CN104234749A - Surrounding rock control method for large-section dismantling tunnel of fully-mechanized mining face - Google Patents
Surrounding rock control method for large-section dismantling tunnel of fully-mechanized mining face Download PDFInfo
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Abstract
The invention relates to the technical field of fast moving of ultra-large mining height (greater than or equal to 5m) fully-mechanized mining faces of coal mines, and provides a surrounding rock control method for a large-section dismantling tunnel of a fully-mechanized mining face. The method comprises the following steps of performing driving from a roof of a coal seam along a stop line to form a tunnel communicated with gate roads on the two sides of the mining face, and performing supporting; driving a plurality of coal rooms to form roof control coal pillars on the side, close to the mining face, of the tunnel, and performing supporting, performing downward bottom extension on the tunnel along the stop line to form a part of section of the dismantling tunnel, supporting the two sides of a brush expansion part, and hardening a bottom plate; pushing the mining face ahead, and cutting the remaining coal pillars between the current mining face and the stop line to form the dismantling tunnel of the fully-mechanized mining face. According to the method, bottom coal for side protection and the coal pillars for roof control are reserved, so that a chock support and other temporary supports, which are required to be arranged when a conventional mining face is communicated with the dismantling tunnel, are removed, heavy equipment for an ultra-large mining height (greater than or equal to 5m) fully-mechanized mining face is safely and reliably dismantled, the dismantling cost is greatly lowered, and reliable guarantee is provided for the rapid moving of the mining face.
Description
Technical field
The present invention relates to coal mine fully-mechanized mining working Fast moving technique of working field, particularly relate to a kind of super great mining height (>=5m) fully-mechanized mining working big cross section return channel surrounding rock control method.
Background technology
At present, special thick (>=5m) coal seam is main force's working seam that China realizes high-yield and high-efficiency, and super high seam production technique level decides the scientific and technological progress of Coal Industrial and the lifting of overall strength.As everyone knows, the Quick-return of fully-mechanized mining working is not only the important step that mine realizes safety in production, and directly governs the raising of fully-mechanized mining working unit yield; Wherein, the basis realizing fully-mechanized mining working Quick-return is the surrounding rock control method of big cross section return channel.
In prior art, the control of domestic and international fully-mechanized mining working return channel mainly contains Three models:
-kind be utilize coal-winning machine as heading equipment, its Major Systems and technique are:
(1) formation of conventional removal of home return channel
Stope is adopted to stopping adopting line place, and hydraulic support stops reach, and working surface coal mining machine and scratch board conveyor continue propelling 4 ~ 6 circulation, thus formation withdraws space, and is formed with material crossheading and withdraw system;
(2) conventional removal of home work plane ending
Push to adopt at fully-mechanized mining working and hang monolayer net to apart from stopping adopting line 22m place, 8 ~ 10m hangs Double-level Reticulated; Withdraw in space and set anchor pole, anchor pole 4 ~ 6 arrangement is put, array pitch 0.75 × 0.875m, simultaneously on set cap, add outrigger strengthening supporting, finally clear up float coal;
The method withdraws in the process in space in formation, the connection between support and drag conveyor is needed to unsnap, come and go coal cutting by coal-winning machine and bolt support is carried out to top board simultaneously, because coal side is highly large, easily wall caving is there is when roof timbering, the risk factor of construction is larger, and passage construction speed is slow, is unfavorable for the Quick-return of work plane.
Another kind is the two return channel of pre-pick, and tunnel special installation and return channel and working face extraction space and form removal of home system, removal of home equipment is special equipment, and its Major Systems and technique are:
(1) formation of two return channel
Stop adopting while line place digs two crossheadings at stope, excavate the accessory channel that two are parallel to stope tendency, passage by work plane side is called return channel, another passage is called and withdraws auxiliary lane, between two passes, dig 4 ~ 6 connection roadways, form auxiliary lane multichannel removal of home roadways layout; The return channel connected with stope takes bolting with wire mesh.Return channel is also equipped with hydraulic prop, mining i beam, hydraulic chock; Withdraw auxiliary lane and adopt bolt support, connection roadway adopts anchor pole and single-layer metal net combined supporting.Withdraw auxiliary lane and the connection roadway that withdraw support all adopt concrete to solidify base plate.
