CN104819010B - The construction method of prevention top board and Water Inrush when a kind of coal mine work area crosses water conductive fault - Google Patents
The construction method of prevention top board and Water Inrush when a kind of coal mine work area crosses water conductive fault Download PDFInfo
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- CN104819010B CN104819010B CN201510134180.7A CN201510134180A CN104819010B CN 104819010 B CN104819010 B CN 104819010B CN 201510134180 A CN201510134180 A CN 201510134180A CN 104819010 B CN104819010 B CN 104819010B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000003245 coal Substances 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 35
- 230000002265 prevention Effects 0.000 title claims abstract description 12
- 238000003325 tomography Methods 0.000 claims abstract description 30
- 238000007569 slipcasting Methods 0.000 claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 21
- 239000004567 concrete Substances 0.000 claims abstract description 15
- 239000011378 shotcrete Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008093 supporting effect Effects 0.000 claims abstract description 9
- 239000004568 cement Substances 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000005065 mining Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000003204 osmotic effect Effects 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000010348 incorporation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000010287 polarization Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims description 2
- 210000002966 serum Anatomy 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 abstract 1
- 230000003487 anti-permeability effect Effects 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 238000013005 condensation curing Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 206010058109 Hangnail Diseases 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses the construction method of prevention top board and Water Inrush when a kind of coal mine work area crosses water conductive fault, it breaks through the prejudice of prior art, use first drainage and step-down audaciously, beat pass keyhole afterwards, use grouted anchor bar to carry out anchor bolt grouting in closing keyhole, use gunite concrete to fill and lead up the construction method of sunk area of country rock, top board and base plate three each periphery again.I.e., use ejectment to close keyhole Draining hook, keyhole anchoring reinforcing country rock is closed in slip casting, and then surrounding rock supporting, strengthen crushed zone and Seam Roof And Floor around tomography and destroy the mechanical property of band, increase the technological means such as anti-permeability performance, preferably solve the technical problem of coal mine work area safety water conductive fault.The present invention has security, good reliability, the feature such as construction method is simple, low cost, has preferable Technique Popularizing and is worth.
Description
Technical field
The present invention relates to the construction method of a kind of underground coal mine prevention gushing water, particularly relate to preventing and treating during a kind of Coal Face Passing Through water conductive fault
The construction method of roof and floor gushing water.
Background technology
With being continuously increased of coal mining depth, mining conditions, geological conditions become increasingly complex, during working face extraction,
Passing fault back production often occur, this brings very big difficulty to safety in production, especially during passing fault, it is easy to occur dashing forward in colliery
The accidents such as water, roof fall, country rock are caving.Main reason is that, the existence of tomography destroys the integrality of floor strata, reduces
The intensity of rock mass, fault belt has good transmissibility and water storage again.
For a long time, those skilled in the art thinks always: for high pressure water conductive fault, can only block up, it is impossible to put, as
Fruit discharges water, and tomography geological conditions can be caused more severe；During Coal Face Passing Through Fault, the tectonic termination integrality of rock stratum, need to choose
Top or planted agent, increase workload；If additionally, direct supporting during passing fault, it will increase boring amount, and supporting effect is paid no attention to
Think, the accidents such as roof fall, pucking, gushing water easily occur.
Although prior art has worked out safe precaution measure and the seam mining method that various coal mine work area crosses water conductive fault,
But, its security aspect never has preferable solution, and, the reliability of these methods is with cost control aspect also
There is all many deficiencies.
Content of the invention
It is an object of the invention to, provide that a kind of construction method is simple, coal mine work area that reliability, security are good is crossed water guide and broken
The construction method of roof and floor gushing water during layer.
