CN116816441A - Optical fiber roof safety on-line monitoring system - Google Patents
Optical fiber roof safety on-line monitoring system Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 113
- 238000012544 monitoring process Methods 0.000 title claims abstract description 78
- 239000003245 coal Substances 0.000 claims abstract description 77
- 239000000835 fiber Substances 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000005065 mining Methods 0.000 claims abstract description 11
- 230000032798 delamination Effects 0.000 claims description 61
- 238000000926 separation method Methods 0.000 claims description 57
- 238000004364 calculation method Methods 0.000 claims description 30
- 238000005553 drilling Methods 0.000 claims description 22
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 13
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002265 prevention Effects 0.000 description 1
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Abstract
The invention relates to the field of mine safety monitoring, in particular to an optical fiber roof safety online monitoring system, which comprises an optical fiber sensor, a control unit and a control unit, wherein the optical fiber sensor is used for monitoring each point data information in a coal mine; a communication optical cable as a medium for data transmission; the mining intrinsic safety type fiber grating demodulator is used as a monitoring master station; the ring network exchanger is used as an up-and-down connection medium of the mine; the server is used as an underground data transmission terminal, analyzes underground collected data, judges the current state of a current underground position, and makes further risk prediction on a judging result. The invention adopts an advanced optical fiber sensing technology to dynamically monitor the falling-off condition of the top plate, the stability of the anchor bolt support, the potential danger, the advancing speed of stress and the like for a long time, thereby providing reliable guarantee for the safety production of coal mines.
Description
Technical Field
The invention relates to the field of mine safety monitoring, in particular to an optical fiber roof safety on-line monitoring system.
Background
The detection of mine roof and surrounding rock is an important project for predicting mine disasters, mine roof collapse of surrounding rock is one of oversized disasters of various mines, production safety of the mines is seriously threatened, and huge economic loss and casualties can be caused when the mine roof and the surrounding rock occur. In recent years, due to the continuous extension of a tunneling surface and the expansion of a mining range, mine production is advanced to a deep depth, roof collapse and collapse are also increasingly serious, prevention and control tasks are also increasingly difficult, and mine roof disasters seriously threaten the life safety of mine miners.
Chinese patent publication No.: CN103510986a discloses a roadway roof separation dynamic monitoring system and an early warning method based on fiber bragg gratings, which comprises a ground data processing and controlling subsystem, an underground data transmission and communication subsystem and an underground sensing data acquisition subsystem: the ground data processing and subsystem is arranged in a ground control center room and consists of a ground upper main monitoring computer, a fiber grating demodulation device and a power supply; the underground transmission communication subsystem consists of a mining transmission optical fiber and an optical fiber junction box; the underground sensing data acquisition subsystem comprises at least one fiber bragg grating roof separation layer monitoring device.
Therefore, the dynamic monitoring system is not only required to monitor the separation layer of the roadway roof, but also has the following problems in other aspects: the falling-off condition of the roof, the stability and the potential danger of the anchor bolt support, the advanced support stress influence range, the advancing speed of the stress and the like are dynamically monitored for a long time, and the mine roof disaster seriously threatens the life safety of mine miners.
Disclosure of Invention
Therefore, the invention provides an optical fiber roof safety on-line monitoring system which is used for solving the problems of long-term dynamic monitoring aiming at the falling-off condition of a roof, the stability and potential danger of anchor rod support, the influence range of advanced support stress, the advancing speed of stress and the like in the prior art.
