CN114544370B - Experimental device and experimental method for simulating tunnel coal and gas outburst axial pressure loading - Google Patents
Experimental device and experimental method for simulating tunnel coal and gas outburst axial pressure loading Download PDFInfo
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- CN114544370B CN114544370B CN202210177227.8A CN202210177227A CN114544370B CN 114544370 B CN114544370 B CN 114544370B CN 202210177227 A CN202210177227 A CN 202210177227A CN 114544370 B CN114544370 B CN 114544370B
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- 239000003245 coal Substances 0.000 title claims abstract description 31
- 238000002474 experimental method Methods 0.000 title abstract description 8
- 239000011435 rock Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 32
- 239000010959 steel Substances 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 31
- 238000004088 simulation Methods 0.000 description 7
- 238000011160 research Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- 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
- G01N2203/0042—Pneumatic or hydraulic means
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
An experimental device and a method for simulating tunnel coal and gas outburst axial pressure loading, wherein the device comprises: the first sub-component is of a cylindrical structure with a cylindrical cavity penetrating through the front and the back, the included angle between the end face of the front end of the first sub-component and the central axis of the cylindrical cavity is 45-90 degrees, and the front end of the first sub-component is contacted with a rock wall to be tested; the second sub-part is provided with a cylindrical cavity with only one end being open and matched with the outer peripheral surface of the first sub-part, the first sub-part is sleeved and fixed in the cylindrical cavity, and the front end surface of the first sub-part leaks outside the opening of the second sub-part; a high pressure resistant sealed bag disposed within the cylindrical cavity of the first sub-assembly; a pressurized source in communication with the high pressure resistant seal bag through a conduit for providing a medium to expand the high pressure resistant seal bag. The invention can adjust the size of the cylindrical cavity according to the requirement so as to reduce the boundary effect better, thereby meeting the requirement of similar experiments.
Description
Technical Field
The invention relates to the field of coal and gas outburst simulation test devices, in particular to a tunnel coal and gas outburst simulation axial pressure loading test device and a tunnel coal and gas outburst simulation axial pressure loading test method.
Background
Coal seam gas is one of the major geological disasters in tunnel construction, and various tunnels are continuously built and newly built by stars and chess, such as high-speed railway lines, high-grade highway lines and the like along with the acceleration of the infrastructure of engineering facilities, especially the implementation of strategically large development of the middle part and the west part. The number of tunnels is increased, the length is increased, the tunnel passes through the coal-bearing stratum is increased, the burial depth is increased, and the tunnels can become protruding tunnels for coal and gas. With the great development of highway construction, more and more tunnels need to pass through coal-bearing stratum or natural gas-rich stratum, and gas tunnels gradually become key projects and key projects for controlling highway safety construction.
However, the occurrence mechanism of coal and gas outburst is very complex, and on-site monitoring, theoretical research and numerical simulation research means are difficult to be qualified; dangerous is monitored on site, the condition is single, and system research is difficult to develop; the theory research is difficult, and the mechanism is unclear, so that a quantitative model is difficult to build; moreover, the numerical simulation distortion is serious, and the simulation result is distorted due to the lack of a mechanism model.
Therefore, a simulation test model with adjustable parameters, controllable process, repeatable results and data acquisition is needed, which is convenient for researching the generator with prominent coal and gas.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides an experimental device and an experimental method for simulating tunnel coal and gas outburst axial pressure loading, and the experimental device can adjust the size of a cylindrical cavity according to requirements so as to better reduce boundary effects, thereby meeting the requirements of similar experiments.