The present invention be employed technical scheme comprise that for achieving the above object, when a kind of coal mine work area crosses water conductive fault prevention top board and
The construction method of Water Inrush, it is characterised in that comprise the following steps:
The first step, finely detects to the neighboring region in water conductive fault periphery different distance, obtains corresponding geological conditions number
According to specific as follows:
During working face mining, when working face wall distance water conductive fault is 140m, use 3-d seismic exploration technology
The three-dimensional position of long-range detection tomography；
When distance water conductive fault is 100m, use the spatial shape of distance measurement tomography in Transient Electromagnetic Technique；
When distance water conductive fault is 60m, use the watery of induced polarization technology proximity detection tomography；
Second step, when the advance of the face to tomography waterproof safety coal column, at working face wall symmetrical centre point, along level side
Closing keyhole to playing ejectment, aperture is 42mm, and hole depth is until in fault belt, carrying out drawing drainage and step-down, until hydraulic pressure reduces
To below 0.2MPa；
The width L of above-mentioned tomography waterproof safety coal column, is calculated as follows formula and calculates:
In above formula (1):
A is safety coefficient (empirical data, span is 2～5)；
M is coal seam thickness；
P is born hydraulic pressure by water barrier；
KpTensile strength for coal seam；
3rd step, plays slip casting and closes keyhole, and anchor bolt grouting reinforces country rock, and method is as follows:
In the midpoint of working face wall and base plate intersection, get first slip casting being perpendicular to tomography and close keyhole, hole depth until
Fault belt；
The midpoint on intersection between working face wall and top board, gets one and is inclined upwardly, with the horizontal certain angle
The second slip casting close keyhole, hole depth is until fault belt；
Then, grouted anchor bar is used to carry out anchor bolt grouting in keyhole is closed in above-mentioned first slip casting and keyhole is closed in the second slip casting respectively；
4th step, after anchor bolt grouting, when being constantly advanced into exposure water conductive fault with working face, first uses resin anchor to working face
Top board and both sides country rock carry out supporting, after supporting completes；
Use gunite concrete to fill and lead up country rock, top board and the sunk area of base plate three each periphery again, i.e. complete construction.
What technique scheme was directly brought has the technical effect that, first, closes keyhole Draining hook by ejectment；Then, by note
Slurry closes keyhole grouting reinforcement rock, reduces boring amount, it is achieved far-end dams closure, around reinforcement tomography at the bottom of crushed zone and top, coal seam
Plate destroys the accidents such as the mechanical property of band, preventing and treating gushing water, roof fall, pucking, makes coal mine work area safety water conductive fault.
The construction method of technique scheme, overcomes the long-term technology prejudice of those skilled in the art, courageously uses Draining hook
Technological thought, by first beat ejectment close keyhole, carry out Draining hook；On this basis, play slip casting and close keyhole, and carry out anchor
Gu slip casting, reinforce；The sunk area of country rock, top board and base plate three each periphery is finally reinforced with gunite concrete, thus real
Existing coal mine work area safety water conductive fault.
Above-mentioned construction method is simple, boring amount is little, and owing to anchor bolt grouting is set up on the basis of Draining hook, this is greatly reduced
The difficulty of construction of slip casting and construction workload, and grouting consolidation effect is greatly improved, ensure that Coal Face Passing Through water guide breaks
During layer, top board and base plate do not have water inrush accident；
And finally reinforce the sunk area of country rock, top board and base plate three each periphery with gunite concrete, thus realize coalman
Make face safety water conductive fault.
Above-mentioned construction method safety and reliability in terms of top board and Water Inrush when water conductive fault is crossed in prevention work face is good, and
And can effectively eliminate the generation of other secondary disasters that may cause because of water inrush accident.
Being preferably, the angle of above-mentioned angle determines as the following formula:
In above formula (2):
H is overlying rock height of water flowing fractured zone；
L is the width of tomography waterproof safety coal column.
What this optimal technical scheme was directly brought has the technical effect that, uses above formula to carry out the calculating that keyhole angle of inclination is closed in the second slip casting,
And according to this result of calculation guiding construction, not only improve rapid construction and cost control, be conducive to again improving operating efficiency, reduce
The waste of the manpower and materials caused by maloperation.
Further preferably, the grouting pressure of above-mentioned anchor bolt grouting is the mixing that 0.3～0.8MPa, injecting paste material are cement and waterglass
Slurries, grouting mode are osmotic grouting.