In order to achieve the above object, the present invention provides an optical fiber roof safety on-line monitoring system, comprising:
the optical fiber sensor is used for monitoring data information of each point in the coal mine and comprises the steps of monitoring the separation layer quantity of the top plate, calculating the separation layer speed, monitoring the stress condition of underground anchor rod support of the coal mine and monitoring the stress of coal pillars;
the communication optical cable is used as a medium for data transmission, adopts concentric optical fibers and is used for data transmission among different types of optical fiber sensors;
the mining intrinsic safety type fiber bragg grating demodulator is used as a monitoring master station and is connected with the optical fiber sensor through the communication optical cable, so that the optical signal of the optical fiber sensor can be read and converted into physical quantity;
the ring network switch is used as a connecting medium for the upper and lower sides of the mine, and the data of the mine intrinsic safety type fiber bragg grating demodulator is uploaded through the ring network switch connected with the general optical cable;
the server is used as an underground data transmission terminal and is connected with the ring network switch through the communication optical cable and the Xiang Benan type fiber bragg grating demodulator to analyze underground collected data, and comprises the steps of judging an underground overall safety state through the data collected by the fiber optic sensor, analyzing the independent safety state of each point position collected by the fiber optic sensor, and determining a risk reason for the point position with risk according to the collected data; and predicting and alarming risks possibly occurring at each acquisition point in the underground coal mine according to the judgment of the server on the actual acquisition result of the optical fiber sensor.
Further, the optical fiber sensor includes: the optical fiber roof separation sensors are provided with a plurality of separation sensors for monitoring the separation amount of the roof and calculating the separation speed, and each optical fiber roof separation sensor acquires the actual separation amount and the actual separation speed of the corresponding point position;
the optical fiber anchor rod stress sensors are provided with a plurality of optical fiber anchor rod stress sensors and are used for monitoring stress conditions of underground anchor rod supports of coal mines, and each optical fiber anchor rod stress sensor acquires actual stress of an anchor rod at a corresponding point;
the optical fiber drilling stress sensors are provided with a plurality of optical fiber drilling stress sensors and are used for monitoring the stress of coal pillars, and each optical fiber drilling stress sensor is used for collecting the actual stress of the coal pillars at corresponding points.
Further, the server integrates data of all the collected actual delamination amount, actual delamination speed anchor actual stress and actual stress of the coal pillar, calculates a safety score, and a safety score threshold is arranged in the server; if the safety score is smaller than the set safety score threshold, the server judges that the current underground determined position state is safe; and if any safety score of the determined position is greater than or equal to the set safety score, the server judges that the current underground determined position is unsafe.
Further, the server is internally provided with calculation compensation parameters set for each acquired data, the calculation compensation parameters are used for calculating and compensating each item of data with calculated safety scores, two functions of any calculation compensation parameter are realized, one calculation parameter is an adjustment calculation result, the other calculation parameter is a balance calculation dimension, and the numerical value of any calculation compensation parameter is determined according to the numerical value of the calculation compensation data.
Further, the numerical value of any calculated compensation parameter is determined according to the numerical value of the calculated compensation data, wherein the server is internally provided with compensation values in different states corresponding to a separation layer quantity difference value, a separation layer speed difference value, an anchor rod stress difference value and a coal column stress difference value.
Further, for any one of the optical fiber roof separation sensors, a separation amount safety threshold and a separation speed safety threshold are set in the server, and the optical fiber roof separation sensor detects the actual separation amount and separation speed of the roof and compares the actual separation amount and separation speed with each corresponding safety threshold; if the actual delamination amount and the actual delamination speed are smaller than the actual safety threshold value, the server judges that the current state of the top plate is safe; and if at least one of the actual delamination amount and the actual delamination speed is greater than or equal to a corresponding safety threshold value, the server judges that the current state of the top plate is unsafe.
Further, the server determines the delamination speed safety threshold through the actual delamination amount, and the greater the actual delamination amount is, the smaller the delamination speed threshold is.
Further, for any one of the optical fiber anchor rod stress sensors, an anchor rod stress safety threshold value is arranged in the optical fiber anchor rod stress sensor arranged in the server;
if the actual stress of the anchor rod is smaller than the anchor rod stress safety threshold, judging that the anchor rod does not reach the yield limit; and if the actual stress of the anchor rod is greater than or equal to the anchor rod stress safety threshold, judging that the anchor rod reaches the yield limit.
