CN111272544A - Test method for inducing composite dynamic disaster based on coal mine deep mining - Google Patents
Test method for inducing composite dynamic disaster based on coal mine deep mining Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 50
- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000005065 mining Methods 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 230000001939 inductive effect Effects 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 73
- 239000011435 rock Substances 0.000 claims abstract description 46
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- 230000000274 adsorptive effect Effects 0.000 claims description 6
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- 239000011521 glass Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000003331 infrared imaging Methods 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
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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
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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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
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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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
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
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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
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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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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Abstract
The invention discloses a test method for inducing a composite dynamic disaster based on coal mine deep mining, which comprises the following steps: preparing a coal-rock composite test piece; assembling and applying pretightening force; vacuumizing; aerating and fully adsorbing; continuously loading the press; the high-speed pneumatic valve is opened to complete pressure relief when the test piece is damaged; recording the pressure change and the stress-strain of the coal-rock combination and the dynamic display characteristics thereof in real time in the loading process; collecting data to complete one test; the height ratio of the coal-rock combination, the gas pressure and the like are changed to finish other tests in the same group; and (5) sorting and analyzing data and summarizing catastrophe rules. The invention is used for carrying out experimental research on the composite dynamic disaster in the deep coal mining, and has important scientific significance and practical value for further analyzing the occurrence mechanism of the composite dynamic disaster, adopting the targeted composite dynamic disaster prediction, early warning and treatment technology and solving the safety problem in the deep coal mining.
Description
Technical Field
The invention relates to a coal mine dynamic disaster testing method, in particular to a testing method for inducing a composite dynamic disaster based on coal mine deep mining.
Background
China is the largest coal producing country and consuming country in the world, and coal plays an important role in the energy structure of China. However, as a non-renewable energy source, the coal resource is unevenly distributed and demanded in regions in China, so that the form of the coal resource in China is very severe, in order to meet the high-intensity demand for the coal resource, part of mines have to be shifted to deep mining, and the mining depth is increased year by year, and the trend is more and more obvious in recent years. However, the deep mining is faced with the problems of high ground stress, high temperature, high gas and the like, so that the risk of coal and gas outburst is increased, the coal rock impact is enhanced, and the probability of composite coal rock dynamic disasters of some high gas mines and coal and gas outburst mines is further obviously increased, such disasters not only show partial characteristics of coal and gas outburst, but also have partial characteristics of rock burst, and the two dynamic disasters coexist, influence and compound with each other.
Meanwhile, the deep composite coal and rock dynamic disaster is a complex mechanical process under the double actions of high stress (ground stress) and dynamic disturbance (mining pressure relief), and various factors are mutually interwoven in the disaster occurrence process, so that mutual inducement, mutual reinforcement or resonance effect is possibly generated in the accident inoculation, generation and development processes, and further the occurrence mechanism of the composite dynamic disaster is more complex and the theoretical research is more difficult. Based on the above, in order to further clarify the occurrence mechanism and energy conversion mechanism of the composite dynamic disaster, it becomes possible to develop related experimental research, and considering that the composite dynamic disaster on site has great destructiveness and harmfulness, it is not feasible to artificially induce impact-outburst composite dynamic disaster on the coal mine site. Therefore, research and development of a test device capable of meeting corresponding pregnant disaster and disaster causing conditions and development of a series of indoor tests based on the test device are an effective means and a reasonable method.
Disclosure of Invention
In order to achieve the purpose, the invention provides a test method for inducing a composite dynamic disaster based on coal mine deep mining, which adopts the following technical scheme:
a test method for inducing a composite dynamic disaster based on coal mine deep mining is characterized by comprising the following steps:
firstly, preparing a test piece, namely preparing a test piece,
preparing a coal-rock composite test piece based on the thickness ratio of the top plate, the bottom plate and the coal bed, and respectively pasting strain gauges on the surfaces of coal and rock;
secondly, mounting a test piece and mounting and debugging each monitoring device,
the prepared coal-rock combination is put into a high-pressure-resistant sealed cavity which is connected with a transparent pipeline;
the third step, the test process,
starting the power loading module, applying axial pre-tightening force to the coal-rock composite body test piece in the high-pressure-resistant sealing cavity, and keeping the test piece stable; vacuumizing the high-pressure-resistant sealed cavity through a vacuumizing end; injecting adsorptive gas into the high-pressure-resistant sealed cavity and keeping the preset adsorption time;
when the specified adsorption time is reached, loading is carried out through a power loading module according to a displacement loading mode, and acoustic emission signals and air pressure change in the high-pressure resistant sealed cavity are synchronously monitored;
gradually loading until a test piece is damaged, opening the explosion-proof high-speed pneumatic valve at the moment of the damage of the test piece, instantly releasing pressure of a high-pressure-resistant sealed cavity, synchronously recording gas pressure, gas concentration and temperature at different positions of the transparent pipeline, and recording infrared imaging and motion characteristics of the crushed and thrown lump coal body through the thermal infrared imager and the split high-speed camera; counting the total amount, the geometric characteristics and the distribution characteristics along the pipeline of the crushed and thrown lump coal;
step four, finishing the test for one time,
collecting and sorting the monitored data, and finishing a test;
step five, performing other tests in the same group,
respectively changing the thickness ratio of coal to rock and/or gas pressure in the coal-rock combination, and repeating the test;
sixthly, analyzing the test result,
the monitored data is analyzed and summarized systematically.
