CN217587202U - Multi-field coupling dynamic characteristic experiment system for graded loading and unloading coal bodies - Google Patents
Multi-field coupling dynamic characteristic experiment system for graded loading and unloading coal bodies Download PDFInfo
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- CN217587202U CN217587202U CN202121435007.8U CN202121435007U CN217587202U CN 217587202 U CN217587202 U CN 217587202U CN 202121435007 U CN202121435007 U CN 202121435007U CN 217587202 U CN217587202 U CN 217587202U
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Abstract
The utility model discloses a multi-field coupling dynamic characteristic experiment system for graded loading and unloading coal bodies, which comprises an experiment device and a monitoring device; the experimental device comprises an inflating device, a stress loading and unloading device, a seepage desorption device and a gas extraction device; the inflation device comprises a gas cylinder, a manual valve, a pressure reducing valve and a pneumatic valve; the seepage desorption device comprises a coal sample bin, and the stress loading and unloading device comprises a loading pump, a loading oil cylinder, a piston rod and a loading plate; the gas extraction device comprises a pneumatic valve, a stop valve and an extraction pump; the coal sample bin is of a cavity structure, a gas inlet and a gas outlet are formed in the coal sample bin, the gas cylinder is communicated with the gas inlet of the coal sample bin through a gas pipeline, and a manual valve, a pressure reducing valve and a pneumatic valve are sequentially arranged on the gas pipeline; the gas outlet of the coal sample bin is communicated and connected with an extraction pump in the gas extraction device through a gas transmission pipeline. The method is used for simulating the strain and the damage characteristic in the loading process of the coal body under different stress environments, and the adsorption and desorption seepage conditions of the coal body under different conditions.
Description
Technical Field
The utility model belongs to the technical field of coal bed gas, colliery gas development utilizes, specifically belong to a hierarchical many field coupling dynamic characteristic experimental system of the coal body that adds uninstallation.
Background
Along with the gradual increase of the coal mining depth in China, the gas pressure and the gas content of a coal bed are obviously increased, and in addition, the gas permeability of the coal bed in most areas in China is low, the difficulty of gas extraction of a coal mine is increased more and more, and coal and gas outburst and gas explosion accidents are frequent. In order to improve the gas extraction efficiency and ensure the safe and efficient production operation of a coal mine, the analytic seepage rule of the loaded gas-containing coal body needs to be mastered more accurately.
At present, most of researchers develop experimental devices which cannot comprehensively consider original gas occurrence environments where coal bodies are located and different stress environments where coal bodies are subjected when researching the strain of the coal bodies in different stress environments and the damage characteristics of the coal bodies in a loading process and the adsorption-desorption-seepage conditions of the coal bodies under different conditions, and lack systematic monitoring and research on the stress strain of the coal bodies in a loading and unloading process and the desorption conditions of the gas seepage.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a hierarchical many field coupling dynamic characteristic experimental system of loading and unloading coal body is used for simulating the coal body and meets an emergency and the destruction characteristic of loading in-process under different stress environment to and the coal body absorption-desorption-seepage flow condition of gas under different conditions.
