CN111691921A - Rock burst online monitoring system and method based on support resistance monitoring - Google Patents
Rock burst online monitoring system and method based on support resistance monitoring Download PDFInfo
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- CN111691921A CN111691921A CN202010480547.1A CN202010480547A CN111691921A CN 111691921 A CN111691921 A CN 111691921A CN 202010480547 A CN202010480547 A CN 202010480547A CN 111691921 A CN111691921 A CN 111691921A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 65
- 239000011435 rock Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 21
- 238000012806 monitoring device Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims description 8
- 230000001960 triggered effect Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 17
- 238000005553 drilling Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/12—Control, e.g. using remote control
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Abstract
The invention provides an online rock burst monitoring system and a detection method based on support resistance monitoring, which comprises a ground processing system positioned on the ground, an online monitoring device for the resistance of an underground advanced hydraulic support and a support positioning system, wherein the online monitoring device for the resistance of the underground advanced hydraulic support and the support positioning system are respectively connected with an underground optical fiber ring network and an underground explosion-proof intrinsic safety power supply; the on-line monitoring device for the resistance of the advanced hydraulic support comprises the advanced hydraulic support, a support pressure sensor arranged on the advanced hydraulic support, a data collector arranged on the roadway side part of a working face and an underground substation, wherein the support positioning system comprises an identification card and a card reading substation. The invention expands the types of rock burst monitoring and early warning methods, and realizes the on-line monitoring of the resistance of the roadway advanced hydraulic support and the automatic positioning of the support so as to find out a high stress area and the variation trend thereof and realize the real-time monitoring, early warning and forecasting of the rock burst dangerous area and the dangerous degree.
Description
Technical Field
The invention relates to the technical field of mining engineering, in particular to an online rock burst monitoring system and method based on support resistance monitoring.
Background
In recent years, coal mine rock burst disasters become more serious in China, extensive research is carried out at home and abroad aiming at rock burst monitoring and early warning, and a plurality of beneficial achievements are obtained in the aspects of rock burst monitoring and early warning methods and equipment. In the aspect of the monitoring and early warning method and equipment for the rock burst danger, the mainstream stress field monitoring comprises a drilling cutting method, an online stress method, a mine pressure observation method, an elastic wave and vibration wave CT method and the like, and the mainstream vibration field monitoring comprises a microseismic method, acoustic emission, electromagnetic radiation and the like.
Practice proves that due to the complexity of rock burst, accurate early warning of impact areas is difficult to achieve by the single method, and multi-parameter comprehensive monitoring and early warning considering multiple methods are more scientific. Among them, the drilling cutting method, the on-line stress method and the microseismic method are most widely used. The online stress method is a rock burst risk determination method based on an equivalent drilling cutting quantity principle and multi-factor coupling. The basic principle is the positive correlation between the rock stratum movement, the supporting pressure, the drilling cutting quantity and the stress of the surrounding rock of the drill hole. The change rule of the mining stress field in front of the working face is monitored in real time on line, the high stress area and the change trend thereof are found, and real-time monitoring, early warning and forecasting of the dangerous area and the dangerous degree of the rock burst are realized. The method specifically comprises the steps of burying a borehole stressometer in a coal seam, and realizing online monitoring by matching with systems for data acquisition, transmission, processing and the like, wherein the monitored objects are coal rock bodies on two sides of a roadway.
In the coal mine rock burst prevention and control process, advance hydraulic supports are required to be arranged in roadways on two sides of a coal face, it is found in the actual monitoring and early warning work that the support resistance of the advance hydraulic supports is completely and positively correlated with the monitoring value of the borehole stressometers in coal rock bodies on two sides of the roadway, when the thickness of a coal seam is large and the uniaxial compressive strength of the coal body is greatly different, the part with the lower uniaxial compressive strength is firstly formed when the stress of the coal body is remarkably increased and deformed, and at the moment, if the borehole stressometers are buried in the coal body with the higher strength, the monitoring effect is not sensitive enough relative to the support resistance of the advance hydraulic supports. Secondly, the supporting resistance of the hydraulic support ahead directly reflects the stress characteristics of the roadway top and bottom plate coal rock mass, and the monitoring of the supporting resistance of the hydraulic support ahead is more direct for the common instant bottom heave, top plate sinking and the like of rock burst. Finally, as the advance hydraulic support needs to move continuously along with the extraction of the working face, for the non-self-moving advance hydraulic support, the actual installation position needs to be accurately recorded when the advance hydraulic support moves frequently, otherwise, the judgment of the dangerous area has deviation.
Disclosure of Invention
The invention provides an online rock burst monitoring system and method based on support resistance monitoring in order to make up for the defects of the prior art.
