CN109142027A - Working face driving causes Coal Outburst Visualization method - Google Patents
Working face driving causes Coal Outburst Visualization method Download PDFInfo
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- CN109142027A CN109142027A CN201810949906.6A CN201810949906A CN109142027A CN 109142027 A CN109142027 A CN 109142027A CN 201810949906 A CN201810949906 A CN 201810949906A CN 109142027 A CN109142027 A CN 109142027A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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Abstract
It is tunneled the invention discloses a kind of working face and causes Coal Outburst Visualization method, the following steps are included: production experimental rig, seal cavity and transparent box including concave, the notch portion of seal cavity constitutes test specimen placed cavity, front pressuring plate is equipped with forward press, a left side for test specimen placed cavity, it is right, rear side is equipped with side plate, the head end of side plate is provided with air hole, side plate is equipped with side pressure bar, front and back is immediately provided with top board above upper padding plate, top board is equipped with upperpush rod, the end of upperpush rod is using the structure for installing spherical ball between two clamping plates, fluid entry holes are provided on the side wall of seal cavity, Fluid-exiting apertures are provided on the side wall of transparent box；Prepare coal dust；Moulded coal test material preparation；The installation of moulded coal test specimen；Apply triaxial stress；Apply gas pressure；It is tested；With other tests are organized, change the triaxial stress of application, or change gas pressure；Repairing experiment data.Three axis real simulation of the real-time visual test of coal and gas prominent can be achieved.
Description
Technical field
The invention belongs to technical field of mine safety, in particular, it is visual to be related to a kind of working face driving cause Coal Outburst
Change test method.
Background technique
Coal is the main body of China's energy, bright in national " energy Long-and Medium-term Development planning outline (2004--2020) "
It really points out, China will " adhere to based on coal, centered on electric power, the energy strategy of oil gas and new energy development in an all-round way ".It is aobvious
So, coal industry is the basic industry in China, can health, stablize, sustainable development, be related to national energy security.At me
In state's non-renewable energy consumption structure, coal accounts for about 67%, it is contemplated that the year two thousand fifty will account for 50% or more, and therefore, coal is considerably long
One period in will be always the regnant main energy sources in China.
However, not only causing people with mining industry disaster accidents such as bump, gas, floods and the fire of coal mining
The massive losses and environmental hazard of people's lives and properties, but also the development of coal industry production is restrict, or even entire national warp
The sustainable development of Ji and society.And Gas Disaster accident is the most prominent in mining industry disaster accident, is in China's mining development
Significant problem urgently to be resolved.
Coal and gas prominent is an extremely complex dynamic disaster phenomenon, is underground coal mine coal containing methane gas rock mass in crushing
A kind of strong dynamic process that shape is sharply moved to working face from coal rock layer and sprayed along with a large amount of gas.Coal and gas
In prominent substantial working face tunneling process, the result of stress of coal seam and gas pressure coupling.Therefore, carry out stress with watt
This coupling pressure acts on lower working face tunneling process and disturbs coal seam dynamic test, and can realize that coal and gas are prominent by transparent material
Real-time visual out can provide theory support and Engineering Guidance for the risk identification of coal and gas prominent.
Currently, domestic and foreign scholars have carried out more research in terms of coal and gas prominent protrusion, while having developed a variety of examinations
Experiment device.But it is dynamic to simulate working face driving under true triaxial stress state still to lack a kind of effective experimental rig and method
State disturbs coal seam and causes coal and gas prominent, to study under true triaxial stress state in working face tunneling process parameters to coal
With the influence of Gas Outburst.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of working face driving cause Coal Outburst Visualization side
Method, for studying influence of the parameters to coal and gas prominent in working face tunneling process under true triaxial stress state.
