CN107013216A - A kind of colliery deep mining impulsion pressure prevention and controls - Google Patents
A kind of colliery deep mining impulsion pressure prevention and controls Download PDFInfo
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- CN107013216A CN107013216A CN201710342792.4A CN201710342792A CN107013216A CN 107013216 A CN107013216 A CN 107013216A CN 201710342792 A CN201710342792 A CN 201710342792A CN 107013216 A CN107013216 A CN 107013216A
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- 238000005065 mining Methods 0.000 title claims abstract description 72
- 230000002265 prevention Effects 0.000 title claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 149
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 239000011435 rock Substances 0.000 claims description 11
- 238000005422 blasting Methods 0.000 claims description 10
- 238000004880 explosion Methods 0.000 claims description 10
- 230000003628 erosive effect Effects 0.000 claims description 7
- 239000002360 explosive Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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Abstract
The invention belongs to dig up mine and safety engineering field, a kind of colliery deep mining impulsion pressure prevention and controls are disclosed, are comprised the following steps：Step a：First mining face is arranged in upper coal seam along district rise direction；Step b：The stress relaxed area arrangement district rise preparatory working group below goaf；Step c：After the preparatory working group that goes up a hill is formed, working face of coal seam and lower working face of coal seam carry out back production in the arrangement of main system both sides；Step d：Before exploitation or in recovery process, the pre- release processing of locality or impulsion pressure danger releasing measures are taken haulage way, tailgate, open-off cut of upper working face of coal seam etc..The method that the present invention provides a kind of effective lifting colliery deep mining impulsion pressure prevention effect.
Description
Technical field
The present invention relates to mining and safety engineering field, more particularly to a kind of colliery deep mining impulsion pressure preventing and treating
Method.
Background technology
Current pit mining intensity and depth are stepped up, and large quantities of mines subsequently enter the deep mining stage, with annual 10
~20m depth increase, has been enter into or will enter below km and exploit, or even the first working face of some new mines reaches km.
Mining of deep mine faces the adverse circumstances of " a three high disturbances ", in addition irrational developing exploitation arrangement, geology
Construction etc., originally shallow mining do not occur or the unconspicuous disaster of performance progressively appear or more strong.Wherein, impulsion pressure
It is complicated and destructive as typical coal rock dynamic disaster, the safety and high efficiency of serious threat mine.
The coal petrography dynamic impact problem disaster that deep mining induces is increasingly notable, especially the exploiting field of coal seam group double-vane combined layout
On coal column area of going down the hill it is more prominent.At present, the preventing and treating for deep mining impulsion pressure focuses primarily upon locality measure, expends
Greatly, effect is limited, it is difficult to fundamentally solve deep mining thump disaster problem, and existing protective coat extracted is focused primarily upon
Protrusion-dispelling, using less and mainly for getting working face in terms of erosion control, for above going down the hill, coal column area impulsion pressure prevents and treats problem
Applied.
The content of the invention
The present invention provides a kind of colliery deep mining impulsion pressure prevention and controls, solves coal seam group double-vane in the prior art and joins
(main entry) coal column area impulsion pressure diaster prevention and control effect of going down the hill on the exploiting field for closing arrangement is poor, expends big technical problem.
In order to solve the above technical problems, the invention provides a kind of colliery deep mining impulsion pressure prevention and controls, exploiting field
According to direction arrangement of going up a hill；Comprise the following steps：
Step a：First mining face is arranged in upper coal seam along district rise direction；
Step b：The stress relaxed area arrangement district rise preparatory working group below goaf；
Step c：After the preparatory working group that goes up a hill is formed, working face of coal seam and lower coal seam work in the arrangement of main system both sides
Make face and carry out back production；
Step d：Before exploitation or in recovery process, haulage way, tailgate, open-off cut of upper working face of coal seam etc. are adopted
Take the pre- release processing of locality or impulsion pressure danger releasing measures.
