CN112302722B - Coal mine roadway multidirectional stress and deformation wireless monitoring and early warning method and system - Google Patents
Coal mine roadway multidirectional stress and deformation wireless monitoring and early warning method and system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 100
- 239000003245 coal Substances 0.000 title claims abstract description 39
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- 238000005553 drilling Methods 0.000 claims abstract description 27
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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
- 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
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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
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Abstract
The invention relates to a multi-azimuth stress and deformation wireless monitoring and early warning system for a coal mine tunnel, which comprises a monitoring center, a plurality of groups of wireless sensor nodes distributed on the wall surface of the tunnel and embedded in surrounding rock drilling holes, a plurality of monitoring substations arranged on the wall surface of the tunnel, a plurality of singlechips, and wireless sensor nodes, wherein each wireless sensor node comprises a separation layer sensor, a proximity sensor, a laser ranging sensor and a cube three-dimensional stress monitoring sensor, the monitoring substations are connected with the singlechips in a wireless data way and comprise a central processing unit, a wireless communication module, a display module and an alarm connected with the central processing unit, and meanwhile, acquired information is transmitted to the ground monitoring center through an industrial Ethernet communication system.
Description
Technical Field
The invention belongs to the field of underground coal mine safety equipment, and particularly relates to a wireless monitoring and early warning method and system for multi-azimuth stress and deformation of a coal mine tunnel, which are generally applicable to real-time dynamic monitoring of surrounding rock stress and deformation of the underground tunnel and are used for guiding roof safety management and coal rock dynamic disaster prevention and control in a mine excavation process.
Background
In various coal mine accidents, the roof accident is still in front, and roof disaster accidents refer to accidents such as casualties, equipment damage, production termination and the like caused by unexpected falling of the roof in the underground coal mine production process. The roof accident has high accident frequency and large accident total quantity, and is an important point for controlling the total quantity of coal mine accidents, compared with the accidents such as coal mine gas explosion, water permeability and the like, although the number of dead people is small each time. Because roof disasters are influenced by various factors such as occurrence conditions of coal seams, geological structures, mining activities, mining technologies and the like, no measures are taken at present to completely prevent roof accidents, real-time dynamic monitoring of the safety of the roof of a working face is particularly important in the coal mining process, and the safety of coal mine personnel and property can be greatly ensured. With the increase of production capacity, the increase of mining intensity, the shift to deep mining, the problems of roof safety and the like are more and more remarkable, and the mining pressure change rules of primary and periodic compaction of an overburden layer on a stope working face are not clear.
Along with the continuous expansion of the goaf and the continuous adjustment of ground stress near the coal seam, cracks in the coal seam and the stratum near the coal seam are continuously developed and expanded, water-resisting layers above and below the coal seam can be conducted to an aquifer due to expansion of the cracks, roof, bottom drum and natural collapse of the top and bottom plates of the coal seam can occur, and part of gas in an adsorption state in the coal seam can be released and filled in the cracks, so that the content of free gas is increased, and the complex conditions of the hydrologic and geological conditions changing along with time are faced to mines with hidden different geological disaster hidden dangers. At present, indexes capable of effectively reflecting the safety of the top plate of the working face include top plate pressure, end face height, approaching amount of the top plate and the bottom plate, and the like. Before mining, coal and rock bodies are subjected to the action of gravity generally, stress in all aspects is balanced, pressure phenomenon is not shown, a certain space is formed along with the progress of mining work during the production of the mine, and roof rocks are suspended, so that the original balanced stable state of stratum is destroyed, the rocks start to move and deform, and the force generated by the rock movement is called mine pressure. Under the action of mine pressure, the phenomena of sinking, crushing, bracket crushing, caving, coal deformation and the like are caused, and the phenomenon is called mine pressure appearance, and