CN113756807A - Coal face fault rock mass crushing method based on directional drilling technology - Google Patents
Coal face fault rock mass crushing method based on directional drilling technology Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 139
- 239000003245 coal Substances 0.000 title claims abstract description 104
- 239000011435 rock Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- 238000005422 blasting Methods 0.000 claims abstract description 51
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 238000005065 mining Methods 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 13
- 239000002360 explosive Substances 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 6
- 230000005641 tunneling Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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Abstract
The invention discloses a coal face fault rock mass crushing method based on a directional drilling technology. The invention adopts the directional drilling technology to realize the remote crushing of the hard rock mass of the lower bottom plate of the fault of the mine coal face, purposefully extends the hard rock mass along the trend of the lower bottom plate of the fault by artificially controlling the drilling track, thereby realizing the maximization of the crushing effect of the hard rock mass of the fault, selecting the position which does not influence the normal recovery of the coal face to carry out the directional drilling and the remote blasting crushing, ensuring the normal production and the equipment safety of the coal face, and utilizing the directional drilling hole to carry out the remote accurate crushing on the hard rock mass of the lower bottom plate of the fault of the coal face, thereby reducing the construction workload, shortening the construction period, reducing the construction cost and being more economical and applicable.
Description
Technical Field
The invention relates to the technical field of underground coal mining of coal mines, in particular to a method for breaking a fault rock mass of a coal mining working face based on a directional drilling technology.
Background
With the improvement of coal mining technology and the application of modern coal mining equipment, comprehensive mining gradually becomes a main mode in the coal mining process in China. The continuous increase of the mining depth enables the geological condition of the coal face to be more complex, the coal seam capable of being mined often meets the fault geological structure, the ordered advance of the coal mining work is seriously influenced, and the potential safety hazard is left. In order to solve the problems, various methods for enabling the fully mechanized coal mining face to pass through the fault exist at present, such as adjusting coal cutting height, lifting top and bottom, moving and jumping mining, and the like. When the fault drop is small, the coal mining machine is often forced to pass through the fault by breaking coal directly, but the cutter is likely to be damaged to a great extent. When the fault structure is complex, the coal mining machine cannot pass through the fault structure directly, a 'moving' method is often adopted, the coal face is frequently changed, and the development and maintenance cost of the roadway can be greatly increased.
When the fault distance is large and the top and bottom rock layers are hard rocks, if mining is not to be abandoned and a cut hole is cut, the rock mass of the fault face needs to be blasted.
The mode of tradition fault face rock mass blasting does: after the coal cutter recovers and exposes the fault rock mass, conventional drilling holes are constructed in front of the coal cutter on the coal face to charge the coal so as to blast the fault rock mass, a plurality of drilling holes need to be constructed on the coal face in the mode, construction workload is large, drilling construction needs to be carried out under a hydraulic support in front of the coal cutter, and safety of recovery equipment and coal mining progress are seriously affected.
In addition, the invention patent CN110186340A discloses a method for smoothly propelling a fully mechanized mining face when encountering a fault, which adopts a method of firstly tunneling a presplitting blasting working lane and then performing regional presplitting blasting on hard rock in the lane, and overcomes the problems of influencing the safety of mining equipment and the coal mining working progress existing in the traditional fault face rock blasting, but the construction workload is large, the construction period is long, the construction cost is high, and the economic applicability is poorer.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a coal face fault rock mass crushing method based on a directional drilling technology.
