CN106989849B - Single-hole coal-rock mass directional stress distribution and deformation integrated monitoring device and monitoring method - Google Patents
Single-hole coal-rock mass directional stress distribution and deformation integrated monitoring device and monitoring method Download PDFInfo
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- CN106989849B CN106989849B CN201710340810.5A CN201710340810A CN106989849B CN 106989849 B CN106989849 B CN 106989849B CN 201710340810 A CN201710340810 A CN 201710340810A CN 106989849 B CN106989849 B CN 106989849B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/02—Measuring force or stress, in general by hydraulic or pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/24—Measuring arrangements characterised by the use of fluids for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
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Abstract
The invention discloses a single-hole coal rock mass directional stress distribution and deformation integrated monitoring device and a monitoring method, and the device comprises a plurality of capsule pressure sensors, a three-way electromagnetic valve, a connecting pipe, a multi-channel displacement monitor, a multi-channel pressure monitor, a steel wire rope, an installation guide rail and the like; according to the monitoring scheme, a plurality of capsule pressure sensors are arranged in a drill hole, the hydraulic pressure in each capsule pressure sensor reaches a preset value through a liquid injection device, the capsule pressure sensors are well coupled with the coal-rock mass, and a deformation monitoring point is attached to the shell of each capsule pressure sensor, so that the deformation monitoring point is reliably fixed, and the consistency of stress monitoring and deformation monitoring of the coal-rock mass is ensured; after the monitoring is finished, all the electromagnetic control valves are opened, the liquid in the capsule flows back, the mounting guide rail is moved out from the probing hole, and the recovery is finished. The invention overcomes the problems of poor monitoring adaptability and consistency, high monitoring cost, unrecyclable equipment and the like of the traditional drilling stress monitoring equipment aiming at mining stress and coal-rock body deformation.
Description
Technical Field
The invention belongs to the field of monitoring of mining induced stress and coal-rock mass deformation, and particularly relates to a recyclable single-hole coal-rock mass directional stress distribution and deformation integrated monitoring device.
Background
Along with the increase of the coal mining depth in China, the coal rock instability phenomenon of surrounding rocks around a stope caused by mining stress is increasingly serious, and the surrounding rock stress of a mining space is more complex. The mining of the working face breaks the balance state of the stress of the original rock, and the surrounding rock deforms and moves and the stress is redistributed. The stability of surrounding rocks of stopes and stoping roadways mainly depends on the strength and the stress condition of the surrounding rocks and the interaction relation between support and surrounding rock deformation, wherein the stress condition of the surrounding rocks is a main factor for determining the stability of the surrounding rocks, and the surrounding rock deformation is an important index of the stability of the surrounding rocks. Therefore, monitoring of stress and deformation of stopes and surrounding rocks of the roadways is a decision basis for solving important technical problems of roadway mine pressure control, reserved coal pillar width design, roadway maintenance and the like which are influenced by mining. Meanwhile, the real-time monitoring research on the deformation and stress distribution of the mining surrounding rock is beneficial to disclosing the deformation, stress distribution and evolution rule of the mining space surrounding rock, and provides technical support for accurately preventing coal rock dynamic disasters.
Along with the influence of mining, the stress size of the pressure relief area, the stress concentration area, the same axis different position, direction in the coal rock body appear is different, and the current drilling stress monitoring equipment in the market such as 36-2 drilling deformation meter, UNSW hollow inclusion strain gauge and YZ series hydraulic pillow etc. the device focus on single point stress monitoring, and the shortcoming of these equipment is: 1. the multi-drill hole stress distribution monitoring scheme inevitably causes great disturbance to the coal rock mass; 2. the directional stress distribution and surrounding rock deformation of the coal rock mass at multiple points on a single axis cannot be synchronously monitored; 3. the method for placing sensors at different depths of different drill holes to monitor the stress and deformation in the coal rock mass is difficult to ensure that the different drill holes keep consistent installation directions and drill hole angles; the invention discloses a multipoint coal rock stress real-time monitoring device and a multipoint coal rock stress real-time monitoring method (patent number: CN 104132761B). capsules are connected in series through a high-pressure oil pipe and are conveyed into a drill hole, and the relative position of a monitoring unit is fixed, so that the directional stress and displacement integrated monitoring cannot be realized, and the device is damaged due to excessive rock deformation or the monitoring unit is separated from a designed monitoring position to influence the data accuracy. Therefore, a single-hole multi-point surrounding rock directional stress and deformation integrated real-time monitoring device is urgently needed, and therefore the device is more suitable for engineering application.