the mine pressure appearance is the result of the mine pressure action. The approaching amount of the top plate and the bottom plate is reflected by the influence of mining on the stoping space and the deformation and movement of surrounding rock under the supporting action of the hydraulic support, so that the stability degree of the top plate of the fully-mechanized mining face, the support supporting effect and the adaptability can be evaluated, data can be provided for support selection and design (the structure, the height and the like of the support), and suggestions can be provided for improving the management of the top plate. In addition, the method can be used for judging the step distance and the intensity of the initial pressing and the periodical pressing of the old roof, so that the movement rule of the surrounding rock of the fully mechanized mining face is mastered, and the approaching amount of the roof and the base plate per meter of mining height is specified to be not more than 100mm in order to ensure the safety of the face. At present, no index which is better than the near-distance measurement of the top and bottom plates and the supporting effect of the fully mechanized mining face is found in China, so that the near-distance measurement of the top and bottom plates is an observation item which cannot be ignored. The end face distance refers to the distance from the hydraulic support front cantilever to the coal wall, the distance is regulated to be not more than 340mm, the end face height refers to the falling height of the distance, and the regulated distance is not more than 300mm. When the caving height of the direct top end surface is smaller than the critical caving height, a stable caving arch can be formed, and when the caving height is larger than the critical height, the direct top rock mass is difficult to form the stable caving arch, so that serious caving accidents occur on the fully mechanized mining surface. The leakage and the overflow of the direct top of the fragmentation structure are effectively controlled, and the top plate overflow height of the end face must be controlled within a critical height. However, at present, the 3 effective indexes are all measured manually through mutually independent instruments, on one hand, the accuracy of data cannot be guaranteed, on the other hand, all indexes cannot be dynamically monitored in real time, and in addition, the uncertainty and the contingency of the roof accident of the coal mine are added, so that hidden dangers are buried for the roof accident of the working face, and the property of the coal mine and the life safety of workers are seriously threatened.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the wireless monitoring and early warning method for the multi-azimuth stress and deformation of the coal mine tunnel, which has the advantages of comprehensive measurement parameters, simple and convenient method, high measurement precision, high sensitivity and good use effect.
The invention provides a monitoring and early warning system suitable for the coal mine roadway multi-azimuth stress and deformation wireless monitoring and early warning method.
The technical scheme of the invention is as follows: a wireless monitoring and early warning method for multi-azimuth stress and deformation of a coal mine roadway comprises the following steps:
a. The method comprises the steps of dynamically monitoring the stress of surrounding rock of a roadway, respectively arranging a plurality of groups of drilling holes on two side walls of the roadway with obvious coal-rock dynamic phenomena on a working face or a working face according to the direction of a bedding layer and a reverse layer, wherein the drilling depth is 10-15 m, simultaneously, respectively arranging a plurality of groups of drilling holes on a top plate and a bottom plate at an included angle of 20-30 degrees in the bedding direction, wherein the drilling depth of the bottom plate is 10-15 m, the drilling depth of the top plate is 15-20 m, monitoring the stress change rule of the surrounding rock of the roadway through the drilling holes on four wall faces, and the interval of each group of drilling holes is 100-150 m; the method comprises the steps that a cube three-dimensional stress monitoring sensor is arranged in a drill hole through a hollow elastic rod, a signal transmission cable of the monitoring sensor leads out the position of a roadway wall through the hollow elastic rod, the signal transmission cable is connected with a single chip microcomputer through an A/D converter, the single chip microcomputer carries out three-dimensional coal rock mass dynamic stress monitoring through feedback of the cube three-dimensional stress monitoring sensor, and the processed signal is transmitted to a monitoring substation through a single chip microcomputer wireless communication module; grooves are formed in three orthogonal surfaces of the cube three-dimensional stress monitoring sensor, three resistance type strain sensing units are arranged in the grooves according to an equiangular strain combination building configuration model, and the surfaces of the three resistance type strain sensing units are covered with a protective coating;
