CN114113224A - Microcurrent testing system and method under concentrated stress of coal and rock - Google Patents
Microcurrent testing system and method under concentrated stress of coal and rock Download PDFInfo
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- CN114113224A CN114113224A CN202111436767.5A CN202111436767A CN114113224A CN 114113224 A CN114113224 A CN 114113224A CN 202111436767 A CN202111436767 A CN 202111436767A CN 114113224 A CN114113224 A CN 114113224A
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- 239000003245 coal Substances 0.000 title claims abstract description 46
- 239000011435 rock Substances 0.000 title claims abstract description 39
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title abstract description 25
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 31
- 239000010935 stainless steel Substances 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 43
- 229910052802 copper Inorganic materials 0.000 claims description 43
- 239000010949 copper Substances 0.000 claims description 43
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The invention discloses a system and a method for testing micro-current under coal rock concentrated stress, wherein the system for testing micro-current under coal rock concentrated stress comprises an electromagnetic shielding system, a loading system and a micro-current acquisition system, and mainly comprises an electromagnetic shielding chamber, a signal transfer plate, a wave filtering tube, a micro-control servo press, a press control console, an insulating gasket, a stainless steel cushion block, an electrometer, a radio frequency connecting wire, an electric signal data transmission line and a computer. The method for testing the micro-current under the coal rock concentrated stress can be used for collecting current signals in the deformation and damage process of the coal rock sample subjected to the concentrated load, can avoid abnormal signals caused by friction, dislocation and falling of electrodes, can greatly reduce interference signals in the environment, further realizes the simulation of the current response rule of the coal body concentrated stress change process in front of a stope face, and provides technical support for researching the mechanical characteristics and the current change rule of the coal rock loaded damage process.
Description
Technical Field
The invention relates to a system and a method for monitoring micro-current in a coal rock deformation destruction process, in particular to a system and a method for testing the micro-current under concentrated stress of coal rock.
Background
Coal and rock dynamic disasters such as rock burst, coal and gas outburst and the like are accompanied in the coal mining process, casualties and property losses are often caused, the safety and efficient production of coal mines are seriously threatened, and the monitoring and early warning of the rock burst are effective means for preventing the disasters. The geophysical method has the advantages of nondestructive detection, high efficiency, convenience, low cost and the like, and plays an increasingly important role in monitoring coal and rock dynamic disasters in recent years. Experimental research shows that the coal and rock can excite micro-current in the loading process, the intensity of the excitation current is closely related to the stress, deformation, cracking and the like of the coal and rock, and the change of the excitation current can reflect the stress and internal damage conditions of the coal and rock. In the coal seam mining process, a stress relaxation area, a stress concentration area and an original stress area sequentially exist in a coal body in front of a working face, and dynamic disasters can occur in the stress concentration area more easily, so that the stress relaxation area is a key area for monitoring the dynamic disasters.
At present, the method adopted for testing the micro-current in the coal rock loading process in a laboratory is that electrodes are usually pasted on the surface of a standard sample to integrally load the sample, and a shielding net is used for shielding the sample. The method has the following defects: (1) in the loading process, the compression, expansion, cracking and the like of the coal rock sample can cause the phenomena of friction, dislocation, even electrode falling and the like between the surface of the sample and an electrode plate, and generate a plurality of abnormal currents; (2) the relationship between current flow direction and stress gradient cannot be determined; (3) the current response rule of the concentrated stress change process of the coal body in front of the stope face cannot be simulated; (4) the signal transmission line passes through the shielding net to influence the shielding effect, so that more interference signals enter.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical defects, the system and the method for testing the micro-current in the coal rock loading process are simple in structure and convenient to operate, can simulate and monitor the change rule of the exciting current under the concentrated stress of the coal rock, and can effectively inhibit the generation of interference signals.
The technical scheme is as follows: a micro-current testing system under coal rock concentrated stress comprises an electromagnetic shielding system, a loading system and a micro-current collecting system, and mainly comprises an electromagnetic shielding chamber, a signal adapter plate, a wave filtering tube, a micro-control servo press, a press control console, an insulating gasket, a stainless steel cushion block, an electrometer, a radio frequency connecting wire, an electric signal data transmission line and a computer; the micro-control servo press is arranged in the electromagnetic shielding chamber and is connected with a press control console outside the electromagnetic shielding chamber through a cable and an oil pipe penetrating through a filtering wave tube; the electrometer is arranged outside the electromagnetic shielding chamber and is connected with a signal adapter plate on the electromagnetic shielding chamber through a radio frequency connecting wire; and one end of the electric signal data transmission line is connected with the signal adapter plate, and the other end of the electric signal data transmission line is connected with the copper electrode plate.
Further, the signal adapter plate comprises a board with a drilled hole, a 300-mesh copper net and three coaxial BNC adapters, wherein the copper net covers two sides of the board, and the three coaxial BNC adapters are fixed with the board through small holes and are in close contact with the copper net; the radio frequency connecting wire is a shielding cable, and two ends of the radio frequency connecting wire are connected with three coaxial BNC interfaces.
Furthermore, the micro-current is collected by a copper electrode plate, the copper electrode plate is pasted on the surface of one end of the non-loaded part of the sample, the copper electrode plate is pasted on the surface of the stainless steel cushion block, the copper electrode plate is coupled with the sample and the stainless steel cushion block by conductive adhesive, and the copper electrode plate is fixed by an insulating adhesive tape.
Furthermore, one end of the current data transmission line is connected with a BNC interface and is connected with a three-coaxial BNC adapter on the signal adapter plate, the positive electrode at the tail end is connected with the copper electrode plate, the negative electrode is connected with the copper electrode plate, and the shielding electrode is in air connection.
Furthermore, the copper electrode plate is connected with a grounding port on the shielding chamber through a wire, and the grounding port is grounded.
Furthermore, an insulating gasket is laid on the upper surface of the press workbench, and the insulating gasket is placed between the stainless steel cushion block and the press head.
Further, the computer is connected with the electrometer and used for displaying, storing and processing the current data.
A test method of a micro-current test system under coal rock concentrated stress comprises the following steps:
the first step is as follows: assembling a micro-current test system under the concentrated stress of the coal rock;
the second step is that: firstly, placing an insulating gasket on a press workbench, placing a coal rock sample on the insulating gasket, and adjusting the sample to enable a loaded part to be positioned at the center of the press workbench; then respectively sticking the copper electrode plate and the copper electrode plate on the surface of the non-loaded side of the sample and the surface of the stainless steel cushion block by conductive adhesive, and fixing by using an insulating adhesive tape; placing a stainless steel cushion block at the upper end of the loaded part of the sample, adjusting the stainless steel cushion block to enable the center of the stainless steel cushion block and the center of a press workbench to be in the same axis, and then placing an insulating cushion block on the stainless steel cushion block;
the third step: after the insulating gasket, the sample, the electrode and the stainless steel gasket are arranged, connecting the positive electrode of the electric signal data transmission line into the copper electrode plate, connecting the negative electrode of the electric signal data transmission line into the copper electrode plate and connecting the shielding layer electrode in an air-connecting mode;
the fourth step: after the electric signal data transmission line is connected with the electrode, firstly, the micro-control servo press and the electrometer are opened, then the press is adjusted to enable the pressure head to be in slight contact with the upper insulating gasket, the load is increased to 10N at the speed of 0.1 mm/min, and the current is waited to be recovered stably;
the fifth step: after the current is stable, loading the sample according to the test scheme, and simultaneously acquiring a current signal;
and a sixth step: after the coal rock sample is crushed, closing the micro-control servo press and the electrometer, taking down a copper electrode plate on the sample, moving down a stainless steel cushion block and an insulating gasket, and cleaning the sample;
the seventh step: and (5) completing the test, disassembling the device and arranging the instrument.
Has the advantages that: the system and the method for testing the micro-current under the coal rock concentrated stress can collect the micro-current in the deformation and damage process of the coal rock sample subjected to the concentrated load, can avoid abnormal signals caused by friction, dislocation and falling of the electrodes, can greatly reduce interference signals in the environment, further realize the current response rule of the concentrated stress change process of the coal body in front of the stope face, and provide technical support for researching the mechanical characteristics and the current change rule of the coal rock loaded damage process.