Disclosure of Invention
The invention provides a recyclable single-hole coal-rock mass directional stress distribution and deformation integrated monitoring device, aiming at solving the problems of poor mining stress and coal-rock mass deformation monitoring adaptability and consistency, high monitoring cost, unrecyclable equipment and the like of the conventional drilling stress monitoring equipment.
The invention also provides a method for monitoring the directional stress distribution and deformation of the rock mass by using the monitoring device.
In order to achieve the purpose, the invention adopts the technical scheme that:
a single-hole coal rock mass directional stress distribution and deformation integrated monitoring device comprises a plurality of capsule pressure sensors connected in series, a multi-channel pressure monitor, a multi-channel displacement monitor and a set of liquid injection device; the capsule pressure sensor structure is: comprises a shell, the upper surface and the lower surface of the shell are capsule-shaped elastic surfaces, thereby forming a capsule-shaped shell; four corners of the left end and the right end of the shell are provided with guide rail grooves, and the capsule sensor is clamped on the drilling track through the guide rail grooves; a two-position three-way electromagnetic valve is arranged in the shell and is controlled by a control circuit, and the control circuit is formed by electrically connecting a liquid pressure sensor, a voltage amplifier and a control switch; the control circuit of each capsule pressure sensor is respectively connected to one channel of the multi-channel pressure monitor through a cable; the two-position three-way electromagnetic valve is provided with an upper liquid through port, a lower liquid through port and a side liquid through port, the upper liquid through port and the lower liquid through port are respectively used as a liquid outlet and a liquid inlet, the side liquid through port is communicated with the inner cavity of the shell, and the liquid inlet and the liquid outlet of each capsule pressure sensor are sequentially connected in series through a hydraulic hose to form a passage and then connected with a liquid injection device arranged outside the drill hole; a steel wire rope fixing bolt is fixed on one side surface of the shell, and a steel wire rope of each capsule pressure sensor is respectively connected to one channel of the multi-channel displacement monitor; the multi-channel pressure monitor transmits data to a remote monitoring center through a monitoring substation; the multi-channel displacement monitor consists of a plurality of stay wire type displacement sensors and transmits data to a remote monitoring center through a monitoring substation; the liquid injection device needs to keep stable hydraulic pressure in the working process.
In order to avoid the damage to equipment caused by large deformation of the coal rock mass, the lengths of the hydraulic hose and the cable are required to be larger than the installation length.
The method for monitoring the directional stress distribution and deformation of the coal rock mass by using the monitoring device comprises the following steps:
the first step is as follows: determining a monitoring area, a drilling position, a drilling depth, a monitoring position, a monitoring stress direction and a monitoring point number according to a monitoring scheme, drilling to a preset depth, and then installing a guide rail in the drilling hole;
the second step is that: sequentially connecting all the capsule pressure sensors in series, wherein when the capsule pressure sensors are connected in series, the length of a hydraulic hose is required to be larger than the distance between preset monitoring points; numbering the capsule pressure sensors from front to back in sequence according to the drilling direction as the front;
the third step: the capsule pressure sensors connected in series are pushed into the drill hole to the deepest position along the guide rail, the positions of the capsule pressure sensors in the drill hole are judged according to the length of the exposed steel wire rope of each capsule pressure sensor, and the capsule pressure sensors are adjusted through drawing the steel wire rope, so that each monitoring point is provided with the capsule pressure sensors; then connecting the steel wire rope of each capsule pressure sensor with a multi-channel displacement monitor outside the hole, and connecting a control circuit of each capsule pressure sensor with the multi-channel pressure monitor outside the hole; the hydraulic hose is connected with a liquid injection device outside the hole;