Further, the optical fiber drilling stress sensor monitors the stress of the coal pillar in front of the underground working face of the coal mine; the server is internally provided with a mine coal pillar stress detection safety threshold and a stress influence range, and the optical fiber drilling sensor monitors the actual stress of the mine coal pillar;
if the actual stress of the monitored mine coal pillar is greater than or equal to the coal pillar stress detection safety threshold, judging that the anchor rod is supported in advance; and if the monitored actual stress value of the mine coal pillar is smaller than the coal pillar stress detection safety threshold, judging that the anchor rod is normally supported.
Further, the optical fiber roof safety on-line monitoring system further comprises a mining wireless optical fiber grating demodulator which is used as a monitoring substation for effectively supplementing data collected by the server when the monitoring density needs to be increased, and the data are communicated with the monitoring master station in a wireless mode.
Compared with the prior art, the method has the beneficial effects that the safety state of the whole underground coal mine is comprehensively acquired and judged according to various data monitored by the front-end optical fiber sensor in real time, and the risk reasons are determined according to the acquired data for the points with risks; each optical fiber sensor is arranged flexibly, and each optical fiber sensor judges different positions under the coal mine, so that the monitoring is more targeted.
Furthermore, the front-end optical fiber sensor does not need to supply power, so that the intrinsically safe power supply is realized, and the multiplexing capability of the system is strong; each optical fiber sensor acquires data acquisition of each installation position through flexible arrangement, monitors different types of underground data in real time, and performs more accurate condition prediction on the underground data of a coal mine; setting calculation parameters and ensuring the prediction of data trend by security score; the safety score is calculated through the multi-point data comprehensive calculation, so that the underground environment presents the overall more visual datamation characteristic, the safety state of each detail processing result can be directly judged and threshold value alarm is carried out, and trend prediction alarm is carried out; judging the roof state server according to the roof delamination amount and delamination speed, and displaying the roof at a specific position in real time and alarming the threshold value to ensure the safety of the coal mine roof; the method comprises the steps that a judgment is made according to the actual stress of an anchor rod aiming at an anchor rod supporting state server, and the safety of coal mine anchor rod supporting is ensured for the stability and potential danger of the anchor rod supporting at a specific position; judging the coal body stress according to the actual stress of the coal pillar, judging the coal body pressure according to the coal pillar stress at a specific position, and ensuring the safety of coal mine anchor bolt support; for mines with complex conditions or large detection ranges, the data of the monitoring master station are supplemented by arranging a plurality of monitoring substations.
Further, the optical fiber roof safety on-line monitoring system is easy to maintain; the accuracy and trend analysis of the result obtained by integrating the data are more reliable; the calculation result is more accurate, the corresponding risk prediction is conveniently carried out on the real-time monitoring data, and the timeliness and effectiveness of underground safety monitoring are ensured; the accuracy of the environment determination is increased.
Further, a more refined data monitoring station is added to the more complex mine environment, so that detection data are more detailed, and the accuracy of a judgment result of the optical fiber roof safety on-line monitoring system is improved.
Drawings
Fig. 1 is a schematic diagram of a system structure including only a monitoring master station according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system structure including a monitoring master station and a monitoring slave station according to an embodiment of the present invention.
The system comprises a server 1, a ring network exchanger 2, a mining intrinsic safety type optical fiber grating demodulator 3, an optical fiber roof separation layer sensor 4, an optical fiber anchor rod stress sensor 5, an optical fiber drilling stress sensor 6 and a mining wireless optical fiber grating demodulator 7.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
The invention provides an optical fiber roof safety on-line monitoring system which is used for solving the problems of long-term dynamic monitoring aiming at the falling-off condition of a roof, the stability and potential danger of anchor bolt support, the influence range of advanced support stress, the advancing speed of stress and the like in the prior art.