In order to achieve the above object, the utility model provides a following technical scheme:
a multi-field coupling dynamic characteristic experiment system for graded loading and unloading coal bodies comprises an experiment device and a monitoring device;
the experimental device comprises an inflating device, a stress loading and unloading device, a seepage desorption device and a gas extraction device;
the gas charging device comprises a gas cylinder, a manual valve, a second reducing valve and a first pneumatic valve; the seepage desorption device comprises a coal sample bin, and the stress loading and unloading device comprises a loading pump, a loading oil cylinder, a piston rod and a loading plate; the gas extraction device comprises a second pneumatic valve, a second stop valve and an extraction pump;
the coal sample bin is of a cavity structure, a gas inlet and a gas outlet are formed in the coal sample bin, the gas cylinder is communicated with the gas inlet of the coal sample bin through a gas pipeline, and a manual valve, a second pressure reducing valve and a first pneumatic valve are sequentially arranged on the gas pipeline; the gas outlet of the coal sample bin is communicated and connected with an extraction pump in a gas extraction device through a gas transmission pipeline, and a second pneumatic valve and a second stop valve are sequentially arranged on the gas transmission pipeline along the gas flow direction;
the loading oil cylinder is arranged on the outer side wall of the coal sample bin and is in sealed connection with the outer side wall of the coal sample bin, the loading pump is connected with an inner cavity of the loading oil cylinder, a piston rod is arranged in the inner cavity of the loading oil cylinder, a loading plate is arranged at the end part of the piston rod, and the loading plate is in sealed connection with the side wall of the coal sample bin;
the monitoring device comprises a non-contact full-field strain measuring device, an acoustic emission monitoring device and a multi-parameter measurement and control device;
the acoustic emission monitoring device comprises an acoustic emission probe and an acoustic emission amplifier; the multi-parameter measurement and control device comprises a first pressure gauge, a first flow sensor, a data acquisition instrument, a pressure gauge and a monitoring host;
the first flow sensor and the first pressure gauge are arranged on a gas pipeline of the gas cylinder, and the output ends of the first flow sensor and the first pressure gauge are connected with the input end of the data acquisition instrument; the acoustic emission probe is arranged on the side wall of the coal sample bin, the output end of the acoustic emission probe is connected with the input end of an acoustic emission amplifier, the output end of the acoustic emission amplifier is connected with the input end of a data acquisition instrument, and the output end of the data acquisition instrument is connected with a monitoring host;
the non-contact full-field strain measuring device is arranged on the outer side of the gas outlet of the coal sample bin, and the output end of the non-contact full-field strain measuring device is connected with the monitoring host.
Preferably, the inflation device further comprises a first pressure reducing valve, a first stop valve and a buffer tank, the buffer tank is connected with the gas outlet of the gas cylinder through a gas transmission pipeline, and the first pressure reducing valve and the first stop valve are sequentially arranged on the gas transmission pipeline; the other end of the buffer tank is connected with the inner cavity of the coal sample bin.
Preferably, the coal sample bin is machined by adopting a forged piece, a detachable upper end cover is arranged at the upper end of the coal sample bin, and a loading oil cylinder is arranged on the upper end cover.
Preferably, the side walls of the air inlet and the air outlet of the coal sample bin are provided with I-shaped radial grooves.
Preferably, a second pressure gauge and a second flow sensor are arranged on a gas transmission pipeline between the gas outlet of the coal sample bin and the extraction pump, and the second pressure gauge and the second flow sensor are connected with the input end of the data acquisition instrument.
Preferably, the extraction pump is a program-controlled adjustable extraction pump.
Preferably, the inner cavity of the coal sample bin is of a rectangular structure, the four side walls of the rectangular cavity are provided with acoustic emission probes, and the acoustic emission probes are in close contact with the coal sample.
Preferably, the acoustic emission probes in the coal sample bin are arranged in a cross manner.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a multi-field coupling dynamic characteristic experiment system for grading loading and unloading coal bodies, which can simulate different stress environments of the coal bodies; the extraction device can simulate seepage desorption of coal under different extraction negative pressure; the non-contact full-field strain measurement system can measure the strain field of the coal wall of the side opening experiment; the acoustic emission monitoring device can monitor the damage characteristics of the coal body in the loading process in real time; the multi-parameter measurement and control device can monitor and control parameters such as stress strain, extraction negative pressure, acoustic emission signals, gas pressure flow and the like in the experimental process in real time; the inflation device can simulate different gas occurrence states of the coal body; the coal sample gas surface diffusion seepage desorption device can realize the process of converting point diffusion into surface diffusion of gas, ensure the uniform adsorption of coal gas and reduce the actual seepage state of the coal gas.
The utility model discloses a add in grades and uninstall coal body "stress-destroy-seepage" many field coupling dynamic characteristic experimental system, add uninstallation device by the different stress environment that can simulate the coal body and locate, can simulate the coal body and take out the seepage desorption of the seepage under the negative pressure effect at the difference and take out the device and gather coal body stress strain and gas flow, the data acquisition device of gas pressure isoparametric constitutes, can monitor coal sample stress and deformation volume in real time, monitoring gas pressure, monitoring data such as flow. The utility model discloses an exert different stresses to the coal body to adjust the gas condition that the coal sample was located, simulate more really contain the different environment of the place of the gas coal body in underground, it has important meaning to the mechanism and the experimental study of more accurate understanding containing the influence of gas coal body seepage flow.