b. dynamic monitoring of roadway deformation, arranging separation layer sensors on the roadway roof, the roadway floor and roadway walls on two sides respectively, and placing a probe into the roadway wall surrounding rock; the method comprises the steps that the transmitting modules and the receiving modules of the infrared ranging sensors are symmetrically arranged on the surfaces of a roadway top, a bottom plate and the roadway wall of the left side wall and the right side wall respectively, the two modules are required to be opposite, the deviation angle is +/-15 degrees, the distance is calculated through receiving and transmitting signals, and the omnibearing monitoring of the relative distance between surrounding rocks of the roadway is realized; the surface of the roadway roof, the roadway floor and the roadway wall at two sides are respectively provided with a movement amount sensor; the separation layer sensor, the infrared ranging sensor and the movement sensor are connected with the A/D converter through signals and are transmitted into the singlechip, and the singlechip processes monitoring information and transmits the monitoring information to the monitoring substation through the wireless transceiver module;
c. Arranging a monitoring substation every 150-200 m in a roadway of a mining working face, dynamically acquiring and displaying stress and deformation parameters in real time in a wireless communication mode, connecting a nearby industrial Ethernet switch at an inlet of the mining working face, and transmitting detection information to a ground monitoring center through an underground industrial Ethernet communication system; the monitoring substation sets a related monitoring parameter threshold value, and triggers an alarm to alarm in situ after overrun;
d. the ground monitoring center is composed of an industrial personal computer and a display, wherein the industrial personal computer is used for importing monitoring data into a database, statistically analyzing monitoring parameters, displaying stress and deformation states in a window through a dynamic distribution curve, constructing a roadway surrounding rock damage risk judging model by setting stress and deformation weights, and integrating an abnormal early warning value F to obtain a calculation formula:
wherein: lambda is the weight of a certain parameter, A, B, C, D is the value of the monitoring parameter, and A0, B0, C0 and D0 are the early warning threshold values of the monitoring parameter. Meanwhile, the monitoring and early warning software is also provided with an abnormal filtering function, and when the infrared ranging transceiver module is shielded, false alarms can be avoided through checking and correcting other parameters.
Further, after the three-dimensional stress sensor for drilling is placed, hole sealing is carried out, the hole sealing pressure of cement mortar is 1MPa, and the hole sealing time is kept for 10 minutes.
Further, in the step a, the three-dimensional coal rock mass is dynamically and dynamically monitored in stress, a configuration model is built on a single plane by using three strain gauges according to equiangular strain combinations, and the three resistive strain sensing units are respectively arranged in the single component arrangement direction:=0°，/>=60°，/> =120°; optional three directions/> Line strain/>. Then utilize strain state equation, will/>Substituting, a measurement of single plane strain is obtained.
The strain of the single component of the three resistance strain sensing units on the plane is as follows:
The maximum and minimum principal stresses in a single direction can be obtained according to the strain state equation:
Three resistance strain sensing units are combined into a group of equiangular strain combination configuration calculation models, and the maximum main strain in a single orthogonal plane can be obtained Minimum principal strain/>。
According to Hooke's law, the plane principal stress maximum value can be obtained:
In the middle of Is the maximum principal stress in plane,/>Is the minimum principal stress in plane,/>The elastic modulus of the stratum rock mass where the ground stress sensor is located.
The three-dimensional space stress of the coal rock mass can be represented by three mutually orthogonal planes, the stress of each orthogonal plane is monitored by an equiangular strain combination consisting of three resistance strain sensing units, and the maximum principal stress is removed after the calculation method. The maximum principal stress space mechanical vector synthesis of the three orthogonal planes xoy, xoz, yoz can obtain the maximum principal stress F 1、F2、F3 in the three-dimensional space, and the direction angle is theta 1、θ2、θ3; and respectively projecting the maximum principal stress of the three-dimensional space to three coordinate axes to obtain a stress value F x、Fy、Fz of the three-dimensional space.
The three-dimensional space stress value F x、Fy、Fz vector synthesized three-dimensional space maximum principal stress F max is:
the monitoring system dynamically monitors three resistance type strain sensing units on each orthogonal surface to obtain single-sided stress, and finally obtains three-dimensional space stress and the maximum principal stress value according to the calculation method.