For this purpose, the technical scheme adopted by the invention is as follows: a kind of working face driving cause Coal Outburst Visualization method,
The following steps are included:
Step 1: production experimental rig；
The experimental rig includes the seal cavity of concave, and the recess of the seal cavity is being sealed towards front
Be provided with the transparent box contour, wide with notch portion in front of cavity, rear portion, the top of the transparent box open wide and just with
Notch portion is connected, and the transparent box and seal cavity share same bottom plate, and between the notch portion and transparent box of seal cavity
Left and right is immediately provided with the front pressuring plate of several transparent materials, so that the notch portion of seal cavity be made to constitute test specimen placed cavity；
Each front pressuring plate is equipped with forward press, and forward press passes through transparent box and corresponding preceding pressure from the front to the back
Plate is connected, the respective independent control of the corresponding forward press of each front pressuring plate, and passes through the driving speed of successively unloading simulation working face；
The left side of the test specimen placed cavity, right side, rear side are respectively equipped with one piece of side plate, and the head end of side plate is inserted into seal cavity
Correspondence side wall on, and be provided with air hole for being connected to test specimen placed cavity and seal cavity in head end, every piece of side plate is matched respectively
A side pressure bar is had, side pressure bar ecto-entad passes through seal cavity and is connected with the end of side plate；The test specimen placed cavity and
The inner wall upper limb of transparent box shares same upper padding plate, and front and back is immediately provided with several top boards above the upper padding plate, each
Top board is equipped with upperpush rod, and the end of upperpush rod is using the structure for installing spherical ball between two clamping plates, each upper pressure
The corresponding upperpush rod of plate respectively independent control, and the load different by application, to reflect roof under non-uniform load
Inhomogeneous deformation；
It is provided with fluid entry holes on the side wall of the seal cavity, is provided with Fluid-exiting apertures on the side wall of transparent box；
Step 2: prepare coal dust, and by raw coal crushing grinding to requiring particle size range, pulverized coal sieve after being ground by reciprocating sieve
Divide and is dried for standby；
Step 3: moulded coal test material preparation, coal dust is mixed according to partial size ratio requirement, and addition coal dust is viscous in proportion
It is stirred evenly after knot agent, coal dust loading mold is pressed into the moulded coal test specimen of square block；
Step 4: moulded coal test specimen is installed, the moulded coal test specimen suppressed is put into the test specimen placed cavity of experimental rig；
Step 5: applying triaxial stress, left and right, rear the side pressure bar and forward press, upperpush rod of experimental rig are applied
Add stress, constrains moulded coal test specimen by three axis；
Step 6: applying gas pressure, methane gas is injected into experimental rig by fluid entry holes, methane gas passes through
Air hole left and right, on the side plate of rear enters inside moulded coal test specimen, makes to form certain gas pressure simultaneously inside moulded coal test specimen
It keeps entering in next step after gas injection pressure is constant；
Step 7: being tested, by front pressuring plate from left to right or from right to left according to the stress of setting or change in displacement speed
Rate is successively dropped back to the direction far from moulded coal test specimen, is displaced at left and right, rear side plate and top board different location by recording
Amount obtains coal seam deformation data, while recording the variation of Fluid-exiting apertures gas flow, and whether send out from the forward observation of experimental provision
Raw coal and gas prominent；
Step 8: changing the triaxial stress size of application with other tests are organized, or change gas pressure, repeating step
Four to step 7；
Step 9: repairing experiment data.
As a preferred embodiment of the above solution, in step 1, the front pressuring plate and transparent box are all made of ultra-high strength and toughness degree transparent material
Material pa nurse polycarbonate plate is made, and intensity and toughness are more preferable.
Further preferably, in step 1, the fluid entry holes totally two, it is symmetrical set the rear side in seal cavity
On wall；The Fluid-exiting apertures totally one, it is arranged on the left side wall or right side wall of transparent box；Correspondingly, in step 6, pass through two
A fluid entry holes inject methane gas into experimental rig simultaneously.Using the side of seal cavity rear wall bilateral symmetry influent stream body
Formula can make the Fluid pressure fast and stable for injecting seal cavity, and uniformly across the air hole on the side plate in three orientation
Into test specimen placed cavity, test time is saved, improves test efficiency.
Further preferably, in step 3, the moulded coal test specimen is 600mm × 600mm × 100mm square block, accordingly
Ground, in step 1, the test specimen placed cavity is also 600mm × 600mm × 100mm rectangular cavity.
Further preferably, it in step 2, is dried 22~26 hours after raw coal crushing grinding at 105~110 DEG C.