What this optimal technical scheme was directly brought has the technical effect that, the grouting pressure of osmotic grouting is 0.3～0.8MPa, it is ensured that
The diffusion zone of slip casting is sufficiently large；And use admixture to have the cement mortar of waterglass, the moisture of cement mortar can be reduced, enter one
Step ensures that the diffusion zone of slip casting is sufficiently large, and accelerates the condensation cure speed of cement mortar, shortens construction period, improves construction effect
Rate.
Further preferably, the strength grade of above-mentioned gunite concrete is C20.
What this optimal technical scheme was directly brought has the technical effect that, practical production experience shows, the strength grade choosing of gunite concrete
Select C20 and can fully meet the requirement of security.
Further preferably, above-mentioned gunite concrete is prepared as follows: raw material is cement, sand, stone and accelerator,
Add water to mix and stir and form；Wherein, by weight cement=1 22；The incorporation of accelerator is cement weight
2～3.5%.
What this optimal technical scheme was directly brought has the technical effect that, can accelerate the condensation cure speed of concrete, improves construction effect
Rate.
In sum, instant invention overcomes the technology prejudice of prior art, it has safety and reliability relative to prior art
Well, the beneficial effects such as construction method is simple, efficiency is high, low cost.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1
As a example by certain colliery, in recovery process, top board and Water Inrush when crossing water conductive fault to this coal mine work area, is prevented to execute
Work method is illustrated:
Construction method, comprises the following steps:
The first step, finely detects to the neighboring region in water conductive fault periphery different distance, obtains corresponding geological conditions number
According to specific as follows:
1st, during working face mining, when working face wall distance water conductive fault is 140m, 3-d seismic exploration skill is used
The three-dimensional position of art long-range detection tomography.Acquired information is: this working face front water guide normal fault bearing of trend is near
NNW-SSE, length 1.8km.
2nd, when distance water conductive fault is 100m, the spatial shape of distance measurement tomography in Transient Electromagnetic Technique is used.Acquired
Information is: fault throw 80-120m；Tendency NW, 45 ° of inclination angle.
3rd, when distance water conductive fault is 60m, the watery of induced polarization technology proximity detection tomography is used.Acquired letter
Breath is: tomography top is water-bearing layer, has stronger watery, hydraulic pressure 2.1MPa.
Second step, is calculated as follows formula and calculates the width L of tomography waterproof safety coal column:
According to the reality in this colliery, take margin A=3, coal seam thickness M=2.1m, hydraulic pressure P=2.1MPa, resisting of coal seam
Tensile strength Kp=0.21MPa.
Being calculated by (1) formula, the width of tomography waterproof safety coal column is 16.1m.
When the advance of the face to distance tomography 16.1m, at working face wall symmetrical centre point, play ejectment in the horizontal direction and close
Keyhole, aperture is 42mm, and hole depth penetrates tomography waterproof safety coal column until entering in fault belt, carries out drawing drainage and step-down,
It is reduced to below 0.2MPa to hydraulic pressure；
3rd step, plays slip casting and closes keyhole, and anchor bolt grouting reinforces country rock, and drilling method is as follows:
In the midpoint of working face wall and base plate intersection, get first slip casting being perpendicular to tomography and close keyhole, hole depth until
Fault belt；
The midpoint on intersection between working face wall and top board, gets one and is inclined upwardly, with the horizontal certain angle
The second slip casting close keyhole, hole depth is until fault belt；The angular dimension of this angle determines as the following formula:
In above formula (2), take the overlying rock height of water flowing fractured zone h=16m of this ore deposit, due to the width of tomography waterproof safety coal column
L=16.1m.This angle number of degrees can be calculated and approximate 45 °.
Then, grouted anchor bar is used to carry out anchor bolt grouting in keyhole is closed in above-mentioned first slip casting and keyhole is closed in the second slip casting respectively.Tool
Grouted anchor bar is injected slip casting and closes in keyhole by gymnastics conduct: install anchor head, and anchor pole is tangled by hangnail on anchor head immediately, peace
Dress stop grouting plug, backing plate, nut, and then by end of anchor rod and connect slip casting machine connection by quick filling adaptor, by grouting pressure
Control is at 0.6MPa, and injecting paste material is the double slurries of cement-sodium silicate, and its proportioning is 1:1, and grouting mode is osmotic grouting.