(2) double back removes channels operation face ending
Push to adopt to distance return channel 16m place at fully-mechanized mining working, start to hang high-strength polyester fibers net or wire lath, 4m ~ 0.8m starts to hang wire rope, twice wire rope interval 800mm, need hang wire rope 5 road altogether.Carry out after through networking and outrigger, finally clear up float coal; The through rear work plane strata behaviors of work plane tunneling boring is very violent, and usually occur large area to press, work plane need take reinforce support, and work plane return channel reinforce support generally adopts to be lifted canopy and add brettis support pattern.
Binary channels moving technique of working, excavates return channel in advance, expands removal of home space, realizes formation and the working face extraction parallel operations of return channel; But because return channel section is large, passage supporting expense is large, and need a large amount of individual prop iron canopy and brettis to carry out advance support, supporting has high input, and adds the transport amount withdrawing period.
Due to the aggravation of coal market competition, the reduction of coal mining enterprise to face moving or the economic loss and resource recovery that withdraw generation is more and more paid attention to, and particularly seeming in high working face, heavy equipment, high-productivity faces is even more important.Therefore new requirement is proposed to face moving technology, under certain moving time prerequisite, reduce removal cost and use.
The third digs single channel removal of home mode in advance, and its Major Systems and technique are:
(1) stop adopting line place at fully-mechanized mining working and tunnel a rectangular cross section return channel perpendicular to work plane two crossheading, form single channel return channel arrangement system, and supporting is carried out to return channel; (2) as the advanced return channel 38m ~ 42m of fully-mechanized mining working, by fully-mechanized mining working oblique adjusting, fully-mechanized mining working and return channel angle is made to be 6 ° ~ 8 °; As the advanced return channel 8m ~ 12m of fully-mechanized mining working, complete oblique adjusting work, carry out the through piecemeal of fully-mechanized mining working and return channel, specific practice is that 6 ~ 7 frame hydraulic supports that often circulated are through, and control top area is 55m
2~ 62m
2; (3), during fully-mechanized mining working ending, hydraulic support top beam is laid wire lath and half round timber; Fully-mechanized mining working and return channel through after, each hydraulic support arranges slotting beam, and insert beam one end and prop up and be located on the back timber of hydraulic support, the other end props up and is located on the individual prop of return channel; (4) after fully-mechanized mining working and return channel are comprehensively through, form working face equipment and withdraw space.
Which withdraws space formation method relative to tradition and has speed soon, has reduction equipment handover charge, reduce the advantage of loss of coal pillar relative to two return channel method.But need to carry out oblique adjusting to work plane during adopting at work plane end, and work plane and return channel are through piecemeal, speed of application is slower; The advance support of return channel adopts hydraulic prop to carry out reinforcement, individual prop less stable; Pre-pick return channel section is little, is unfavorable for withdrawing from of super great mining height fully-mechanized mining working jumbo.
In view of this, need badly and a kind of super great mining height fully-mechanized mining working return channel surrounding rock control method is provided, to overcome the defect that existing return channel control method exists separately.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is that solution existing super great mining height (>=5m) fully-mechanized mining working big cross section return channel maintenance cost is high, the problem of Surrounding Rock Control weak effect.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of return channel surrounding rock control method of fully-mechanized mining working, described method comprises the steps:
A. along stopping adopting line, forming the passage of through work plane both sides crossheading from roof driving, forming the Part I section of return channel, and carry out supporting;
B. a gang of near work plane at described passage, the length direction along described passage tunnels multiple bordroom, forms control top coal column, and carries out supporting to bordroom top board and control top coal column;
C. along stopping adopting line, described passage being pulled down end expansion, forming active face portion return channel, and help to carry out supporting to brush expansion part two, channel base plate is hardened;
D. work plane is pushed ahead, cut work at present face to described in stop the remainder coal column adopted between line, make work plane and described passage through, formation fully-mechanized mining working return channel.
Preferably, in steps d, when the advance of the face enters described bordroom preset distance to support, stop moving frame, utilize pushing and sliding jack moving conveyor and coal-winning machine, described remainder coal column is cut.
Preferably, in step a, described passage and work plane are arranged in parallel.
Preferably, in step b, the angle of the tunneling direction of described bordroom and the length direction of described passage is 30 ° ~ 60 °.