Beneficial effects of the present invention: to each pressing plate apply stress can three axis stress of primary rock state of real simulation coal seam, apply
Add gas gas source analog gas pressure, working face tunneling process, discharge rate analog are simulated in the gradually unloading of front pressuring plate
Working face driving speed, the displacement variable by obtaining each compression bar obtain moulded coal test piece deformation amount, and can by transparent material
Realize the real-time visual of coal and gas prominent.Present invention utilization can apply the experimental rig of true triaxial stress, and Optimum Experiment
Step, so that digging disturbance test is carried out to moulded coal test specimen, to provide a kind of working face driving cause Coal Outburst visualization
Test method provides theory support and Engineering Guidance for the safety in production of coal mine.
Detailed description of the invention
The overlooking state figure of this experimental rig of Fig. 1.
The A-A cross-sectional view of Fig. 2 Fig. 1.
The B-B cross-sectional view of Fig. 3 Fig. 1.
The end partial enlarged view of Fig. 4 top board.
It is marked in figure as follows: seal cavity 1, transparent box 2, front pressuring plate 3, forward press 4, bottom plate 5, test specimen placed cavity 6, side pressure
Plate 7, side pressure bar 8, upper padding plate 9, top board 10, upperpush rod 11, fluid entry holes 12, Fluid-exiting apertures 13, the first sealing ring 14a,
Two sealing ring 14b, third sealing ring 14c, the 4th gasket 14d, cover board 15, bolt 16, moulded coal test specimen 17.
Specific embodiment
By way of example and in conjunction with the accompanying drawings, the invention will be further described:
A kind of working face driving cause Coal Outburst Visualization method, comprising the following steps:
Step 1: production experimental rig.
In conjunction with shown in Fig. 1-Fig. 3, experimental rig is mainly by seal cavity 1, transparent box 2, front pressuring plate 3, forward press 4, side pressure
Plate 7, side pressure bar 8, upper padding plate 9, top board 10, upperpush rod 11 form.
It is in concave that seal cavity 1 is whole, and the recess of seal cavity 1 is towards front.
The transparent box 2 contour, wide with notch portion is provided in the front of seal cavity 1.Rear portion, the top of transparent box 2
It opens wide and is just connected with notch portion.Transparent box 2 and seal cavity 1 share same bottom plate 5, i.e., transparent box 2 only with it is left,
Right, front side wall.Left and right is immediately provided with the front pressuring plate of several transparent materials between the notch portion and transparent box 2 of seal cavity 1
3, so that the notch portion of seal cavity 1 be made to constitute test specimen placed cavity 6, test specimen placed cavity 6 is for placing moulded coal test specimen 17.
Each front pressuring plate 3 is equipped with forward press 4, and forward press 4 passes through transparent box 2 and corresponding preceding pressure from the front to the back
Plate 3 is connected, each 3 respective independent control of corresponding forward press 4 of front pressuring plate, and passes through the driving speed of successively unloading simulation working face
Degree.Front pressuring plate 3 is all made of transparent material with transparent box 2 and is made, and experimenter can observe the crackle of surface of test piece during the test
Spread scenarios.It is preferred especially with ultra-high strength and toughness degree transparent material pa nurse polycarbonate plate in transparent material, performance is more superior.
The left side of test specimen placed cavity 6, right side, rear side are respectively equipped with one piece of side plate 7, and the head end of side plate 7 is inserted into
On the correspondence side wall of seal cavity 1, air hole 7a is provided with for being connected to test specimen placed cavity 6 and seal cavity in 7 head end of side plate
1.Every piece of side plate 7 is respectively equipped with a side pressure bar 8, and 8 ecto-entad of side pressure bar passes through the end of seal cavity 1 and side plate 7
End is connected.Preferably, side plate 7 is using the structure for setting vertical parting bead in rectangular outer frame, and vertical parting bead is just staggered air hole
7a, so that the fluid in seal cavity 1 be enable to enter test specimen placed cavity 6 by air hole 7a.
Test specimen placed cavity 6 and the inner wall upper limb of transparent box 2 share same upper padding plate 9, and 9 top front and back of upper padding plate is immediately set
It is equipped with several top boards 10.Each top board 10 is equipped with upperpush rod 11, the end of upperpush rod 11 using two clamping plates 11a it
Between install spherical ball 11b structure (as shown in Figure 4), each 10 respective independent control of corresponding upperpush rod 11 of top board, and
By applying different load, to reflect inhomogeneous deformation of the roof under non-uniform load.Since top board 10 is more
Block is closely arranged, therefore adds upper padding plate 9, it is ensured that the leakproofness of test specimen placed cavity 6, and simulate roof and goaf.