In order to achieve the above object, the present invention provides an experimental device for simulating tunnel coal and gas protrusion axial pressure loading, comprising:
The first sub-component is of a cylindrical structure with a cylindrical cavity penetrating through the front and back, the included angle between the front end face of the first sub-component and the central axis of the cylindrical cavity is 45-90 degrees, and the front end of the first sub-component is used for being in contact with a rock wall to be tested;
The second sub-part is provided with a cylindrical cavity with only one end being open and matched with the outer peripheral surface of the first sub-part, the first sub-part is sleeved and fixed in the cylindrical cavity, and the front end face of the first sub-part leaks outside the opening of the second sub-part;
the high-pressure-resistant sealing bag is arranged in the cylindrical cavity of the first sub-part and used for generating pressure to act on the test rock wall to be tested through the front end opening of the first sub-part when expanding;
A pressure sensor disposed on the second component for monitoring pressure changes of the high pressure resistant sealed bag; and
A pressurized source in communication with the high pressure resistant seal bag through a conduit for providing a medium to expand the high pressure resistant seal bag.
As a further preferable technical scheme of the invention, the second part comprises a plurality of arc-shaped steel plates, the cylindrical cavity is formed by encircling the arc-shaped steel plates, and the interval between any two adjacent arc-shaped steel plates is adjustable.
As a further preferable technical scheme of the invention, a plurality of arc-shaped steel plates are sequentially connected around the periphery of the cylindrical cavity, two adjacent arc-shaped steel plates are locked by a movable bolt, and the distance between the two adjacent arc-shaped steel plates can be adjusted by the movable bolt.
As a further preferable technical scheme of the invention, the arc-shaped steel plate is provided with an arc-shaped body and a connecting part which is arranged at the edge of the arc-shaped body in an outward bending way, and the movable bolt is connected to the connecting part.
As a further preferable technical scheme of the invention, the sealing end of the cylindrical cavity is provided with the fan-shaped movable fixed steel plates which are connected with each arc-shaped steel plate in a one-to-one correspondence manner, the sealing end is formed by splicing the fan-shaped movable fixed steel plates, and a pipeline connected with the high-pressure-resistant sealing bag penetrates through the sealing end and extends to the outside of the cylindrical cavity.
As a further preferable aspect of the present invention, the medium is gas or liquid, and the pressurizing source is a high-pressure gas storage tank that supplies high-pressure gas, or a high-pressure liquid storage tank that supplies high-pressure liquid.
As a further preferable technical scheme of the invention, the first sub-component and the second sub-component are connected through a buckle.
As a further preferable aspect of the present invention, a pump as a power transmission device is further provided in the pipe between the pressurization source and the high-pressure resistant sealing bag.
According to another scheme of the invention, the invention also provides a test method for simulating the tunnel coal and gas outburst axial pressure loading test device, which comprises the following steps:
step 1), connecting a first sub-part in the second sub-part in a sleeved mode, arranging a high-pressure-resistant sealing bag in a cylindrical cavity of the first sub-part, and communicating a pressurizing source with the high-pressure-resistant sealing bag through a pipeline;
step 2), the open side of the second sub-part faces the test rock wall to be tested, and the first sub-part leaks outside the front end part of the second sub-part and is clung to the surface of the test rock wall;
Step 3), providing a pressurizing medium by a pressurizing source to expand the high-pressure-resistant sealing bag in the cylindrical cavity of the first sub-part, monitoring the pressure change of the high-pressure-resistant sealing bag in real time by a pressure sensor until the test rock wall is extruded and damaged by the expanded high-pressure-resistant sealing bag, and recording stress experimental data and strain experimental data of wall fracture;
as a further preferable technical scheme of the invention, the test rock wall is also stuck with a strain gauge.
According to the experimental device and the experimental method for simulating the axial pressure loading of tunnel coal and gas outburst, the following beneficial effects can be achieved by adopting the technical scheme:
1) According to the invention, the cylindrical cavity with different inner diameter sizes can be matched with the first sub-parts with different outer diameter sizes, so that the size of the cylindrical cavity can be adjusted according to requirements to reduce boundary effects better, and the requirements of similar experiments are met.
2) The first and second parts of the invention have larger rigidity and bearing capacity, so that local stress concentration is avoided when bearing pressure, and meanwhile, the pressure distribution is more uniform by using the high-pressure-resistant bag made of flexible materials, so that the stress concentration phenomenon is further reduced.