Preferably, in step a, be permanent support to the top board of described passage and the supporting that stops the lateral wall adopting line side thereof.
Preferably, in step b, be permanent support to the supporting of the top board of described bordroom, top anchor cable or the anchor pole of contiguous described work plane are obliquely extended to above working face wall, the top anchor cable of control top, contiguous both sides coal column or anchor pole are obliquely extended to the top of corresponding described control top coal column, and the described anchor cable of each described control coal column both sides or anchor pole oblique above it.
Preferably, in step b, the pre support carried out top board above described bordroom top board and control top coal column is permanent support.
Preferably, in steps d, between coal-winning machine cut work plane and described passage coal column process in without the need to carrying out interim passive protecting to described passage.
Preferably, in step a, the driving width of described passage is 3m ~ 4m, is highly 2m ~ 2.5m; In step b, the Excavation Length of described bordroom is 4m ~ 5m, and width is 3m ~ 4m, is highly 2m ~ 2.5m; In step c, pulling down the height that the end extends to described passage is 5m ~ 5.5m.
Preferably, in step a, the driving width of described passage is 3.5m, is highly 2.5m; In step b, the Excavation Length of described bordroom is 5m, and width is 4m, is highly 2.5m; In step c, pulling down the height that the end extends to described passage is 5.5m.
(3) beneficial effect
Technique scheme tool of the present invention has the following advantages:
First, push up coal column by wall supporting of keeping on file with control to combine, reduce lateral wall height, utilize lateral wall bordroom to carry out pre support to return channel top board simultaneously, the effective control to return channel top board is achieved by coal column and the supporting of top board anchor rete cord band, effectively can reduce driving expense and the supporting expense of passage, shorten return channel formation time, the maintenance safe of passage is better.
Secondly, the mode combined by lateral wall bordroom top board anchor rete cord band pre support and control top coal column, is effectively controlled the top board of return channel, eliminates traditional support forms such as individual prop, girder steel and hydraulic chock, reduce the expense of withdrawing.
Again, adopt Yu Jueji road and certainly adopt the return channel forming technique of passing and combining, both the return channel problem difficult in maintenance because a full advance brings had been avoided, utilize lateral wall bordroom to shift to an earlier date pre support to coal-winning machine from adopting passage portion simultaneously, solve the lower roof delamination problem produced of dynamic pressure impact, and effectively reduce driving and the supporting expense of passage.
Compared with prior art, the present invention proposes pre-pick and certainly adopt the return channel surrounding rock control method combined, be specially adapted to super great mining height (>=5m) work plane big cross section and withdraw logical Surrounding Rock Control, by coal wall supporting and the roof control by coal pillars of keeping on file, achieve super great mining height, the withdrawing from of jumbo safely and reliably, and greatly reduce and withdraw cost, move fast provide reliable guarantee for realizing work plane.
Accompanying drawing explanation
Fig. 1 is the flow chart of the return channel surrounding rock control method of fully-mechanized mining working described in the specific embodiment of the invention;
Fig. 2 is the plan structure figure of step S1 shown in Fig. 1;
Fig. 3 is the A-A sectional view of Fig. 2;
Fig. 4 is the plan structure figure of step S2 shown in Fig. 1;
Fig. 5 is the B-B sectional view of Fig. 4;
Fig. 6 is the C-C sectional view of Fig. 4;
Fig. 7 is the D-D sectional view of Fig. 4;
Fig. 8 is the sectional view of step S3 shown in Fig. 1, and its slice location is by control top coal column;
Fig. 9 passes through bordroom for the sectional view of step S3 shown in Fig. 1, its slice location.
In figure: fully-mechanized mining working 1, stop adopting line 2, roof 3, tunnel 4, passage 5, bordroom 6, control top coal column 7, ground coal post 8, brush expand part 9, protection pillar 10, working face wall 11.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
, rib poor stability long based on conventional moving technique of working return channel formation time, it is relatively narrow and small that single channel withdraws space, is unfavorable for withdrawing from of super great mining height, jumbo; And the removal of home of existing binary channels removal of home remove technology costly, have high input, shortcoming that loss of coal pillar is many, present embodiments provide for a kind of return channel surrounding rock control method of brand-new fully-mechanized mining working.It should be explicitly made clear at this point, after so-called " return channel " refers to that fully-mechanized mining working stops adopting, for guarantee working face equipment safety, smoothly withdraw and advance reservation withdraw space.Its Main Function guarantees to have when withdrawing working surface hydraulic support and coal-winning machine enough to withdraw space.