In the method, the ground stress is a dynamic three-dimensional physical vector, comprising the magnitude and the direction, and the magnitude and the direction of the ground stress are required to be monitored simultaneously in order to realize continuous monitoring of the stress of the surrounding rock of the roadway. The stress characteristics of the three-dimensional space are expressed by three orthogonal planes in a branching way, and the maximum principal stress vector of the surface synthesizes the maximum principal stress magnitude and direction of the space. The plane strain of the measured object is multiplied by the elastic modulus to obtain the stress, and the maximum principal stress measurement in the plane can be converted into strain measurement.
The method can determine the stress concentration position of the roadway, reveal the dynamic change process and rule of the stress migration of the coal and rock, judge dangerous points of the mine dynamic phenomenon, and analyze and predict the occurrence rule of the mine dynamic phenomenon. Thereby guaranteeing the safe production of enterprises and having remarkable social benefit and wide application prospect.
The invention relates to a wireless monitoring and early warning system for multi-azimuth stress and deformation of a coal mine tunnel,
Comprises a monitoring center, a plurality of groups of wireless sensor nodes distributed on the wall surface of a roadway and embedded in surrounding rock drilling, a plurality of monitoring substations arranged on the wall surface of the roadway and a plurality of single-chip computers,
The wireless sensor node comprises a separation layer sensor, a moving-near quantity sensor, a laser ranging sensor and a cube three-dimensional stress monitoring sensor, wherein the cube three-dimensional stress monitoring sensor is arranged in drilling holes which are arranged in the direction of a bedding layer and a reverse layer and are respectively arranged at an included angle of 20-30 degrees in the direction of the bedding layer on two side walls of a roadway with obvious coal-rock dynamic phenomenon, three orthogonal surfaces of the cube three-dimensional stress monitoring sensor are provided with grooves, three resistance type strain sensing units are arranged in the grooves according to an equiangular strain combination building configuration model, and the surfaces of the three resistance type strain sensing units are covered with a protective coating; the moving-near quantity sensor, the separation layer sensor and the laser ranging sensor are arranged in the drilled holes on the roadway top, the roadway bottom plate and the roadway walls at two sides; the wireless sensor node and the monitoring substation are connected with the singlechip through an A/D converter,
The monitoring substation is connected with the singlechip in a wireless data way and comprises a central processing unit, a wireless communication module, a display module and an alarm which are connected with the central processing unit, and is used for dynamically collecting the information of the sensor nodes and displaying the information in real time, and simultaneously transmitting the collected information to a ground monitoring center through an industrial Ethernet communication system,
The ground monitoring center is connected with the monitoring substation line, is used for statistically displaying dynamic distribution curves by the industrial personal computer and the display, records and judges roadway deformation and risks in real time, and simultaneously alarms on the ground and underground due to abnormal triggering.
And the same type of sensor of the wireless sensor node is distributed in a group every 100-150 meters.
The monitoring substations are arranged one for each 100-150 meters in the roadway.
The monitoring and early warning system can monitor stress concentration positions in the roadway in real time and feed back the stress concentration positions to the ground monitoring center in time, and provides references for workers to judge dangerous points of the mine dynamic phenomenon and analyze and predict occurrence rules of the mine dynamic phenomenon. The safety production is ensured to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic diagram of a three-dimensional stress monitoring principle of surrounding rock drilling and a wireless sensor node.
Fig. 3 is a schematic diagram of a deformation monitoring wireless sensor node.
FIG. 4 is a schematic diagram of a roadway stress deformation monitoring substation.
FIG. 5 is a diagram of a roadway stress-deformation monitoring and early warning system.
Fig. 6 is a schematic diagram of the three-dimensional stress monitoring principle of surrounding rock drilling in the present invention.
FIG. 7 is an isometric strain combining modeling of three resistive strain sensing elements according to the present invention.
