CN111551692A - Experimental device and method for inducing coal and gas outburst through stable pressure difference two-stage linkage - Google Patents
Experimental device and method for inducing coal and gas outburst through stable pressure difference two-stage linkage Download PDFInfo
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Abstract
The invention discloses an experimental device and method for inducing coal and gas outburst through stable differential pressure two-stage linkage. The device comprises a protruding experiment box body, a first rupture disk, a second rupture disk, a first air pressure adjusting mechanism and a second air pressure adjusting mechanism. A protruding cavity opening is formed in one side wall of the protruding experiment box body, and the first rupture disk and the second rupture disk are respectively installed on the outer end opening and the inner end opening of the protruding cavity opening and used for plugging corresponding end openings. The first air pressure adjusting mechanism is used for supplying air into the protrusion experiment box body and adjusting air pressure of the supplied air, and the second air pressure adjusting mechanism is used for supplying air into the protrusion cavity opening and adjusting air pressure of the supplied air. The invention utilizes the protruding experiment box body and the loaded experiment coal body with known volumes to complete the experiment induced outburst by the atmospheric pressure, the protruding cavity opening and the pressure in the protruding experiment box body through two groups of rupture discs and the combination of the burst pressure under the three-dimensional stress combination and the high-pressure simulated gas adsorption state.
Description
Technical Field
The invention relates to an experimental device and method for inducing coal and gas outburst through stable differential pressure two-stage linkage.
Background
Coal and gas outburst (hereinafter referred to as outburst) is one of the most frequent accident types in coal mine disasters in China, and deep gas dynamic disasters become more and more serious along with the accelerated development of coal mining depth. The method is a complex gas-solid coupling process, and intensively reflects the local dynamic instability phenomenon induced by external load disturbance of an overpressure coal bed under a specific stress condition.
According to accident investigation statistics, the cave shapes formed by the protruded coal bodies have larger difference, and various cave shapes with small mouths and large cavities, such as pear-shaped, tongue-shaped, gourd-shaped, dendritic and the like, are presented. The diverse cavern structures led researchers to study the mechanism of the prominent dynamic cavitation, wherein many researchers believe that the tectonic stress effect, especially the horizontal tectonic stress property, determines the shape of the prominent cavern and controls the prominent scale. Physical simulation experiments are important means for researching stress control and highlighting development mechanism.
Aiming at the horizontal stress control experiment research formed by the cave in the coal body, the xujiang et al analyzes the control of the outburst strength of coal and gas by different confining pressure and gas pressure and different outburst caliber sizes through an improved simulation experiment platform, and further influences the scale of the cave, which is a great progress of the outburst physical simulation. However, the outburst occurrence mechanism and the influence of the coal bed gas pressure on the development of the cave are still technical problems, which are one of the difficulties in mining induced outburst physical simulation.
The Tang-Jupeng and the Chua successfully adopt a jet flow theory and a similar simulation means respectively to realize three-dimensional physical experiment simulation, and make certain progress in the aspects of coal pulverization and cavity formation rules, but do not deeply research the protruding dynamic cavitation process and the protruding starting condition. Gazan et al studied the contribution of gas pressure to the outburst under the gas adsorption equilibrium condition by injecting high pressure gas into the test coal sample, but did not perform experimental verification on the pressure boundary or extreme value condition of the outburst start.
High-pressure pneumatic induction is a new experimental means, which has been paid attention to by scholars at home and abroad, however, the development of high-efficiency control technology and experimental equipment is still a bottleneck restricting experimental simulation. Although some domestic scholars try to induce the outburst simulation by adopting a rupture disk method, effective theory and technical support are lacked for the outburst starting control of the simulation experiment, so that the success rate of the experiment is extremely low.
In summary, the analysis of the development mechanism of coal and gas outburst, the relationship between the pressure condition and the pressure difference at the outburst start is an indispensable research content. However, the current simulation means and experimental platform at home and abroad can not achieve the purpose of the test, so the research progress of the prominent mechanism is severely restricted, and the research and development of a new device and a new process for prominently inducing simulation are urgently needed.
Disclosure of Invention
The invention aims to provide an experimental device for inducing coal and gas outburst by stable pressure difference two-stage linkage, so as to realize the induction of the coal and gas outburst and ensure the safety and controllability of the coal and gas outburst.