the fourth step: opening the side liquid through ports of all the two-position three-way electromagnetic valves, injecting liquid into the hydraulic hose through a liquid injection device, enabling the liquid to flow to the inner cavities of all the capsule pressure sensors through the side liquid through ports of the opened two-position three-way electromagnetic valves, closing the side liquid through ports of all the two-position three-way electromagnetic valves when the inner cavities of all the capsule pressure sensors are filled with the liquid and the hydraulic pressure is stable, and enabling the hydraulic pressure to be the set pressure;
the fifth step: when surrounding rock deforms, a capsule-shaped elastic surface of the capsule pressure sensor is extruded, a liquid pressure sensor in the capsule pressure sensor senses the stress of the coal rock mass, and the pressure sensed by each liquid pressure sensor is acquired by a multi-channel pressure monitor in real time; when the liquid pressure in the inner cavity of the capsule pressure sensor with a certain number reaches the upper limit value of the pressure which can be borne by the shell of the capsule pressure sensor, opening a side liquid through port of a two-position three-way electromagnetic valve in the capsule pressure sensor, wherein the upper limit value at the moment is the monitoring value at the time, and subtracting the set pressure value from the monitoring value to obtain the coal rock stress change value monitored at the time; when the liquid flows back to the grouting device and the hydraulic pressure is restored to the set pressure value, closing the side liquid inlet of the capsule pressure sensor again, continuing to monitor the stress of the coal rock mass, and repeating the steps until the stress of the coal rock mass is monitored and is not changed any more; summing the stress change values of the coal rock mass which are monitored for many times, namely obtaining the total change value of the stress of the coal rock mass of the monitoring point corresponding to the capsule pressure sensor;
the purpose of the multiple monitoring is to prevent the capsule surface of the capsule pressure sensor from being damaged due to overlarge hydraulic pressure.
And a sixth step: and after monitoring of all monitoring points is finished, opening the side liquid through ports of all two-position three-way electromagnetic valves, recovering liquid in the inner cavity of the capsule pressure sensor to the liquid injection device, and moving the capsule pressure sensor out of the drilled hole along with the steel wire rope to finish recovery.
The invention has the following beneficial effects:
1. according to the monitoring device, the capsule pressure sensors are connected in series, and the hydraulic pressure sensor and the steel wire rope of each capsule pressure sensor are respectively connected to one channel of the multi-channel pressure monitor and the multi-channel displacement monitor, so that each capsule pressure sensor can work independently, and a set of monitoring device can be used for carrying out directional stress distribution and multi-point real-time synchronous monitoring on surrounding rock deformation of a single axis of the coal rock mass.
2. According to the invention, a plurality of capsule pressure sensors can be used in series through the hydraulic hose and the cable according to monitoring requirements, the number of drilled holes is reduced, multi-point monitoring can be realized through one drilled hole, larger disturbance of the coal rock mass caused by a plurality of drilled holes is avoided, the detection efficiency is improved, the capsule pressure sensor has good active coupling with the coal rock mass, and the detection reliability is high.
3. After the monitoring device finishes monitoring, all the liquid inlets on the side of the three-way valve are opened, liquid in the capsule pressure sensor is recovered to the liquid injection device, and the capsule pressure sensor is moved out of a drilled hole along the guide rail by dragging the steel wire rope, so that the capsule pressure sensor is recovered and reused.
Drawings
FIG. 1 is a schematic view of an embodiment of a monitoring device according to the present invention.
FIG. 2 is a schematic structural diagram of a pressure sensor of a capsule at the bottom of a hole in a monitoring device according to the present invention.
FIG. 3 is a cross-sectional view of a top view of a capsule pressure sensor.
Fig. 4 is a cross-sectional view of a front view of the capsule pressure sensor.
In the figure: the system comprises a liquid injection device 1, a multichannel pressure monitor 2, a multichannel displacement monitor 3, a capsule pressure sensor 4, a hydraulic hose 5, a cable 6, a steel wire rope 7, a guide rail groove 8, a fixing bolt 9, a hydraulic hose connector 10, a capsule elastic surface 11, a shell 12, a drill hole guide rail 13, a threaded hole 14, a cable connector 15, a voltage amplifier 16, a control switch 17, a liquid pressure sensor 18, a two-position three-way electromagnetic valve 19 and a coal rock mass 20.
a represents an upper liquid through port, b represents a lower liquid through port, and c represents a side liquid through port.