Detailed Description
As shown in fig. 1-7, a multi-azimuth stress and deformation wireless monitoring and early warning system for a coal mine tunnel,
Comprises a monitoring center, a plurality of groups of wireless sensor nodes distributed on the wall surface of a roadway and embedded in surrounding rock drilling holes, a plurality of monitoring substations 1 and a plurality of single chip computers 6 arranged on the wall surface of the roadway,
The wireless sensor node comprises a separation layer sensor 2 with the model number of GUD-500, a approaching amount sensor 3 with the model number of KBU101-200, a laser ranging sensor 4 with the model number of MSE-LT150 and a cube three-dimensional stress monitoring sensor 5, wherein grooves are formed in three orthogonal faces of the cube three-dimensional stress monitoring sensor 5, three resistance strain sensing units are arranged in the grooves according to an equiangular strain combination building configuration model, a protective coating is covered on the surfaces of the three-dimensional stress sensing units, the cube three-dimensional stress monitoring sensor is arranged in drilling holes which are respectively arranged on two side walls of a roadway with remarkable coal-rock dynamic phenomenon according to the bedding direction and the bedding direction of a top plate and a bottom plate, the cube three-dimensional stress monitoring sensor is arranged in the drilling holes by a hollow elastic rod, a signal transmission cable of the monitoring sensor is led out of the positions of the roadway walls by the hollow elastic rod, the multi-channel A/D converter with the model number of AD7706BRZ is connected with a single chip microcomputer 6 with P89LPC932, after the drilling holes are three-dimensional stress sensors, hole sealing cement sealing is carried out, and the pressure is kept for 1MPa for 10 minutes; the approaching amount sensor, the separation layer sensor and the laser ranging sensor are arranged in the drilled holes on the roadway top, the roadway bottom plate and the roadway walls at two sides;
Separate layer sensors are respectively arranged on the roadway roof, the roadway bottom plate and the roadway walls on two sides, and a probe is placed into the roadway wall surrounding rock; the method comprises the steps that the transmitting modules and the receiving modules of the laser ranging sensors are symmetrically arranged on the surfaces of a roadway top, a bottom plate and the roadway wall of the left side wall and the right side wall respectively, the two modules are required to be opposite, the deviation angle is +/-15 degrees, the distance is calculated through receiving and transmitting signals, and the omnibearing monitoring of the relative distance between surrounding rocks of the roadway is realized; the surface of the roadway roof, the roadway floor and the roadway wall at two sides are respectively provided with a movement amount sensor; the separation layer sensor, the infrared ranging sensor and the moving amount sensor are connected with a multichannel A/D converter with the model of AD7706BRZ through signals, the multichannel A/D converter is connected with a singlechip with the model of MSP430F, and the singlechip processes monitoring information and transmits the monitoring information to a monitoring substation through a wireless transceiver module;
The monitoring substation 1 is in wireless connection with the singlechip through a duplex wireless transceiver networking module with the model of CC2530, comprises a central processing unit, a wireless communication module, a display module and an alarm which are connected with the central processing unit and are used for dynamically acquiring sensor node information and displaying the sensor node information in real time, and simultaneously transmitting the acquired information to a ground monitoring center through an industrial Ethernet communication system,
The ground monitoring center is connected with the monitoring substation line, and is used for counting and displaying dynamic distribution curves, recording and judging roadway deformation and risks in real time by the industrial personal computer and the display, and triggering the ground and alarming underground in an abnormal mode.
The same type of sensor of the wireless sensor node is distributed in a group every 100-150 meters.
The monitoring substations are arranged one for each 100-150 meters in the roadway.