In order to achieve the purpose, the invention adopts the following technical scheme:
an experimental device for inducing coal and gas outburst by stable pressure difference secondary linkage comprises:
a protruding cavity opening is formed in one side wall of the box body;
the first rupture disk is arranged at the outer port of the protruding cavity opening and used for plugging the outer port of the protruding cavity opening;
the second rupture disk is arranged at the inner port of the protruding cavity port and used for plugging the inner port of the protruding cavity port;
the first air pressure adjusting mechanism is configured to supply air into the protrusion experiment box and adjust air pressure of the supplied air; and
a second air pressure adjusting mechanism configured to supply air into the protruding cavity opening and adjust air pressure of the supplied air;
wherein, the protruding cavity opening and the protruding experiment box body are both closed spaces;
and the critical pressure difference of the first rupture disk during blasting is greater than that of the second rupture disk during blasting.
Preferably, the protruding test chamber is rectangular and made of stainless steel.
Preferably, the protrusion cavity is in a circular truncated cone shape, and the diameter of the inner port of the protrusion cavity is larger than that of the outer port.
Preferably, the first air pressure adjusting mechanism comprises a high-pressure air source and an air guide pipe;
the high-pressure air source is connected with one end of the air duct, and the other end of the air duct extends into the protruding experiment box body;
the air duct is provided with a control valve and a pressure sensor.
Preferably, the bottom protruding out of the experimental box body is provided with an air guide groove;
the air duct extends into the protruding experiment box body and is communicated with the air guide groove.
Preferably, the second air pressure adjusting mechanism comprises a high-pressure air source and an air guide pipe;
the high-pressure air source is connected with one end of the air duct, and the other end of the air duct extends into the protruding cavity;
the air duct is provided with a control valve and a pressure sensor.
Preferably, the pressure-bearing range of the first rupture disk is 0.5-10.0 MPa, and the pressure-bearing range of the second rupture disk is 0.3-6.0 MPa
In addition, the invention also provides an experimental method for inducing coal and gas outburst by secondary linkage of stable pressure difference, which is based on the experimental device for inducing coal and gas outburst by secondary linkage of stable pressure difference, and the specific scheme is as follows:
an experimental method for inducing coal and gas outburst by stable differential pressure two-stage linkage comprises the following steps:
I. completing structural arrangement of a loaded experimental coal body and a sensing device in the outburst experimental box body;
II, after the air tightness of the protrusion experiment box body is checked, the air pressure loading in the protrusion experiment box body is realized by utilizing a first air pressure adjusting mechanism; meanwhile, a three-way stress loading mechanism is used for loading three-way stress in the protrusion experiment box body;
setting loading rates of different stresses and gas injection rates, and stabilizing the stress when the loading stress reaches 60% -70% of a preset stress value; completing 50% of the critical pressure value of the second rupture disk according to the critical pressure of the second rupture disk;
when gas is injected into the protrusion experiment box body, gas is injected into the protrusion cavity by using the second air pressure adjusting mechanism, and when the gas pressure in the protrusion cavity reaches a set air pressure value in the protrusion cavity during the experiment, the pressure is stabilized;
III, continuously completing synchronous loading of three-dimensional stress according to experimental simulation requirements, and achieving a preset stress state; carrying out stress strain, air pressure and temperature parameter pre-stress test and maintaining stability; then, the first air pressure adjusting mechanism continues to inject experimental gas into the protruding experiment box until the set air pressure value in the protruding experiment box is reached during the experiment, and the pressure is stabilized;
IV, after the stress and air pressure loading balance is completed, continuously injecting air into the protruding cavity opening by the second air pressure adjusting mechanism according to a set speed, and confirming the experimental equipment and the experimental environment again after the pressure reaches 80% of the critical pressure value of the second rupture disk;
v. the second air pressure adjusting mechanism timely and continuously injects gas into the protruding cavity until the first rupture disk is started to explode, the second rupture disk is immediately linked to explode, a power phenomenon occurs, and the protruding induction experiment is completed.
The invention has the following advantages:
according to the method, the protrusion is induced by adopting high-pressure and low-pressure linkage control, wherein the external high-pressure rupture disc (the first rupture disc) can effectively guarantee the safety of an experiment and the controllability of the experiment progress, the internal low-pressure rupture disc (the second rupture disc) is selected according to the characteristics of the internal air pressure of an experiment coal body and the three-dimensional stress loading path of the experiment, quantitative calculation can be realized, the method can fully utilize the rated pressure difference to control the protrusion induction time, and the air tightness of an experiment device is effectively ensured by the two groups of rupture discs.