The invention is realized by the following technical scheme: an online rock burst monitoring system based on support resistance monitoring comprises a ground processing system located on the ground, an online resistance monitoring device of an underground advanced hydraulic support and a support positioning system, wherein the online resistance monitoring device of the underground advanced hydraulic support and the support positioning system are respectively connected with an underground optical fiber ring network and an underground explosion-proof intrinsic safety power supply; the on-line monitoring device for the resistance of the advanced hydraulic support comprises the advanced hydraulic support, a support pressure sensor arranged on the advanced hydraulic support, a data collector arranged on the roadway side part of a working face and an underground substation, wherein the support positioning system comprises an identification card and a card reading substation.
Furthermore, the support pressure sensor is installed on a stand column pressure interface of the advanced hydraulic support, and the data acquisition unit and the underground substation and the underground optical fiber ring network are connected through a signal cable I.
Furthermore, the underground substation is connected with an underground explosion-proof intrinsic safety power supply through a power supply cable II.
Furthermore, the data acquisition unit and the card reading substation are respectively connected with an underground explosion-proof intrinsic safety power supply through a power supply cable I, and the card reading substation is connected with an underground optical fiber ring network through a signal cable II.
Furthermore, a support pressure sensor and an identification card are installed on each advance hydraulic support.
Further, the data collector and the card reading substation are arranged at the upper part of the roadway of the working face at intervals of 100-200 m.
The invention also provides a monitoring method of the rock burst online monitoring system based on the support resistance monitoring, which comprises the following steps:
step one, installing a hydraulic advance support in a working face roadway, and converting a pressure signal measured in real time into an electric signal by a support pressure sensor and transmitting the electric signal to a data acquisition unit;
step two, the data acquisition unit transmits the electric signal of the step one to the underground substation through a signal cable I, and the signal is transmitted to an underground optical fiber ring network through the signal cable I after being processed by the underground substation;
thirdly, the identification card and the card reading substation adopt ultra-wideband UWB radio frequency signal communication based on extremely narrow pulses, and the card reading substation receives signals of the identification card in real time and transmits the signals to the underground optical fiber ring network through a signal cable II;
and step four, the optical fiber ring network transmits real-time monitoring data of the on-line monitoring device for the resistance of the hydraulic support and the support positioning system to a ground processing system, and the real-time supporting resistance and the specific position of each hydraulic support are monitored in real time.
Further, in the first step, the bracket pressure sensor detects pressure change once according to sampling time, when the difference value of the digital pressure gauge detected twice is larger than or equal to a trigger threshold value, the digital pressure gauge is triggered to record and store effective data once, when the difference value is smaller than or equal to the trigger threshold value, the digital pressure gauge does not record the effective data once, the effective data does not exceed the threshold value after 30 seconds, and the effective data is triggered and recorded once after 30 seconds.
Compared with the prior art, the invention has the advantages that:
1. for medium and thick coal seams, when the uniaxial compressive strength of coal bodies at different layers is greatly different, the monitoring of the supporting resistance of the advance hydraulic support is more sensitive and more direct to the stress concentration degree of surrounding rocks of the roadway relative to the monitoring of the stress of the coal bodies;
2. the bracket pressure sensor detects the pressure change once according to the set sampling time, and when the difference value of the digital pressure gauge detected twice is larger than or equal to the trigger threshold value, the bracket pressure sensor is triggered to record and store the effective data once. The working condition capture of the descending frame, the moving frame and the ascending frame of the advanced hydraulic support, the resistance change capture of the sudden resistance increase, the micro resistance increase and the constant resistance and the capture of the safety valve opening overflow can be more accurate and visual than the traditional timing acquisition;
3. by installing the support positioning system, the system automatically records the specific position of the forepoling support under the condition of frequent movement, the field labor intensity is reduced, and the monitoring precision is improved;
4. the invention expands the types of rock burst monitoring and early warning methods, and realizes the on-line monitoring of the resistance of the roadway advanced hydraulic support and the automatic positioning of the support so as to find out a high stress area and the variation trend thereof and realize the real-time monitoring, early warning and forecasting of the rock burst dangerous area and the dangerous degree.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the installation of the present invention;
fig. 3 is a schematic structural diagram of a hydraulic advance bracket according to an embodiment of the present invention.