Further, the step a is specifically included：
Along district rise direction, a first mining face is arranged in upper coal seam；
Wherein, 150~200m of working face length；Advance distance is slightly larger than length of going up a hill, using the long-armed coal-mining method of inclination.
Further, the step b is specifically included：
Arranged between the upper coal seam and lower coal seam of the first mining face lower goaf in rock stratum or lower seat earth
Including exploiting field transport is gone up a hill, return air is gone up a hill, the preparatory working of ginney group, goaf stress relaxed area is at；
Wherein, 19~21m of spacing of the preparatory working group.
Further, the step c is specifically included：
After preparatory working group is formed, working face of coal seam and lower working face of coal seam in the arrangement of main system both sides；
Wherein, upper working face of coal seam uses mining advancing, and lower working face of coal seam uses drawing back, reduces working face
The mining influence of stress, energy and dynamic loading to coal column area roadway group of entirely going up a hill in digging disturbance.
Further, in Mining Area, following erosion control arrangement and parameter are specifically included：
Preferentially coal column, as Protective Coal Seam, is not left in the upper coal seam of exploitation in exploiting field；
Working face, which stops adopting line horizontal range, goes up a hill more than or equal to 80m；
Lower working face of coal seam stops adopting line or the parallel interior wrong upper 10~20m of working face of coal seam goaf of open-off cut, is unloaded in it
In nip；
Wrong upper 10~50m of working face of coal seam goaf in lower working face of coal seam tunnel；
3~5m of section coal pillar width between Adjacent Working Face.
Further, in the step d, using large diameter borehole, coal-bed flooding as pre- unloading pressure means, using coal body
Explosion, top plate presplit blasting release are used as danger releasing measures；
Specific technical parameter, large diameter borehole：1~2m of pitch-row, hole depth 15m~20m, 110~125mm of aperture；Coal seam
Water filling：Pitch-row 5m, aperture 82mm, hole depth 30m, sealed borehole length 10m, 6~10MPa of water injection pressure；Coal body explosion：Aperture 42mm,
Hole depth 10m, spacing 5m, sealed borehole length 5m, explosive payload 3.0kg；Top plate presplit blasting：Pitch-row 5m, aperture 42mm, hole depth 20m, envelope
Hole length 10m, explosive payload 6.0kg.
Further, exploiting field according to go down the hill direction arrangement or on go down the hill combined layout or zone formula arrange.
The one or more technical schemes provided in the embodiment of the present application, have at least the following technical effects or advantages：
The colliery deep mining impulsion pressure prevention and controls provided in the embodiment of the present application, especially for Deep Well Coal Bed, group is double
Go down the hill on the exploiting field of the wing combined layout protection coal pillar area.During using the erosion control optimization placement method, by the length of service long, stability
It is required that high, long-term should in the upper working face of coal seam lower goaf bottom plate exploited in advance by roadway layout of going down the hill on mining influence
Power reduces area, it is to avoid coal column high stress concentration zone of going down the hill in formation, reduces dead load, improves roadway surrounding rock stress distribution,
Reduce roadway maintenance cost, improve Drift stability；Upper working face of coal seam mining advancing, avoids ahead work face branch bearing capacity
To the disturbing influence to above going down the hill, shaken while being shaken using the first mining face goaf incompact fractured surrounding rock structure in upper coal seam to ore deposit
The strong attenuation of ripple weakens lower working face of coal seam lead abutment pressure and the dynamic load of upper go-downhill roadway is disturbed, and then reduces both sides
The digging disturbance of working face of coal seam up and down, makes go-downhill roadway be carried overlaying influence by sound most weak；Coal seam above and below main system both sides
The optimization design of roadway workface arrangement parameter can reduce stress concentration degree to greatest extent, and reduction impulsion pressure occurs
Possibility；In addition, in the upper working face of coal seam mining process higher to shock hazard implement large diameter borehole, coal body explosion and
The locality impulsive control measure such as top plate presplit blasting release, other regions show situation according to impact and take adaptable part
Control measure, the further supplement controlled as whole deep mining impulsion pressure dynamic disaster.
