CN109142026A - The influence of coal-bed flooding pressure break, which is adopted, acts lower coal deformation test method - Google Patents
The influence of coal-bed flooding pressure break, which is adopted, acts lower coal deformation test method Download PDFInfo
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- CN109142026A CN109142026A CN201810948174.9A CN201810948174A CN109142026A CN 109142026 A CN109142026 A CN 109142026A CN 201810948174 A CN201810948174 A CN 201810948174A CN 109142026 A CN109142026 A CN 109142026A
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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
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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
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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Abstract
It is adopted the invention discloses a kind of influence of coal-bed flooding pressure break and acts lower coal deformation test method, step are as follows: 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, test specimen placed cavity is left, 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；Prepare coal dust；Moulded coal test material preparation；Moulded coal test specimen and the installation of pressure break pipe；Apply triaxial stress；Apply gas pressure；Hydraulic fracturing；It is tested；With other tests are organized, moulded coal test specimen is replaced, changes the rate of water injection of pressure break pipe；Repairing experiment data.It is tested to carry out coal-bed flooding pressure break with the three axis real simulations for acting lower coal deformation are adopted.
Description
Technical field
The invention belongs to safeties of coal mines and energy extraction technical field, in particular, being related to a kind of coal-bed flooding pressure break shadow
It rings to adopt and acts lower coal deformation test method.
Background technique
The energy is basis and the power of modernization, energy supply and safety concerning China's modernization construction overall situation.In country
In " energy development strategy action plan (2014-2020) ", it is indicated that volume increase and the clean and effective of conventional fossil fuel should be accelerated
It utilizes, meanwhile, Unconventional gas development bottleneck should be broken through as early as possible, promotes gas reserves yield rapid growth, arrive the year two thousand twenty,
At 4,200,000,000 tons or so, shale gas yield strives that, more than 300 billion cubic meters, methane output strives reaching for consumption of coal overall control
300 billion cubic meters.
In conventional fossil fuel and unconventional petroleum resources exploitation, utilized and safety life to take into account the high-efficiency mining of the energy
It produces, waterpower measure becomes one of main direction of studying, however, waterpower measure is to coal petrography due to China's geological structure complexity
The mechanism of action understanding of body internal crack Initiation And Propagation is not goed deep into also.Coal-bed flooding softens coal and rock, reduces rock mass strength,
Change its stress field, cannot such as reach after water filling, which moistens coal seam uniformly, is more advantageous to instead and protrudes.Hydraulic fracturing is formed
Net is stitched, gas porous flow channel is increased, forms new stress concentration region while release, while crustal stress is generated great
Interference can lead to fault activation, and shearing slip, Tectonic earthquake when serious occurs.Therefore, carry out the influence of coal-bed flooding pressure break to adopt
Lower coal deformation and permeability dynamic test are acted on, and can realize the real-time visual of coal and gas prominent by transparent material,
Theory support and Engineering Guidance can be provided for the high-efficiency mining of coal bed gas and the risk identification of mine disaster.
Currently, domestic and foreign scholars coal-bed flooding pressure break influence to adopt act research under in terms of coal deformation focus mostly in
Scene, it is less by laboratory test and theoretical research, still lack a kind of effective experimental rig and method is answered to simulate true triaxial
The influence of coal-bed flooding pressure break, which is adopted, under power state acts lower coal deformation, to study coal-bed flooding pressure under true triaxial stress state
Split the influence to coal deformation.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of influence of coal-bed flooding pressure break to adopt movement lower coal body change
Shape test method, for studying influence of the coal-bed flooding pressure break to coal deformation under true triaxial stress state.