The invention provides a coal face fault rock mass crushing method based on a directional drilling technology, which comprises the following steps:
determining a coal face fault-crossing route, namely determining a route of the coal face through a fault footwall hard rock mass according to a fixed fault structure position and a coal face stoping technical scheme;
determining a directional drilling route, namely determining a drilling route for penetrating a coal seam from a return airway of the coal face and extending the strike of the fault layer to penetrate through the hard rock mass of the fault footwall on the route of the coal face according to the strike of the fault and the route of the coal face passing through the hard rock mass of the fault footwall of the fault;
a directional drilling field tunneling step, namely selecting a position of a return airway of the coal face, which does not influence the normal recovery of the coal face, as an initial position of a directional drilling route, and tunneling the directional drilling field at the initial position;
a directional drilling step, wherein a directional drilling rig drills along a designed directional drilling route by taking a directional drilling field as a construction site to form a drilling hole which sequentially penetrates through the coal seam and the hard rock mass of the fault footwall;
and a blasting step, namely, loading the blasting device into a drilling hole of the hard rock mass of the lower plate bottom plate of the fault, then filling stemming for hole sealing, and then detonating the blasting device to finish blasting the hard rock mass of the lower plate bottom plate of the fault on the coal face line.
Further, the directional drilling step is preceded by a hole opening step, holes are formed in the coal seam of the directional drilling field according to the directional drilling route design, the hole opening direction points to the fault trend, and the inclination angle of the holes is the same as the inclination of the coal face.
Further, in the step of drilling, a phi 98mmPDC drill bit, a straight-keeping centralizer and a full-hole drill bit are adopted for straight-keeping drilling, the footage is not less than 15m, and then the phi 98/153mmPDC drill bit is replaced for reaming drilling until the footage is not less than 15 m.
And further, after the hole is opened, a geological hole sealing pipe with a gate valve is put into the hole, and then hole sealing materials are injected between the geological hole sealing pipe and the hole wall for sealing the hole.
Furthermore, in the directional drilling step, after directional drilling is started, strictly following a designed directional drilling route, carrying out parameter measurement on the hole bottom every 3m, obtaining a complete drilling track by using each measuring point through a calculation method of replacing a chord arc, and adjusting the drilling direction by using a screw motor of the directional drilling machine to extend the drilling hole according to the designed directional drilling route, namely adjusting the directional drilling track to extend the running direction of the breaking layer and drilling through the hard rock mass of the bottom plate of the lower tray of the fault.
Further, the blasting device and the stemming are fed into the drill hole through a drill rod of the directional drilling machine.
Furthermore, the blasting device comprises an outer sleeve and explosive filled in the outer sleeve, two ends of the outer sleeve are respectively plugged by plugs, when the blasting device and the stemming are loaded, the blasting device is firstly inserted into a drill hole, after the blasting device is completely inserted into the drill hole, a connecting sleeve is arranged on a drill rod of the directional drilling machine, the connecting sleeve is sleeved with the outer sleeve of the blasting device, the pipe walls of the connecting sleeve and the outer sleeve are fixed together by a shearing pin, then the blasting device is sent to the drill hole bottom of the hard rock body of the fault bottom plate by the drill rod of the directional drilling machine, after the blasting device is in place, one end of the drill rod extending out of the drill hole is connected with the stemming machine, the stemming is pressed into the drill hole by the drill rod, in the process of pressing the stemming, the shearing pin is sheared, the connecting sleeve is separated from the outer sleeve, the drill rod is dragged outwards by the directional drilling machine, and pressing stemming into the drill hole through a stemming machine, and filling the stemming into the drill hole.
The invention has the beneficial effects that:
before the coal face is pushed to the fault, a directional drilling field is opened up in advance in a return airway of the coal face, a directional drilling machine is adopted to directionally drill the hard rock mass of the lower plate of the fault, the drilling track is manually controlled, the target centering of the hard rock mass of the lower plate of the extension layer is completed in a long distance in an open hole area which does not affect the mining of the coal face, the directional drilling track extends in the trend of the hard rock mass of the lower plate of the fault, then a detonator and an explosive are put into the drilling hole and filled with stemming, and finally the blasting is carried out by utilizing a conducting wire, so that the hard rock mass crushing of the lower plate of the fault is completed.
The directional drilling section in the hard rock mass of the lower plate of the fault is used for implementing remote directional blasting to break the rock mass, and a follow-up coal mining machine smoothly passes through the large-fault-distance hard rock mass fault of the section, so that the phenomena of cutter damage and production lag do not occur, and the safe production of a mine is guaranteed.