Brief description of the drawings
Horizontal layout schematic diagram in the colliery deep mining impulsion pressure prevention and controls that Fig. 1 provides for the present invention；
Fig. 2 is Fig. 1 profile.
Embodiment
The embodiment of the present application solves coal in the prior art by providing a kind of colliery deep mining impulsion pressure prevention and controls
(main entry) coal column area impulsion pressure diaster prevention and control effect of going down the hill on the exploiting field of floor group's double-vane combined layout is poor, expends big technology and asks
Topic；Lifting local control effect has been reached, the technique effect of cost is reduced.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper
State technical scheme to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application skill
The detailed description of art scheme, rather than the restriction to technical scheme, in the case where not conflicting, the embodiment of the present application
And the technical characteristic in embodiment can be mutually combined.
A kind of colliery deep mining impulsion pressure prevention and controls, exploiting field is arranged according to direction of going up a hill；Comprise the following steps：
Step a：First mining face is arranged in upper coal seam along district rise direction；
Step b：The stress relaxed area arrangement district rise preparatory working group below goaf；
Step c：After the preparatory working group that goes up a hill is formed, working face of coal seam and lower coal seam work in the arrangement of main system both sides
Make face and carry out back production；
Step d：Before exploitation or in recovery process, haulage way, tailgate, open-off cut of upper working face of coal seam etc. are adopted
Take the pre- release processing of locality or impulsion pressure danger releasing measures.
The step a is specifically included：
Along district rise direction, a first mining face is arranged in upper coal seam；
Wherein, 150~200m of working face length；Advance distance is slightly larger than length of going up a hill, using the long-armed coal-mining method of inclination.
The step b is specifically included：
Arranged between the upper coal seam and lower coal seam of the first mining face lower goaf in rock stratum or lower seat earth
Gone up a hill including exploiting field transport, the preparatory working such as return air is gone up a hill, ginney group, be at goaf stress relaxed area；
Wherein, 19~21m of spacing of the preparatory working group.
The step c is specifically included：
After preparatory working group is formed, working face of coal seam and lower working face of coal seam in the arrangement of main system both sides；
Wherein, upper working face of coal seam uses mining advancing, and lower working face of coal seam uses drawing back, reduces working face
The mining influence of stress, energy and dynamic loading to coal column area roadway group of entirely going up a hill in digging disturbance.
In Mining Area, following erosion control arrangement and parameter are specifically included：
Preferentially coal column, as Protective Coal Seam, is not left in the upper coal seam of exploitation in exploiting field；
Working face, which stops adopting line horizontal range, goes up a hill more than or equal to 80m；
Lower working face of coal seam stops adopting line or the parallel interior wrong upper 10~20m of working face of coal seam goaf of open-off cut, is unloaded in it
In nip；
Wrong upper 10~50m of working face of coal seam goaf in lower working face of coal seam tunnel；
3~5m of section coal pillar width between Adjacent Working Face.
In the step d, using large diameter borehole, coal-bed flooding as pre- unloading pressure means, using coal body explosion, top plate
Presplit blasting release is used as danger releasing measures；
Specific technical parameter, large diameter borehole：1~2m of pitch-row, hole depth 15m~20m, 110~125mm of aperture；Coal seam
Water filling：Pitch-row 5m, aperture 82mm, hole depth 30m, sealed borehole length 10m, 6~10MPa of water injection pressure；Coal body explosion：Aperture 42mm,
Hole depth 10m, spacing 5m, sealed borehole length 5m, explosive payload 3.0kg；Top plate presplit blasting：Pitch-row 5m, aperture 42mm, hole depth 20m, envelope
Hole length 10m, explosive payload 6.0kg.