For this purpose, the technical scheme adopted by the invention is as follows: a kind of influence of coal-bed flooding pressure break, which is adopted, acts lower coal deformation
Test method, comprising the following steps:
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
Stirred evenly after knot agent, coal dust loading mold be pressed into the moulded coal test specimen of square block, when compacting in moulded coal test specimen pre-buried bar
Part makes to reserve pressure break hole in moulded coal test specimen；
Step 4: moulded coal test specimen and the installation of pressure break pipe, the test specimen that the moulded coal test specimen suppressed is put into experimental rig is placed
It is intracavitary, it is protruded on front side of pressure break pipe in the pressure break hole of moulded coal test specimen and by pressure break pipe outer wall and pressure break hole inner wall adhering and sealing, it is described
Pressure break pipe passes through front pressuring plate and reaches outside transparent box, and is provided with sealing ring between pressure break pipe and front pressuring plate, transparent box；
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: hydraulic fracturing, injects high pressure water into moulded coal test specimen by pressure break pipe, until pressure break part coal body；
Step 8: 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, has no obvious deformation and occurs watt through front pressuring plate and transparent box observation moulded coal test specimen front surface
This is protruded, while recording the variation of Fluid-exiting apertures gas flow；
Step 9: replacing moulded coal test specimen with other tests are organized, step 4 is repeated to step 8, it is logical to be often repeated once change
Pressure break pipe is crossed to the rate of water injection of moulded coal test specimen until pressure break part coal body.
Step 10: repairing experiment data.
As a preferred embodiment of the above solution, in step 1, the fluid entry holes totally two, it is symmetrical set in seal cavity
Rear wall on；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,
Methane gas is injected into experimental rig simultaneously by two fluid entry holes.Using seal cavity rear wall bilateral symmetry influent stream body
Mode, the Fluid pressure fast and stable for injecting seal cavity can be made, and uniformly across saturating on the side plate in three orientation
Stomata enters test specimen placed cavity, saves test time, improves test efficiency.
Further preferably, in step 3, the moulded coal test specimen is 600mm × 600mm × 100mm square block, pre-buried
Rod piece diameter is 10mm；Correspondingly, in step 1, the test specimen placed cavity is also 600mm × 600mm × 100mm rectangular cavity,
The outer diameter of pressure break pipe is 10mm.
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
The real-time visual for realizing coal and gas prominent changes while by replacement moulded coal test specimen and passes through pressure break pipe to moulded coal test specimen
Rate of water injection until pressure break part coal body, so that providing a kind of coal-bed flooding pressure break influence adopts movement lower coal deformation examination
Proved recipe 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, pressure break pipe 18.
Specific embodiment
By way of example and in conjunction with the accompanying drawings, the invention will be further described:
A kind of influence of coal-bed flooding pressure break, which is adopted, acts lower coal deformation test 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 and goaf；Compared to the mode artificially tunneled manually, actual condition is simulated realistically, to improve test essence
Degree.
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.When compacting in moulded coal test specimen pre-buried bar
Part makes to reserve pressure break hole in moulded coal test specimen.
Preferably, moulded coal test specimen is 600mm × 600mm × 100mm square block, and pre-buried rod piece diameter is 10mm；Accordingly
Ground, in step 1, test specimen placed cavity 6 is also 600mm × 600mm × 100mm rectangular cavity, and the outer diameter of pressure break pipe 18 is 10mm.
Step 4: moulded coal test specimen and the installation of pressure break pipe, the test specimen that the moulded coal test specimen suppressed is put into experimental rig is placed
In chamber 6, protruded on front side of pressure break pipe 18 in the pressure break hole of moulded coal test specimen and by 18 outer wall of pressure break pipe and pressure break hole inner wall adhering and sealing,
Pressure break pipe 18 passes through front pressuring plate 3 and reaches outside transparent box 2, and sealing is provided between pressure break pipe 18 and front pressuring plate 3, transparent box 2
Circle.
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: hydraulic fracturing, injects high pressure water into moulded coal test specimen by pressure break pipe 18, until pressure break part coal body；
Step 8: 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, moulded coal test specimen front surface, which is observed, through front pressuring plate 3 and transparent box 2 has no obvious deformation simultaneously
Gas Outburst occurs, while recording the variation of 13 gas flow of Fluid-exiting apertures.
Step 9: replacing moulded coal test specimen with other tests are organized, step 4 is repeated to step 8, it is logical to be often repeated once change
Pressure break pipe 18 is crossed to the rate of water injection of moulded coal test specimen until pressure break part coal body.
Step 10: repairing experiment data.
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 repeating to test shown in upper table, coal seam hydraulic fracturing can be studied and adopt the relationship for acting lower coal deformation.