Claims (3)
1. A wireless monitoring and early warning method for multi-azimuth stress and deformation of a coal mine roadway comprises the following steps:
a. The method comprises the steps of dynamically monitoring the stress of surrounding rock of a roadway, respectively arranging a plurality of groups of drilling holes on two side walls of the roadway with obvious coal-rock dynamic phenomena on a working face or a working face according to the direction of a bedding layer and a reverse layer, wherein the drilling depth is 10-15 m, simultaneously, respectively arranging a plurality of groups of drilling holes on a top plate and a bottom plate at an included angle of 20-30 degrees in the bedding direction, wherein the drilling depth of the bottom plate is 10-15 m, the drilling depth of the top plate is 15-20 m, monitoring the stress change rule of the surrounding rock of the roadway through the drilling holes on four wall faces, and the interval of each group of drilling holes is 100-150 m; the method comprises the steps that a cube three-dimensional stress monitoring sensor is arranged in a drill hole through a hollow elastic rod, a signal transmission cable of the monitoring sensor leads out the position of a roadway wall through the hollow elastic rod, the signal transmission cable is connected with a single chip microcomputer through an A/D converter, the single chip microcomputer carries out three-dimensional coal rock mass dynamic stress monitoring through feedback of the cube three-dimensional stress monitoring sensor, and the processed signal is transmitted to a monitoring substation through a single chip microcomputer wireless communication module; grooves are formed in three orthogonal surfaces of the cube three-dimensional stress monitoring sensor, three resistance type strain sensing units are arranged in the grooves according to an equiangular strain combination building configuration model, and the surfaces of the three resistance type strain sensing units are covered with a protective coating;
The three-dimensional coal rock mass dynamic stress monitoring in the step a is characterized in that a configuration model is built on a single plane by using three strain gauges according to equiangular strain combinations, and three resistance strain sensing units are respectively arranged in the single component arrangement direction: ; optional three directions/> Line strain/>; Then utilize strain state equation, will/>Substituting to obtain measurement of single plane strain;
，
，
the strain of the single component of the three resistance strain sensing units on the plane is as follows:
，
The maximum and minimum principal stresses in a single direction can be obtained according to the strain state equation:
，
Three resistance strain sensing units are combined into a group of equiangular strain combination configuration calculation models, and the maximum main strain in a single orthogonal plane can be obtained Minimum principal strain/>；
According to Hooke's law, the plane principal stress maximum value can be obtained:
，
In the middle of Is the maximum principal stress in plane,/>Is the minimum principal stress in plane,/>The elastic modulus of the stratum rock body where the ground stress sensor is positioned;
The three-dimensional space stress of the coal rock mass can be represented by three mutually orthogonal planes, the stress of each orthogonal plane is monitored through an equiangular strain combination consisting of three resistance strain sensing units, and the maximum principal stress is removed after the calculation method is adopted; maximum principal stress space mechanics vector synthesis of three orthogonal planes xoy, xoz, yoz can obtain the maximum principal stress of the three-dimensional space 、、/>The direction angle is/>; The maximum principal stress of the three-dimensional space is projected to three coordinate axes respectively, so that a three-dimensional space stress value/>，
，
Three-dimensional spatial stress valueVector synthesis three-dimensional space maximum principal stress/>The method comprises the following steps:
，
The monitoring system dynamically monitors three resistance type strain sensing units on each orthogonal surface to obtain single-sided stress, and finally obtains three-dimensional space stress and a maximum main stress value according to the calculation method;
b. dynamic monitoring of roadway deformation, arranging separation layer sensors on the roadway roof, the roadway floor and roadway walls on two sides respectively, and placing a probe into the roadway wall surrounding rock; the method comprises the steps that the transmitting modules and the receiving modules of the infrared ranging sensors are symmetrically arranged on the surfaces of a roadway top, a bottom plate and the roadway wall of the left side wall and the right side wall respectively, the two modules are required to be opposite, the deviation angle is +/-15 degrees, the distance is calculated through receiving and transmitting signals, and the omnibearing monitoring of the relative distance between surrounding rocks of the roadway is realized; the surface of the roadway roof, the roadway floor and the roadway wall at two sides are respectively provided with a movement amount sensor; the separation layer sensor, the infrared ranging sensor and the movement sensor are connected with the A/D converter through signals and are transmitted into the singlechip, and the singlechip processes monitoring information and transmits the monitoring information to the monitoring substation through the wireless transceiver module;
c. Arranging a monitoring substation every 150-200 m in a roadway of a mining working face, dynamically acquiring and displaying stress and deformation parameters in real time in a wireless communication mode, connecting a nearby industrial Ethernet switch at an inlet of the mining working face, and transmitting detection information to a ground monitoring center through an underground industrial Ethernet communication system; the monitoring substation sets a related monitoring parameter threshold value, and triggers an alarm to alarm in situ after overrun;
The ground monitoring center is composed of an industrial personal computer and a display, wherein the industrial personal computer is used for importing monitoring data into a database, statistically analyzing monitoring parameters, displaying stress and deformation states in a window through a dynamic distribution curve, constructing a roadway surrounding rock damage risk judging model by setting stress and deformation weights, and integrating an abnormal early warning value F to obtain a calculation formula:
Wherein: ，/>～/> As for the weight of a certain parameter, A, B, C, D is the value of the monitoring parameter, and A0, B0, C0 and D0 are the early warning threshold values of the monitoring parameter respectively; meanwhile, the monitoring and early warning software is also provided with an abnormal filtering function, and when the infrared ranging transceiver module is shielded, false alarms are avoided through checking and correcting other parameters.