As shown in fig. 1, the embodiment of the present invention only includes a system structure schematic diagram of a monitoring master station, including: the optical fiber sensor is used for monitoring data information of each point in the coal mine and comprises the steps of monitoring the separation layer quantity of the top plate, calculating the separation layer speed, monitoring the stress condition of underground anchor rod support of the coal mine and monitoring the stress of coal pillars;
the communication optical cable is used as a medium for data transmission, adopts concentric optical fibers and is used for data transmission among different types of optical fiber sensors;
the mining intrinsic safety type optical fiber grating demodulator 3 is used as a monitoring main station and is connected with the optical fiber sensor through the communication optical cable, and can read optical signals of the optical fiber sensor and convert the optical signals into physical quantities;
the ring network exchanger 2 is used as a connecting medium for the upper and lower sides of the mine, and the data of the mine intrinsic safety type fiber bragg grating demodulator is uploaded through the ring network exchanger connected with the selective optical cable;
the server 1 is used as an underground data transmission terminal and is connected with the ring network switch through the communication optical cable and the Xiang Benan type fiber bragg grating demodulator to analyze underground collected data, and comprises the steps of judging an underground overall safety state through the data collected by the fiber optic sensor, analyzing the independent safety state of each point location collected by the fiber optic sensor, and determining a risk reason for the point location with risk according to the collected data; and predicting and alarming risks possibly occurring at each acquisition point in the underground coal mine according to the judgment of the server on the actual acquisition result of the optical fiber sensor.
Specifically, the optical fiber sensor includes: the optical fiber roof separation sensors 4 are provided with a plurality of separation sensors for monitoring the separation amount of the roof and calculating the separation speed, and each optical fiber roof separation sensor acquires the actual separation amount and the actual separation speed of the corresponding point position;
the optical fiber anchor rod stress sensors 5 are provided with a plurality of optical fiber anchor rod stress sensors and are used for monitoring stress conditions of underground anchor rod supports of coal mines, and each optical fiber anchor rod stress sensor is used for collecting actual stress of anchor rods at corresponding points;
and the optical fiber drilling stress sensors 6 are provided with a plurality of optical fiber drilling stress sensors for monitoring the stress of the coal pillar, and each optical fiber drilling stress sensor is used for collecting the actual stress of the coal pillar at a corresponding point.
In order to facilitate the display of each specific point of the optical fiber sensor, the server is correspondingly numbered for different types of optical fiber sensors under a plurality of stored positions.
The optical fiber roof separation sensors stored in the server are respectively marked as a first optical fiber roof separation sensor A1 and a second optical fiber roof separation sensor A2 … … and an x-th optical fiber roof separation sensor Ax.
Specifically, the server marks a plurality of optical fiber anchor rod stress sensors stored in the server as a first optical fiber anchor rod stress sensor B1, a second optical fiber anchor rod stress sensor B2 … … and a y-th optical fiber anchor rod stress sensor By respectively.
Specifically, the server records a plurality of stored fiber drilling stress sensors as a first fiber drilling stress sensor C1 and a second fiber drilling stress sensor C2 … … z-th fiber drilling stress sensor Cz respectively.
Each optical fiber sensor acquires data acquisition of each installation position through flexible arrangement, monitors different types of underground data in real time, and estimates the situation of the underground data of the coal mine more accurately.
Specifically, the server is internally provided with a calculation compensation parameter set for each acquired data, and the calculation compensation parameter is used for calculating and compensating each item of data of which the calculation security score is.
Because the separation speed of the optical fiber top plate, the separation amount, the data dimension of the anchor rod stress and the drilling stress on the underground safety reaction are different from the data weight, the corresponding calculation compensation parameters are set for different point positions and different kinds of data, two functions are applied to any calculation compensation parameter, one function is to adjust the calculation result, and the other function is to balance the calculation dimension, so that the calculation result is more accurate, and the timeliness and the effectiveness of underground safety monitoring are ensured.
And the server integrates the data of all the acquired actual delamination quantity Li, the actual delamination speed Vi, the actual anchor rod stress sigma j and the actual coal pillar stress Pk again, and calculates a safety score S2, wherein the safety score threshold in the server is set to S1.
Specifically, the value of any calculated compensation parameter is determined from the value of its calculated compensation data.
For any one of the monitored data, there may be three existing states, one is that the safety value of the data exceeds the position safety value of the data, the other is that the safety value of the data is close to but not exceeds the position safety value of the data, the other is that the safety value of the data is far from and not exceeds the position safety value of the data, and different values are given to the different states of the data, so that the corresponding risk prediction for the real-time monitoring data is convenient.