Further, through setting up the buffer tank, treat that the gas in the buffer tank reaches certain pressure after, in the regulation entering coal sample storehouse of relief pressure valve and pneumatic valve again for output gas pressure is more stable, has enlarged the experimental pressure scope.
Furthermore, the coal sample bin is machined by adopting a forged piece, the processing is convenient, the upper end cover can be disassembled, a loading oil cylinder is conveniently installed above the upper end cover, a loading plate is installed at the lower end of the loading oil cylinder, the coal sample in the coal sample bin can be loaded and unloaded in a grading manner, and different stress effects on the coal sample in a coal bed can be simulated.
Furthermore, the radial grooves are formed in the side walls of the air inlet and the air outlet of the coal sample bin, so that the process of converting point diffusion into surface diffusion of gas is realized, and the environmental conditions of the coal sample are simulated more truly.
Furthermore, the acoustic emission probes are respectively arranged on the four side faces of the coal sample bin, the acoustic emission probes are in close contact with the coal sample, and the four holes are arranged in a cross mode, so that acoustic emission responses generated in the loading and unloading processes of the coal sample can be recorded, and the internal damage condition of the coal sample can be conveniently researched.
Furthermore, by using the program-controlled adjustable extraction pump in the gas extraction process, the extraction negative pressure can be adjusted, the seepage desorption process of gas in a coal body can be better simulated, and the program-controlled adjustable extraction pump can be remotely controlled by using the monitoring host.
Drawings
FIG. 1 is a schematic structural view of a multi-field coupling dynamic characteristic experiment system for staged loading and unloading of coal bodies of the present invention;
FIG. 2 is a schematic view of a radial groove on the end face of a side plate of a coal sample bunker in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of arrangement holes of an acoustic emission sensor of a coal sample bin according to an embodiment of the present invention;
in the drawings: 11-1: a gas cylinder; 11-2: a pressure reducing valve; 11-3: a stop valve; 11-4: a buffer tank; 11-5: a manual valve; 11-6: a pressure reducing valve; 11-7: a pneumatic valve; 12-1: a loading pump; 12-2: loading an oil cylinder; 12-3: a piston rod; 12-4: a loading plate; 13-1: a coal sample bin; 13-2: a radiation-type groove; 14-1: a pneumatic valve; 14-2: a stop valve; 14-3: a program-controlled adjustable extraction pump; 21: a non-contact full field strain measurement device; 22-1: an acoustic emission probe; 22-2: an acoustic emission amplifier; 23-1: a first pressure gauge; 23-2: a first flow sensor; 23-3: a data acquisition instrument; 23-4: a second pressure gauge; 23-5: a second flow sensor; 23-6: and monitoring the host.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The utility model provides a hierarchical loading and unloading coal body 'stress-destruction-seepage' multi-field coupling dynamic characteristic experiment system, the loading and unloading device can simulate different stress environments where the coal body is located; the extraction device can simulate seepage desorption of coal under different extraction negative pressure; the non-contact full-field strain measurement system can measure the strain field of the experimental coal wall with the opening on the side surface; the acoustic emission monitoring device can monitor the damage characteristics of the coal body in the loading process in real time; the multi-parameter measurement and control device can monitor and control parameters such as stress strain, extraction negative pressure, acoustic emission signals, gas pressure flow and the like in the experimental process in real time; the inflation device can simulate different gas occurrence states of the coal body; the coal sample gas surface diffusion seepage desorption device can realize the process of converting point diffusion into surface diffusion of gas, ensure the uniform adsorption of coal gas and reduce the actual seepage state of the coal gas.
Adopt the utility model discloses a hierarchical loading and unloading coal body multi-field coupling dynamic characteristic experimental system can accomplish following basic research experiment: 1. desorption rules of gas of loose and crushed coal bodies with different particle sizes; 2. simulation experiment of pressure relief coal wall/top coal gas emission rule; 3. A gas seepage desorption rule under the original coal extraction condition; 4. highlighting the gas desorption seepage rule in the whole process of coal load instability; 5. the law of influence of coal bed joint structure and physical and mechanical properties on gas seepage desorption; 6. influence rules of stress environment, mining disturbance, extraction effect and the like on coal gas seepage desorption.