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus for inducing coal and gas outburst by two-stage linkage of stable differential pressure in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of an experimental method for inducing coal and gas outburst by two-stage linkage of stable differential pressure in example 2 of the present invention;
the device comprises a test box body 1, a loaded test coal body 2, an air guide groove 3, an air guide pipe 4, a high-pressure air source 5, a pressure sensor 6, a control valve 7, a first rupture disk 8, a protruding cavity opening 9 and a second rupture disk 10.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1
This example 1 describes an experimental apparatus for inducing coal and gas outburst by two-stage linkage of stable differential pressure.
As shown in fig. 1, the experimental device includes a protruding experimental box 1, a first rupture disk 8, a second rupture disk 10, a first air pressure adjusting mechanism, a second air pressure adjusting mechanism, and the like.
Wherein, the outstanding experiment box body 1 is a container for loading the experiment coal body 2 and a carrier of a main testing instrument.
The protruding test chamber 1 is preferably made of stainless steel. And according to different designs, a monitoring circuit and an air passage are embedded in the stainless steel plate and used for internal air pressure loading and data transmission of gas parameter (temperature, stress and the like) sensors.
A protruding cavity opening 9 is arranged on one side wall (such as the left side wall in figure 1) of the protruding experiment box body 1. Wherein, the protruding orifice 9 is in a shape of a circular truncated cone, and the diameter of the inner port of the protruding orifice 9 is larger than that of the outer port.
For example, the outer port diameter of the projection port 9 is designed to be 100mm, and the inner port diameter is designed to be 150 mm.
The protrusion experiment box 1 is also provided with a three-way stress loading mechanism (not shown in the figure) for applying three-way stress to the experiment coal body 2 loaded in the protrusion experiment box, and the three-way stress loading mechanism is of a known structure.
In addition, sensor devices, such as a temperature sensor, a stress sensor and a displacement dynamic tester (not shown in the figure), are further arranged in the outstanding experiment box body 1, and data obtained by using the sensor devices is beneficial to developing outstanding experiment research and analysis.
The first rupture disk 8 is a high-pressure rupture disk, the second rupture disk 10 is a low-pressure rupture disk, and the rupture pressure of the first rupture disk 8 is higher than that of the second rupture disk 10 in the process of inducing the protrusion experiment.
Wherein, the first rupture disk has a pressure-bearing range of 0.5-10.0 MPa, and the second rupture disk has a pressure-bearing range of 0.3-6.0 MPa.
As shown in fig. 1, the first rupture disk 8 is installed at the outer port of the protruding cavity 9, and the outer port of the protruding cavity 9 is sealed after the first rupture disk 8 is installed.
The second rupture disk 10 is installed at the inner port of the protruding cavity port 9 and seals the inner port of the protruding cavity port 9.
Due to the existence of the two rupture discs, a closed space is formed in the protruding cavity opening 9, and the air tightness of the device is ensured.
The first air pressure adjusting mechanism is used for protruding the inner side of the experiment box body 1 to supply air and adjusting the air supply pressure, the structure of the first air pressure adjusting mechanism is shown in figure 1, and the first air pressure adjusting mechanism comprises an air duct 4, a high-pressure air source 5 and the like.
One end of the air duct 4 is connected to the high-pressure air source 5, and the other end extends into the inner side of the protruding experiment box body 1.
A pressure sensor 6 and a control valve 7 are mounted on the gas conduit 4.
The pressure sensor 6 is preferably a Honeywell high-precision pressure sensor for measuring the gas pressure in the tank 1.
Specifically, the bottom of the protruding experiment box body 1 is provided with an air guide groove 3.
The other end of the air duct 4 extends into the inner side of the protruding experiment box body 1 and is communicated with the air duct 3.
Similarly, the second air pressure adjusting mechanism is used for supplying air into the protruding cavity opening 9 and adjusting the air supply pressure. Here, the inside of the protruding orifice 9 refers to a protruding orifice-closing region located between the first rupture disk 8 and the second rupture disk 10.
The structure of the second air pressure adjusting mechanism in this embodiment 1 is completely the same as that of the first air pressure adjusting mechanism, that is, the second air pressure adjusting mechanism also includes a gas guide tube 4, a high pressure gas source 5, a pressure sensor 6, a control valve 7, and other components.