When any data is within the qualified detection standard, if a certain risk probability still exists when the detection values of all data or most data approach the critical value, any detected data is endowed with a larger calculation compensation value, all detection results are overlapped at the moment, the underground position is still judged to be unsafe, the condition that the underground single detection meets the standard is prevented, but the overlarge deviation seriously affects the underground safety of a coal mine, the safety of underground personnel is ensured, and the on-line monitoring system for the safety of an optical fiber roof can predict the upcoming risk so that a manager can properly adjust the arrangement of underground staff.
In order to facilitate the display of real-time monitoring values of specific points of the optical fiber sensors, the server carries out label processing on real-time data values detected by a plurality of different types of optical fiber sensors stored in the server and safety thresholds corresponding to the real-time data.
For any optical fiber roof separation sensor Ai, i=1, 2,..x, detecting an actual separation quantity Li of a corresponding point location and an actual separation speed Vi of the corresponding point location, wherein a separation quantity safety threshold L2i and a separation speed safety threshold V2i for the detection position of the ith optical fiber roof separation sensor Ai are arranged in the server.
For any optical fiber anchor rod stress sensor Bj, j=1, 2,..y, the actual anchor rod stress sigma j of the corresponding point is detected, and a stress safety threshold sigma 2j for the j anchor rod is arranged in the server.
For any fiber drilling stress sensor Ck, k=1, 2,..z, it detects the coal pillar actual stress Pk of the corresponding point location, and the server is provided with the coal pillar stress safety threshold P2k for the k-th fiber drilling stress sensor Ck detection position.
The numerical value of any calculated compensation parameter is determined according to the numerical value of the calculated compensation data, wherein different compensation values corresponding to a separation layer quantity difference value Lci, a separation layer speed difference value Vci, an anchor rod stress difference value sigma cj and a stress difference value Pck of a coal column are arranged in the server.
The calculated compensation parameters are a separation layer quantity compensation parameter Di, a separation layer speed compensation parameter Ei, an anchor rod stress compensation parameter Fj and a coal pillar stress compensation parameter Gk.
For the delamination amount compensation parameter Di, the delamination amount calculation difference lci=li-L2 i is set, and the larger the value of Lci, the larger Di. For the delamination speed compensation parameter Vi, the delamination quantity calculation difference vci=vi-V2 i is set, and the larger the value of Vci, the larger Ei. For the anchor stress compensation parameter Fj, the anchor stress calculation difference σcj=σj—σ2j is set, and Fj is larger as the value of σcj is larger. For the pillar stress compensation parameter Gk, the pillar stress calculation difference pck=pk-p2k is set, with the value of Pck being larger as the value is larger.
The security score S2 is set according to computational logic within the server as follows:
if the security score S2 is smaller than the set security score threshold S1, the server judges that the current underground determined position state is safe; after each item is subjected to the security scoring, if any item of security scoring S2 of the determined position is greater than or equal to a set security scoring threshold S1, the server judges that the current underground determined position state is unsafe.
The safety scores are calculated through multi-point data comprehensive calculation, so that the underground environment presents the overall more visual data characteristic, the safety state of each detail processing result can be directly judged and threshold value alarmed, trend prediction alarm is carried out, and the environment judgment accuracy is further improved.
Specifically, a delamination amount safety threshold L2i and a delamination speed safety threshold V2i are set in the server, and the optical fiber roof delamination sensor detects the actual delamination amount Li and the actual delamination speed Vi of the roof and compares the detected actual delamination amount Li and the detected actual delamination speed Vi with the corresponding safety thresholds, namely the delamination amount safety threshold L2i and the delamination speed safety threshold V2i.
If the actual delamination quantity Li and the actual delamination speed Vi are smaller than the corresponding safety threshold values, namely the delamination quantity safety threshold value L2i and the delamination speed safety threshold value V2i, the server judges that the current state of the top plate is safe;
if at least one of the actual delamination quantity Li and the actual delamination speed Vi is greater than or equal to a corresponding safety threshold value, namely a delamination quantity safety threshold value L2i and a delamination speed safety threshold value V2i, the server judges that the current state of the top plate is unsafe.
