-split drill holes 9 can be operated simultaneously, so that the time is saved, and the construction cost and the labor cost are reduced to a certain extent;
9) repeating the steps 3) to 8) to finish the pre-splitting operation of all the pre-split drill holes 9; as shown in fig. 2 and 3, at this time, the pre-splitting areas (pre-splitting operation ranges) of the specific positions in the coal or/and rock mass at the periphery of the roadway 7 are mutually communicated along the depth direction and the circumferential direction of the roadway 7 to form the fracture ring layer 12, and the fracture ring layer 12 is surrounded by the outer complete coal or/and rock mass layer 81 and the inner complete coal or/and rock mass layer 82 at the two sides thereof to form a 'hard layer-soft layer-hard layer' structure having a buffer function for the impact pressure.
In order to show the impact pre-splitting effect, the impact test of the controllable impact wave 11 on the coal sample is carried out, the experimental result is shown in fig. 6 and 7, fig. 6 shows the impact test effect graph of the controllable impact wave 11 on the coal sample (by means of an X-CT scanning technology, namely an electronic computer tomography scanning technology), and a-d correspond to impact for 0 time, 50 times, 100 times and 150 times in sequence; fig. 7 shows a test chart of an impact test of a coal sample by using a controllable shock wave, wherein a-d correspond to a coal sample fracture real object chart of impact operation for 0 time, 4 times, 6 times and 8 times in sequence, e-h are coal sample fracture sketch charts respectively corresponding to a-d, and i-l are coal sample fracture fractal dimension charts respectively corresponding to a-d, and it can be seen that the pre-splitting degree of the coal sample is gradually increased along with the increase of the operation times of single-point shock wave 11, and the balanced pre-splitting is gradually realized.
As shown in fig. 4, the controllable shock wave generating device 3 comprises a drill rod adaptor 31, an explosion-proof battery pack 32, a high-voltage direct current power supply board 33, an energy storage capacitor and energy controller 34, an energy converter 35 and an energy collecting rod pusher 36 which are coaxially and sequentially connected into a whole, wherein the high-voltage direct current power supply board 33 has the functions of inversion, boosting and rectification; the high-voltage direct-current power supply board 33 charges the energy storage capacitor, when the energy storage capacitor is charged to a breakdown threshold value, a large current breaks down the energy controller, electric energy stored by the energy storage capacitor is transmitted to the pre-splitting energy-collecting rod 37 in the energy converter 35 through the energy controller, and the large current gasifies, ionizes and explodes the pre-splitting energy-collecting rod 37 to generate shock waves; 10-50 pre-split energy collecting rods 37 can be loaded in the energy collecting rod pusher 36 at one time according to operation requirements, and when one pre-split energy collecting rod 37 is consumed, the energy collecting rod pusher 36 pushes the next pre-split energy collecting rod 37 to the energy converter 35. The controllable shockwave generating device 3 of the present invention may be a QZ-iii type controllable shockwave generating device manufactured by sienna flash energy science and technology ltd and its corresponding energy collecting rod, wherein the energy collecting rod is a pre-split energy collecting rod 37. Of course, other controllable shockwave generating devices that perform the same function may be used as the controllable shockwave generating device 3 of the present invention.