It is provided with fluid entry holes 12 on the side wall of seal cavity 1, is passed through stream into seal cavity 1 by fluid entry holes 12
Body；Fluid-exiting apertures 13 are provided on the side wall of transparent box 2, test process medium fluid is discharged through Fluid-exiting apertures 13.Preferably, fluid enters
Totally two, hole 12, is symmetrical set on the rear wall of seal cavity 1；Fluid-exiting apertures 13 totally one, transparent box 2 is set
All may be used on left side wall or right side wall.
In addition, test specimen placed cavity 6 is preferably the long rectangular cavity equal with width.
Bottom plate 5, cover board 15 are fixed by bolt 16 and the side wall of seal cavity 1.It, can for the leakproofness for ensuring experimental rig
To be provided with the first sealing ring 14a using between bottom plate 5 and seal cavity 1, test specimen placed cavity 6；Seal cavity 1 and side pressure bar 8
Between, between seal cavity 1 and side plate 7 be provided with the second sealing ring 14b；Between seal cavity 1 and included cover board 15
It is provided with third sealing ring 14c；The 4th gasket 14d is provided between seal cavity 1 and upper padding plate 9.
Preferably, with front pressuring plate 3 using being threadedly coupled, side pressure bar 8 is used with side plate 7 and is threadedly coupled forward press 4, can also
In a manner of using other be fixedly connected.
Preferably, top board 10 totally seven, the corresponding upperpush rod 11 of each top board 10 is respectively by control independent
Part controls, to reflect roof inhomogeneous deformation；Front pressuring plate 3 totally six, each front pressuring plate 3 corresponding forward press 4 difference
It is controlled by control section independent, and passes through the driving speed of successively unloading simulation working face.
The characteristics of experimental rig:
1, true triaxial stress can be applied from front and rear, left and right and top, and the end of top board uses and pacifies between two clamping plates
The structure for filling spherical ball, by the way that un-uniformly distributed can be applied, thus the heterogeneous deformation of true simulation top plate.
2, front pressuring plate uses the structure of muti-piece combination, and working face tunneling process is simulated by gradually unloading；Top board is adopted
With muti-piece group merge optimization upperpush rod end structure, top board respectively independent control to simulate roof non-uniform load
Load, upper padding plate simulate roof and goaf；Compared to the mode artificially tunneled manually, practical work has been simulated realistically
Condition, to improve test accuracy.
3, test specimen rear side and the pressing plate of arranged on left and right sides are equipped with air hole, can be inflated and be reached to test specimen by fluid entry holes
To must gas pressure, test specimen bottom, front and top are without gas source supply hole, so as to the more true practical work of reflection
Condition improves test accuracy.
4, experimental rig uses sealing structure, can apply related gas pressure, to reflect real working condition.
Step 2: prepare coal dust, and by raw coal crushing grinding to requiring particle size range, pulverized coal sieve after being ground by reciprocating sieve
Divide and is dried for standby.Preferably, it is dried 22~26 hours after raw coal crushing grinding at 105~110 DEG C.
Step 3: moulded coal test material preparation, coal dust is mixed according to partial size ratio requirement, and addition coal dust is viscous in proportion
It is stirred evenly after knot agent, coal dust loading mold is pressed into the moulded coal test specimen of square block.
Preferably, moulded coal test specimen is 600mm × 600mm × 100mm square block, and correspondingly, in step 1, test specimen is placed
Chamber 6 is also 600mm × 600mm × 100mm rectangular cavity.
Step 4: moulded coal test specimen is installed, the moulded coal test specimen suppressed is put into the test specimen placed cavity 6 of experimental rig.
Step 5: applying triaxial stress, to left and right, rear the side pressure bar 8 and forward press 4, upperpush rod of experimental rig
11 apply stress, constrain moulded coal test specimen by three axis.