As shown in Figure 1, the return channel surrounding rock control method flow chart of fully-mechanized mining working described in the embodiment of the present invention.
The return channel surrounding rock control method of this fully-mechanized mining working, comprises the steps:
S1, along fully-mechanized mining working 1 stop adopt line 2, tunnel the passage 5 forming through work plane both sides crossheading 4 from roof 3, form the Part I section of return channel, and carry out supporting; Please also refer to Fig. 2 and Fig. 3.
Here, passage 5 is as the pre-pick region of return channel, and preferably, this passage 5 is arranged in parallel with fully-mechanized mining working, with the integrated planning operation of convenient down-hole.
S2, a gang of near work plane 1 at passage 5, the length direction along passage 5 tunnels multiple bordroom 6, and carries out supporting to bordroom top board and control top coal column; Please also refer to Fig. 4, Fig. 5, Fig. 6 and Fig. 7.
Driving based on bordroom 6 forms control top coal column 7 and ground coal post 8, that is, hole-througing in advance on the basis of 3 first, again tunnels.Setting like this, pushes up coal column 7 by coal wall supporting of keeping on file with control and combines, reduce lateral wall height, utilize lateral wall bordroom to carry out pre support to return channel top board simultaneously.After completing the driving of bordroom 6, permanent support is carried out to the top board of bordroom 6 and coal side, anchor pole and/or anchor cable can be adopted to complete corresponding supporting operation.
S3, edge stop adopting line, passage 5 are pulled down end expansion, make passage reach return channel design height, and concreting sclerosis base plate, form the partial cut-away of return channel; Be equivalent to third time pre-pick, and help to carry out supporting to brush expansion part two; Please also refer to Fig. 8, the slice location of this figure is identical with the slice location of 6, namely by control top coal column 7.Preferably, the supporting of anchor rete cord band is adopted.
S4, work plane are pushed ahead, the remainder coal column between cut work at present face to passage 5, make work plane and aforementioned channels through, form fully-mechanized mining working return channel, thus obtain the advantage withdrawn.As shown in Figure 8 and Figure 9, wherein, Fig. 8 is the sectional view (slice location can see the C-C in Fig. 4) by control top coal column, and Fig. 9 is by the sectional view of bordroom (slice location can see the D-D in Fig. 4).
It should be noted that, in step S4, when the advance of the face enters bordroom 6 preset distance to support, stop moving frame; Now, utilize pushing and sliding jack moving conveyor and coal-winning machine, to be cut by remainder coal column, complete the foundation of final return channel, between coal-winning machine cut work plane and described passage coal column process in without the need to carrying out interim passive protecting to described passage.Here, " preset distance " refers to that support stretches into the certain depth size of bordroom 6, and the difference according to different work equipment has difference, but not is restricted to specific dimensional depth.
Particularly, according to return channel rock stratum condition, carry out specific aim and determine supporting parameter.The following detailed description of concrete anchorage style involved in above-mentioned operation.
First, after step S1 completes pre-pick, be permanent support to the top board of passage 3 and the supporting that stops the lateral wall adopting line side thereof, and the contiguous top anchor cable stopping adopting line 2 is obliquely extended to above protection pillar 10, top board and the coal side of anchor pole, anchor cable, wire lath, this passage 5 of steel band combined supporting specifically can be adopted.Concrete as shown in Figure 3, the top board of passage 5 and and the lateral wall that stops adopting line side be provided with anchor pole a, its top board is provided with top anchor cable b, and itself and the lateral wall stopping adopting line side thereof are provided with side anchor cable c; Corresponding, the lateral wall of the nearly work plane side of passage 5 is provided with glass fibre reinforced plastics rockbolts d, forms temporary lining.