In the figure, 1, an advanced hydraulic support resistance online monitoring device, 2, a support positioning system, 3, a support pressure sensor, 4, a data acquisition unit, 5, an underground substation, 6, an identification card, 7, a card reading substation, 8, an underground explosion-proof intrinsic safety power supply, 9, an underground optical fiber ring network, 10, signal cables I, 11, signal cables II, 12, power supply cables I, 13, power supply cables II, 14, an advanced hydraulic support, 15, a working face roadway, 16 and a ground processing system.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1-3, an online rock burst monitoring system based on support resistance monitoring comprises a ground processing system 16 located on the ground, an online monitor 1 for the resistance of a downhole advanced hydraulic support, and a support positioning system 2. The on-line monitoring device 1 for the resistance of the advanced hydraulic support and the support positioning system 2 are respectively connected with an underground optical fiber ring network 9 and an underground explosion-proof intrinsic safety power supply 8; the on-line monitoring device 1 for the resistance of the advanced hydraulic support comprises an advanced hydraulic support 14, support pressure sensors 3 arranged on a stand column pressure interface of the advanced hydraulic support 14, a data collector 4 arranged at the upper part of a working face roadway 15 and an underground substation 5, wherein the advanced hydraulic support 14 is arranged in the working face roadways 15 on two sides of a coal mining working face, the advanced hydraulic support 14 selects corresponding specifications and types according to the actual conditions of a coal mine, the support pressure sensors 3 can convert pressure signals into electric signals, and the data collector 4 can wirelessly receive the electric signals of the support pressure sensors 3. The data acquisition unit 4 is connected with the underground substation 5, and the underground substation 5 is connected with the underground optical fiber ring network 9 through signal cables I10; the underground substation 5 is connected with an underground explosion-proof intrinsic safety power supply 8 through a power supply cable II 13.
The support positioning system 2 comprises an identification card 6 and a card reading substation 7. The data acquisition unit 4 and the card reading substation 7 are both connected with an underground explosion-proof intrinsic safety power supply 8 through a power supply cable I12, and the card reading substation 7 is connected with an underground optical fiber ring network 9 through a signal cable II 11. And each advance hydraulic support 14 is provided with a support pressure sensor 3 and an identification card 6. The data acquisition unit 4 and the card reading substation 7 are arranged at the upper part of the working face roadway 15 at intervals of 100-200 m.
The invention also provides a monitoring method of the rock burst online monitoring system based on the support resistance monitoring, which comprises the following steps:
step one, installing a hydraulic advance support 14 in a working face roadway 15, and converting a pressure signal measured in real time into an electric signal by a support pressure sensor 3 and transmitting the electric signal to a data acquisition unit 4;
step two, the data acquisition unit 4 transmits the electric signal of the step one to the underground substation 5 through a signal cable I10, and the signal is processed by the underground substation 5 and then transmitted to an underground optical fiber ring network 9 through the signal cable I10;
thirdly, the identification card 6 and the card reading substation 7 adopt ultra-wideband UWB radio frequency signal communication based on extremely narrow pulses, and the card reading substation 7 receives signals of the identification card 6 in real time and transmits the signals to the underground optical fiber ring network 9 through a signal cable II 11;
and step four, the optical fiber ring network 9 transmits the real-time monitoring data of the on-line monitoring device 1 for the resistance of the hydraulic support and the support positioning system 2 to the ground processing system 16 for conversion and analysis, monitors the real-time supporting resistance and the specific position of each hydraulic support 14 in real time, and automatically gives an alarm when the supporting resistance of the hydraulic support 14 exceeds a set threshold value.
In the stoping process of the coal face, under the influence of the advanced supporting pressure, the lateral supporting pressure and the like of the rear goaf, the stress concentration degree of surrounding rock of the roadway in the working face roadway 15 within a certain advanced range is increased continuously, the supporting resistance of the advanced hydraulic supports 14 arranged on two sides in the working face roadway 15 is increased along with the increase of the stress concentration degree, and at the moment, the support pressure sensor 3 can convert real-time pressure signals into electric signals. Therefore, in step 1, the stent pressure sensor 3 detects a pressure change at a set sampling time, which is on the order of seconds.
When the difference value of the digital pressure gauge detected in two adjacent times is larger than or equal to the trigger threshold, the digital pressure gauge is triggered to record and store effective data for one time, when the difference value is smaller than or equal to the trigger threshold, the digital pressure gauge does not record the effective data for more than 30 seconds, the effective data is triggered and recorded for one time for 30 seconds, and other time can be set according to actual requirements at time intervals. The program adopts a data intelligent filtering algorithm, so that the pressure value change capture is ensured, and the data redundancy is effectively avoided. The data acquisition unit 4 can wirelessly receive the electric signal of the support pressure sensor 3 and transmit the electric signal to the underground substation 5 through the signal cable 10, and the signal is processed by the underground substation 5 and then transmitted to the ground underground optical fiber looped network 9 through the signal cable I10.