Step 6: applying gas pressure, methane gas is injected into experimental rig by fluid entry holes 12, methane gas is logical
It crosses air hole 7a left and right, on rear side plate 7 to enter inside moulded coal test specimen, makes to form certain gas inside moulded coal test specimen
Pressure simultaneously keeps gas injection pressure constant rear into next step.It is same by two fluid entry holes 12 when fluid entry holes 12 totally two
When methane gas is injected into experimental rig.
Step 7: being tested, by front pressuring plate 3 from left to right or from right to left according to the stress of setting or change in displacement speed
Rate is successively dropped back to the direction far from moulded coal test specimen, by recording at 10 different location of left and right, rear side plate 7 and top board
Displacement obtains coal seam deformation data, while recording the variation of 13 gas flow of Fluid-exiting apertures, and from the forward observation of experimental provision
Whether coal and gas prominent is occurred.
Step 8: changing the triaxial stress size of application with other tests are organized, or change gas pressure, repeating step
Four to step 7.
For example, by the coal dust of different-grain diameter according to less than 40 mesh: 40~60 mesh: 60~80 mesh: 80~100 mesh: greater than 100
The mixing of mesh=1:1:1:1:1 mass ratio, and add the milky white adhesive that mass ratio is 5% and be pressed into moulded coal test specimen as bonding agent,
Repetition test is carried out according to the following table:
According to carried out shown in upper table repeat test, can study vertical stress in triaxial stress (upperpush rod application stress) with
The relationship of coal and gas prominent.Similarly, the pass for changing other compression bar stress, gas pressures etc. with coal and gas prominent can be studied
System.
Step 9: repairing experiment data.
Claims (5)
1. a kind of working face driving causes Coal Outburst Visualization method, which comprises the following steps:
Step 1: production experimental rig；
The experimental rig includes the seal cavity (1) of concave, and the recess of the seal cavity (1) is towards front, close
It is provided with the transparent box (2) contour, wide with notch portion in front of envelope cavity (1), rear portion, the top of the transparent box (2) are equal
It opens wide and is just connected with notch portion, the transparent box (2) and seal cavity (1) share same bottom plate (5), and seal cavity
(1) left and right is immediately provided with the front pressuring plate (3) of several transparent materials between notch portion and transparent box (2), to make to seal
The notch portion of cavity (1) constitutes test specimen placed cavity (6)；
Each front pressuring plate (3) is equipped with forward press (4), forward press (4) pass through from the front to the back transparent box (2) with it is respective right
The front pressuring plate (3) answered is connected, the respective independent control of each corresponding forward press (4) of front pressuring plate (3), and passes through successively unloading simulation
The driving speed of working face；The left side of the test specimen placed cavity (6), right side, rear side are respectively equipped with one piece of side plate (7), side
The head end of pressing plate (7) is inserted on the correspondence side wall of seal cavity (1), and is provided with air hole (7a) for being connected to test specimen in head end
Placed cavity (6) and seal cavity (1), every piece of side plate (7) are respectively equipped with a side pressure bar (8), side pressure bar (8) ecto-entad
It is connected across seal cavity (1) with the end of side plate (7)；The inner wall upper limb of the test specimen placed cavity (6) and transparent box (2) is total
With same upper padding plate (9), upper padding plate (9) top front and back is immediately provided with several top boards (10), each top board
(10) it is equipped with upperpush rod (11), spherical ball (11b) is installed using between two clamping plates (11a) in the end of upperpush rod (11)
Structure, the respective independent control of each corresponding upperpush rod (11) of top board (10), and by applying different load, with reflection
Inhomogeneous deformation of the roof under non-uniform load；
It is provided with fluid entry holes (12) on the side wall of the seal cavity (1), is provided with Fluid-exiting apertures on the side wall of transparent box (2)
(13)；
Step 2: prepare coal dust, by raw coal crushing grinding to requiring particle size range, after being ground by reciprocating sieve, coal fines screening is simultaneously
It is dried for standby；
Step 3: moulded coal test material preparation, coal dust is mixed according to partial size ratio requirement, and coal dust binder is added in proportion
After stir evenly, coal dust loading mold is pressed into the moulded coal test specimen of square block；
Step 4: moulded coal test specimen is installed, the moulded coal test specimen suppressed is put into the test specimen placed cavity (6) of experimental rig；
Step 5: applying triaxial stress, to left and right, rear the side pressure bar (8) of experimental rig and forward press (4), upperpush rod
(11) apply stress, constrain moulded coal test specimen by three axis；
Step 6: applying gas pressure, methane gas is injected into experimental rig by fluid entry holes (12), methane gas passes through
Air hole (7a) left and right, on rear side plate (7) enters inside moulded coal test specimen, makes to form certain watt inside moulded coal test specimen
This pressure simultaneously keeps gas injection pressure constant rear into next step；
Step 7: being tested, by front pressuring plate (3) from left to right or from right to left according to the stress of setting or change in displacement rate
It successively drops back to the direction far from moulded coal test specimen, by recording left and right, rear side plate (7) and top board (10) different location
Locate displacement, obtain coal seam deformation data, while recording the variation of Fluid-exiting apertures (13) gas flow, and from the front of experimental provision
It sees whether that coal and gas prominent occurs；
Step 8: changing the triaxial stress size of application with other tests are organized, or change gas pressure, repeating step 4 extremely
Step 7；
Step 9: repairing experiment data.