The utility model discloses an exert different stresses to the coal body to adjust the gas condition and the seepage desorption condition that the coal sample was located, simulate more really contain the different environment of the coal body of gas in the underground place, have important meaning to the mechanism and the experimental study of more accurate grasp containing the influence of gas coal body seepage.
Examples
As shown in fig. 1, the multi-field coupling dynamic characteristic experiment system for graded loading and unloading of coal body "stress-damage-seepage" in this embodiment includes an experiment system and a monitoring device, where the experiment device includes an inflation device, a stress loading and unloading device, a coal sample gas "surface diffusion" seepage desorption device, and a gas extraction device, and the monitoring device includes a non-contact full-field strain measurement device 21, an acoustic emission monitoring device, and a multi-parameter measurement and control device; wherein:
the gas charging device comprises a gas cylinder 11-1, a first pressure reducing valve 11-2, a first stop valve 11-3, a buffer tank 11-4, a manual valve 11-5, a second pressure reducing valve 11-6 and a first pneumatic valve 11-7; the stress loading and unloading device comprises a loading pump 12-1, a loading oil cylinder 12-2, a piston rod 12-3 and a loading plate 12-4; the coal sample gas surface diffusion seepage desorption device comprises a coal sample bin 13-1 and a radial groove 13-2 processed on the end faces of the side plates for air inlet and air outlet; the gas extraction device comprises a second pneumatic valve 14-1, a second stop valve 14-2 and a program-controlled adjustable extraction pump 14-3.
The acoustic emission monitoring device comprises an acoustic emission probe 22-1 and an acoustic emission amplifier 22-2; the multi-parameter measurement and control device comprises a pressure gauge 23-1, a flow sensor 23-2, a data acquisition instrument 23-3, a pressure gauge 23-4, a flow sensor 23-5 and a monitoring host 23-6;
when the gas storage tank is in use, high-pressure gas in the gas cylinder 11-1 flows through the first pressure reducing valve 11-2 and the first stop valve 11-3 to enter the buffer tank 11-4, and the valve of the gas cylinder 11-1 is closed after the gas in the buffer tank 11-4 reaches a certain pressure.
And opening the manual valve 11-5, and allowing the gas in the buffer tank 11-4 to flow through the second reducing valve 11-6, the flow sensor 23-2 and the first pneumatic valve 11-7 to enter the coal sample bin 13-1, so that the coal in the coal sample bin 13-1 is in a gas occurrence state meeting experimental conditions.
After the loading pump 12-1 is started, the loading oil cylinder 12-2 applies pressure to the coal in the coal sample bin 13-1 through the piston rod 12-3 and the loading plate 12-4, at the moment, the acoustic emission probes 22-1 installed on four side surfaces of the coal sample bin 13-1 record the internal damage condition of the coal sample, and the internal damage condition is uploaded to the data acquisition instrument 23-3 through the acoustic emission amplifier 22-2; meanwhile, gas in the coal sample bin 13-1 is pumped out under the action of the program-controlled adjustable extraction pump 14-3, and the extraction effect of coal bed gas is simulated.
In the whole experiment process, the data acquisition instrument 23-3 acquires and records data on a pressure gauge 23-1, a flow sensor 23-2, a loading pump 12-1, the pressure gauge 23-4 and a flow sensor 23-5 which are arranged between the buffer tank 11-4 and the second pneumatic valve 14-1. After the program-controlled adjustable extraction pump 14-3 pumps gas in the coal sample bin 13-1 and the connecting pipeline, the side panel of the gas outlet of the coal sample bin 13-1 is opened, and the non-contact full-field strain measurement system 21 measures the strain of the coal body in the coal sample bin 13-1. The monitoring host 23-6 analyzes and processes the data of the data acquisition instrument 23-3 and the non-contact full-field strain measurement device 21.