In the fourth step, the flying time TOF of a UWB signal reciprocating between the plurality of identification cards 6 and the card reading substations 7 is measured, the position of the marking card body is accurately calculated according to the set coordinate position of the card reading substations, and therefore distance/position measurement with centimeter precision is achieved.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for the purpose of describing the present invention but do not require that the present invention be necessarily constructed or operated in a specific orientation, and should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be interpreted broadly, and may be connected or disconnected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a rock burst on-line monitoring system based on support resistance monitoring which characterized in that: the device comprises a ground processing system (16) positioned on the ground, an underground advanced hydraulic support resistance online monitoring device (1) and a support positioning system (2), wherein the advanced hydraulic support resistance online monitoring device (1) and the support positioning system (2) are respectively connected with an underground optical fiber ring network (9) and an underground explosion-proof intrinsic safety power supply (8); the on-line monitoring device for the resistance of the advanced hydraulic support (1) comprises the advanced hydraulic support (14), a support pressure sensor (3) installed on the advanced hydraulic support (14), a data collector (4) installed on the side part of a working face roadway (15) and an underground substation (5), wherein the support positioning system (2) comprises an identification card (6) and a card reading substation (7).
2. The online rock burst monitoring system based on stent resistance monitoring as claimed in claim 1, wherein: the support pressure sensor (3) is installed on a vertical column pressure interface of the advanced hydraulic support (14), and the data collector (4) and the underground substation (5) as well as the underground substation (5) and the underground optical fiber ring network (9) are connected through a signal cable I (10).
3. The online rock burst monitoring system based on stent resistance monitoring as claimed in claim 1, wherein: the underground substation (5) is connected with an underground explosion-proof intrinsic safety power supply (8) through a power supply cable II (13).
4. The online rock burst monitoring system based on stent resistance monitoring as claimed in claim 1, wherein: the data acquisition unit (4) and the card reading substation (7) are connected with the underground explosion-proof intrinsic safety power supply (8) through a power supply cable I (12), and the card reading substation (7) is connected with the underground optical fiber ring network (9) through a signal cable II (11).
5. The online rock burst monitoring system based on stent resistance monitoring as claimed in claim 1, wherein: and each advance hydraulic support (14) is provided with a support pressure sensor (3) and an identification card (6).
6. The online rock burst monitoring system based on stent resistance monitoring as claimed in claim 1, wherein: the data acquisition unit (4) and the card reading substation (7) are arranged at the upper part of the working face roadway (15) at intervals of 100-200 m.
7. The monitoring method of the online rock burst monitoring system based on the bracket resistance monitoring as claimed in claim 1, wherein the monitoring method comprises the following steps: the method comprises the following steps:
step one, installing an advanced hydraulic support (14) in a working face roadway (15), and converting a pressure signal measured in real time into an electric signal by a support pressure sensor (3) and transmitting the electric signal to a data acquisition unit (4);
step two, the data acquisition unit (4) transmits the electric signal of the step one to the underground substation (5) through a signal cable I (10), and the signal is transmitted to an underground optical fiber ring network (9) through the signal cable I (10) after being processed by the underground substation (5);
thirdly, the identification card (6) and the card reading substation (7) adopt ultra-wideband UWB radio frequency signal communication based on extremely narrow pulses, and the card reading substation (7) receives the signal of the identification card (6) in real time and transmits the signal to the underground optical fiber ring network (9) through a signal cable II (11);
and step four, the optical fiber ring network (9) transmits real-time monitoring data of the on-line monitoring device (1) of the resistance of the hydraulic support and the support positioning system (2) to the ground processing system (16), and the real-time monitoring data are converted and analyzed to monitor the real-time supporting resistance and the specific position of each hydraulic support (14).
8. The monitoring method of the online rock burst monitoring system based on the bracket resistance monitoring as claimed in claim 1, wherein the monitoring method comprises the following steps: in the first step, the bracket pressure sensor (3) detects one-time pressure change according to sampling time, when the difference value of the digital pressure gauge detected twice is larger than or equal to a trigger threshold value, the digital pressure gauge is triggered to record and store one-time effective data, when the difference value is smaller than or equal to the trigger threshold value, the digital pressure gauge does not record at the moment, the threshold value is not exceeded after 30 seconds, and the effective data is triggered and recorded once after 30 seconds.
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| CN202010480547.1A CN111691921A (en) | 2020-05-30 | 2020-05-30 | Rock burst online monitoring system and method based on support resistance monitoring |
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| CN112483098A (en) * | 2020-12-18 | 2021-03-12 | 山东科技大学 | Method for preventing and treating rock burst of advanced broken roof of stope |
| CN112483141A (en) * | 2020-12-18 | 2021-03-12 | 山东科技大学 | Method for predicting impact risk by support resistance |
| CN112483186A (en) * | 2020-12-18 | 2021-03-12 | 山东科技大学 | Method for judging impact risk of advanced broken roof coal seam by window intervention method |
| CN112483179A (en) * | 2020-12-18 | 2021-03-12 | 山东科技大学 | Method for judging impact risk of roof stope of separation layer by window intervention method |
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