The controllable shock wave generating device 3 of the invention has an outer diameter of 89mm and a length of 5m (of course, the aperture of the pre-split drill hole 9 is related to the size of the controllable shock wave generating device 3, and when the size of the controllable shock wave generating device 3 is increased or decreased, the aperture of the pre-split drill hole 9 is increased or decreased); as shown in FIG. 5, the pressure amplitude of single impact generated by the pre-splitting energy-gathering rod 37 during pre-splitting operation is 210 + -50 MPa, and the impulse is 7200 + -1000 P.s.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (10)
1. A coal mine roadway rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief is characterized by comprising the following steps:
1) carrying out mechanical analysis testing on coal or/and rock mass at the periphery of the roadway (7), carrying out on-site drilling of a plurality of verification drill holes, verifying the test result by utilizing the verification drill holes, and further determining the depth interval and the circumferential interval of the pre-splitting drill holes (9) drilled in the coal or/and rock mass, the hole depth, the hole diameter and the pre-splitting operation range of each pre-splitting drill hole (9), the interval of adjacent operation points (10) in the hole and the operation times of each operation point (10); the pre-splitting operation range is a pre-splitting operation section pointing from the hole bottom to the orifice along the depth direction of the pre-splitting drill hole (9);
2) drilling a plurality of pre-split drill holes (9) at the set depth interval in the roadway (7) along the roadway wall according to the set circumferential interval, hole depth and hole diameter, wherein the pre-split drill holes (9) point to coal or/and rock mass on the periphery of the roadway (7) from the roadway wall;
3) installing a hole sealing pipe (5), a hole flange (6) and a hole sealing device (4) at the hole opening of the pre-splitting drill hole (9);
4) the controllable shock wave generating equipment (3) is conveyed into the pre-splitting drill hole (9) through the drill rod (2) by using the drilling machine (1);
5) the hole opening is closed by using the hole sealing pipe (5), the hole opening flange (6) and the hole opening sealing device (4), and water is injected into the drill hole;
6) when the water pressure in the drill hole reaches 0.1-0.5MPa, the controllable shock wave generating equipment (3) performs pre-splitting operation from the operation point (10) positioned at the bottom of the hole according to the pre-splitting operation range determined in the step 1), the distance between the adjacent operation points (10) in the hole and the operation frequency of each operation point (10);
7) after the operation amount of one operation point (10) is finished, opening a hole, pumping back the drill rod (2) by using the drilling machine (1), enabling the controllable shock wave generating equipment (3) to reach the next operation point (10), closing the hole again, and injecting water to continue operation;
8) repeating the step 7), after all the operation points (10) are processed, the drilling machine (1) pumps the controllable shock wave generating equipment (3) out of the pre-splitting drill hole (9), closes the drill hole or connects and pumps gas in the drill hole, and finishes the pre-splitting operation of the pre-splitting drill hole (9);
9) and (5) repeating the steps 3) to 8), completing the pre-splitting operation of all the pre-split drill holes (9), and finishing the pre-splitting operation.
2. The coal mine roadway rock burst control method based on controllable shock wave pre-splitting pressure relief as claimed in claim 1, wherein: in the step 2), the roadway wall comprises a top plate and two sides of the roadway.
3. The coal mine roadway rock burst control method based on controllable shock wave pre-splitting pressure relief as claimed in claim 1, wherein: in the step 2), the roadway wall comprises a top plate, a bottom plate and two sides of the roadway.
4. The coal mine roadway rock burst control method based on controllable shock wave pre-splitting pressure relief according to claim 1, 2 or 3, characterized by comprising the following steps: in the step 6), the amplitude of the pressure generated by single impact when the controllable shock wave generating equipment (3) performs pre-splitting operation is 210 +/-50 MPa, and the impulse is 7200 +/-1000P & s.
5. The coal mine roadway rock burst control method based on controllable shock wave presplitting pressure relief according to claim 4, characterized by comprising the following steps: in the step 1), the presplitting operation range accounts for 20% of the hole depth of the presplitting drill hole (9).
6. The coal mine roadway rock burst control method based on controllable shock wave pre-splitting pressure relief as claimed in claim 5, wherein: in the step 1), the depth interval is 10-30 m.
7. The coal mine roadway rock burst control method based on controllable shock wave presplitting pressure relief according to claim 6, characterized by comprising the following steps: in the step 1), the circumferential interval is 10-30 m.
8. The coal mine roadway rock burst control method based on controllable shock wave presplitting pressure relief according to claim 7, characterized by comprising the following steps: in the step 1), the depth of the pre-splitting drill hole (9) is 10-50m, and the aperture is 113 mm and 133 mm.