High-pressure gas in the gas cylinder 11-1 passes through the first reducing valve 11-2 and the first stop valve 11-3 and then enters the buffer tank 11-4. After the gas in the buffer tank 11-4 reaches a certain pressure, the gas enters the coal sample bin 13-1 through the adjustment of the second pressure reducing valve 11-6 and the first pneumatic valve 11-7, and the gas pressure regulating device is adopted, so that the pressure of the output gas is more stable, and the experimental pressure range is expanded.
The coal sample bin 13-1 is machined by adopting a forged piece, the upper end cover is detachable, the loading oil cylinder 12-2 is arranged above the upper end cover, the loading plate 12-4 is arranged at the lower end of the loading oil cylinder 12-2, and the coal sample in the coal sample bin 13-1 can be loaded and unloaded in a grading manner to simulate different stress effects on the coal sample in a coal bed.
The radial grooves 13-2 are formed in the end faces of the side plates for air inlet and air outlet of the coal sample bin 13-1, so that the process of converting point diffusion into surface diffusion of gas is realized, and the environmental conditions of the coal sample are simulated more truly.
One side of the gas outlet of the coal sample bin 13-1 is a detachable opening which is used for measuring the surface strain of the loaded coal wall by the non-contact full-field strain measuring device 21.
An acoustic emission probe 22-1 is respectively arranged on four side surfaces of the coal sample bin 13-1, the acoustic emission probe 22-1 is tightly contacted with the coal sample, and four holes are arranged in a crossed manner. The acoustic emission response generated in the loading and unloading process of the coal sample can be recorded, and the internal damage condition of the coal sample can be conveniently researched.
The gas in the coal sample bin 13-1 is extracted by using the program-controlled adjustable extraction pump 14-3, the extraction negative pressure can be adjusted, the seepage desorption process of the gas in the coal body can be better simulated, and the program-controlled adjustable extraction pump 14-3 can be remotely controlled by using the monitoring host 23-6.
The use process of the multi-field coupling dynamic characteristic experiment device for graded loading and unloading of coal bodies comprises the following steps:
assembling an experimental system to ensure that the joints of the devices are in a sealed state and are not air-tight, and the manual valve 11-5 is in a closed state;
selecting coal bodies meeting experimental conditions to be prefabricated into the molded coal suitable for being placed in the coal sample bin 13-1, opening a side panel of an air outlet of the coal sample bin 13-1, placing the prefabricated coal sample into the coal sample bin 13-1, installing the side panel to the side surface of the coal sample bin 13-1, and sealing. Starting the loading pump 12-1 to enable the loading plate 12-4 to be tightly attached to the upper surface of the coal sample, and then closing the loading pump 12-1;
the valve of the gas cylinder 11-1 is opened, and the high-pressure gas flows through the first pressure reducing valve 11-2 and the first stop valve 11-3 and enters the buffer tank 11-4. After gas with certain pressure is filled into the buffer tank 11-4, closing a valve of a gas cylinder 11-1, opening a manual valve 11-5, filling gas into a coal sample bin 13-1 to enable the coal sample to be in a gas occurrence state meeting experimental conditions, and after the gas filling is finished, closing the manual valve 11-5;
and starting the loading pump 12-1 again, applying a certain pressure to the coal sample, and pumping out the gas in the coal sample bin 13-1 under the action of the program-controlled adjustable extraction pump 14-3 to simulate the extraction effect of the coal bed gas. In the process, the acoustic emission probe 22-1 records the internal damage condition of the coal sample under the action of pressure and uploads the internal damage condition to the data acquisition instrument 23-3 through the acoustic emission amplifier 22-2. And after the stress loading is finished, the loading pump 12-1 is closed.
And the program-controlled adjustable extraction pump 14-3 continues to suck gas in the coal sample bin 13-1 and the connecting pipeline, after the gas suction is finished, the side panel of the gas outlet of the coal sample bin 13-1 is opened, and the non-contact full-field strain measuring device 21 measures the strain of the coal body in the coal sample bin 13-1.
In the whole experiment process, the data acquisition instrument 23-3 monitors and records data of a pressure gauge 23-1, a flow sensor 23-2, a loading pump 12-1, a pressure gauge 23-4 and a flow sensor 23-5 which are arranged between the coal sample bin 13-1 and the second pneumatic valve 14-1 and uploads the data to the monitoring host 23-6.