The axial pre-tightening force applied to the coal-rock composite body test piece in the high-pressure-resistant sealed cavity is 0.3-0.5 kN; the pressure of the adsorptive gas injected into the high-pressure-resistant sealed cavity is 0.1-2 MPa, and the adsorption time is not less than 24 h.
The power loading module provides power for the coal-rock composite body test piece in the high-pressure-resistant sealed cavity through the T-shaped rigid pressure head; the high-pressure-resistant sealed cavity comprises a high-pressure-resistant sealed cavity body and a pressure-bearing base at the bottom, wherein the high-pressure-resistant sealed cavity body and the pressure-bearing base are fixed together;
the outer surface of the high-pressure-resistant sealed cavity body is provided with a groove for fixing the acoustic emission probe;
the high-pressure-resistant sealed cavity body is provided with a lead output end, an input end and an output end;
the output end of the lead is connected with the outside through a glass sintering connector;
the input end I is divided into three and is independently controlled and respectively comprises a vacuum pumping end, an inflation end and a sensor connecting end;
the output end is connected with a transparent pipeline through an explosion-proof high-speed pneumatic valve, and a gas pressure sensor interface, a temperature sensor interface and a gas concentration sensor interface are arranged on the upper plane of the transparent pipeline;
and an infrared thermal imager and a plurality of split high-speed cameras are erected beside the transparent pipeline.
Monitoring the pressure of the high-pressure-resistant sealed cavity through a gas pressure sensor connected with the sensor connecting end; monitoring the gas pressure in the transparent pipeline through a gas pressure sensor connected with a gas pressure sensor interface;
acquiring total stress-strain of the coal rock test piece through a power loading module, and acquiring respective strain of coal and rock in the coal rock test piece through a lead output end;
the geometric characteristics comprise particle size and specific surface area, and the distribution characteristics along the pipeline comprise throwing distance and throwing speed.
The dynamic loading comprises a rigidity testing machine and a pressure bearing cushion block;
the pressure-bearing cushion blocks comprise a first pressure-bearing cushion block and at least one second pressure-bearing cushion block which are overlapped together, limiting grooves are formed in the top and the bottom of the first pressure-bearing cushion block, the limiting grooves in the top are matched with the pressure-bearing base in the bottom, and the limiting grooves in the bottom are matched with the limiting protrusions in the top of the second pressure-bearing cushion block;
and the bottom of the second pressure-bearing cushion block is also provided with a limiting groove.
The lower part of the T-shaped rigid pressure head is provided with a sealing groove and is sleeved with a sealing ring for sealing.
The transparent pipeline is supported by an adjustable support frame.
The central line of the input end and the output end passes through the center of the section of the high-pressure-resistant sealed cavity body where the connecting line is located.
The central line of the groove is in the same horizontal plane with the central lines of the input end and the output end and is vertical to the central lines of the input end and the output end.
The gas pressure sensor interface, the temperature sensor interface and the gas concentration sensor interface are distributed on the same section of the transparent pipeline in a group, and a plurality of groups are distributed at equal intervals along the transparent pipeline.
The invention has the beneficial effects that:
1. the invention provides a method for researching the composite dynamic disaster in the deep coal mine mining based on the test according to the actual situation on site, which is beneficial to supplement the composite dynamic disaster in the aspect of the test, and provides data support for further clarifying the pregnancy disaster-causing mechanism of the composite dynamic disaster in the aspect of theory.