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1-4, the monitoring device of the present invention comprises a plurality of capsule pressure sensors 4 connected in series, a multi-channel pressure monitor 2, a multi-channel displacement monitor 3 and a set of injection device 1; the structure of the capsule pressure sensor 4 is shown in figure 2: comprises a shell 12, wherein the left and right surfaces of the shell 12 are open, and the upper and lower surfaces of the shell 12 are capsule elastic surfaces 11, so as to form a capsule-containing elastic surface shell; four corners at the left end and the right end of the shell are provided with guide rail grooves 8, and the capsule pressure sensor 4 is clamped on a track 13 drilled by the guide rail grooves 8; a two-position three-way electromagnetic valve 19 is arranged in the shell 12, the two-position three-way electromagnetic valve 19 is controlled by a control circuit, and the control circuit is formed by electrically connecting a liquid pressure sensor 18, a voltage amplifier 16 and a control switch 17; the control circuit of each capsule pressure sensor 4 is respectively connected to one channel of the multi-channel pressure monitor 2 through a cable 6; the two-position three-way electromagnetic valve 19 is provided with an upper liquid through port, a lower liquid through port and side liquid through ports a, b and c, the upper liquid through port a and the lower liquid through port b are respectively used as a liquid outlet and a liquid inlet, the side liquid through port c is communicated with the inner cavity of the shell 12, and the liquid inlet and the liquid outlet of each capsule pressure sensor 4 are sequentially connected in series through a hydraulic hose 5 to form a passage and then are connected with a liquid injection device 1 arranged outside a drill hole; a fixing bolt 9 is arranged on one side surface of the shell 12, the steel wire rope 7 is tied on the fixing bolt 9, and the steel wire rope 7 of each capsule pressure sensor 4 is respectively connected to one channel of the multi-channel displacement monitor 3.
In order to facilitate the installation of the hydraulic hose 5 and the cable 6 and improve the aesthetic property of the integral installation, a hydraulic hose connector 10 and a plurality of cable connectors 15 are arranged on the front end surface and the rear end surface of the capsule pressure sensor 4, and the hydraulic hose 5 of each capsule pressure sensor 4 is connected through the hydraulic hose connector 10; the cables 6 of each control circuit are connected to one channel of the multi-channel pressure monitor 2 through the inner cavity of all the capsule pressure sensors 4 at the rear part of the cable interface 15.
The method for monitoring the directional stress distribution and deformation of the coal rock mass by using the monitoring device comprises the following steps:
the first step is as follows: according to the monitoring scheme, determining a monitoring area, a drilling position, a drilling depth, a monitoring position and monitoring points, drilling to a preset depth, then installing a guide rail 13 in the drilling hole, and installing the guide rail 13 section by section through a threaded hole 14 when installing the guide rail 13;
the second step is that: sequentially connecting the capsule pressure sensors 4, and when the capsule pressure sensors are connected in series, requiring the length of the hydraulic hose 5 to be larger than the distance between preset monitoring points; numbering the capsule pressure sensors 4 from front to back in sequence according to the drilling direction as the front;
the third step: the capsule pressure sensors 4 connected in series are pushed into the drill hole to the deepest part along the guide rail 13, the position of each capsule pressure sensor 4 in the drill hole is judged according to the length of the exposed steel wire rope 7 of each capsule pressure sensor 4, and the capsule pressure sensors 4 are adjusted by drawing the steel wire rope 7, so that each monitoring point is provided with the capsule pressure sensors 4; then connecting a steel wire rope 7 of each capsule pressure sensor 4 with the multi-channel displacement monitor 3 outside the hole, and connecting a control circuit of each capsule pressure sensor 4 with the multi-channel pressure monitor 2 outside the hole; the hydraulic hose 5 is connected with the liquid injection device 1 outside the hole;
the fourth step: opening all the side liquid through ports c of the two-position three-way electromagnetic valve 19, injecting liquid into the hydraulic hose 5 through the liquid injection device 1, enabling the liquid to flow to the inner cavities of the capsule pressure sensors 4 through the opened side liquid through ports c of the two-position three-way electromagnetic valve 19, closing all the side liquid through ports c of the two-position three-way electromagnetic valve 19 when the inner cavities of the capsule pressure sensors 4 are filled with the liquid and the hydraulic pressure is stable, and enabling the hydraulic pressure to be the set pressure;