After the experiment is finished, starting the loading pump 12-1, restoring the loading plate 12-4 to the original position, opening the coal sample bin 13-1, taking out the coal sample, and cleaning residual coal in the coal sample bin 13-1; and opening the manual valve 11-5 to discharge the gas in the buffer tank 11-4.
As shown in FIG. 2, FIG. 2 is a schematic view of a radial groove 13-2 on the end face of a side plate of a coal sample bin 13-1, the size of the side plate of the coal sample bin 13-1 is 200mm multiplied by 200mm, the pressure resistance is 20Mp, and the side plate is machined from a stainless steel forging. Radial type grooves 13-2 are processed on the side panels of the left air inlet and the right air outlet of the coal sample bin 13-1, the groove lines are concentric circles, the distance is 15mm, and the groove depth is 0.5mm. When gas enters the coal sample bin 13-1 from the left side panel and flows out of the coal sample bin 13-1 from the right side panel, the gas is firstly diffused in a groove line, the process that the gas is converted from point diffusion to surface diffusion is realized, the environmental conditions of the coal sample are more truly simulated, grooves are carved on a plane plate in a concentric circle mode on the side panel of the coal sample bin 13-1, two obliquely symmetrical grooves are used for communicating the grooves of the concentric circle, and the grooves of all the grooves are the same in depth and are on the same plane.
As shown in fig. 3, fig. 3 is a schematic diagram of arrangement holes of acoustic emission sensors in a coal sample bin 13-1, in order to accurately monitor the damage of a coal sample at different positions in each direction in the coal sample loading process, the arrangement holes of the acoustic emission sensors are respectively arranged on four side surfaces of the coal sample bin 13-1, and the arrangement holes of each side surface are arranged in a cross manner, so that the sensors are in close contact with the coal sample. The acoustic emission response generated in the loading and unloading process of the coal sample can be recorded, and the internal damage condition of the coal sample can be conveniently researched.
Claims (8)
1. A multi-field coupling dynamic characteristic experiment system for graded loading and unloading coal bodies is characterized by comprising an experiment device and a monitoring device;
the experimental device comprises an inflating device, a stress loading and unloading device, a seepage desorption device and a gas extraction device;
the gas charging device comprises a gas cylinder (11-1), a manual valve (11-5), a second reducing valve (11-6) and a first pneumatic valve (11-7); the seepage desorption device comprises a coal sample bin (13-1), and the stress loading and unloading device comprises a loading pump (12-1), a loading oil cylinder (12-2), a piston rod (12-3) and a loading plate (12-4); the gas extraction device (14) comprises a second pneumatic valve (14-1), a second stop valve (14-2) and an extraction pump (14-3);
the coal sample bin (13-1) is of a cavity structure, a gas inlet and a gas outlet are arranged on the coal sample bin (13-1), the gas cylinder (11-1) is communicated with the gas inlet of the coal sample bin (13-1) through a gas pipeline, and a manual valve (11-5), a second reducing valve (11-6) and a first pneumatic valve (11-7) are sequentially arranged on the gas pipeline; the gas outlet of the coal sample bin (13-1) is communicated and connected with a gas extraction pump (14-3) in a gas extraction device through a gas transmission pipeline, and a second pneumatic valve (14-1) and a second stop valve (14-2) are sequentially arranged on the gas transmission pipeline along the gas flow direction;
the loading oil cylinder (12-2) is arranged on the outer side wall of the coal sample bin (13-1) and is in sealing connection with the outer side wall of the coal sample bin, the loading pump (12-1) is connected with the inner cavity of the loading oil cylinder (12-2), a piston rod (12-3) is arranged in the inner cavity of the loading oil cylinder (12-2), a loading plate (12-4) is arranged at the end part of the piston rod (12-3), and the loading plate (12-4) is in sealing connection with the side wall of the coal sample bin (13-1);
the monitoring device comprises a non-contact full-field strain measuring device (21), an acoustic emission monitoring device and a multi-parameter measurement and control device;
the acoustic emission monitoring device (22) comprises an acoustic emission probe (22-1) and an acoustic emission amplifier (22-2); the multi-parameter measurement and control device (23) comprises a first pressure gauge (23-1), a first flow sensor (23-2), a data acquisition instrument (23-3), a pressure gauge (23-4) and a monitoring host (23-6);
the first flow sensor (23-2) and the first pressure gauge (23-1) are arranged on a gas pipeline of the gas cylinder (11-1), and the output ends of the first flow sensor (23-2) and the first pressure gauge (23-1) are connected with the input end of the data acquisition instrument (23-3); the acoustic emission probe (22-1) is arranged on the side wall of the coal sample bin (13-1), the output end of the acoustic emission probe (22-1) is connected with the input end of an acoustic emission amplifier (22-2), the output end of the acoustic emission amplifier (22-2) is connected with the input end of a data acquisition instrument (23-3), and the output end of the data acquisition instrument (23-3) is connected with a monitoring host computer (23-6);
the non-contact full-field strain measuring device (21) is arranged on the outer side of the air outlet of the coal sample bin (13-1), and the output end of the non-contact full-field strain measuring device (21) is connected with the monitoring host (23-6).