3) The experimental device for simulating the tunnel coal and gas outburst axial pressure loading simplifies an experimental system, improves the effective space utilization rate of the experimental device, and ensures that sufficient space is reserved in the cylindrical cavity for storing high-pressure gas or liquid for improving the effective space utilization rate of the experimental device, thereby ensuring sufficient air or liquid outside the first and second parts and being beneficial to restoring the migration process of far-field gas to the outburst area under the real condition.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of an example of an experimental setup for simulating tunnel coal and gas projection axial pressure loading according to the present invention;
FIG. 2 is a schematic diagram of another example provided by the experimental device for simulating tunnel coal and gas projection axial pressure loading according to the present invention;
FIG. 3 is a schematic view of the first component of FIG. 2;
FIG. 4 is a schematic diagram of an example of the provision of a second component;
fig. 5 is a schematic cross-sectional view of the second component of fig. 4.
In the figure: 1. the device comprises a pressurizing source, 2, a pipeline, 3, a pump, 4, a second sub-component, 41, an arc-shaped steel plate, 42, a fan-shaped movable fixed steel plate, 43, a movable bolt, 5, a first sub-component, 6 and a pressure sensor.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The invention will be further described with reference to the drawings and detailed description. The terms such as "upper", "lower", "left", "right", "middle" and "a" as used in the preferred embodiments are merely for descriptive purposes and not for limiting the scope of the invention, but rather for changing or adjusting the relative relationship without materially altering the technical content thereof.
As shown in fig. 1 and 2, the invention provides an experimental device for simulating tunnel coal and gas outburst axial pressure loading, which comprises a first sub-part 5, a second sub-part 4, a high-pressure resistant sealing bag, a pressure sensor 6, a pressurizing source 1 and a pipeline 2, wherein:
Referring to fig. 3, the first sub-component 5 is in a cylindrical structure with a cylindrical cavity penetrating through the front and back, the included angle between the end surface of the front end of the first sub-component 5 and the central axis of the cylindrical cavity is 45-90 degrees, only the first sub-component 5 in fig. 1 and fig. 2 is different in structure, the front end surface of the first sub-component 5 in fig. 1 is perpendicular to the central axis of the first sub-component, the front end surface of the first sub-component 5 in fig. 2 has an inclined angle smaller than 90 degrees with the central axis of the first sub-component, the front end of the first sub-component 5 is used for contacting with a test rock wall to be tested, and according to different test requirements, the first sub-component 5 with different inclined angles can be selected, so that different pressure loading on the test rock wall to be tested can be realized;
Referring to fig. 4 and 5, the second sub-component 4 is provided with a cylindrical cavity with only one end being open and matched with the outer peripheral surface of the first sub-component 5, the first sub-component 5 is fixedly sleeved in the cylindrical cavity, the front end surface of the first sub-component leaks outside the opening of the second sub-component, the first sub-component 5 is connected with the second sub-component 4 through a buckle, the inner diameter of the cylindrical cavity of the second sub-component 4 is adjustable, and the cylindrical cavities with different inner diameter sizes are used for matching with the first sub-components 5 with different outer diameter sizes;
The high-pressure-resistant sealing bag is arranged in a cylindrical cavity of the first sub-component 5, is made of flexible materials, is inflated by filling high-pressure medium into the high-pressure-resistant sealing bag, and is used for changing the direction of loading pressure and acting on a test rock wall to be tested through the pressure generated by the front end opening of the first sub-component 5, so that the axial pressure loading of the test rock wall to be tested is realized;
A pressure sensor 6 is provided on the second component for monitoring the pressure change of the high pressure resistant sealed bag;
The pressurizing source 1 is communicated with the high-pressure-resistant sealing bag through a pipeline 2, a pump 3 serving as a power transmission device is further arranged in the pipeline 2, the pressurizing source 1 provides a medium under the power transmission of the pump 3 so as to generate pressure after the high-pressure-resistant sealing bag is expanded, the medium can be selected as gas (such as carbon dioxide or nitrogen) or liquid (such as water) according to experimental requirements, and the pressurizing source 1 is a high-pressure gas storage tank for providing high-pressure gas or a high-pressure liquid storage tank for providing high-pressure liquid.