2. The invention can carry out system monitoring on the dynamic effect and disaster-causing effect of the composite disaster, can compare the energy change before and after the disaster through the monitoring parameter system and carry out quantitative characterization, further analyzes the contribution of the elastic energy of the top plate to the disaster, can provide data support for predicting the projection strength under the participation of the top plate, and has important theoretical significance and engineering practical value for the prevention and treatment of the composite dynamic disaster of mines such as rock burst-coal and gas projection and the like induced by deep mining.
3. The device has the advantages of simple and compact structure, low cost and strong operability, and can be used for testing the combination of raw coal-raw rock, molded coal-similar materials and the like, thereby having wide application range.
4. The invention provides a systematic monitoring method and a device aiming at the dynamic characteristics and the post-disaster effect of the catastrophe process, can provide sufficient data support for further analyzing the disaster-causing degree of the composite dynamic disaster, has wide and positive significance and has wider practicability.
Drawings
FIG. 1 is a flow chart of a test method for inducing a composite dynamic disaster based on deep mining of a coal mine.
FIG. 2 is a schematic view of the overall structure of the testing apparatus of the present invention.
Fig. 3 is a first pressure-bearing cushion block of the power loading module-rigidity testing machine of the invention.
Fig. 4 is a second pressure-bearing cushion block of the power loading module-rigidity testing machine of the invention.
Fig. 5 is a top view of the transparent conduit of the present invention.
FIG. 6 shows a coal-rock composite in an embodiment of the invention.
1-a second pressure-bearing cushion block, 2-a first pressure-bearing cushion block, 3-a limiting groove, 3-1-a pressure-bearing base, 4-a high-pressure-resistant sealing cavity body, a 5-T type rigid pressure head, 6-a sealing groove, 7-a sealing ring, 8-a lead wire output end, 9-an input end, 10-an output end and 11-a glass sintering connector, 12-a vacuum pumping end, 13-an inflation end, 14-a sensor connecting end, 15-an explosion-proof high-speed pneumatic valve, 16-a transparent pipeline, 17-an adjustable support frame support, 18-a gas pressure sensor interface, 19-a temperature sensor interface, 20-a gas concentration sensor interface, 21-an infrared thermal imager, 22-a split high-speed camera and 23-a coal-rock combined body test piece.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 to 6, a test method for inducing a composite dynamic disaster based on deep mining of a coal mine specifically includes:
firstly, preparing a test piece, namely preparing a test piece,
preparing a coal-rock combination test piece 23 based on the thickness ratio of the top plate, the bottom plate and the coal bed, and respectively pasting strain gauges on the surfaces of coal and rock; r in FIGS. 2 and 61Being fine sandstone, R2Is a coarse sandstone, C1Is raw coal, F1Is siltstone;
secondly, mounting a test piece and mounting and debugging each monitoring device,
the prepared coal-rock composite body test piece 23 is arranged in a high-pressure-resistant sealed cavity, and the high-pressure-resistant sealed cavity is connected with a transparent pipeline 16;
the third step, the test process,
starting a power loading module, applying axial pre-tightening force to the coal-rock composite body test piece 23 in the high-pressure-resistant sealed cavity, and keeping the test piece stable; vacuumizing the high-pressure-resistant sealed cavity through a vacuumizing end 12; injecting adsorptive gas into the high-pressure-resistant sealed cavity through the inflating end 13 and keeping the preset adsorption time;
when the specified adsorption time is reached, loading is carried out through a power loading module according to a displacement loading mode, and an acoustic emission signal and the air pressure change in the high-pressure resistant sealed cavity are synchronously monitored;
gradually loading until the coal-rock composite test piece 23 is damaged, opening the explosion-proof high-speed pneumatic valve 15 at the moment of the damage of the coal-rock composite test piece 23, instantly releasing the pressure of the high-pressure-resistant sealed cavity, synchronously recording the gas pressure, the gas concentration and the temperature at different positions of the transparent pipeline 16, and recording the infrared imaging and the motion characteristics of the crushed and thrown massive coal in the transparent pipeline 16 through the thermal infrared imager 21 and the split high-speed camera 22; counting the total amount, the geometric characteristics and the distribution characteristics along the pipeline of the crushed and thrown lump coal;
step four, finishing the test for one time,
collecting and sorting the monitored data, and finishing a test;
step five, performing other tests in the same group,
respectively changing the coal-rock thickness ratio and/or the gas pressure in the coal-rock combination, and repeating the test;
sixthly, analyzing the test result,
the monitored data is analyzed and summarized systematically.