2. The multi-field coupling dynamic characteristic experiment system for the graded loading and unloading coal bodies according to claim 1, wherein the aerating device (11) further comprises a first pressure reducing valve (11-2), a first stop valve (11-3) and a buffer tank (11-4), the buffer tank (11-4) is connected with an air outlet of the gas cylinder (11-1) through an air transmission pipeline, and the first pressure reducing valve (11-2) and the first stop valve (11-3) are sequentially arranged on the air transmission pipeline; the other end of the buffer tank (11-4) is connected with the inner cavity of the coal sample bin (13-1).
3. The system for the multi-field coupling dynamic characteristic experiment of the graded loading and unloading coal body according to claim 1, wherein the coal sample bin (13-1) is machined by adopting a forged piece, a detachable upper end cover is arranged at the upper end of the coal sample bin (13-1), and a loading oil cylinder (12-2) is arranged on the upper end cover.
4. The multi-field coupling dynamic characteristic experiment system for the graded loading and unloading coal bodies according to claim 1, wherein a worker radiation type groove (13-2) is formed in the side wall of an air inlet and an air outlet of the coal sample bin (13-1).
5. The system for the multi-field coupling dynamic characteristic experiment of the graded loading and unloading coal body according to claim 1, wherein a second pressure gauge (23-4) and a second flow sensor (23-5) are arranged on a gas transmission pipeline between a gas outlet of the coal sample bin (13-1) and an extraction pump (14-3), and the second pressure gauge (23-4) and the second flow sensor (23-5) are connected with an input end of a data acquisition instrument (23-3).
6. The multi-field coupling dynamic characteristic experiment system for the graded loading and unloading coal body according to claim 1, wherein the extraction pump (14-3) is a program-controlled adjustable extraction pump.
7. The system for the multi-field coupling dynamic characteristic experiment of the graded loading and unloading coal body according to claim 1, wherein an internal cavity of the coal sample bin (13-1) is of a rectangular structure, the four side walls of the rectangular cavity are provided with acoustic emission probes (22-1), and the acoustic emission probes (22-1) are in close contact with the coal sample.
8. The system for the multi-field coupling dynamic characteristic experiment of the graded loading and unloading coal body according to claim 1, wherein the acoustic emission probes (22-1) in the coal sample bin (13-1) are arranged in a cross manner.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281486A (en) * | 2021-06-25 | 2021-08-20 | 中煤能源研究院有限责任公司 | Multi-field coupling dynamic characteristic experiment system and method for graded loading and unloading coal bodies |
| CN115931629A (en) * | 2023-01-09 | 2023-04-07 | 河南理工大学 | Coal seam gas radial flow simulation device and method under negative pressure extraction condition |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281486A (en) * | 2021-06-25 | 2021-08-20 | 中煤能源研究院有限责任公司 | Multi-field coupling dynamic characteristic experiment system and method for graded loading and unloading coal bodies |
| CN115931629A (en) * | 2023-01-09 | 2023-04-07 | 河南理工大学 | Coal seam gas radial flow simulation device and method under negative pressure extraction condition |
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