In a specific implementation, a valve, a flow meter or a pressure gauge may be further provided on the pipe 2 according to the requirements, so as to monitor the medium flowing in the pipe 2.
In one embodiment, the second part 4 includes a plurality of arc-shaped steel plates 41, the cylindrical chamber is formed by enclosing a plurality of arc-shaped steel plates 41, and the interval between any two adjacent arc-shaped steel plates 41 is adjustable. The plurality of arc-shaped steel plates 41 are sequentially connected around the periphery of the cylindrical cavity, two adjacent arc-shaped steel plates 41 are locked through movable bolts 43, and the distance between the two adjacent arc-shaped steel plates 41 can be adjusted through the movable bolts 43.
Preferably, the arc-shaped steel plate 41 has an arc-shaped body and a connecting portion bent outwards at the edge of the arc-shaped body, and the movable bolt 43 is connected to the connecting portion.
Further preferably, the sealing end of the cylindrical cavity is provided with a fan-shaped movable fixed steel plate 42 connected with each arc-shaped steel plate 41 in a one-to-one correspondence manner, the sealing end is formed by splicing the fan-shaped movable fixed steel plates 42, and the pipeline 2 connected with the high-pressure-resistant sealing bag penetrates through the sealing end and extends to the outside of the cylindrical cavity.
The invention also provides a test method for simulating the tunnel coal and gas outburst axial pressure loading test device, which comprises the following steps:
step 1), connecting a first sub-part in the second sub-part in a sleeved mode, arranging a high-pressure-resistant sealing bag in a cylindrical cavity of the first sub-part, and communicating a pressurizing source with the high-pressure-resistant sealing bag through a pipeline;
step 2), the open side of the second sub-part faces the test rock wall to be tested, strain gauges are attached to the test rock wall, and the first sub-part leaks out of the front end of the second sub-part and is clung to the surface of the test rock wall;
Step 3), providing a pressurizing medium by a pressurizing source to expand the high-pressure-resistant sealing bag in the cylindrical cavity of the first sub-part, monitoring the pressure change of the high-pressure-resistant sealing bag in real time by a pressure sensor until the test rock wall is extruded and damaged by the expanded high-pressure-resistant sealing bag, and recording stress experimental data and strain experimental data of wall fracture;
as a further preferable technical scheme of the invention, the test rock wall is also stuck with a strain gauge.
The experimental device for simulating the axial pressure loading of the tunnel coal and the gas protrusion, which is applied to the experimental device for simulating the axial pressure loading of the tunnel coal and the gas protrusion, has the following advantages:
1) The cylindrical chamber of the present embodiment can be matched with the first sub-unit 5 of different outer diameter sizes by different inner diameter sizes, so that the size of the cylindrical chamber can be adjusted according to the requirement to reduce the boundary effect better, thereby meeting the requirement of similar experiments.
2) The first sub 5 and the second sub 4 of this embodiment have larger rigidity and bearing capacity, so as to avoid local stress concentration during bearing pressure, and meanwhile, the high-pressure resistant bag made of flexible materials can make pressure distribution more uniform, so that stress concentration phenomenon is further effectively reduced.
3) According to the embodiment, an experimental system is simplified, the effective space utilization rate of the experimental device is improved, sufficient space is reserved in the cylindrical cavity and can be used for storing high-pressure gas or liquid, the effective space utilization rate of the experimental device is improved, the sufficiency of the external gas or liquid of the first and second parts is ensured, and the process of moving far-field gas to the protruding area under the real condition is reduced.
While particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined only by the appended claims.