When two fluid grouting is 110L/min, after stablizing 20～30min, estimate that slip casting penetration radius reaches certain scope, can expire
When foot improves the coffer mechanics intensity around tomography, terminate slip casting.
4th step, after anchor bolt grouting, when being constantly advanced into exposure water conductive fault with working face, first uses resin anchor to working face
Top board and both sides country rock carry out supporting；After supporting completes, then it is each with base plate three to use gunite concrete to fill and lead up country rock, top board
From the sunk area of periphery, i.e. complete construction.
In actual production process, when this coal mine work area crosses water conductive fault, its top board and base plate are there is gushing water, does not also occur
More obvious Seepage.The construction method of the present invention is described, when coal mine work area is crossed water conductive fault by it, prevention top board and
The effect of Water Inrush is fairly obvious.
Supplementary notes:
1st, the specific requirement according to the aspect such as construction speed, construction period, the grouting pressure of above-mentioned anchor bolt grouting can be at 0.3～0.8MPa
In the range of arbitrarily select, injecting paste material is cement and the mixed serum of waterglass, grouting mode are osmotic grouting.
2nd, the strength grade of above-mentioned gunite concrete is C20, can meet construction requirement.
3rd, above-mentioned gunite concrete is preferably, and prepares as follows: raw material is cement, sand, stone and accelerator, adds
Water mixes and stirs and forms；Wherein, by weight cement=1 22；The incorporation of accelerator is cement weight
2～3.5%.Such gunite concrete, on the one hand, its mobile performance is good；On the other hand, its condensation cure time is relatively
Rationally, it is simple to construction.
Claims (5)
1. the construction method of prevention top board and Water Inrush when a coal mine work area crosses water conductive fault, it is characterised in that comprise the following steps:
The first step, finely detects to the neighboring region in water conductive fault periphery different distance, obtains corresponding geological conditions data, specific as follows:
During working face mining, when working face wall distance water conductive fault is 140m, use the three-dimensional position of 3-d seismic exploration technology long-range detection tomography；
When distance water conductive fault is 100m, use the spatial shape of distance measurement tomography in Transient Electromagnetic Technique；
When distance water conductive fault is 60m, use the watery of induced polarization technology proximity detection tomography；
Second step, when the advance of the face to tomography waterproof safety coal column, at working face wall symmetrical centre point, play ejectment in the horizontal direction and close keyhole, aperture is 42mm, hole depth penetrates tomography waterproof safety coal column until entering in fault belt, carries out drawing drainage and step-down, is reduced to below 0.2MPa to hydraulic pressure；
The width L of above-mentioned tomography waterproof safety coal column, is calculated as follows formula and calculates:
In above formula (1):
A is safety coefficient, empirical data, and span is 2～5；
M is coal seam thickness；
P is born hydraulic pressure by water barrier；
KpTensile strength for coal seam；
3rd step, plays slip casting and closes keyhole, and anchor bolt grouting reinforces country rock, and drilling method is as follows:
In the midpoint of working face wall and base plate intersection, getting first slip casting being perpendicular to tomography and closing keyhole, hole depth is until fault belt；
The midpoint on intersection between working face wall and top board, get one be inclined upwardly, keyhole is closed in the second slip casting with the horizontal certain angle, hole depth is until fault belt；
Then, grouted anchor bar is used to carry out anchor bolt grouting in keyhole is closed in above-mentioned first slip casting and keyhole is closed in the second slip casting respectively；
4th step, after anchor bolt grouting, when being constantly advanced into exposure water conductive fault with working face, first uses top board and both sides country rock to working face for the resin anchor to carry out supporting；After supporting completes, then use gunite concrete to fill and lead up country rock, top board and the sunk area of base plate three each periphery, i.e. complete construction.