2. The wireless monitoring and early warning method for multi-azimuth stress and deformation of a coal mine roadway according to claim 1, which is characterized in that: after the three-dimensional stress sensor for drilling is placed in, hole sealing is carried out, the hole sealing pressure of cement mortar is 1MPa, and the hole sealing time is kept for 10 minutes.
3. The monitoring and early warning system based on the coal mine roadway multi-azimuth stress and deformation wireless monitoring and early warning method is characterized in that:
comprises a monitoring center, a plurality of groups of wireless sensor nodes distributed on the wall surface of a roadway and embedded in surrounding rock drilling, a plurality of monitoring substations arranged on the wall surface of the roadway and a plurality of single-chip computers,
The wireless sensor node comprises a separation layer sensor, a moving-near quantity sensor, a laser ranging sensor and a cube three-dimensional stress monitoring sensor, wherein the cube three-dimensional stress monitoring sensor is arranged in drilling holes which are arranged in the direction of a bedding layer and a reverse layer and are respectively arranged at an included angle of 20-30 degrees in the direction of the bedding layer on two side walls of a roadway with obvious coal-rock dynamic phenomenon, three orthogonal surfaces of the cube three-dimensional stress monitoring sensor are provided with grooves, three resistance type strain sensing units are arranged in the grooves according to an equiangular strain combination building configuration model, and the surfaces of the three resistance type strain sensing units are covered with a protective coating; the moving-near quantity sensor, the separation layer sensor and the laser ranging sensor are arranged in the drilled holes on the roadway top, the roadway bottom plate and the roadway walls at two sides; the wireless sensor node and the monitoring substation are connected with the singlechip through an A/D converter, the same type of sensor of the wireless sensor node is distributed into a group every 100-150 meters,
The monitoring substation is connected with the singlechip in a wireless data way and comprises a central processor, a wireless communication module, a display module and an alarm which are connected with the central processor, and is used for dynamically collecting sensor node information and displaying the sensor node information in real time, and simultaneously transmitting the collected information to a ground monitoring center through an industrial Ethernet communication system, wherein the monitoring substation is arranged in each tunnel for 100-150 meters,
The ground monitoring center is connected with the monitoring substation line, is used for statistically displaying dynamic distribution curves by the industrial personal computer and the display, records and judges roadway deformation and risks in real time, and simultaneously alarms on the ground and underground due to abnormal triggering.
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| CN202011290400.2A CN112302722B (en) | 2020-11-17 | 2020-11-17 | Coal mine roadway multidirectional stress and deformation wireless monitoring and early warning method and system |
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| CN113217108B (en) * | 2021-06-03 | 2022-08-16 | 宁夏回族自治区矿产地质调查院 | Early warning system for monitoring coal and gas outburst |
| CN114320468B (en) * | 2021-12-23 | 2024-03-22 | 中国神华能源股份有限公司神东煤炭分公司 | Roadway surrounding rock ore pressure detection device and method |
| CN116793548A (en) * | 2023-05-11 | 2023-09-22 | 西南交通大学 | Tunnel anchor rod pressure data representation early warning method and related equipment |
| CN116816441A (en) * | 2023-06-02 | 2023-09-29 | 济南福深兴安科技有限公司 | Optical fiber roof safety on-line monitoring system |
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