Next, after step S2 completes the driving of bordroom 6, need to carry out permanent support to the top board of bordroom 6, specifically can adopt top board and the both sides coal side of anchor pole, anchor cable, wire lath, this bordroom 6 of steel band combined supporting.As shown in Figure 6 and Figure 7, the top anchor cable b of contiguous work plane 1 is obliquely extended to above working face wall 11, as shown in Figure 5, the top anchor cable b of control top, contiguous both sides coal column 7 is obliquely extended to the top of corresponding control top coal column 7, and the anchor cable oblique above it of each control coal column 7 both sides.In addition, the coal side of the nearly work plane side of bordroom 6 is provided with glass fibre reinforced plastics rockbolts d, forms temporary lining.
Further, after step S3 completes down the expansion that undercuts, the supporting stopping the lateral wall adopting line 2 side of brush being expanded to part 9 is permanent support, and as shown in Figure 8 and Figure 9, this is roughly the same with the support form of this side lateral wall of passage in step S1 5; Similarly, need to be provided with glass fibre reinforced plastics rockbolts d on the lateral wall that brush expands ground coal post 8 side of part 9.
For the ease of carrying out the driving operation of bordroom 6, and the adaptability of tunneling construction machinery.Further as shown in Figure 4, in step S3, the angle σ of the tunneling direction of bordroom 6 and the length direction of passage 3 is 30 ° ~ 60 °, forms relevant sufficient operating space, greatly can improve the operability of tunneling construction thus.
In addition, in order to promote the security reliability of this method further, can be improved further for the supporting operation of step S3.Particularly, when carrying out supporting operation in bordroom 6, the position of the contiguous control top coal column 7 of each bordroom 6 both sides, the anchor cable 10 of its supporting is obliquely extended to the top of corresponding control top coal column 7, and the anchor cable oblique above it of each control coal column 7 both sides, form firm roof bolting, thus provide reliable safety guarantee for the through return channel of cutting part coal column of subsequent step S4.Certainly, the component setting up aforementioned oblique anchoring can be also anchor pole, as long as can meet the needs controlling the reliable anchoring of top board above coal column 7.
In addition, for super great mining height (>=5m) work plane big cross section return channel, feasible construction size is determined by theory calculate and field trial.Particularly, in step S1, the driving width W of passage 3 is 3m ~ 4m, and height h is 2m ~ 2.5m; The size of best excavated section is 3.5m × 2.5m.In step S2, the Excavation Length L of bordroom 6 is 4m ~ 5m, and width w is 3m ~ 4m, and height T is 2m ~ 2.5m; Optimum section size is 4.0m × 2.5m.In step S3, pulling down the height H that the end extends to passage 3 is 5m ~ 5.5m, reaches as high as 5.5m.
In sum, the present invention adopt pre-pick and oneself to adopt to combine without passive protecting return channel surrounding rock control method, be specially adapted to super great mining height (>=5m) work plane big cross section and withdraw logical Surrounding Rock Control.The present invention had both solved return channel full cross section excavation and had brought work plane and the through front difficulty safeguarded with through period of return channel, utilize lateral wall bordroom to carry out pre support in advance to top board (comprising above coal column) simultaneously, avoid coal-winning machine, when pick passage portion, the potential safety hazard that instant supporting brings is carried out to top board, by the roof control by coal pillars through reinforcing between lateral wall bordroom, avoid the sinking of work plane and return channel top board of through period, eliminate the passive protecting forms such as hydraulic chock, achieve the quick formation of return channel, achieve the achievement in research of novelty and significant benefit.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a surrounding rock control method for fully-mechanized mining working big cross section return channel, is characterized in that, described method comprises the steps:
A. along stopping adopting line, forming the passage of through work plane both sides crossheading from roof driving, forming the Part I section of return channel, and carry out supporting;
B. a gang of near work plane at described passage, the length direction along described passage tunnels multiple bordroom, forms control top coal column, and carries out supporting to bordroom top board and control top coal column;
C. along stopping adopting line, described passage being pulled down end expansion, forming active face portion return channel, and help to carry out supporting to brush expansion part two, channel base plate is hardened;
D. work plane is pushed ahead, cut work at present face to described in stop the remainder coal column adopted between line, make work plane and described passage through, formation fully-mechanized mining working return channel.
2. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 1, it is characterized in that, in steps d, when the advance of the face enters described bordroom preset distance to support, stop moving frame, utilize pushing and sliding jack moving conveyor and coal-winning machine, described remainder coal column is cut.
3. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 1 and 2, is characterized in that, in step a, described passage and work plane are arranged in parallel.
4. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 3, is characterized in that, in step b, the angle of the tunneling direction of described bordroom and the length direction of described passage is 30 ° ~ 60 °.
5. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 4, is characterized in that, in step a, is permanent support to the top board of described passage and the supporting that stops the lateral wall adopting line side thereof.
6. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 5, it is characterized in that, in step b, be permanent support to the supporting of the top board of described bordroom, top anchor cable or the anchor pole of contiguous described work plane are obliquely extended to above working face wall, the top anchor cable of control top, contiguous both sides coal column or anchor pole are obliquely extended to the top of corresponding described control top coal column, and the described anchor cable of each described control coal column both sides or anchor pole oblique above it.
7. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 6, is characterized in that, in step b, the pre support carried out top board above described bordroom top board and control top coal column is permanent support.
8. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 1, is characterized in that, in steps d, between coal-winning machine cut work plane and described passage coal column process in without the need to carrying out interim passive protecting to described passage.
9. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 1, is characterized in that, in step a, the driving width of described passage is 3m ~ 4m, is highly 2m ~ 2.5m; In step b, the Excavation Length of described bordroom is 4m ~ 5m, and width is 3m ~ 4m, is highly 2m ~ 2.5m; In step c, pulling down the height that the end extends to described passage is 5m ~ 5.5m.
10. the surrounding rock control method of fully-mechanized mining working big cross section return channel according to claim 9, is characterized in that, in step a, the driving width of described passage is 3.5m, is highly 2.5m; In step b, the Excavation Length of described bordroom is 5m, and width is 4m, is highly 2.5m; In step c, pulling down the height that the end extends to described passage is 5.5m.
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| CN104863590A (en) * | 2015-05-21 | 2015-08-26 | 中国矿业大学(北京) | Method for setting up end-mining and withdrawal roadway for fully mechanized coal mining face with large mining height |
| CN104879166A (en) * | 2015-05-08 | 2015-09-02 | 山西潞安环保能源开发股份有限公司 | Large mining height fully-mechanized working face step type digging retracement channel method |
| CN106089234A (en) * | 2016-07-15 | 2016-11-09 | 北京科技大学 | A kind of method of distance auxiliary lane multichannel Quick-return fully-mechanized mining working |
| CN106930763A (en) * | 2017-03-21 | 2017-07-07 | 太原理工大学 | A kind of method for filling the residual mining area roadway support coal column of second mining super high seam |
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| CN113356850A (en) * | 2021-07-08 | 2021-09-07 | 内蒙古利民煤焦有限责任公司 | Method and system for pre-digging and withdrawing channel of fully mechanized mining face with large mining height |
| CN113482635A (en) * | 2021-07-08 | 2021-10-08 | 淮北矿业股份有限公司 | Parallel construction method for installing and expanding cutting brush based on stack type support reinforced long-span top plate |
| CN114352282A (en) * | 2022-03-21 | 2022-04-15 | 华北科技学院(中国煤矿安全技术培训中心) | Short-distance auxiliary-roadway-free single-channel safe withdrawal method for near high-risk coal pillars |
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| CN113482635A (en) * | 2021-07-08 | 2021-10-08 | 淮北矿业股份有限公司 | Parallel construction method for installing and expanding cutting brush based on stack type support reinforced long-span top plate |
| CN114352282A (en) * | 2022-03-21 | 2022-04-15 | 华北科技学院(中国煤矿安全技术培训中心) | Short-distance auxiliary-roadway-free single-channel safe withdrawal method for near high-risk coal pillars |
| CN114352282B (en) * | 2022-03-21 | 2022-06-17 | 华北科技学院(中国煤矿安全技术培训中心) | Short-distance auxiliary-roadway-free single-channel safe withdrawal method for near high-risk coal pillars |
| CN115199272A (en) * | 2022-08-11 | 2022-10-18 | 中国矿业大学 | Full-life-cycle surrounding rock stability control method for fully-mechanized mining face pre-excavation withdrawal passage |
| CN115199272B (en) * | 2022-08-11 | 2023-07-18 | 中国矿业大学 | Full life cycle surrounding rock stability control method for fully mechanized mining face pre-digging retracting channel |
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