Referring to Fig. 1 and Fig. 2, in figure：Described a kind of colliery deep mining impulsion pressure prevention and controls, first in upper coal seam
Arrange a first mining face 1 in coal column area of going up a hill；Then 2 are gone up a hill in its gob floor stress relaxed area deployment rails, transport
The preparatory working group 3 such as go up a hill；Main system carries out rational exploitation arrangement after being formed to upper working face of coal seam 4, lower working face of coal seam 5,
Upper working face of coal seam protrusive, lower working face of coal seam drawing back；Needed during exploitation to upper working face of coal seam tailgate 6,
The upper working face of coal seam stope drift active workings entity coal side such as upper working face of coal seam haulage way 7, upper working face of coal seam open-off cut 8 is taken greatly
The pre- release processing of the localities such as diameter bores, coal-bed flooding, coal body explosion and top plate presplit blasting or impact danger releasing measures, simultaneously
Lower working face of coal seam tailgate 9, lower working face of coal seam haulage way 10, lower working face of coal seam are opened according to field monitoring situation
Cut working face of coal seam tunnel and ginney 2 under the grade of eye 11, transport preparatory workings such as 3 of going up a hill and take corresponding measure, as whole
The further supplement of deep mining impulsion pressure dynamic disaster design arrangement method.
Said structure is arranged according to district rise, but the application not limited to this, is also accommodated in district dip arrangement, up and down
Mountain combined layout or zone formula arrangement etc..
Certain colliery deep mining impulsion pressure prevention and controls and Mining block design method for arranging that the present embodiment is provided, especially
Suitable for the method for km Deep Well Coal Bed group's double-vane combined layout exploiting field thump dynamic disaster preventing and treating.
First, a working face is arranged in upper coal seam along direction of going up a hill, then on its goaf arranged beneath exploiting field
Mountain preparatory working, arranges working face of coal seam, lower working face of coal seam after main system is formed in its both sides, and it includes following step
Suddenly：
A first mining face, 150~200m of working face length are arranged in upper coal seam along district rise direction, it is however generally that
It is not less than 100m, advance distance is generally the length sum of three working faces, depending on the length gone up a hill, slightly larger than length of going up a hill
Degree, tilts long-armed coal-mining method, that is, faces upward to adopt or bow and adopt.
Then arrange and adopt in rock stratum or lower seat earth between coal seam and lower coal seam on first mining face lower goaf
The preparatory workings such as area's transport is gone up a hill, return air is gone up a hill, ginney, spacing about 20m is at the reduction of gob floor stress
Area, improves surrouding rock stress distribution occasion, improves Drift stability.
After roadway group to be prepared is formed, working face of coal seam and lower working face of coal seam, upper coal seam in the arrangement of main system both sides
Working face mining advancing, lower working face of coal seam drawing back reduces stress, energy and dynamic loading in working face digging disturbance
To the mining influence for coal column area roadway group of entirely going up a hill.
Upper working face of coal seam is as protective coat extracted, and its mining work shock hazard is higher, exploits preceding or recovery process
Middle needs take large diameter borehole, coal-bed flooding, coal body explosion and top plate presplit blasting release etc. in tunnel both sides entity coal side
The pre- release processing of locality or impact danger releasing measures；And lower working face of coal seam is exploited under protective layer, its shock hazard is obvious
Weaken, surge guard dynamics is relatively small, does not according to circumstances take or take slight locality prevention and control measure；Additionally will be
Bord-up group monitors its surrouding rock stress situation of change at the embedded pressure cushion moment, takes suitable when working face is close to back production line
Local provisions.
Further, preferably, the specific erosion control arrangement parameter of the Mining Area of coal seam group double-vane combined layout：Exploiting field is excellent
Upper coal seam is first exploited as Protective Coal Seam, coal column is not left as far as possible, lower working face of coal seam is under upper working face of coal seam goaf
In square distressed zone；Working face stops adopting line horizontal range district rise not less than 80m, reduces digging disturbance to whole bord-up group
Influence；Working face open-off cut or stop adopts the parallel interior wrong arrangement of line between upper coal seam, and lower working face of coal seam stops adopting line or open-off cut
Interior wrong upper 10~20m of working face of coal seam goaf, in its distressed zone；Wrong upper coal seam work in lower working face of coal seam section road
10~50m of face goaf；Coal mine goaf, 3~5m of working face section coal pillar width are used between Adjacent Working Face；This coal of exploiting field
Order mining between layer working face, forbids island working face occur；Face length is not less than 100m；Ahead work face supporting is long
Degree is not less than 150m.