the fifth step: when the surrounding rock deforms, the capsule-shaped elastic surface of the capsule pressure sensor 4 is extruded, the liquid pressure sensor 18 in the capsule pressure sensor 4 senses the stress of the coal rock mass, and the pressure sensed by the liquid pressure sensor 18 in each capsule is acquired in real time by the multi-channel pressure monitor 2; when the liquid pressure in the inner cavity of the capsule pressure sensor 4 with a certain number reaches the upper limit value of the pressure which can be borne by the shell 12 of the capsule pressure sensor 4, opening the side liquid through port c of the two-position three-way electromagnetic valve 19 in the capsule pressure sensor 4, wherein the upper limit value is the current monitoring value, and the stress change value of the coal rock mass 20 monitored at the current time is subtracted from the set pressure value;
when the liquid flows back to the grouting device 1 and the hydraulic pressure is restored to the set pressure, the side liquid through port c of the capsule pressure sensor 4 is closed again, the coal rock body stress is continuously monitored, and the rest is done in the same way until the monitored coal rock body stress is not changed any more; summing the stress change values of the coal-rock mass which are monitored for many times, namely obtaining the total change value of the stress of the coal-rock mass of the monitoring point corresponding to the capsule pressure sensor 4;
the purpose of the multiple monitoring is to prevent the capsule surface of the capsule pressure sensor 4 from being damaged due to excessive hydraulic pressure.
The fifth step: and after monitoring of all monitoring points is finished, opening the liquid through ports c on the side of the two-position three-way electromagnetic valve 19, recovering liquid in the inner cavity of the capsule pressure sensor 4 to the liquid injection device 1, and moving the capsule pressure sensor 4 out of the drilled hole along with the steel wire rope 7 to finish recovery.
Claims (4)
1. A single-hole coal rock mass directional stress distribution and deformation integrated monitoring device is characterized by comprising a plurality of capsule pressure sensors connected in series, a multi-channel pressure monitor, a multi-channel displacement monitor and a set of liquid injection device; the capsule pressure sensor structure is: comprises a shell, the upper surface and the lower surface of the shell are capsule-shaped elastic surfaces, thereby forming a capsule-shaped shell; guide rail grooves are arranged at four corners of the left end and the right end of the shell, and the capsule sensor is clamped on the drilling track through the guide rail grooves; a two-position three-way electromagnetic valve is arranged in the shell and is controlled by a control circuit, and the control circuit is formed by electrically connecting a liquid pressure sensor, a voltage amplifier and a control switch; the control circuit of each capsule pressure sensor is respectively connected to one channel of the multi-channel pressure monitor through a cable; the two-position three-way electromagnetic valve is provided with an upper liquid through port, a lower liquid through port and a side liquid through port, the upper liquid through port and the lower liquid through port are respectively used as a liquid outlet and a liquid inlet, the side liquid through port is communicated with the inner cavity of the shell, and the liquid inlet and the liquid outlet of each capsule pressure sensor are sequentially connected in series through hydraulic hoses to form a passage and then connected with a liquid injection device arranged outside the drill hole; a steel wire rope fixing bolt is fixed on one side surface of the shell, and a steel wire rope of each capsule pressure sensor is respectively connected to one channel of the multi-channel displacement monitor; the multichannel pressure monitor transmits data to a remote monitoring center through a monitoring substation; the multi-channel displacement monitor consists of a plurality of stay wire type displacement sensors and transmits data to a remote monitoring center through a monitoring substation; the liquid injection device needs to keep stable hydraulic pressure in the working process.
2. The device for monitoring directional stress distribution and deformation of a single-hole coal and rock mass according to claim 1, wherein the length of the hydraulic hose and the cable is greater than the installation length.