2. working face driving according to claim 1 causes Coal Outburst Visualization method, it is characterised in that: step 1
In, the front pressuring plate (3) is all made of ultra-high strength and toughness degree transparent material pa nurse polycarbonate plate with transparent box (2) and is made.
3. working face driving as claimed in claim 1 or 2 causes coal seam deformation experimental rig, it is characterised in that: in step 1, institute
Fluid entry holes (12) totally two are stated, is symmetrical set on the rear wall of seal cavity (1)；The Fluid-exiting apertures (13) totally one
It is a, it is arranged on the left side wall or right side wall of transparent box (2)；Correspondingly, in step 6, simultaneously by two fluid entry holes (12)
Methane gas is injected into experimental rig.
4. working face driving according to claim 3 causes Coal Outburst Visualization method, it is characterised in that: step 3
In, the moulded coal test specimen is 600mm × 600mm × 100mm square block, correspondingly, in step 1, the test specimen placed cavity
It (6) is also 600mm × 600mm × 100mm rectangular cavity.
5. working face driving according to claim 1 causes Coal Outburst Visualization method, it is characterised in that: step 2
In, it is dried 22~26 hours after raw coal crushing grinding at 105~110 DEG C.
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Cited By (4)
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| CN110308047A (en) * | 2019-07-02 | 2019-10-08 | 中国矿业大学 | A kind of projecting coal bed stress unloading outburst prevention measures and unloading range optimization method |
| CN110847913A (en) * | 2019-11-15 | 2020-02-28 | 辽宁工程技术大学 | Method for judging optimal tunneling speed of roadway with outburst dangerous coal seam |
| CN113567244A (en) * | 2021-07-23 | 2021-10-29 | 山东交通学院 | Positive fault physical simulation test device and method for coal and gas outburst simulation test |
| CN115950746A (en) * | 2022-12-23 | 2023-04-11 | 平顶山天安煤业股份有限公司 | Roadway protection method for gob-side entry retaining of multiple coal seams in real ground stress environment |
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| CN110847913A (en) * | 2019-11-15 | 2020-02-28 | 辽宁工程技术大学 | Method for judging optimal tunneling speed of roadway with outburst dangerous coal seam |
| CN110847913B (en) * | 2019-11-15 | 2021-10-08 | 辽宁工程技术大学 | Method for judging optimal tunneling speed of roadway with outburst dangerous coal seam |
| CN113567244A (en) * | 2021-07-23 | 2021-10-29 | 山东交通学院 | Positive fault physical simulation test device and method for coal and gas outburst simulation test |
| CN113567244B (en) * | 2021-07-23 | 2023-11-10 | 山东交通学院 | Positive fault physical simulation test device and method for coal and gas outburst simulation test |
| CN115950746A (en) * | 2022-12-23 | 2023-04-11 | 平顶山天安煤业股份有限公司 | Roadway protection method for gob-side entry retaining of multiple coal seams in real ground stress environment |
| CN115950746B (en) * | 2022-12-23 | 2023-09-26 | 平顶山天安煤业股份有限公司 | Roadway protection method for multi-coal seam gob-side entry retaining in real ground stress environment |
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