The one or more technical schemes provided in the embodiment of the present application, have at least the following technical effects or advantages：
The colliery deep mining impulsion pressure prevention and controls provided in the embodiment of the present application, especially for Deep Well Coal Bed, group is double
Go down the hill on the exploiting field of the wing combined layout protection coal pillar area.During using the erosion control optimization placement method, by the length of service long, stability
It is required that high, long-term should in the upper working face of coal seam lower goaf bottom plate exploited in advance by roadway layout of going down the hill on mining influence
Power reduces area, it is to avoid coal column high stress concentration zone of going down the hill in formation, reduces dead load, improves roadway surrounding rock stress distribution,
Reduce roadway maintenance cost, improve Drift stability；Upper working face of coal seam mining advancing, avoids ahead work face branch bearing capacity
To the disturbing influence to above going down the hill, shaken while being shaken using the first mining face goaf incompact fractured surrounding rock structure in upper coal seam to ore deposit
The strong attenuation of ripple weakens lower working face of coal seam lead abutment pressure and the dynamic load of upper go-downhill roadway is disturbed, and then reduces both sides
The digging disturbance of working face of coal seam up and down, makes go-downhill roadway be carried overlaying influence by sound most weak；Coal seam above and below main system both sides
The optimization design of roadway workface arrangement parameter can reduce stress concentration degree to greatest extent, and reduction impulsion pressure occurs
Possibility；In addition, in the upper working face of coal seam mining process higher to shock hazard implement large diameter borehole, coal body explosion and
The locality impulsive control measure such as top plate presplit blasting release, other regions show situation according to impact and take adaptable part
Control measure, the further supplement controlled as whole deep mining impulsion pressure dynamic disaster.
It should be noted last that, above embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention, it all should cover
Among scope of the presently claimed invention.
Claims (7)
1. a kind of colliery deep mining impulsion pressure prevention and controls, it is characterised in that exploiting field is arranged according to direction of going up a hill；Including such as
Lower step：
Step a：First mining face is arranged in upper coal seam along district rise direction；
Step b：The stress relaxed area arrangement district rise preparatory working group below goaf；
Step c：After the preparatory working group that goes up a hill is formed, working face of coal seam and lower working face of coal seam in the arrangement of main system both sides
Carry out back production；
Step d：Before exploitation or in recovery process, office is taken to haulage way, tailgate, open-off cut of upper working face of coal seam etc.
The pre- release processing of portion's property or impulsion pressure danger releasing measures.
2. colliery deep mining impulsion pressure prevention and controls as claimed in claim 1, it is characterised in that the step a is specific
Including：
Along district rise direction, a first mining face is arranged in upper coal seam；
Wherein, 150~200m of working face length；Advance distance is slightly larger than length of going up a hill, using the long-armed coal-mining method of inclination.
3. colliery deep mining impulsion pressure prevention and controls as claimed in claim 1, it is characterised in that the step b is specific
Including：
Being arranged between the upper coal seam and lower coal seam of the first mining face lower goaf in rock stratum or lower seat earth includes
Exploiting field transport is gone up a hill, return air is gone up a hill, the preparatory working of ginney group, is at goaf stress relaxed area；
Wherein, 19~21m of spacing of the preparatory working group.
4. colliery deep mining impulsion pressure prevention and controls as claimed in claim 1, it is characterised in that the step c is specific
Including：
After preparatory working group is formed, working face of coal seam and lower working face of coal seam in the arrangement of main system both sides；
Wherein, upper working face of coal seam uses mining advancing, and lower working face of coal seam uses drawing back, reduces working face digging
The mining influence of stress, energy and dynamic loading to coal column area roadway group of entirely going up a hill in disturbance.