3. The device for monitoring directional stress distribution and deformation of the single-hole coal-rock mass as claimed in claim 1, wherein a hydraulic hose connector (10) and a plurality of cable connectors (15) are arranged on the front and rear end faces of the capsule pressure sensor (4), and the hydraulic hoses (5) of the capsule pressure sensors (4) are connected through the hydraulic hose connectors (10); the cable (6) of each control circuit is connected to one channel of the multi-channel pressure monitor (2) through the inner cavity of all the capsule pressure sensors (4) at the rear part of the cable interface (15).
4. A method for simultaneously monitoring the directional stress distribution and deformation of a coal rock body by using the monitoring device of any one of claims 1 to 3,
the first step is as follows: determining a monitoring area, a drilling position, a drilling depth, a monitoring position, a monitoring stress direction and a monitoring point number according to a monitoring scheme, drilling to a preset depth, and then installing a guide rail in the drilling hole;
the second step is that: sequentially connecting all the capsule pressure sensors in series, wherein when the capsule pressure sensors are connected in series, the length of a hydraulic hose is required to be larger than the distance between preset monitoring points; numbering the capsule pressure sensors from front to back in sequence according to the drilling direction as the front;
the third step: the capsule pressure sensors connected in series are pushed into the drill hole to the deepest position along the guide rail, the positions of the capsule pressure sensors in the drill hole are judged according to the length of the exposed steel wire rope of each capsule pressure sensor, and the capsule pressure sensors are adjusted through drawing the steel wire rope, so that each monitoring point is provided with the capsule pressure sensors; then connecting the steel wire rope of each capsule pressure sensor with a multi-channel displacement monitor outside the hole, and connecting a control circuit of each capsule pressure sensor with the multi-channel pressure monitor outside the hole; the hydraulic hose is connected with a liquid injection device outside the hole;
the fourth step: opening side liquid through ports of all two-position three-way electromagnetic valves, injecting liquid into a hydraulic hose through a liquid injection device, enabling the liquid to flow to inner cavities of all capsule pressure sensors through the opened side liquid through ports of the two-position three-way electromagnetic valves, closing the side liquid through ports of all the two-position three-way electromagnetic valves when the inner cavities of all the capsule pressure sensors are filled with the liquid and the hydraulic pressure is stable, and enabling the hydraulic pressure to be a set pressure value;
the fifth step: when surrounding rock deforms, a capsule-shaped elastic surface of the capsule pressure sensor is extruded, a liquid pressure sensor in the capsule pressure sensor senses the stress of the coal rock mass, and the pressure sensed by each liquid pressure sensor is acquired by a multi-channel pressure monitor in real time; when the liquid pressure in the inner cavity of the capsule pressure sensor with a certain number reaches the upper limit value of the pressure which can be borne by the shell of the capsule pressure sensor, opening a side liquid through port of a two-position three-way electromagnetic valve in the capsule pressure sensor, wherein the upper limit value at the moment is the monitoring value at the time, and subtracting the set pressure value from the monitoring value to obtain the coal rock stress change value monitored at the time; when the liquid flows back to the grouting device and the hydraulic pressure is restored to the set pressure value, closing the side liquid inlet of the capsule pressure sensor again, continuing to monitor the stress of the coal rock mass, and repeating the steps until the stress of the coal rock mass is monitored and is not changed any more; summing the stress change values of the coal rock mass which are monitored for many times, namely obtaining the total change value of the stress of the coal rock mass of the monitoring point corresponding to the capsule pressure sensor;
and a sixth step: and after monitoring of all monitoring points is finished, opening all the side liquid through ports of the two-position three-way electromagnetic valve, recovering liquid in the inner cavity of the capsule pressure sensor to the liquid injection device, and moving the capsule pressure sensor out of the drilled hole along with the steel wire rope to complete recovery.
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| CN104132761A (en) * | 2014-08-04 | 2014-11-05 | 中国矿业大学 | Multipoint coal and rock mass stress real-time monitoring device and method |
| CN206740281U (en) * | 2017-05-15 | 2017-12-12 | 山东科技大学 | Single hole coal and rock directional stress is distributed with deforming integral monitoring device |
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