Compared with the prior art, the application has at least the following advantages compared with the prior art:
(1) the hard rock mass of the lower wall bottom plate of the fault of the mine coal face is crushed in a long distance by adopting a directional drilling technology;
(2) by utilizing directional drilling and manually controlling a drilling track, the drilling track is purposefully extended along the trend of the hard rock body of the lower plate of the fault, so that the crushing effect of the hard rock body of the fault is maximized;
(3) by utilizing directional drilling, the normal stoping position of the coal face is not influenced, and the directional drilling and the remote blasting crushing work are carried out, so that the normal production and equipment safety of the coal face can be ensured.
(4) By utilizing directional drilling, the hard rock mass of the lower bottom plate of the fault of the coal face is crushed remotely and accurately, so that the construction workload is reduced, the construction period is shortened, the construction cost is reduced, and the method is more economical and applicable.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic plan view of a directional borehole for breaking a fault rock mass at a mine coal face in an embodiment of the invention;
FIG. 2 is a schematic vertical sectional view of a directional borehole for breaking a fault rock mass at a mine coal face in an embodiment of the invention;
FIG. 3 is a schematic diagram of a fault structure of a mine coal face, a planned fault path of the coal face and blasting fractured rock mass in one embodiment of the invention;
FIG. 4 is a schematic view of another embodiment of the present invention as installed in a borehole;
fig. 5 is a schematic view when stemming is charged in another embodiment of the present invention.
In the drawings, 100-coal face; 200-hard rock mass of a lower wall bottom plate of a fault; 210-coal face fault-crossing route; 300-coal face return airway; 400-directional drilling field; 500-coal seam; 600-drilling; 610-geological hole sealing pipe; 700-a blasting device; 710-outer sleeve; 720-explosive; 730-a stopper; 740-connecting sleeves; 750-shear pins; 800-stemming; 900-drill rod.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely used to more clearly illustrate the technical solutions of the present embodiments, and therefore, the following embodiments are only used as examples, and the protection scope of the present embodiments is not limited thereby.
Example 1
As shown in fig. 1-3, an embodiment of the present invention provides a method for breaking a faulted rock mass of a coal face based on a directional drilling technology, which includes the following steps:
and a step of determining a coal face fault crossing route 210, wherein the route of the coal face 100 passing through the fault footwall hard rock mass 200 is determined according to the fixed fault structure position and the coal face mining technical scheme.
And a directional drilling route determining step, wherein a drilling 600 route which penetrates into the coal seam 500 from the coal face return airway 300 and then extends the fault layer to penetrate through the fault footwall hard rock 200 on the route of the coal face 100 is determined according to the trend of the fault and the route of the coal face 100 passing through the fault footwall hard rock 200.
And a step of tunneling the directional drilling site 400, wherein a position where normal stoping of the coal face 100 is not affected at one position of the return airway 300 of the coal face is selected as an initial position of the route of the directional drilling hole 600, and the directional drilling site 400 is tunneled at the initial position.
And a hole opening step, wherein holes are formed in the coal seam 500 of the directional drilling field 400 according to the directional drilling 600 route design, the hole opening direction points to the fault trend, the inclination angle of the holes is the same as the inclination of the coal face 100, and therefore the track direction of the directional drilling 600 with the shortest distance is adjusted to the direction extension of the fault.
Specifically, in the hole opening step, a phi 98mmPDC drill bit, a straightening centralizer and a full-hole drill bit are adopted to perform straightening drilling, the footage is not less than 15m, and then the phi 98/153mmPDC drill bit is replaced to perform reaming drilling until the footage is not less than 15 m.
After the hole is opened, a geological hole sealing pipe 610 with a gate valve is put in, then hole sealing materials are injected between the geological hole sealing pipe 610 and the hole wall for sealing, and directional drilling is started after the hole sealing materials are solidified.