The axial pre-tightening force applied to the coal-rock composite body test piece 23 in the high-pressure-resistant sealed cavity is 0.3-0.5 kN; the pressure of the adsorptive gas injected into the high-pressure-resistant sealed cavity is 0.1-2 MPa, and the adsorption time is not less than 24 h;
the power loading module provides power for the coal-rock composite body test piece 23 in the high-pressure-resistant sealed cavity through the T-shaped rigid pressure head; the high-pressure-resistant sealed cavity comprises a high-pressure-resistant sealed cavity body 4 and a pressure-bearing base 3-1 at the bottom, which are fixed together;
a groove (not shown) for fixing the acoustic emission probe is formed in the outer surface of the high-pressure-resistant sealing cavity;
the high-pressure resistant sealed cavity is provided with a lead output end 8, an input end 9 and an output end 10;
the lead output end 8 is connected with the outside through a glass sintering connector 11;
the input end 9I is divided into three parts which are independently controlled and respectively provided with a vacuum pumping end 12, an inflation end 13 and a sensor connecting end 14;
the output end 10 is connected with a transparent pipeline 16 through an explosion-proof high-speed pneumatic valve 15, and the upper plane of the transparent pipeline 16 is provided with a gas pressure sensor interface 18, a temperature sensor interface 19 and a gas concentration sensor interface 20;
an infrared thermal imager 21 and a plurality of split high-speed cameras 22 are erected beside the transparent pipeline 16;
the pressure of the high-pressure-resistant sealed cavity is monitored through a gas pressure sensor connected with the sensor connecting end 14; a gas pressure sensor connected through a gas pressure sensor interface 18 monitors the gas pressure in the transparent pipe 16;
the total stress-strain of the coal rock test piece is obtained through a power loading module, and the strain of coal and rock in the coal rock test piece is obtained through a lead output end 8;
the geometric characteristics comprise particle size and specific surface area, and the distribution characteristics along the pipeline comprise throwing distance and throwing speed;
the dynamic loading comprises a rigidity testing machine (not shown) and a pressure bearing cushion block;
the pressure-bearing cushion block comprises a first pressure-bearing cushion block 2 and at least one second pressure-bearing cushion block 1 which are overlapped together, limiting grooves are formed in the top and the bottom of the first pressure-bearing cushion block 2, the limiting groove 3 in the top is matched with the pressure-bearing base 3-1, and the limiting groove in the bottom is matched with the limiting protrusion in the top of the second pressure-bearing cushion block 1;
the bottom of the second pressure bearing cushion block 1 is also provided with a limiting groove;
the top of the high-pressure resistant sealing cavity is powered by a T-shaped rigid pressure head 5, and the bottom of the T-shaped rigid pressure head 5 is provided with a sealing groove 6 and is sleeved with a sealing ring 7 for sealing;
the transparent pipeline 16 is supported by an adjustable support frame 17;
the central line connecting line of the input end 9 and the output end 10 passes through the center of the section of the high-pressure-resistant sealed cavity body 4 where the connecting line is positioned;
the central line of the groove (not shown) is in the same horizontal plane with the central lines of the input end 9 and the output end 10 and is perpendicular to the central lines of the input end 9 and the output end 10;
the gas pressure sensor interface 18, the temperature sensor interface 19 and the gas concentration sensor interface 20 are distributed on the same section of the transparent pipeline 16 and distributed along the transparent pipeline 16 at equal intervals.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A test method for inducing a composite dynamic disaster based on coal mine deep mining is characterized by comprising the following steps:
firstly, preparing a test piece, namely preparing a test piece,
preparing a coal-rock composite test piece based on the thickness ratio of the top plate, the bottom plate and the coal bed, and respectively pasting strain gauges on the surfaces of coal and rock;
secondly, mounting a test piece and mounting and debugging each monitoring device,
the prepared coal-rock combination is put into a high-pressure-resistant sealed cavity which is connected with a transparent pipeline;
the third step, the test process,
starting the power loading module, applying axial pre-tightening force to the coal-rock composite body test piece in the high-pressure-resistant sealing cavity, and keeping the test piece stable; vacuumizing the high-pressure-resistant sealed cavity through a vacuumizing end; injecting adsorptive gas into the high-pressure-resistant sealed cavity and keeping the preset adsorption time;
when the specified adsorption time is reached, loading is carried out through a power loading module according to a displacement loading mode, and acoustic emission signals and air pressure change in the high-pressure resistant sealed cavity are synchronously monitored;
gradually loading until a test piece is damaged, opening the explosion-proof high-speed pneumatic valve at the moment of the damage of the test piece, instantly releasing pressure of a high-pressure-resistant sealed cavity, synchronously recording gas pressure, gas concentration and temperature at different positions of the transparent pipeline, and recording infrared imaging and motion characteristics of the crushed and thrown lump coal body through the thermal infrared imager and the split high-speed camera; counting the total amount, the geometric characteristics and the distribution characteristics along the pipeline of the crushed and thrown lump coal;
step four, finishing the test for one time,
collecting and sorting the monitored data, and finishing a test;
step five, performing other tests in the same group,
respectively changing the thickness ratio of coal to rock and/or gas pressure in the coal-rock combination, and repeating the test;
sixthly, analyzing the test result,
the monitored data is analyzed and summarized systematically.