9. The coal mine roadway rock burst control method based on controllable shock wave presplitting pressure relief according to claim 8, characterized by comprising the following steps: in the step 6), the operation precision of the controllable shock wave generating equipment (3) is 0.5-1 m.
10. The coal mine roadway rock burst control method based on controllable shock wave pre-splitting pressure relief as claimed in claim 1, wherein: in the step 1), the number of the plurality of the units is 3-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911018240.3A CN112709571A (en) | 2019-10-24 | 2019-10-24 | Coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911018240.3A CN112709571A (en) | 2019-10-24 | 2019-10-24 | Coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112709571A true CN112709571A (en) | 2021-04-27 |
Family
ID=75540227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911018240.3A Pending CN112709571A (en) | 2019-10-24 | 2019-10-24 | Coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112709571A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117387557A (en) * | 2023-12-08 | 2024-01-12 | 中国云南路建集团股份公司 | Highway construction quality detection device |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915098A (en) * | 2010-07-14 | 2010-12-15 | 中国矿业大学 | Method for preventing and controlling rock burst through hydraulic cutting |
| CN102121394A (en) * | 2010-12-17 | 2011-07-13 | 神华集团有限责任公司 | Method for uncovering outburst coal seam by using pseudo lithosphere on laneway |
| CN102383728A (en) * | 2011-09-12 | 2012-03-21 | 山东科技大学 | Coal mine rockburst defect segmentation and control method |
| CN103726872A (en) * | 2013-12-30 | 2014-04-16 | 北京科技大学 | Oriented danger removing method for high mine pressure roadway of coal mine |
| US20140117739A1 (en) * | 2011-06-24 | 2014-05-01 | Ian Gray | Mining Method for Gassy and Low Permeability Coal Seams |
| CN104832198A (en) * | 2015-03-13 | 2015-08-12 | 中煤科工集团重庆研究院有限公司 | Roadway surrounding rock deformation, rock burst and coal and gas outburst comprehensive treatment method |
| WO2017096674A1 (en) * | 2015-12-11 | 2017-06-15 | 大同煤矿集团有限责任公司 | An above ground and underground cooperative control method of far and near field roofs of extra-large stoping space |
| CN107956505A (en) * | 2017-10-18 | 2018-04-24 | 西安交通大学 | Coal mine down-hole drilling anti-reflection method based on controllable shock wave technology |
| CN108756881A (en) * | 2018-05-24 | 2018-11-06 | 淮海工学院 | A kind of bump preventing control method in solid coal column pressure coal region |
| CN109268047A (en) * | 2018-11-01 | 2019-01-25 | 天地科技股份有限公司 | Laminated structure and method are unloaded in a kind of supporting in bump tunnel |
| CN110306984A (en) * | 2019-07-08 | 2019-10-08 | 辽宁工程技术大学 | A kind of baseboard of coal mine roadway type Controlling of Coal Outburst method |
-
2019
- 2019-10-24 CN CN201911018240.3A patent/CN112709571A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915098A (en) * | 2010-07-14 | 2010-12-15 | 中国矿业大学 | Method for preventing and controlling rock burst through hydraulic cutting |
| CN102121394A (en) * | 2010-12-17 | 2011-07-13 | 神华集团有限责任公司 | Method for uncovering outburst coal seam by using pseudo lithosphere on laneway |
| US20140117739A1 (en) * | 2011-06-24 | 2014-05-01 | Ian Gray | Mining Method for Gassy and Low Permeability Coal Seams |
| CN102383728A (en) * | 2011-09-12 | 2012-03-21 | 山东科技大学 | Coal mine rockburst defect segmentation and control method |
| CN103726872A (en) * | 2013-12-30 | 2014-04-16 | 北京科技大学 | Oriented danger removing method for high mine pressure roadway of coal mine |
| CN104832198A (en) * | 2015-03-13 | 2015-08-12 | 中煤科工集团重庆研究院有限公司 | Roadway surrounding rock deformation, rock burst and coal and gas outburst comprehensive treatment method |