And (2) directional drilling 600, wherein the directional drilling machine takes a directional drilling field 400 as a construction field, drills along a designed directional drilling 600 route, and forms a drilling 600 which sequentially penetrates through the coal seam 500 and the hard rock body 200 of the bottom plate of the fault footwall.
Specifically, in the directional drilling step, after directional drilling is started, the designed directional drilling 600 route is strictly followed, parameter measurement is performed on the hole bottom every 3m, a complete drilling 600 track is obtained by using a calculation method that all measuring points are used for replacing arcs with chords, the drilling direction is adjusted by using a screw motor of the directional drilling machine, so that the drilling 600 extends according to the designed directional drilling 600 route, namely the directional drilling 600 track is adjusted to extend towards the extension of the extension layer, and the drilling penetrates through the hard rock mass 200 of the fault footwall.
And a blasting step, namely, loading the blasting device 700 into the drill hole 600 of the hard rock body 200 of the bottom plate of the lower fault tray, then filling stemming 800 for hole sealing, and then detonating the blasting device 700 to finish blasting the hard rock body 200 of the bottom plate of the lower fault tray on the path of the coal face 100.
Before the coal face 100 is pushed to a fault, a directional drilling field 400 is opened up in advance in a return airway 300 of the coal face, a directional drilling machine is adopted to directionally drill a hole 600 in the hard rock mass 200 of the lower plate of the fault, the track of the hole 600 is artificially controlled, the middle target of the hard rock mass 200 of the lower plate of the extension layer is remotely completed in an opening area which does not affect the recovery of the coal face 100, the track of the directional drilling hole 600 extends in the direction of the hard rock mass 200 of the lower plate of the fault, then a detonator and an explosive 720 are put into the hole 600 and filled with stemming 800, and finally, a conducting wire is used for detonation, so that the hard rock mass 200 of the lower plate of the fault is broken.
The directional drilling 600 section in the hard rock mass 200 of the lower plate bottom plate of the fault is used for implementing remote directional blasting to break the rock mass, and a follow-up coal mining machine smoothly passes through the large-fault-distance hard rock mass fault of the section, so that the phenomena of cutter damage and production hysteresis are not generated, and the safe production of a mine is guaranteed.
Compared with the prior art, the application has at least the following advantages compared with the prior art:
(1) the hard rock mass 200 of the footwall bottom plate of the 100 fault of the mine coal face is crushed in a long distance by adopting a directional drilling technology;
(2) by utilizing the directional drilling 600 and manually controlling the track of the drilling 600, the drilling 600 purposefully extends along the trend of the fault footwall bottom plate hard rock body 200, thereby realizing the maximization of the fracture hard rock body crushing effect;
(3) by utilizing the directional drilling 600, the drilling of the directional drilling 600 and the remote blasting crushing work are carried out at the position which does not influence the normal stoping of the coal face 100, so that the normal production and equipment safety of the coal face 100 can be ensured.
(4) By utilizing the directional drilling 600, the hard rock mass 200 of the footwall bottom plate of the fault of the coal face 100 is crushed remotely and accurately, so that the construction workload is reduced, the construction period is shortened, the construction cost is reduced, and the method is more economical and applicable.
Example 2
The invention provides a coal face fault rock mass crushing method based on the directional drilling technology, and the embodiment is further optimized to the embodiment 1.