Claims (4)
1. a kind of coal-bed flooding pressure break influence, which is adopted, acts lower coal deformation test 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, when compacting in moulded coal test specimen pre-buried rod piece, make
Pressure break hole is reserved in moulded coal test specimen；
Step 4: the moulded coal test specimen suppressed, is put into the test specimen placed cavity (6) of experimental rig by moulded coal test specimen and the installation of pressure break pipe
It is interior, it is protruded on front side of pressure break pipe (18) in the pressure break hole of moulded coal test specimen and pressure break pipe (18) outer wall is Nian Jie with pressure break hole inner wall close
Envelope, the pressure break pipe passes through front pressuring plate (3) and reaches transparent box (2) outside, and pressure break pipe (18) and front pressuring plate (3), transparent box (2)
Between be provided with sealing ring；
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: hydraulic fracturing, injects high pressure water into moulded coal test specimen by pressure break pipe (18), until pressure break part coal body；
Step 8: 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, observing moulded coal test specimen front surface through front pressuring plate (3) and transparent box (2), whether there is or not obvious
Gas Outburst is deformed and occurred, while recording the variation of Fluid-exiting apertures (13) gas flow；
Step 9: replacing moulded coal test specimen with other tests are organized, repeating step 4 to step 8, be often repeated once change and pass through pressure
Pipe (18) is split to the rate of water injection of moulded coal test specimen until pressure break part coal body；
Step 10: repairing experiment data.
2. coal-bed flooding pressure break influence according to claim 1, which is adopted, acts lower coal deformation test method, feature exists
In: in step 3, the moulded coal test specimen is 600mm × 600mm × 100mm square block, and pre-buried rod piece diameter is 10mm；Accordingly
Ground, in step 1, the test specimen placed cavity (6) is also 600mm × 600mm × 100mm rectangular cavity, the outer diameter of pressure break pipe (18)
For 10mm.
3. coal-bed flooding pressure break influence according to claim 1, which is adopted, acts lower coal deformation test method, feature exists
In: in step 2, dried 22~26 hours after raw coal crushing grinding at 105~110 DEG C.
4. coal-bed flooding pressure break influence as described in claim 1, which is adopted, acts lower coal deformation test method, it is characterised in that:
In step 1, the fluid entry holes (12) totally two are symmetrical set on the rear wall of seal cavity (1)；The fluid
Portal (13) totally one, is arranged on the left side wall or right side wall of transparent box (2)；Correspondingly, in step 6, pass through two fluids
Enter hole (12) while injecting methane gas into experimental rig.
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| CN109752249A (en) * | 2019-01-22 | 2019-05-14 | 北京交通大学 | The sealing device and encapsulating method of sample and slip casting pedestal in three axis muddy water diametral compression tests |
| CN110308246A (en) * | 2019-07-02 | 2019-10-08 | 中国矿业大学 | The projecting coal bed water filling extinction technology of one kind and extinction validity check method |
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| CN109752249B (en) * | 2019-01-22 | 2024-02-27 | 北京交通大学 | Sealing device and sealing method for sample and grouting base in triaxial mud water splitting test |
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| CN110308246B (en) * | 2019-07-02 | 2020-09-01 | 中国矿业大学 | Outburst elimination technology for water injection of outburst coal seam and outburst elimination effect test method |
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| CN110646583B (en) * | 2019-10-09 | 2022-02-22 | 中煤科工集团重庆研究院有限公司 | Method and device for coal seam water injection similar simulation test |
| WO2021179337A1 (en) * | 2020-03-09 | 2021-09-16 | 山东科技大学 | Coal rock water infusion wetting-based pressure relief and bump prevention test method under true three-dimensional stress |
| CN113309513A (en) * | 2021-06-08 | 2021-08-27 | 中国地质大学（北京） | Large-scale multi-scale deep coal bed gas exploitation test device |
| CN115343164A (en) * | 2022-08-17 | 2022-11-15 | 中国石油大学(华东) | Rock true triaxial lateral pressure loading device |
| CN116087459B (en) * | 2022-12-23 | 2023-09-19 | 重庆大学 | Liquid carbon dioxide punching fracturing coal seam simulation test system |
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