The air duct 4 of the second air pressure adjusting structure extends into the protruding cavity opening 9.
In the embodiment, the outburst experiment box body and the loaded experiment coal body with known volumes are utilized, under the three-dimensional stress combination and the high-pressure simulated gas adsorption state, the experiment is completed to induce outburst by means of three different pressure parameters in the atmospheric pressure, the outburst cavity opening 9 and the outburst experiment box body 1 through the two groups of rupture discs and the burst pressure combination, and the power phenomenon is completed.
The experimental apparatus described in example 1 was applied to the premise that the protrusion occurrence condition was satisfied.
Example 2
Example 2 describes an experimental method for inducing coal and gas outburst by two-stage linkage of stable pressure difference, which is implemented based on the experimental device for inducing coal and gas outburst by two-stage linkage of stable pressure difference in example 1.
As shown in FIG. 2, an experimental method for inducing coal and gas outburst by stable differential pressure two-stage linkage comprises the following steps:
I. and the structural arrangement of the loaded experimental coal body and the sensing device is completed in the protruding experimental box body.
Firstly, a loaded experiment coal body 2 with a known volume is packaged in a protruding experiment box body, and then a temperature sensor, a stress sensor and a displacement dynamic tester are respectively arranged in the protruding experiment box body to test a coal seam in a target area.
The loaded experimental coal body 2 has various coal-rock combinations, such as rock + coal, coal + rock + coal, rock + coal + rock, coal rock + fault and the like.
II, after the air tightness of the protrusion experiment box body is checked, the air pressure loading in the protrusion experiment box body is realized by utilizing a first air pressure adjusting mechanism; and meanwhile, a three-way stress loading mechanism is utilized to realize the loading of the three-way stress in the protruding experiment box body.
Setting loading rates of different stresses and gas injection rates, and stabilizing the stress when the loading stress reaches 60% -70% of a preset stress value; and according to the critical pressure of the second rupture disk, completing 50% of the critical pressure value.
When gas is injected into the protrusion experiment box body, gas is injected into the protrusion cavity by the second air pressure adjusting mechanism, and when the gas pressure in the protrusion cavity reaches a set air pressure value in the protrusion cavity during an experiment, the pressure is stabilized.
In the step II, the purpose of injecting gas into the protruding experiment box 1 and the protruding cavity 9 is to ensure that the pressure difference between the two sides of the second rupture disk does not exceed the critical pressure of the second rupture disk, thereby preventing the second rupture from exploding in advance.
And III, continuously completing synchronous loading of the three-dimensional stress according to experimental simulation requirements, and achieving a preset stress state. And performing pre-stress test on stress strain, air pressure and temperature parameters, and keeping stability.
Here, the values of the parameters of strain, pressure and temperature are automatically recorded by the sensors, and therefore are not described in detail.
No. one atmospheric pressure adjustment mechanism continues to inject experimental gas into outstanding experiment box 1, continues to inject gaseous aim at, owing to the adsorption of the experimental coal body 2 of bearing load in outstanding experiment box 1 for atmospheric pressure in the outstanding experiment box 1 descends.
After the loaded experimental coal body 2 is adsorbed and balanced, gas is continuously injected into the protruding experimental box body 1, so that the set gas pressure value and the stable pressure in the protruding experimental box body 1 are highlighted when the gas pressure in the protruding experimental box body 1 reaches the experiment.
And IV, after the stress and air pressure loading balance is completed, continuously injecting air into the protruding cavity opening by the second air pressure adjusting mechanism according to a set speed, and confirming the experimental equipment and the experimental environment again after the pressure reaches 80% of the critical pressure value of the second rupture disk.
Wherein the set rate refers to a set gas loading rate.
Confirming the experimental equipment and the experimental environment specifically means that the equipment is normally operated and gas does not leak.
V. the second atmospheric pressure adjustment mechanism continues to inject gas in good time into protruding accent, until starting first rupture disk 8 and detonating, second rupture disk 10 links detonating immediately, and the dynamic phenomenon takes place, accomplishes and induces the outstanding experiment.
Here, in due time, it means that stable operation of the equipment is ensured, the air pressure in the protruding experiment box body 1 is stable, the air adsorption is basically balanced, and after the pressure drop in unit time is lower than a set value, high-pressure air is injected into the protruding cavity opening at regular time.
VI, completing data reading;
and establishing parameter comparison of pressure-time, stress-time and speed-time, and inverting the prominent development process.