In the embodiment 2, as shown in fig. 4 and 5, the blasting device 700 comprises an outer casing 710 and explosives 720 filled in the outer casing 710, both ends of the outer casing 710 are respectively sealed by plugs 730, so that the explosives 720 can be prevented from being affected by moisture, when the blasting device 700 and the stemming 800 are loaded, as shown in fig. 4, the blasting device 700 is firstly inserted into a drill hole 600, after the blasting device 700 is completely inserted into the drill hole 600, a connecting sleeve 740 is installed on a drill stem 900 of a directional drilling machine, the connecting sleeve 740 is sleeved with the outer casing 710 of the blasting device 700, the connecting sleeve 740 and the pipe wall of the outer casing 710 are fixed together by a shear pin 750, then the blasting device 700 is sent to the bottom of the drill hole 600 of the hard rock mass 200 of the bottom plate of the fault bed by the drill stem 900 of the directional drilling machine, as shown in fig. 5, after the blasting device 700 is in place, one end of the drill stem 900 extending out of the drill hole 600 is connected with a stemming machine (not shown in the figure), the stemming machine presses the stemming 800 into the drill hole 600 through the drill stem 900, the shearing pin 750 is sheared during the pressing process of the stemming 800, the connecting sleeve 740 is separated from the outer sleeve 710, after the connecting sleeve 740 is separated from the outer sleeve 710, the drill stem 900 is dragged outwards through the directional drilling machine, the stemming 800 is pressed into the drill hole 600 through the stemming machine, and the stemming 800 is filled into the drill hole 600.
The blasting device 700 and the stemming 800 are filled in the mode, after the outer sleeve 710 of the blasting device 700 is jacked in place by the drill rod 900, the stemming 800 is directly pressed into the drill rod 900 through the stemming machine, the pressure in the drill rod 900 is increased, the shearing pin 750 is sheared, the drill rod 900 is automatically separated from the outer sleeve 710 of the blasting device 700, then the stemming 800 is continuously pressed in, the drill rod 900 is slowly dragged outwards, and further the stemming 800 is filled in the drill hole 600, the filling process of the whole blasting device 700 and the stemming 800 is completed at one go, the drill rod 900 does not need to be withdrawn midway, and the operation efficiency is greatly improved.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present embodiment, and not for limiting the same; although the present embodiment has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solutions of the embodiments of the present embodiment, and all of them should be covered in the claims and the specification of the present embodiment.
Claims (7)
1. A coal face fault rock mass crushing method based on directional drilling technology is characterized by comprising the following steps:
determining a coal face fault-crossing route, namely determining a route of the coal face through a fault footwall hard rock mass according to a fixed fault structure position and a coal face stoping technical scheme;
determining a directional drilling route, namely determining a drilling route for penetrating a coal seam from a return airway of the coal face and extending the strike of the fault layer to penetrate through the hard rock mass of the fault footwall on the route of the coal face according to the strike of the fault and the route of the coal face passing through the hard rock mass of the fault footwall of the fault;
a directional drilling field tunneling step, namely selecting a position of a return airway of the coal face, which does not influence the normal recovery of the coal face, as an initial position of a directional drilling route, and tunneling the directional drilling field at the initial position;
a directional drilling step, wherein a directional drilling rig drills along a designed directional drilling route by taking a directional drilling field as a construction site to form a drilling hole which sequentially penetrates through the coal seam and the hard rock mass of the fault footwall;
and a blasting step, namely, loading the blasting device into a drilling hole of the hard rock mass of the lower plate bottom plate of the fault, then filling stemming for hole sealing, and then detonating the blasting device to finish blasting the hard rock mass of the lower plate bottom plate of the fault on the coal face line.
2. The method for breaking the faulted rock mass of the coal face based on the directional drilling technology is characterized by further comprising a hole opening step before the directional drilling step, wherein holes are formed in the coal seam of the directional drilling field according to the design of the directional drilling route, the direction of the holes is directed towards the trend of the faults, and the inclination angle of the holes is the same as the inclination angle of the coal face.
3. The method for breaking the faulted rock mass of the coal face based on the directional drilling technology as claimed in claim 2, wherein in the step of drilling, a phi 98mm PDC drill bit, a straightening centralizer and a full-hole drill bit are used for straightening drilling, the footage is not less than 15m, and then a phi 98/153mm PDC drill bit is replaced for reaming drilling until the footage is not less than 15 m.
4. The method for breaking the faulted rock mass of the coal face based on the directional drilling technology as claimed in claim 2 or 3, wherein after the hole is opened, a geological hole sealing pipe with a gate valve is put into the hole, and then hole sealing materials are injected between the geological hole sealing pipe and the hole wall for sealing the hole.