5. colliery deep mining impulsion pressure prevention and controls as claimed in claim 1, it is characterised in that in Mining Area,
Specifically include following erosion control arrangement and parameter：
Preferentially coal column, as Protective Coal Seam, is not left in the upper coal seam of exploitation in exploiting field；
Working face, which stops adopting line horizontal range, goes up a hill more than or equal to 80m；
Lower working face of coal seam stops adopting line or the parallel interior wrong upper 10~20m of working face of coal seam goaf of open-off cut, in its distressed zone
It is interior；
Wrong upper 10~50m of working face of coal seam goaf in lower working face of coal seam tunnel；
3~5m of section coal pillar width between Adjacent Working Face.
6. colliery deep mining impulsion pressure prevention and controls as claimed in claim 1, it is characterised in that
In the step d, using large diameter borehole, coal-bed flooding as pre- unloading pressure means, using coal body explosion, top plate presplitting
Unloading pressure by blasting is used as danger releasing measures；
Specific technical parameter, large diameter borehole：1~2m of pitch-row, hole depth 15m~20m, 110~125mm of aperture；Coal-bed flooding：
Pitch-row 5m, aperture 82mm, hole depth 30m, sealed borehole length 10m, 6~10MPa of water injection pressure；Coal body explosion：Aperture 42mm, hole depth
10m, spacing 5m, sealed borehole length 5m, explosive payload 3.0kg；Top plate presplit blasting：Pitch-row 5m, aperture 42mm, hole depth 20m, sealing of hole is long
Spend 10m, explosive payload 6.0kg.
7. the colliery deep mining impulsion pressure prevention and controls as described in all items of claim 1~6, it is characterised in that：Exploiting field
According to go down the hill direction arrangement or on go down the hill combined layout or zone formula arrangement.
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| CN107725053A (en) * | 2017-11-08 | 2018-02-23 | 山东科技大学 | Lane is reserved for one's own use without pillar mining method suitable for the exploiting field of gently inclined seam |
| CN107882565A (en) * | 2017-10-31 | 2018-04-06 | 中国中煤能源集团有限公司 | A kind of adopted without driving without coal column stays integral production practice |
| CN109854245A (en) * | 2018-12-26 | 2019-06-07 | 龙口矿业集团有限公司 | A kind of erosion control safety method of Coal Face Passing Through connection roadway |
| WO2019148788A1 (en) * | 2018-01-31 | 2019-08-08 | 中国矿业大学 | Method for preventing rock bursts by means of active support reinforcement and active pressure relief |
| CN111271120A (en) * | 2020-01-22 | 2020-06-12 | 天地科技股份有限公司 | Coal mine rock burst dynamic and static load source-based danger relieving method |
| CN113236360A (en) * | 2021-06-29 | 2021-08-10 | 中煤科工开采研究院有限公司 | Method for preventing and controlling exploding roadway group rock burst |
| CN113482718A (en) * | 2021-08-10 | 2021-10-08 | 中煤科工开采研究院有限公司 | Method for preventing rock burst through pressure relief arrangement of roadway group of coal seam panel |
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| CN107725053B (en) * | 2017-11-08 | 2019-04-05 | 山东科技大学 | Lane is reserved for one's own use without pillar mining method in exploiting field suitable for gently inclined seam |
| WO2019148788A1 (en) * | 2018-01-31 | 2019-08-08 | 中国矿业大学 | Method for preventing rock bursts by means of active support reinforcement and active pressure relief |
| US10655465B2 (en) | 2018-01-31 | 2020-05-19 | China University Of Mining And Technology | Method for rock burst prevention by active support reinforcement and active pressure relief |
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| CN111271120A (en) * | 2020-01-22 | 2020-06-12 | 天地科技股份有限公司 | Coal mine rock burst dynamic and static load source-based danger relieving method |
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