| WO2017096674A1 (en) * | 2015-12-11 | 2017-06-15 | 大同煤矿集团有限责任公司 | An above ground and underground cooperative control method of far and near field roofs of extra-large stoping space |
| CN107956505A (en) * | 2017-10-18 | 2018-04-24 | 西安交通大学 | Coal mine down-hole drilling anti-reflection method based on controllable shock wave technology |
| CN108756881A (en) * | 2018-05-24 | 2018-11-06 | 淮海工学院 | A kind of bump preventing control method in solid coal column pressure coal region |
| CN109268047A (en) * | 2018-11-01 | 2019-01-25 | 天地科技股份有限公司 | Laminated structure and method are unloaded in a kind of supporting in bump tunnel |
| CN110306984A (en) * | 2019-07-08 | 2019-10-08 | 辽宁工程技术大学 | A kind of baseboard of coal mine roadway type Controlling of Coal Outburst method |
Non-Patent Citations (1)
| Title |
|---|
| 吕有厂: "突出煤层掘进巷道冲击地压防治技术", 《煤炭科学技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117387557A (en) * | 2023-12-08 | 2024-01-12 | 中国云南路建集团股份公司 | Highway construction quality detection device |
| CN117387557B (en) * | 2023-12-08 | 2024-03-12 | 中国云南路建集团股份公司 | Highway construction quality detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ye et al. | Study on hydraulic-controlled blasting technology for pressure relief and permeability improvement in a deep hole | |
| CN101644156B (en) | Method for weakening coal-rock mass by hydraulic blasting and fracturing | |
| Hu et al. | Numerical and experimental investigation of blasting damage control of a high rock slope in a deep valley | |
| Huang et al. | Hydraulic fracturing after water pressure control blasting for increased fracturing | |
| CN111396049A (en) | Safe and environment-friendly rock blasting device and method | |
| CN101440704A (en) | Ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method and specific high-energy gas generator | |
| CN108999596B (en) | Method for gas explosion fracturing of coal rock mass by supercritical CO2 point-type jet flow | |
| CN104296609B (en) | Containing the controlled blasting method of different hardness rock stratum in Deep hole bench balsting | |
| Zhang et al. | Study on “fracturing-sealing” integration technology based on high-energy gas fracturing in single seam with high gas and low air permeability | |
| CN108204775B (en) | A kind of deep-lying tunnel instant type rock burst active preventing control method | |
| CN112709571A (en) | Coal mine tunnel rock burst prevention and control method based on controllable shock wave pre-splitting pressure relief | |
| Zhu et al. | The shaped blasting experimental study on damage and crack evolution of high stress coal seam | |
| CN105275435A (en) | Accurate time-delay presplitting blasting reinforcement coal seam gas extraction method | |
| CN103791786A (en) | Underground diaphragm wall bed rock grooving pre-splitting blasting method | |
| Jiang | Study of pre-split blasting using fracture mechanics | |
| CN204007361U (en) | A kind of mine blasting vibration damping retaining wall charge constitution | |
| CN108195242B (en) | Rock blasting method | |
| CN109870083A (en) | A kind of method of coal and rock orientation long range anatonosis | |
| Miao et al. | Numerical modelling of destress blasting–a state-of-the-art review | |
| CN112709573B (en) | Method for preventing and controlling rock burst of hard coal face based on controllable shock wave presplitting | |
| Wang et al. | Study on blasting technology for open-pit layering of complex mine adjacent to high and steep slope | |
| CN112709575A (en) | Hard thick coal seam top coal caving method based on controllable shock wave pre-splitting | |
| Zhang et al. | A study of millisecond blasting on high bench at barun iron ore operation | |
| CN114165209B (en) | Method for constructing complex seam network of coal seam step by step | |
| Xiang-Long et al. | EXPERIMENTAL RESEARCH ON PRESPLITTING BLASTING OF THE FINAL HIGHWALL OF AN OPENCAST COAL MINE. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |