CN108894779B - Coal gas extraction borehole instability discrimination test device and method - Google Patents
Coal gas extraction borehole instability discrimination test device and method Download PDFInfo
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- CN108894779B CN108894779B CN201811073628.9A CN201811073628A CN108894779B CN 108894779 B CN108894779 B CN 108894779B CN 201811073628 A CN201811073628 A CN 201811073628A CN 108894779 B CN108894779 B CN 108894779B
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- 238000012360 testing method Methods 0.000 title claims abstract description 54
- 238000000605 extraction Methods 0.000 title claims abstract description 29
- 239000003034 coal gas Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 20
- 238000005553 drilling Methods 0.000 claims abstract description 87
- 238000005065 mining Methods 0.000 claims abstract description 23
- 238000011068 loading method Methods 0.000 claims abstract description 15
- 239000005341 toughened glass Substances 0.000 claims abstract description 12
- 238000010998 test method Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 239000003245 coal Substances 0.000 claims description 18
- 238000004088 simulation Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 11
- 238000003384 imaging method Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 9
- 239000010445 mica Substances 0.000 claims description 9
- 229910052618 mica group Inorganic materials 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 8
- 238000005056 compaction Methods 0.000 claims description 4
- 238000011161 development Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- XVIZMMSINIOIQP-UHFFFAOYSA-N 1,2-dichloro-3-(2-chlorophenyl)benzene Chemical compound ClC1=CC=CC(C=2C(=CC=CC=2)Cl)=C1Cl XVIZMMSINIOIQP-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000012237 artificial material Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000013028 emission testing Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
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- 235000019698 starch Nutrition 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
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- Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a coal gas extraction drilling instability discrimination test device which comprises a bearing bracket, a drilling device and a data testing and collecting system, wherein the bearing bracket is provided with a drilling device; the test box comprises a bottom plate, two ends of the bottom plate are symmetrically provided with fixed baffles, a toughened glass plate is arranged between the two fixed baffles, the top end of each fixed baffle is connected with an upper cover, and a plurality of hydraulic loading cylinders are arranged on the upper cover at equal intervals; the drilling device comprises a drilling machine, a lifting oil cylinder is movably connected to the side wall of the drilling machine, and a drill rod is arranged at the end part of the drilling machine; the data testing and collecting system comprises a pushing rod and stress sensors which are sequentially connected in series, and the stress sensors are connected with a computer through a concentrator. The invention also discloses a coal gas extraction borehole instability discrimination test method, which utilizes the device to further research the deformation damage rule of mining stress on the gas extraction borehole, and better improves the gas extraction rate of the borehole.
Description
Technical Field
The invention relates to the technical field of coal and gas co-mining, in particular to a coal gas extraction borehole instability discrimination test device and method.
Background
The gas explosion and the coal and gas outburst are one of the main types of coal mine disaster accidents in China, and the problem of gas overrun always threatens the safe and efficient production of mines, so that the improvement of the drilling extraction efficiency has important significance for the safe and efficient production on site.
However, as the soft coal body is subjected to strong geological structure movement and mining influence, stress around the drilling hole is redistributed to further misplacement the Kong Zhoumei body, the formed drilling hole collapses, a gas emission channel and a flow channel are blocked, so that the gas extraction rate is greatly reduced, the extraction effect is not ideal, and the coal mining safety is endangered.
Aiming at the problems that a soft coal seam gas drainage drill hole is easy to deform and collapse, a reasonable test platform for reproducing the influence of mining stress on the stability of the drill hole does not exist at present, most of the existing physical simulation test platforms are low in mechanization degree, the drill hole is manufactured manually, and no good monitoring means are provided for the change rule of the internal stress of the drill hole.
Disclosure of Invention
The invention aims to provide a coal gas extraction borehole instability discrimination test device and method, which are used for solving the problems of the prior art, further researching the deformation damage rule of mining stress on a gas extraction borehole and better improving the gas extraction rate of the borehole.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a coal gas extraction drilling instability discrimination test device which comprises a bearing bracket, a drilling device and a data testing and collecting system, wherein the bearing bracket is provided with a drilling device; the test box comprises a bottom plate, two ends of the bottom plate are symmetrically provided with fixed baffles, a toughened glass plate is arranged between the two fixed baffles, the top end of each fixed baffle is connected with an upper cover, and a plurality of hydraulic loading cylinders are arranged on the upper cover at equal intervals; the drilling device comprises a drilling machine, a lifting oil cylinder is movably connected to the side wall of the drilling machine, and a drill rod is arranged at the end part of the drilling machine; the data testing and collecting system comprises a pushing rod and stress sensors which are sequentially connected in series, and the stress sensors are connected with a computer through a concentrator.
Optionally, an upper cover opening oil cylinder is installed on the outer wall of the fixed baffle at one end, and the upper cover opening oil cylinder is fixedly connected with one end of the upper cover; the upper cover locking oil cylinder is arranged at the other end of the upper cover and can be fixedly connected with the outer wall of the fixed baffle at the other end.
Optionally, a tilting oil cylinder is installed on the bearing bracket, and the tilting oil cylinder is fixedly connected with the bottom plate.
Optionally, the tilting cylinder can control the overturning angle of the bottom plate to be 0-45 degrees.
Optionally, the fixed baffle is fixedly connected with the toughened glass plate through an electronic automatic lock catch.
Optionally, the side wall of the drilling machine is movably connected with the lifting oil cylinder by adopting a drilling machine tilting shaft; and the drilling machine is provided with a heat dissipation port.
Optionally, a data acquisition PCB is installed on the stress sensor.
Alternatively, the test chambers may have dimensions of 2000X 500X 1200mm in length X width X height, respectively.
The invention also provides a coal gas extraction borehole instability discrimination test method, which comprises the following steps:
step one: according to the data, according to the similarity ratio 1:100, building a simulation test bed, and layering rock strata by using mica sheets;
step two: manufacturing simulated stratum materials, respectively installing first layer of channel steel at the front and rear sides of a bearing bracket, paving the simulated materials in the first layer of channel steel, compacting, manufacturing joints on the surface of the first layer of the compacted materials, and uniformly scattering mica sheets for layering; and similarly, installing a second layer of channel steel after filling the first layer of channel steel layer by layer with the simulation materials, paving the simulation materials in the second layer of channel steel, compacting, then manufacturing joints on the surface of each layer of the compaction materials, and uniformly scattering mica sheets for layering;
step three: calculating the actual pressure of a coal seam in a place where the coal seam appears by volume weight and burial depth, loading an experimental model by a hydraulic system according to a similarity ratio to reach a target pressure and maintaining pressure stabilization until the similar simulation material is dried to reach a design requirement, removing channel steel on one side, cleaning the surface of the similar simulation material, and fixing a toughened glass plate on two fixed baffles of a similar physical model frame;
step four: selecting different drill rods according to experimental requirements by using a drilling device, manufacturing drilling holes with different conditions on a coal mining layer by adjusting a drilling machine tilting shaft and a lifting oil cylinder, checking and calibrating a drilling ultrasonic imaging system and a drilling stress sensor of an acoustic emission system, ensuring the reliability and the sensitivity of all test instruments, and finally arranging probes and stress sensors in different drilling holes respectively;
step five: simulating on-site working face exploitation, and simultaneously acquiring the integrity of rock mass around a borehole and the development degree of cracks in real time under the influence of exploitation by adopting a probe; accurately positioning the damage position inside the drill hole by utilizing an acoustic emission technology; and monitoring mining stress born by different points in the drill hole through the drill hole stress sensor, so as to analyze the influence of the advanced mining stress on each section of the drill hole.
Compared with the prior art, the invention has the following technical effects:
the experimental device can effectively simulate the crack evolution process around the drilling hole caused by surrounding rock stress under the influence of mining, and analyze the deformation damage mechanism of the drilling hole in the mining process; the test bed adopts a plurality of hydraulic cylinders to realize multi-point loading on the test bed, so that the upper coating load can be timely supplemented when the upper surface is uneven due to the collapse of the rock stratum; optimizing a test technology, and processing data by adopting an advanced drilling ultrasonic imaging test technology to obtain a hole wall three-dimensional stereogram; in addition, the independently developed miniature multipoint stress sensors are arranged in series, so that stress changes of different points in the drill hole are further tested; the drilling mode is optimized, the drilling device is designed by self, the accurate positioning of the drilling angle and the drilling position can be realized, and the error of manual drilling is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a coal gas extraction borehole instability discrimination test device provided by the invention;
FIG. 2 is a schematic structural view of a tempered glass sheet;
fig. 3 is a schematic structural view of a channel steel;
FIG. 4 is a schematic structural view of a drilling apparatus;
FIG. 5 is a schematic diagram of a data testing and acquisition system arrangement;
reference numerals illustrate: 1-upper cover opening cylinder, 2-upper cover, 3-bearing bracket, 4-light channel steel, 5-upper cover locking cylinder, 6-hydraulic loading cylinder, 7-tilting cylinder, 8-toughened glass plate, 9-electronic automatic lock catch, 10-fixed baffle, 11-drilling device, 12-drill rod, 13-drilling machine tilting shaft, 14-lifting cylinder, 15-stress sensor, 16-data acquisition PCB board, 17-drilling machine, 18-heat radiation port, 19-communication line, 20-computer, 21-concentrator, 22-propelling rod, 23-base plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a coal gas extraction borehole instability discrimination test device and method, which are used for solving the problems of the prior art, further researching the deformation damage rule of mining stress on a gas extraction borehole and better improving the gas extraction rate of the borehole.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The invention aims to provide a coal gas extraction drilling instability discrimination test device, which is shown in figures 1-5 and comprises a bearing bracket 3, a hydraulic loading system, a drilling device 11 and a data testing and collecting system; the bearing bracket 3 is provided with a test box, the test box comprises a bottom plate 23, two ends of the bottom plate 23 are symmetrically provided with fixed baffles 10, a toughened glass plate 8 is arranged between the two fixed baffles 10, the top end of the fixed baffle 10 is connected with an upper cover 2, and a plurality of hydraulic loading cylinders 6 are arranged on the upper cover 2 at equal intervals; the drilling device 11 comprises a drilling machine 17, a lifting oil cylinder 14 is movably connected to the side wall of the drilling machine 17 through a drilling machine tilting shaft 13, and a drill rod 12 is installed at the end part of the drilling machine 17; the data testing and collecting system comprises a pushing rod 22 and stress sensors 15 which are sequentially connected in series through a communication line 19, wherein the stress sensors 15 are connected with a computer 20 through a concentrator 21.
An upper cover opening oil cylinder 1 is arranged on the outer wall of the fixed baffle 10 at one end, and the upper cover opening oil cylinder 1 is fixedly connected with one end of the upper cover 2; the other end of the upper cover 2 is provided with an upper cover locking oil cylinder 5, and the upper cover locking oil cylinder 5 can be fixedly connected with the outer wall of a fixed baffle 10 at the other end. The bearing bracket 3 is provided with a tilting oil cylinder 7, and the tilting oil cylinder 7 is fixedly connected with the bottom plate 23; the tilting cylinder 7 can control the bottom plate 23 to drive the overturning angle of the test box to be 0-45 degrees; the fixed baffle 10 is fixedly connected with the toughened glass plate 8 through an electronic automatic lock catch 9.
The drilling machine 17 is provided with a heat dissipation port 18. The stress sensor 15 is provided with a data acquisition PCB 16. The test chambers had dimensions of 2000X 500X 1200mm in length, width and height, respectively.
Specifically, the bearing bracket 3 adopts an integral test box, the effective simulation size length x width x height is 2000 x 500 x 1200mm respectively, the periphery of the box body adopts a high-strength frame structure, and the bottom and the side of the test box body are provided with integral panels so as to ensure the strength in the motion process of the box body, and the deformation can not be generated. The bottom of the test box adopts a hydraulic cylinder to support the controllable test box, and the inclination angle of the test box can reach 45 degrees at maximum. Two surfaces of 2000X 1200mm are respectively made of aluminum alloy sections with single surfaces of 12 pieces of 2000X 100mm, and the electronic automatic lock catch 9 is adopted in a fixed mode. In order to further meet the test requirements, the maximum tiltable 45 degrees of the test chamber is controlled through the tilting oil cylinder 7.
The hydraulic loading system adopts a hydraulic multi-point pressurizing mode, each pressurizing point, namely the hydraulic loading oil cylinder 6 is respectively and independently controlled, the loading pressure is 20T, and the loading device and the test box body form a whole so as to always ensure the vertical pressure and the constant pressure of 20T with the test box body in the inclination angle change.
The drilling device 11 mainly comprises an electric drill and a clamp holder, so that deviation caused by manual drilling can be effectively avoided, the clamp holder can effectively fix the drilling machine 17 and accurately adjust the drilling angle, and in addition, the drilling machine 17 can replace drilling rods 12 with different lengths, diameters and types, so that experimental requirements of different drilling holes are met.
The data testing and acquisition comprises a borehole ultrasonic imaging system, a stress sensor 15 and an acoustic emission testing system. The stress sensors 15 are mainly arranged in series by four-point stress sensors, are fed into the drill hole through the pushing rod 22, and each sensor independently senses working pressure data in two directions which are axially symmetrical in the drill hole, and the pressure range is designed to be 50kg. The acoustic emission system accurately locates the damage position of the coal rock in the test process, and quantitatively characterizes damage of mining stress to drilling holes by accumulating event numbers. The drilling ultrasonic imaging system comprises a data acquisition control host system and a computer display system, the core part is an ABI40 probe, an advanced acoustic wave beam focusing technology, a digital recording technology, a digital data processing technology and the like are adopted, the drilling ultrasonic imaging system is a high-resolution drilling imaging instrument, the resolution is 0.1mm gap width, the inclination angle precision of the probe detection structure face is +/-0.5 degrees, the emitted ultrasonic frequency is 1.2MHz, the ultrasonic wave beam size is 1.5mm multiplied by 1.5mm, the testing operation and the data recording are all automatically controlled by an Mslog software system, and the data are analyzed and processed by WellCAD.
The coal gas extraction borehole instability discrimination test device comprises the following operation steps:
step one: the geological conditions and exploitation technology of the studied mine are familiar, the proportion of similar physical simulation materials of each simulated stratum is designed according to the collected data, the actual mine is taken as a prototype, and artificial materials with similar physical and mechanical properties to natural rock such as river sand, gypsum and starch are used according to the similarity ratio 1:100, building a simulation test bed, and layering rock strata by using mica sheets. Variables studied in this experiment were determined as: the drilling diameter, the drilling inclination angle, the drilling type, the pushing rate, the coal seam inclination angle and other factors are used for researching the damage instability of mining stress to drilling under different conditions at different pushing speeds in order to be more in line with the actual working conditions of the site.
Step two: manufacturing simulated stratum materials according to the proportion of the similar simulated materials, respectively installing a first layer of light channel steel 4 at the front and rear sides of a bearing bracket 3 of a similar physical model, paving the simulated materials in the first layer of light channel steel 4, compacting by adopting a flat-plate portable troweling machine, manufacturing joints on the surface of the first layer of the solid materials, and uniformly scattering mica sheets for layering; and similarly, when the simulation materials fill the first layer of light channel steel 4 layer by layer, the second layer of light channel steel 4 is installed, the simulation materials are paved in the second layer of light channel steel 4, a flat-plate portable troweling machine is used for compaction, and then joints are manufactured on the surface of each layer of the compaction materials, and mica sheets are uniformly scattered for layering.
Step three: the actual pressure of the coal seam in the place where the coal seam appears is calculated through the volume weight and the burial depth, the hydraulic loading oil cylinder 6 is used for loading the experimental model according to the similarity ratio to reach the target pressure and maintain the pressure stabilization until the similar simulation material dries to reach the design requirement, then the light channel steel 4 on one side is removed, the surface of the similar simulation material is cleaned, and the toughened glass plate 8 is fixed on the left fixed baffle plate 10 and the right fixed baffle plate 10 of the similar physical model frame.
Step four: and the drilling device 11 is utilized to select different drill rods 12 according to experimental requirements, drilling holes with different conditions are manufactured on a coal seam through adjusting the drilling machine tilting shaft 13 and the lifting oil cylinder 14, then an acoustic emission system, a drilling ultrasonic imaging system and a stress sensor 15 are checked and calibrated, reliability and sensitivity of all test instruments are ensured, and finally an ABI40 probe and a multi-point stress sensor are respectively arranged in the different drilling holes.
Step five: simulating on-site working face mining according to a certain excavation rate, and simultaneously acquiring the integrity of rock mass around a drill hole and the development degree of cracks under the influence of mining in real time by adopting an ABI40 probe; accurately positioning the damage position inside the drill hole by utilizing an acoustic emission technology; and monitoring mining stress born by different points in the drill hole through the drill hole stress sensor, so as to analyze the influence of the advanced mining stress on each section of the drill hole.
The experimental data collected by the testing means are arranged and analyzed, firstly, through carrying out binarization treatment on the surface fracture pictures of the drilling holes at each stage of the experiment, the fracture evolution process is analyzed to obtain the surface damage morphological characteristics of the instability of the drilling holes; secondly, drawing mining stress variation curves of different drilling holes along with distance according to data acquired by stress sensors in the drilling holes, and quantitatively obtaining stress variation curves of drilling hole damage by comparing lead supporting stress reduction areas, heightening areas and stabilizing areas obtained by different measuring points; then, the reflection capability of substances with different densities and intensities on ultrasonic waves is utilized, the intensity and the change of the color reflect the intensity of ultrasonic reflection signals, namely reflect the lithology and the intensity difference of the borehole wall, so that the system software WellCAD is used for processing test data to obtain a three-dimensional ultrasonic imaging stereogram of the borehole wall, an expanded plane drawing of ultrasonic imaging of the borehole wall and a statistical polar diagram of joint cracks of a structural surface of the borehole wall, thereby accurately evaluating the integrity of the rock mass of the borehole and the development degree of the cracks. And finally, quantitatively characterizing the influence of the mining process on the stability of the drilling hole by using the acoustic emission accumulated event number, and further accurately positioning the distribution condition of damaged microcracks in the coal body around the drilling hole.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. A coal gas extraction borehole instability discrimination test method is characterized in that: the device comprises a bearing bracket, a drilling device and a data testing and collecting system; the test box comprises a bottom plate, two ends of the bottom plate are symmetrically provided with fixed baffles, a toughened glass plate is arranged between the two fixed baffles, the top end of each fixed baffle is connected with an upper cover, and a plurality of hydraulic loading cylinders are arranged on the upper cover at equal intervals; the drilling device comprises a drilling machine, a lifting oil cylinder is movably connected to the side wall of the drilling machine, and a drill rod is arranged at the end part of the drilling machine; the data testing and collecting system comprises a pushing rod and stress sensors which are sequentially connected in series, wherein the stress sensors are connected with a computer through a concentrator; the method comprises the following steps:
step one: according to the data, according to the similarity ratio 1:100, building a simulation test bed, and layering rock strata by using mica sheets;
step two: manufacturing simulated stratum materials, respectively installing first layer of channel steel at the front and rear sides of a bearing bracket, paving the simulated materials in the first layer of channel steel, compacting, manufacturing joints on the surface of the first layer of the compacted materials, and uniformly scattering mica sheets for layering; and similarly, installing a second layer of channel steel after filling the first layer of channel steel layer by layer with the simulation materials, paving the simulation materials in the second layer of channel steel, compacting, then manufacturing joints on the surface of each layer of the compaction materials, and uniformly scattering mica sheets for layering;
step three: calculating the actual pressure of a coal seam in a place where the coal seam appears by volume weight and burial depth, loading an experimental model by a hydraulic system according to a similarity ratio to reach a target pressure and maintaining pressure stabilization until the similar simulation material is dried to reach a design requirement, removing channel steel on one side, cleaning the surface of the similar simulation material, and fixing a toughened glass plate on two fixed baffles of a similar physical model frame;
step four: selecting different drill rods according to experimental requirements by using a drilling device, manufacturing drilling holes with different conditions on a coal mining layer by adjusting a drilling machine tilting shaft and a lifting oil cylinder, checking and calibrating a drilling ultrasonic imaging system and a drilling stress sensor of an acoustic emission system, ensuring the reliability and the sensitivity of all test instruments, and finally arranging probes and stress sensors in different drilling holes respectively;
step five: simulating on-site working face exploitation, and simultaneously acquiring the integrity of rock mass around a borehole and the development degree of cracks in real time under the influence of exploitation by adopting a probe; accurately positioning the damage position inside the drill hole by utilizing an acoustic emission technology; and monitoring mining stress born by different points in the drill hole through the drill hole stress sensor, so as to analyze the influence of the advanced mining stress on each section of the drill hole.
2. The coal gas extraction borehole instability discrimination test method according to claim 1, wherein the method is characterized in that: an upper cover opening oil cylinder is arranged on the outer wall of the fixed baffle at one end and is fixedly connected with one end of the upper cover; the upper cover locking oil cylinder is arranged at the other end of the upper cover and can be fixedly connected with the outer wall of the fixed baffle at the other end.
3. The coal gas extraction borehole instability discrimination test method according to claim 1, wherein the method is characterized in that: and the bearing bracket is provided with a tilting oil cylinder which is fixedly connected with the bottom plate.
4. The coal gas extraction borehole instability discrimination test method according to claim 3, wherein the method is characterized in that: the tilting oil cylinder can control the overturning angle of the bottom plate to be 0-45 degrees.
5. The coal gas extraction borehole instability discrimination test method according to claim 1, wherein the method is characterized in that: the fixed baffle plate is fixedly connected with the toughened glass plate through an electronic automatic lock catch.
6. The coal gas extraction borehole instability discrimination test method according to claim 1, wherein the method is characterized in that: the side wall of the drilling machine is movably connected with the lifting oil cylinder by adopting a drilling machine tilting shaft; and the drilling machine is provided with a heat dissipation port.
7. The coal gas extraction borehole instability discrimination test method according to claim 1, wherein the method is characterized in that: and a data acquisition PCB is arranged on the stress sensor.
8. The coal gas extraction borehole instability discrimination test method according to claim 1, wherein the method is characterized in that: the test chambers were 2000X 500X 1200mm in length, width and height, respectively.
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| CN111220788B (en) * | 2020-01-21 | 2022-05-31 | 山东科技大学 | Similar material simulation test system for working face roadside roof-cutting entry retaining and use method |
| CN111929214B (en) * | 2020-07-13 | 2024-04-19 | 西安科技大学 | Experimental device and method for coal bed gas seepage and coal adsorption and desorption methane under ultrasonic action |
| CN113818841B (en) * | 2021-09-22 | 2023-04-18 | 华北科技学院(中国煤矿安全技术培训中心) | Triaxial loaded gas drainage simulation platform |
| CN113700477B (en) * | 2021-09-26 | 2024-01-05 | 太原理工大学 | Device and method for detecting coal gas parameters at lower part of steep goaf |
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