2. the construction method of prevention top board and Water Inrush when coal mine work area according to claim 1 crosses water conductive fault, it is characterised in that the angle of described angle determines as the following formula:
In above formula (2):
H is overlying rock height of water flowing fractured zone；
L is the width of tomography waterproof safety coal column.
3. the construction method of prevention top board and Water Inrush when coal mine work area according to claim 1 crosses water conductive fault, it is characterized in that, the grouting pressure of described anchor bolt grouting be mixed serum, grouting mode that 0.3～0.8MPa, injecting paste material are cement and waterglass be osmotic grouting.
4. the construction method of prevention top board and Water Inrush when coal mine work area according to claim 1 crosses water conductive fault, it is characterised in that the strength grade of described gunite concrete is C20.
5. the construction method of prevention top board and Water Inrush when coal mine work area according to claim 4 crosses water conductive fault, it is characterized in that, described gunite concrete is prepared as follows: raw material is cement, sand, stone and accelerator, and adding water to mix and stir forms；Wherein, by weight cement: husky: stone=1:2:2；The incorporation of accelerator is the 2～3.5% of cement weight.
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| CN106050185B (en) * | 2016-05-13 | 2018-05-04 | 山东科技大学 | A kind of coal mining bottom plate meets the control method that tomography produces water inrush channel |
| CN106089296B (en) * | 2016-06-16 | 2018-09-18 | 陕西省煤田地质有限公司 | A kind of prevention and treatment method of roof absciss layer water |
| CN109681269A (en) * | 2019-01-16 | 2019-04-26 | 内蒙古上海庙矿业有限责任公司 | Soft rocks are lauched-and husky mixing is prominent gushes Prevention Technique method |
| CN110685740A (en) * | 2019-09-26 | 2020-01-14 | 天地科技股份有限公司 | Method for preventing water damage of shallow-buried deep-thick coal seam mining burned rock |
| CN112901272A (en) * | 2021-01-15 | 2021-06-04 | 贵州化工建设有限责任公司 | Geophysical prospecting and drilling cooperative advanced water detection and drainage construction method |
| CN113738448A (en) * | 2021-09-13 | 2021-12-03 | 中国矿业大学 | Mining rock mass seepage and water inrush near-far multisource grading information intelligent monitoring and early warning method |
| CN114837663B (en) * | 2022-05-20 | 2023-01-17 | 安徽建筑大学 | Construction method for improving recovery rate of fault waterproof coal pillar through ground pre-grouting |
| CN115012933B (en) * | 2022-05-20 | 2023-01-17 | 安徽恒源煤电股份有限公司 | Zonal grouting construction method for stoping fault waterproof coal pillar |
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| US4272128A (en) * | 1980-01-30 | 1981-06-09 | Jacoby Charles H | Method of creating a safe environment in salt mining |
| SU1079851A1 (en) * | 1982-05-31 | 1984-03-15 | Днепропетровский Государственный Ордена Трудового Красного Знамени Проектный Институт "Днепрогипрошахт" | Method and apparatus for roof control at stoping faces |
| CN102061920B (en) * | 2010-12-24 | 2013-04-17 | 西安科技大学 | Exploring method of water liberation working surface of water-enriched mine area |
| CN102705005B (en) * | 2012-04-01 | 2015-05-13 | 中国矿业大学(北京) | Technology for plugging water bursting in mine by directional diversion grouting |
| CN102645674B (en) * | 2012-04-17 | 2013-12-18 | 河北煤炭科学研究院 | Three-dimensional detection method for use before exploitation of working surface coal bed |
| CN102587859A (en) * | 2012-04-17 | 2012-07-18 | 中国矿业大学(北京) | Technology for blocking mine water bursting through backflow grouting |
| CN102704950B (en) * | 2012-06-21 | 2014-06-11 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Support method used in passing water guide fracture structure in mine exploration |
| CN103291325B (en) * | 2013-06-25 | 2015-08-19 | 山东科技大学 | The preventing control method of Coal-mining Above Confined-water floor strata gushing water |
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