2. The test method as claimed in claim 1, wherein the axial pre-tightening force applied to the coal-rock composite body test piece in the high-pressure-resistant sealed cavity is 0.3-0.5 kN; the pressure of the adsorptive gas injected into the high-pressure-resistant sealed cavity is 0.1-2 MPa, and the adsorption time is not less than 24 h.
3. The test method as claimed in claim 1, wherein the power loading module provides power to the coal-rock composite body test piece in the high-pressure resistant sealed cavity through a T-shaped rigid pressure head; the high-pressure-resistant sealed cavity comprises a high-pressure-resistant sealed cavity body and a pressure-bearing base at the bottom, wherein the high-pressure-resistant sealed cavity body and the pressure-bearing base are fixed together;
the outer surface of the high-pressure-resistant sealed cavity body is provided with a groove for fixing the acoustic emission probe;
the high-pressure-resistant sealed cavity body is provided with a lead output end, an input end and an output end;
the output end of the lead is connected with the outside through a glass sintering connector;
the input end I is divided into three and is independently controlled and respectively comprises a vacuum pumping end, an inflation end and a sensor connecting end;
the output end is connected with a transparent pipeline through an explosion-proof high-speed pneumatic valve, and a gas pressure sensor interface, a temperature sensor interface and a gas concentration sensor interface are arranged on the upper plane of the transparent pipeline;
and an infrared thermal imager and a plurality of split high-speed cameras are erected beside the transparent pipeline.
4. A test method as claimed in claim 3, wherein the pressure of the high pressure resistant sealed chamber is monitored by a gas pressure sensor connected to the sensor connection end; monitoring the gas pressure in the transparent pipeline through a gas pressure sensor connected with a gas pressure sensor interface;
acquiring total stress-strain of the coal rock test piece through a power loading module, and acquiring respective strain of coal and rock in the coal rock test piece through a lead output end;
the geometric characteristics comprise particle size and specific surface area, and the distribution characteristics along the pipeline comprise throwing distance and throwing speed.
5. The test method of any one of claims 1 to 4, wherein the dynamic loading comprises a stiffness tester and a pressure pad;
the pressure-bearing cushion blocks comprise a first pressure-bearing cushion block and at least one second pressure-bearing cushion block which are overlapped together, limiting grooves are formed in the top and the bottom of the first pressure-bearing cushion block, the limiting grooves in the top are matched with the pressure-bearing base in the bottom, and the limiting grooves in the bottom are matched with the limiting protrusions in the top of the second pressure-bearing cushion block;
and the bottom of the second pressure-bearing cushion block is also provided with a limiting groove.
6. The test method as claimed in claim 3 or 4, wherein the lower part of the T-shaped rigid pressure head is provided with a sealing groove and is sleeved with a sealing ring for sealing.
7. The test method of claim 1, wherein the transparent tube is supported by an adjustable support frame.
8. A test method according to claim 3, wherein a line connecting the centre lines of the input and output ends passes through the centre of the cross-section of the body of the pressure-resistant sealed chamber in which the line is located.
9. A test method according to claim 3, wherein the groove centre line is in the same horizontal plane as the input and output end centre lines and perpendicular to the input and output end centre lines.
10. The test method as claimed in claim 3, wherein the gas pressure sensor interface, the temperature sensor interface and the gas concentration sensor interface are distributed on the same section of the transparent pipe in a group, and are distributed along the transparent pipe in a plurality of groups at equal intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811476875.3A CN111272544A (en) | 2018-12-05 | 2018-12-05 | Test method for inducing composite dynamic disaster based on coal mine deep mining |
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| CN201811476875.3A CN111272544A (en) | 2018-12-05 | 2018-12-05 | Test method for inducing composite dynamic disaster based on coal mine deep mining |
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| CN111665135A (en) * | 2020-07-13 | 2020-09-15 | 中煤科工集团重庆研究院有限公司 | Testing device and method for contribution degree of elastic energy of roof rock mass to destabilization damage energy of coal-rock combination |
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