5. The method for breaking the faulted rock mass of the coal mining working face based on the directional drilling technology as claimed in claim 1, wherein in the directional drilling step, after the directional drilling is started, the designed directional drilling route is strictly followed, the parameter measurement is carried out on the hole bottom every 3m, the complete drilling track is obtained by using a calculation method that all measuring points replace arcs by chords, the drilling direction is adjusted by using a screw motor of a directional drilling machine, so that the drilling hole extends according to the designed directional drilling route, namely the directional drilling track is adjusted to extend along the trend of the breaking layer and penetrates through the hard rock mass of the bottom plate of the lower fault tray.
6. The method for breaking up the faulted rock mass of the coal face based on the directional drilling technology is characterized in that the blasting device and the stemming are sent into a drill hole through a drill rod of a directional drilling machine.
7. The method for breaking the faulted rock mass of the coal face based on the directional drilling technology as claimed in claim 6, wherein the blasting device comprises an outer sleeve and explosives filled in the outer sleeve, two ends of the outer sleeve are respectively plugged by plugs, when the blasting device and stemming are loaded, the blasting device is firstly inserted into the drill hole, after the blasting device is completely inserted into the drill hole, a connecting sleeve is arranged on a drill rod of the directional drilling machine, the connecting sleeve is sleeved with the outer sleeve of the blasting device, the pipe walls of the connecting sleeve and the outer sleeve are fixed together through a shearing pin, then the blasting device is sent to the drill hole bottom of the hard rock mass of the bottom plate of the faulted lower plate through the drill rod of the directional drilling machine, after the blasting device is in place, one end of the drill rod extending out of the drill hole is connected with a stemming machine, the stemming is pressed into the drill hole through the drill rod, and the shearing pin is sheared during the pressing of the stemming, the connecting sleeve is separated from the outer sleeve, the drill rod is dragged outwards through the directional drilling machine while stemming is pressed into the drill hole through the stemming machine after the connecting sleeve is separated from the outer sleeve, and then the stemming is filled in the drill hole.
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| CN202110890914.XA CN113756807A (en) | 2021-08-04 | 2021-08-04 | Coal face fault rock mass crushing method based on directional drilling technology |
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| CN202110890914.XA CN113756807A (en) | 2021-08-04 | 2021-08-04 | Coal face fault rock mass crushing method based on directional drilling technology |
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| CN110186340A (en) * | 2019-06-28 | 2019-08-30 | 山东新巨龙能源有限责任公司 | Fully-mechanized mining working meets the method to make smooth advances when tomography |
| CN112179227A (en) * | 2020-10-10 | 2021-01-05 | 河南理工大学 | Coal face ultra-deep hole blasting roof cutting pressure relief control method and blasting charge structure |
| CN112253113A (en) * | 2020-09-10 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for weakening hard gangue layer by coal mine underground directional long drilling and staged hydraulic fracturing |
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2021
- 2021-08-04 CN CN202110890914.XA patent/CN113756807A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2138639C1 (en) * | 1998-03-30 | 1999-09-27 | Кулаков Юрий Николаевич | Method for development of thick steep-dipping coal seams |
| CN106837333A (en) * | 2017-01-17 | 2017-06-13 | 济宁矿业集团有限公司霄云煤矿 | A kind of fully-mechanized mining working pre-tunnel laneway road formula passing fault method |
| CN107816353A (en) * | 2017-11-06 | 2018-03-20 | 山东科技大学 | A kind of excessive drop tomography new method of fully-mechanized mining working |
| CN108104815A (en) * | 2017-12-27 | 2018-06-01 | 孟思思 | Huge thickness hard coal seam unloading pressure by blasting draws out methane Sub-Level Caving coal-mining method |
| CN110186340A (en) * | 2019-06-28 | 2019-08-30 | 山东新巨龙能源有限责任公司 | Fully-mechanized mining working meets the method to make smooth advances when tomography |
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