Specifically, the server determines the delamination speed safety threshold V2i from the actual delamination amount Li, and the greater the actual delamination amount Li, the smaller the delamination speed safety threshold V2i.
And judging the roof state server according to the roof delamination amount and delamination speed, and displaying the roof at a specific position in real time and alarming the threshold value to ensure the safety of the coal mine roof.
Specifically, for any one of the optical fiber anchor rod stress sensors, an anchor rod stress safety threshold sigma 2j is arranged in the optical fiber anchor rod stress sensor arranged in the server;
if the actual stress sigma j of the anchor rod is smaller than the anchor rod stress safety threshold sigma 2j, judging that the anchor rod does not reach the yield limit; and if the actual stress sigma j of the anchor rod is larger than or equal to the anchor rod stress safety threshold sigma 2j, judging that the anchor rod reaches the yield limit.
The anchor bolt supporting state server judges according to the actual stress of the anchor bolt, and the safety of the coal mine anchor bolt supporting is ensured for the stability and potential danger of the anchor bolt supporting at a specific position.
Specifically, the optical fiber drilling stress sensor monitors the stress of a coal pillar in front of a coal mine underground working face; and a mine coal pillar stress safety threshold value P2k is arranged in the server, and the optical fiber drilling sensor monitors the actual stress Pk of the mine coal pillar.
If the actual stress Pk of the monitored mine coal pillar is greater than or equal to the coal pillar stress safety threshold value P2k, judging that the mine coal pillar is supported in advance; and if the monitored actual stress Pk of the mine coal pillar is smaller than the coal pillar stress safety threshold value P2k, judging that the mine coal pillar is normally supported.
And judging the coal body stress according to the actual stress of the coal pillar, judging the coal body pressure according to the coal pillar stress at a specific position, and ensuring the safety of the coal mine anchor bolt support.
Fig. 2 is a schematic diagram of a system structure including a monitoring master station and a monitoring substation according to an embodiment of the present invention, where the optical fiber roof safety online monitoring system further includes a mining wireless optical fiber grating demodulator 7 as the monitoring substation, and in a situation where the monitoring density needs to be increased, the data collected by the server is effectively supplemented, and the data is communicated with the server in a wireless manner.
For mines with complex conditions or large detection ranges, the data of the monitoring master station are supplemented by arranging a plurality of monitoring substations.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical fiber roof safety on-line monitoring system, comprising:
the optical fiber sensor is used for monitoring data information of each point in the coal mine and comprises the steps of monitoring the separation layer quantity of the top plate, calculating the separation layer speed, monitoring the stress condition of underground anchor rod support of the coal mine and monitoring the stress of coal pillars;
the communication optical cable is used as a medium for data transmission, adopts concentric optical fibers and is used for data transmission among different types of optical fiber sensors;
the mining intrinsic safety type fiber bragg grating demodulator is used as a monitoring master station and is connected with the optical fiber sensor through the communication optical cable, so that the optical signal of the optical fiber sensor can be read and converted into physical quantity;
the ring network switch is used as a connecting medium for the upper and lower sides of the mine, and the data of the mine intrinsic safety type fiber bragg grating demodulator is uploaded through the ring network switch connected with the general optical cable;
the server is used as an underground data transmission terminal and is connected with the ring network switch through the communication optical cable and the Xiang Benan type fiber bragg grating demodulator to analyze underground collected data, and comprises the steps of judging an underground overall safety state through the data collected by the fiber optic sensor, analyzing the independent safety state of each point position collected by the fiber optic sensor, and determining a risk reason for the point position with risk according to the collected data; and predicting and alarming risks possibly occurring at each acquisition point in the underground coal mine according to the judgment of the server on the actual acquisition result of the optical fiber sensor.