The principle of the experimental method in this embodiment 2 is as follows: by means of the loaded coal rock in the plastic rheological state, the loaded coal rock is suddenly unloaded in the saturated adsorption state, and the elastic-plastic expansion of the coal rock causes the local coal rock structure to be damaged and directionally moved.
To ensure the safety and controllability of unloading, this embodiment 2 proposes a linkage control technique, that is:
under the condition of stable adsorption state, the stable air pressure in the protruding experiment box body 1 is P1, the air pressure in the protruding cavity is P2, wherein P2 is more than or equal to P1; setting the critical pressure difference of the second rupture disk 10 to be delta P1, and maintaining delta P1> P2-P1 during the loading process;
setting the outdoor air pressure to be the atmospheric pressure P0, and setting the critical pressure difference Δ P2 of the first rupture disk 8 to be P2-P0;
wherein, the delta P2 is more than delta P1, and the delta P2 is 3-5 times of the delta P1.
In the process of boosting the air pressure in the protruding cavity opening 9, once the first rupture disk 8 starts to explode, the second rupture disk 10 explodes immediately, the experimental coal rock and the experimental gas in the protruding experimental box body 1 are simultaneously released, and the phenomenon of simulating the protruding power is induced.
The invention adopts a stable two-stage pressure difference technology to realize the gas high-low pressure linkage effect, and the linkage process is as follows:
setting the air pressure in the protruding experiment box body 1 according to experiment needs and keeping the air pressure stable, then adjusting the pressure in the protruding cavity opening, changing the difference value between the pressure in the protruding cavity opening 9 and the atmospheric pressure, and gradually increasing the pressure until the first rupture disk 8 ruptures;
at this time, the air pressure value in the protruding cavity opening 9 is rapidly reduced, so that the pressure difference between the protruding cavity opening 9 and the protruding experiment box body 1 exceeds the critical pressure difference of the second rupture disk 10, which directly causes the rupture of the second rupture disk and induces a dynamic phenomenon.
Compared with the existing outburst inducing mode, the mode of realizing outburst induction by the linkage of the upper gas high-low pressure has the advantages that:
according to the invention, the pressure rise of the protruding cavity opening 9 is adjusted through the high pressure resistance characteristic of the first rupture disk 8, so that the pressure in the protruding cavity opening 9 and the pressure in the loaded experimental coal 2 in the protruding experimental box body keep a certain pressure difference range, the second rupture disk is ensured to be in a stable state, the flexible adjustment of the stress and the experimental pressure by protruding simulation is met, and the success rate of experiments is improved.
Utilize two-stage pressure difference linkage to lure abrupt technique and equipment combination can realize the quantization control of outstanding pressure, specifically reflect:
1. the pressure in the protruding cavity opening 9 is flexibly adjusted according to the air pressure in the experimental coal gas, so that the critical pressure difference delta P1 of the second rupture disk 10 can be adjusted as required, and quantitative control can be realized; 2. as the pressure in the protruding cavity opening 9 is increased, the critical pressure difference delta P2 of the first rupture disk 8 is combined to determine the proper outburst induction time, so that the development of a pneumatic outburst induction device is realized, and external associated equipment is reduced.
Here, reducing the external associated device means reducing the external force action of the external other power device or mechanical device on the protrusion orifice.
It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides an experimental apparatus for coal and gas outburst is induced in linkage of stable pressure difference second grade which characterized in that includes:
a protruding cavity opening is formed in one side wall of the box body;
the first rupture disk is arranged at the outer port of the protruding cavity opening and used for plugging the outer port of the protruding cavity opening;
the second rupture disk is arranged at the inner port of the protruding cavity port and used for plugging the inner port of the protruding cavity port;
the first air pressure adjusting mechanism is configured to supply air into the protruding experiment box body and adjust air pressure of the supplied air; and
a second air pressure adjustment mechanism configured to supply air into the protruding cavity and adjust air pressure of the supplied air;
the protruding cavity opening and the protruding experiment box body are both closed spaces;
the critical pressure difference of the first rupture disk during blasting is larger than that of the second rupture disk during blasting.
2. The experimental device for inducing coal and gas outburst through stable differential pressure two-stage linkage as claimed in claim 1,
the protruding experiment box body is rectangular and made of stainless steel materials.
3. The experimental device for inducing coal and gas outburst through stable differential pressure two-stage linkage as claimed in claim 1,
the protruding cavity opening is in a circular truncated cone shape, and the diameter of the inner port of the protruding cavity opening is larger than that of the outer port.