Claims (9)
1. An experimental device for simulating tunnel coal and gas outburst axial pressure loading, which is characterized by comprising:
The first sub-component is of a cylindrical structure with a cylindrical cavity penetrating through the front and back, the included angle between the front end face of the first sub-component and the central axis of the cylindrical cavity is 45-90 degrees, and the front end of the first sub-component is used for being in contact with a rock wall to be tested;
The second sub-part is provided with a cylindrical cavity with only one end being open and matched with the outer peripheral surface of the first sub-part, the first sub-part is sleeved and fixed in the cylindrical cavity, and the front end face of the first sub-part leaks outside the opening of the second sub-part; the second sub-part comprises a plurality of arc-shaped steel plates, the cylindrical cavity is formed by encircling the arc-shaped steel plates, and the interval between any two adjacent arc-shaped steel plates is adjustable;
the high-pressure-resistant sealing bag is arranged in the cylindrical cavity of the first sub-part and used for generating pressure to act on the test rock wall to be tested through the front end opening of the first sub-part when expanding;
A pressure sensor disposed on the second component for monitoring pressure changes of the high pressure resistant sealed bag; and
A pressurized source in communication with the high pressure resistant seal bag through a conduit for providing a medium to expand the high pressure resistant seal bag.
2. The experimental device for simulating tunnel coal and gas outburst axial pressure loading according to claim 1, wherein a plurality of arc-shaped steel plates are sequentially connected around the periphery of the cylindrical chamber, two adjacent arc-shaped steel plates are locked by a movable bolt, and the distance between the two adjacent arc-shaped steel plates can be adjusted by the movable bolt.
3. The experimental device for simulating tunnel coal and gas projection axial pressure loading according to claim 2, wherein the arc-shaped steel plate is provided with an arc-shaped body and a connecting part which is arranged by bending outwards at the edge of the arc-shaped body, and the movable bolt is connected to the connecting part.
4. The experimental device for simulating tunnel coal and gas outburst axial pressure loading according to claim 3, wherein a fan-shaped movable fixed steel plate connected with each arc-shaped steel plate in a one-to-one correspondence manner is arranged at the sealing end of the cylindrical chamber, the sealing end is formed by splicing the fan-shaped movable fixed steel plates, and a pipeline connected with the high-pressure-resistant sealing bag extends to the outside of the cylindrical chamber through the sealing end.
5. The simulated tunnel coal and gas projection axial pressure loading experimental apparatus of claim 1 wherein said medium is a gas or liquid and said pressurized source is a high pressure gas storage tank providing high pressure gas or a high pressure liquid storage tank providing high pressure liquid.
6. The simulated tunnel coal and gas projection axial pressure loading experimental device of claim 1, wherein said first and second parts are connected by a snap fit.
7. A simulated tunnel coal and gas projection axial pressure loading experimental device as claimed in any one of claims 1-6, further provided with a pump as a power transmission means in the conduit between said pressurized source and said high pressure resistant sealed bag.
8. A test method for simulating a tunnel coal and gas outburst axial pressure loading test apparatus according to any one of claims 1 to 7, comprising the steps of:
1) The first sub-part is sleeved in the second sub-part, the high-pressure-resistant sealing bag is arranged in the cylindrical cavity of the first sub-part, and the pressurizing source is communicated with the high-pressure-resistant sealing bag through a pipeline;
2) The open side of the second sub-part faces the test rock wall to be tested, and the first sub-part leaks outside the front end part of the second sub-part and is clung to the surface of the test rock wall;
3) And providing a pressurizing medium by a pressurizing source to enable the high-pressure-resistant sealing bag to expand in the cylindrical cavity of the first sub-part, monitoring the pressure change of the high-pressure-resistant sealing bag in real time by a pressure sensor until the test rock wall is extruded and damaged by the expanded high-pressure-resistant sealing bag, and recording stress experimental data and strain experimental data of wall fracture.
9. The method of claim 8, wherein the test wall is further provided with strain gauges.
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