2. The fiber optic roof safety on-line monitoring system of claim 1, wherein the fiber optic sensor comprises:
the optical fiber roof separation sensors are provided with a plurality of separation sensors for monitoring the separation amount of the roof and calculating the separation speed, and each optical fiber roof separation sensor acquires the actual separation amount and the actual separation speed of the corresponding point position;
the optical fiber anchor rod stress sensors are provided with a plurality of optical fiber anchor rod stress sensors and are used for monitoring stress conditions of underground anchor rod supports of coal mines, and each optical fiber anchor rod stress sensor acquires actual stress of an anchor rod at a corresponding point;
the optical fiber drilling stress sensors are provided with a plurality of optical fiber drilling stress sensors and are used for monitoring the stress of coal pillars, and each optical fiber drilling stress sensor is used for collecting the actual stress of the coal pillars at corresponding points.
3. The optical fiber roof safety online monitoring system according to claim 2, wherein the server performs data integration on all the collected actual delamination amount, actual delamination speed, actual stress of an anchor rod and actual stress of a coal pillar, calculates a safety score, and a safety score threshold is set in the server;
if the safety score is smaller than the set safety score threshold, the server judges that the current underground determined position state is safe; and if the safety score is greater than or equal to the set safety score, the server judges that the current underground determined position state is unsafe.
4. The optical fiber roof safety online monitoring system according to claim 3, wherein the server is internally provided with calculation compensation parameters set for each collected data, and for any calculation compensation parameter, corresponding calculation compensation is performed according to each item of data of the calculation safety score.
5. The system for on-line monitoring of optical fiber roof safety according to claim 4, wherein the value of any calculated compensation parameter is determined according to the value of the calculated compensation data, wherein the server is internally provided with compensation values in different states corresponding to a delamination amount difference value, a delamination speed difference value, an anchor rod stress difference value and a coal column stress difference value.
6. The optical fiber roof safety online monitoring system according to claim 3, wherein for any optical fiber roof delamination sensor, a delamination amount safety threshold and a delamination speed safety threshold are set in the server, and the optical fiber roof delamination sensor detects the actual delamination amount and delamination speed of the roof and compares the actual delamination amount and delamination speed with each corresponding safety threshold;
if the actual delamination amount and the actual delamination speed are smaller than the corresponding safety threshold values, the server judges that the current state of the top plate is safe;
and if at least one of the actual delamination amount and the actual delamination speed is greater than or equal to a corresponding safety threshold value, the server judges that the current state of the top plate is unsafe.
7. The fiber optic roof safety online monitoring system according to claim 6, wherein the server determines the delamination speed safety threshold by an actual delamination amount, the greater the actual delamination amount, the smaller the delamination speed threshold.
8. The optical fiber roof safety on-line monitoring system according to claim 3, wherein for any one of the optical fiber anchor stress sensors, an anchor stress safety threshold is set in the server with the optical fiber anchor stress sensor;
if the actual stress of the anchor rod is smaller than the anchor rod stress safety threshold, judging that the anchor rod does not reach the yield limit; and if the actual stress of the anchor rod is greater than or equal to the anchor rod stress safety threshold, judging that the anchor rod reaches the yield limit.
9. The fiber optic roof safety on-line monitoring system of claim 3, wherein the fiber optic borehole stress sensor monitors the coal column stress in front of the coal mine underground working face; the server is internally provided with a mine coal pillar stress safety threshold, and the optical fiber drilling sensor monitors the actual stress of the mine coal pillar;
if the actual stress of the monitored mine coal pillar is greater than or equal to the coal pillar stress safety threshold, judging that the anchor rod is supported in advance; and if the monitored actual stress value of the mine coal pillar is smaller than the coal pillar stress safety threshold, judging that the anchor rod is normally supported.
10. The system according to any one of claims 1-8, further comprising a mining wireless fiber bragg grating demodulator as a monitoring substation for effectively supplementing data collected by the server, the data being in communication with the monitoring master station wirelessly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310647556.9A CN116816441A (en) | 2023-06-02 | 2023-06-02 | Optical fiber roof safety on-line monitoring system |
Applications Claiming Priority (1)
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