4. The experimental device for inducing coal and gas outburst through stable differential pressure two-stage linkage as claimed in claim 1,
the first air pressure adjusting mechanism comprises a high-pressure air source and an air guide pipe;
the high-pressure air source is connected with one end of the air duct, and the other end of the air duct extends into the protruding experiment box body;
the air duct is provided with a control valve and a pressure sensor.
5. The experimental device for inducing coal and gas outburst through stable differential pressure two-stage linkage as claimed in claim 4,
the bottom in the protruding experiment box body is provided with an air guide groove;
the air guide pipe extends into the protruding experiment box body and is communicated with the air guide groove.
6. The experimental device for inducing coal and gas outburst through stable differential pressure two-stage linkage as claimed in claim 1,
the second air pressure adjusting mechanism comprises a high-pressure air source and an air guide pipe;
the high-pressure air source is connected with one end of the air duct, and the other end of the air duct extends into the protruding cavity;
the air duct is provided with a control valve and a pressure sensor.
7. The experimental device for inducing coal and gas outburst through stable differential pressure two-stage linkage as claimed in claim 1,
the pressure-bearing range of the first rupture disk is 0.5-10.0 MPa, and the pressure-bearing range of the second rupture disk is 0.3-6.0 MPa.
8. An experimental method for inducing coal and gas outburst by stable pressure difference two-stage linkage is characterized in that,
the experimental device for inducing coal and gas outburst based on stable pressure difference secondary linkage of any one of claims 1 to 7;
the experimental method comprises the following steps:
I. completing structural arrangement of a loaded experimental coal body and a sensing device in the outburst experimental box body;
after the air tightness of the protrusion experiment box body is checked, the air pressure loading in the protrusion experiment box body is realized by utilizing the first air pressure adjusting mechanism, and the three-way stress loading in the protrusion experiment box body is realized by utilizing the three-way stress loading mechanism;
setting loading rates of different stresses and gas injection rates, stabilizing the stress when the loading stress reaches 60% -70% of a preset stress value, and finishing 50% of a critical pressure value of a second rupture disk according to the critical pressure of the second rupture disk;
when gas is injected into the protrusion experiment box body, gas is injected into the protrusion cavity by using the second air pressure adjusting mechanism, and when the gas pressure in the protrusion cavity reaches a set air pressure value in the protrusion cavity during the experiment, the pressure is stabilized;
III, continuously completing synchronous loading of three-dimensional stress according to experimental simulation requirements, and achieving a preset stress state; carrying out stress strain, air pressure and temperature parameter pre-stress test and maintaining stability; then, the first air pressure adjusting mechanism continues to inject experimental gas into the protruding experiment box until the set air pressure value in the protruding experiment box is reached during the experiment, and the pressure is stabilized;
IV, after the stress and air pressure loading balance is completed, continuously injecting air into the protruding cavity opening by the second air pressure adjusting mechanism according to a set speed, and confirming the experimental equipment and the experimental environment again after the pressure reaches 80% of the critical pressure value of the second rupture disk;
v. the second air pressure adjusting mechanism timely and continuously injects gas into the protruding cavity until the first rupture disk is started to explode, the second rupture disk is immediately linked to explode, a power phenomenon occurs, and the protruding induction experiment is completed.