Drawings
FIG. 1 is a schematic diagram of a micro-current testing system under concentrated stress of coal rocks;
fig. 2 is a schematic diagram of a signal patch panel.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a microcurrent testing system under concentrated stress of coal rock comprises an electromagnetic shielding chamber 1, a signal adapter plate 2, a filter tube 3, a micro-control servo press 4, a press control console 7, an insulating gasket 8, a stainless steel cushion block 13, an electrometer 15, a radio frequency connecting wire 16, an electric signal data transmission wire 17 and a computer 20; the micro-control servo press 4 is arranged in the electromagnetic shielding chamber 1 and is connected with a press control console 7 outside the electromagnetic shielding chamber 1 through a cable 5 and an oil pipe 6 which penetrate through the filtering wave tube 3; the micro-control servo press 4 and the stainless steel cushion block 13 are used for applying concentrated load to the sample, and the press control console 7 is used for controlling the micro-control servo press 4; the electrometer 15 is arranged outside the electromagnetic shielding chamber 1 and is connected with the signal adapter plate 2 on the electromagnetic shielding chamber 1 through a radio frequency connecting wire 16; one end of an electric signal data transmission line 17 is connected with the signal adapter plate 2, the positive electrode of the tail end is connected with the copper electrode plate 11, the negative electrode of the tail end is connected with the copper electrode plate 12, and the shielding electrode is in air connection; the electrode slice 12 is connected with a grounding port 19 on the electromagnetic shielding chamber 1 through a lead 18, and the grounding port 19 is grounded; a computer 20 is connected to the electrometer 15 for displaying, storing and processing the current data.
As shown in fig. 1, the signal adapter plate 2 comprises a board with a drilled hole 21, a 300-mesh copper mesh 22 and three coaxial BNC adapters 23, wherein the 300-mesh copper mesh 22 covers two sides of the board with a drilled hole 21, and the three coaxial BNC adapters 23 are fixed with the board 21 through small holes and are in close contact with the copper mesh 22.
A test method of a micro-current test system under coal rock concentrated stress comprises the following steps:
the first step is as follows: assembling a micro-current test system under the concentrated stress of the coal rock;
the second step is that: firstly, placing an insulating gasket 8 on a press workbench 9, placing a test sample 10 on the insulating gasket 8, and adjusting the test sample 10 to enable a loaded part to be positioned at the center of the press workbench 9; then respectively sticking the copper electrode plate 11 and the copper electrode plate 12 on the surface of the non-loaded side of the sample 10 and the surface of the stainless steel cushion block 13 through conductive adhesive, and fixing the surfaces by using an insulating adhesive tape; placing a stainless steel cushion block 13 at the upper end of the loaded part of the sample 10, adjusting the stainless steel cushion block 13 to enable the center of the stainless steel cushion block 13 and the center of a press workbench to be in the same axis, and then placing an insulating gasket 8 on the stainless steel cushion block 13;
the third step: connecting the positive electrode of the electric signal data transmission line 17 into the copper electrode plate 11, connecting the negative electrode of the electric signal data transmission line into the copper electrode plate 12, and connecting the electrodes of the shielding layers in an air-to-air mode;
the fourth step: firstly, opening the micro-control servo press 4 and the electrometer 15, then adjusting the micro-control servo press 4 to enable the pressure head 14 to be in slight contact with the upper insulating gasket 8, increasing the load to 10N at the speed of 0.1 mm/min, and waiting for the current to recover stably;
the fifth step: after the current is stable, loading the sample according to the test scheme, and simultaneously acquiring a current signal;
and a sixth step: after the coal rock sample is crushed, closing the micro-control servo press 4 and the electrometer 15, taking down the copper electrode plate 11 on the sample 10, moving down the stainless steel cushion block 13 and the insulating gasket 8, and cleaning the crushed sample;
the seventh step: and (5) completing the test, disassembling the device and arranging the instrument.
Claims (4)
1. A little current test system under coal petrography concentrated stress which characterized in that: the electromagnetic shielding device comprises an electromagnetic shielding system, a loading system and a micro-current acquisition system, wherein the loading system comprises a micro-control servo press (4) arranged in an electromagnetic shielding chamber (1) and a press control console arranged outside the electromagnetic shielding chamber (1), the current acquisition system comprises an electrometer (15) and an acquisition circuit, the electrometer is arranged outside the electromagnetic shielding chamber (1), the electromagnetic shielding system comprises a signal adapter plate (2), and the signal adapter plate comprises a board with a drilled hole (21), a copper net (22) and a triaxial BNC adapter (23); the copper net (22) covers two sides of the wood board (21) with the drilled hole, the three coaxial BNC adapters (23) penetrate through the copper net (22) and are fixed in the drilled hole, the two surfaces of the three coaxial BNC adapters are symmetrical, the three coaxial BNC adapters and the copper net are kept compact, and the electrometer (15) is connected with the signal adapter plate (2) on the electromagnetic shielding chamber (1) through the radio frequency connecting line (16); one end of an electrical signal data transmission line (17) is connected with the signal adapter plate (2), the other end of the electrical signal data transmission line is respectively connected with the copper electrode plate (11) and the copper electrode plate (12), the positive pole of the electrical signal data transmission line (17) is connected with the copper electrode plate (11), the negative pole of the electrical signal data transmission line is connected with the copper electrode plate (12), and the shielding pole is in idle connection; the copper electrode plate (12) is connected with a grounding port (19) through a lead (18), and the grounding port (19) is grounded.
2. The system for testing micro-current under coal rock concentrated stress according to claim 1, wherein: the device also comprises a filter tube (3), a micro-control servo press (4), a press control table (7), an insulating gasket (8), a stainless steel gasket (13) and a computer (20);
the micro-control servo press is connected with a press control console (7) outside the electromagnetic shielding chamber (1) through a cable (5) penetrating through the filtering wave tube (3) and an oil pipe (6); the press control console (7) is used for controlling the micro-control servo press (4) and displaying, storing and processing mechanical parameter data; the computer (20) is connected with the electrometer (15) and is used for displaying, storing and processing micro-current data; the micro-control servo press (4) and the stainless steel cushion block (13) are used for applying concentrated load to the sample (10).
3. The system for testing micro-current under coal rock concentrated stress according to claim 2, wherein: the copper electrode plate (11) and the copper electrode plate (12) are respectively stuck to the surface of the non-loaded end of the sample (10) and the side surface of the stainless steel cushion block (13) through conductive adhesive, and are fixed by using an insulating adhesive tape; the test sample (10) is placed on an insulating gasket (8) which is tiled on a press workbench (9), the stainless steel cushion block (13) is placed above the loaded end of the test sample (10), and the other insulating gasket (10) is placed on the stainless steel cushion block (13).
4. A test method of a micro-current test system under coal rock concentrated stress is used for the micro-current test system under coal rock concentrated stress according to claim 3, and is characterized by comprising the following steps:
firstly, placing an insulating gasket (8) on a press workbench (9), placing a coal rock sample (10) on the insulating gasket (8), and adjusting the sample (10) to enable a loaded part to be positioned at the center of the press workbench (9); then respectively sticking a copper electrode plate (11) and a copper electrode plate (12) on the surface of the unloaded side of the sample (10) and the surface of a stainless steel cushion block (13) through conductive adhesive, and fixing the surfaces by using an insulating adhesive tape; placing a stainless steel cushion block (13) at the upper end of the loaded part of the sample (10), adjusting the stainless steel cushion block (13) to enable the center of the stainless steel cushion block and the center of the press workbench (9) to be in the same axis, and then placing an insulating gasket (8) on the stainless steel cushion block (13);
connecting an electric signal data transmission line (17) with a triaxial BNC adapter (23) on a signal adapter plate (2), and then connecting the positive electrode of the electric signal data transmission line (17) with a copper electrode plate (11), connecting the negative electrode of the electric signal data transmission line with a copper electrode plate (12) and connecting the shielding layer electrodes in an air-to-air mode;
opening the micro-control servo press (4) and the electrometer (15), then adjusting the micro-control servo press (4) to enable the pressure head (14) to slightly contact with the upper insulating gasket (8), adjusting the load to 10N at the speed of 0.1 mm/min, and waiting for the current to recover stably;
after the current is stable, loading the sample (10) according to a test scheme, simultaneously collecting the current, and storing the current data in a computer (20);
after the coal rock sample is crushed, the micro-control servo press (4) and the electrometer (15) are closed, a copper electrode plate (11) on the sample is taken down, a stainless steel cushion block (13) and an insulating gasket (8) are moved down, and the sample (10) is cleaned.
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| CN202111436767.5A CN114113224B (en) | 2021-11-30 | 2021-11-30 | Microcurrent testing system and method under concentrated stress of coal and rock |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118008251A (en) * | 2024-04-10 | 2024-05-10 | 太原理工大学 | Electromagnetic automatic measurement device and method for drilling speed of middle-deep geothermal well |
| CN119341323A (en) * | 2024-10-21 | 2025-01-21 | 中国矿业大学 | Micro-current extraction and energy storage system for loaded coal and rock |
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