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Cited By (2)
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| CN114965937A (en) * | 2021-06-07 | 2022-08-30 | 山东科技大学 | Coal and gas outburst simulation experiment method considering influence of elastic energy of surrounding rock |
| CN116183864A (en) * | 2022-12-23 | 2023-05-30 | 重庆大学 | Axial end face coal and gas outburst simulation test system under multi-field coupling condition |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995092A (en) * | 2014-06-12 | 2014-08-20 | 中煤科工集团重庆研究院有限公司 | Dynamic effect simulation experiment device for coal and gas outburst |
| CN103995093A (en) * | 2014-06-12 | 2014-08-20 | 中煤科工集团重庆研究院有限公司 | Dynamic system for coal and gas outburst dynamic effect simulation experiment |
| CN104196568A (en) * | 2014-08-27 | 2014-12-10 | 中煤科工集团重庆研究院有限公司 | Gas pressure regulation system and method for coal and gas outburst experiment |
| CN204165873U (en) * | 2014-11-07 | 2015-02-18 | 四川大学 | For testing the system of mining active process off-load coal and rock permeability |
| CN105527177A (en) * | 2016-01-11 | 2016-04-27 | 中国人民解放军理工大学 | Test method for simulating explosion ground shock disturbance of deep rock mass and device thereof |
| CN106483267A (en) * | 2016-10-17 | 2017-03-08 | 中国矿业大学 | A kind of moulded coal true to nature and gas outburst simulation test device and method |
| CN107505207A (en) * | 2017-08-16 | 2017-12-22 | 西南石油大学 | A kind of Multifunctional drill broken rock experimental provision and method that can test rock triaxial strength parameter |
| CN108344675A (en) * | 2018-02-08 | 2018-07-31 | 四川大学 | Coal body adopts the test method of permeation fluid mechanics rule under the conditions of simulation protective coat extracted |
| CN108798630A (en) * | 2018-04-28 | 2018-11-13 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining simulation experiment system |
| CN109490107A (en) * | 2018-11-19 | 2019-03-19 | 四川大学 | The explosively loading experimental rig of high stressed soft rock under a kind of three axis confining pressure |
| CN110284922A (en) * | 2019-07-02 | 2019-09-27 | 中国矿业大学 | A kind of CO2Geological storage strengthens gas drainage and induces prominent method for testing risk |
| 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 |
| CN110823613A (en) * | 2019-11-11 | 2020-02-21 | 山东大学 | Tunnel surrounding rock and lining coupling structure bearing waterproof test system and method |
-
2020
- 2020-05-21 CN CN202010433609.3A patent/CN111551692A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995092A (en) * | 2014-06-12 | 2014-08-20 | 中煤科工集团重庆研究院有限公司 | Dynamic effect simulation experiment device for coal and gas outburst |
| CN103995093A (en) * | 2014-06-12 | 2014-08-20 | 中煤科工集团重庆研究院有限公司 | Dynamic system for coal and gas outburst dynamic effect simulation experiment |
| CN104196568A (en) * | 2014-08-27 | 2014-12-10 | 中煤科工集团重庆研究院有限公司 | Gas pressure regulation system and method for coal and gas outburst experiment |
| CN204165873U (en) * | 2014-11-07 | 2015-02-18 | 四川大学 | For testing the system of mining active process off-load coal and rock permeability |
| CN105527177A (en) * | 2016-01-11 | 2016-04-27 | 中国人民解放军理工大学 | Test method for simulating explosion ground shock disturbance of deep rock mass and device thereof |
| CN106483267A (en) * | 2016-10-17 | 2017-03-08 | 中国矿业大学 | A kind of moulded coal true to nature and gas outburst simulation test device and method |
| CN107505207A (en) * | 2017-08-16 | 2017-12-22 | 西南石油大学 | A kind of Multifunctional drill broken rock experimental provision and method that can test rock triaxial strength parameter |
| CN108344675A (en) * | 2018-02-08 | 2018-07-31 | 四川大学 | Coal body adopts the test method of permeation fluid mechanics rule under the conditions of simulation protective coat extracted |
| CN108798630A (en) * | 2018-04-28 | 2018-11-13 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining simulation experiment system |
| CN109490107A (en) * | 2018-11-19 | 2019-03-19 | 四川大学 | The explosively loading experimental rig of high stressed soft rock under a kind of three axis confining pressure |
| CN110284922A (en) * | 2019-07-02 | 2019-09-27 | 中国矿业大学 | A kind of CO2Geological storage strengthens gas drainage and induces prominent method for testing risk |
| 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 |
| CN110823613A (en) * | 2019-11-11 | 2020-02-21 | 山东大学 | Tunnel surrounding rock and lining coupling structure bearing waterproof test system and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114965937A (en) * | 2021-06-07 | 2022-08-30 | 山东科技大学 | Coal and gas outburst simulation experiment method considering influence of elastic energy of surrounding rock |
| CN114965937B (en) * | 2021-06-07 | 2024-03-15 | 山东科技大学 | Coal and gas outburst simulation experiment method considering influence of elasticity of surrounding rock |
| CN116183864A (en) * | 2022-12-23 | 2023-05-30 | 重庆大学 | Axial end face coal and gas outburst simulation test system under multi-field coupling condition |
| CN116183864B (en) * | 2022-12-23 | 2023-08-22 | 重庆大学 | Axial end face coal and gas outburst simulation test system under multi-field coupling condition |
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