CN107328503B - coal mine tunnel roof stress on-line monitoring system and method based on fiber bragg grating sensor - Google Patents
coal mine tunnel roof stress on-line monitoring system and method based on fiber bragg grating sensor Download PDFInfo
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- CN107328503B CN107328503B CN201710561839.6A CN201710561839A CN107328503B CN 107328503 B CN107328503 B CN 107328503B CN 201710561839 A CN201710561839 A CN 201710561839A CN 107328503 B CN107328503 B CN 107328503B
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- 239000000835 fiber Substances 0.000 title claims abstract description 106
- 238000012544 monitoring process Methods 0.000 title claims abstract description 101
- 239000003245 coal Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 61
- 238000012806 monitoring device Methods 0.000 claims abstract description 50
- 230000003068 static effect Effects 0.000 claims abstract description 24
- 238000004891 communication Methods 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000005065 mining Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000007547 defect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/247—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet using distributed sensing elements, e.g. microcapsules
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
Abstract
A coal mine tunnel roof stress on-line monitoring system and method based on a fiber bragg grating sensor are suitable for the field of tunnel mine pressure monitoring. The coal mine tunnel roof stress on-line monitoring system based on the fiber bragg grating sensor comprises monitoring stations arranged on tunnel roofs on two sides of a coal face, each monitoring station comprises three roof stress monitoring devices, the roof stress monitoring devices in each monitoring station are connected in series through communication optical fibers, an outgoing end fiber pigtail of the monitoring station at the tail end of each tunnel is connected with a fiber optic terminal box through the communication optical fibers, the fiber optic terminal box is connected with a fiber bragg grating static demodulator arranged on the ground surface through a mine transmission optical cable, the fiber bragg grating static demodulator is sequentially connected with a monitoring computer and a network server, and the network server is connected with a plurality of clients through a coal mine local area network; the device has high measurement precision and long service life, and can realize real-time on-line monitoring of the roof stress of the coal mine tunnel.
Description
Technical Field
The invention relates to a monitoring system and a monitoring method, in particular to a coal mine tunnel roof stress on-line monitoring system and a coal mine tunnel roof stress on-line monitoring method based on a fiber grating sensor, which are suitable for the field of tunnel mine pressure monitoring.
background
Along with the continuous increase of the coal mining depth of China, the stress change of a roadway roof and a goaf roof is more and more complex, and over the last decade, thousands of roof accidents causing death in domestic coal mines account for nearly half of the total number of the coal mine accidents, so that the stress change of the coal mine roadway roof is monitored in real time, the stability of the roof is judged, effective protective measures are taken in time, and the method has great practical significance for preventing frequent roof accidents.
The sensing principle of the original fiber grating force-measuring anchor rod is that the force-measuring anchor rod is subjected to tensile strain and then is strained together with a grating attached to the force-measuring anchor rod, namely, the strain of the force-measuring anchor rod is required, the grating is also subjected to strain, the maximum elongation of the force-measuring anchor rod is 17% and the maximum elongation of the fiber grating is 0.3%, once the strain of the force-measuring anchor rod is greater than 0.3%, the purpose of force measurement cannot be achieved, and the fiber grating can be damaged.
the existing fiber bragg grating force measurement anchor rod exists: the fiber bragg grating strain and the anchor rod strain are not easily coordinated in an effective range, namely the anchor rod strain is too large relative to the fiber bragg grating, so that the fiber bragg grating is broken or the measurement result is inaccurate.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides the coal mine tunnel roof stress on-line monitoring system and the monitoring method based on the fiber bragg grating sensor, which have the advantages of simple structure, convenience in installation, high reliability, high measurement precision, strong anti-electromagnetic interference capability, small environmental influence, no potential safety hazard, long signal transmission distance and capability of monitoring the tunnel roof stress in real time.
the technical scheme is as follows: the invention relates to a coal mine tunnel roof stress on-line monitoring system based on a fiber bragg grating sensor, which comprises monitoring stations arranged on tunnel roofs on two sides of a coal face, wherein the monitoring stations are mutually connected in series until reaching a goaf;
The roof stress monitoring device comprises a hollow anchor rod, wherein two ends of the hollow anchor rod are respectively provided with a fastened hollow bolt, a steel wire rope is arranged in the hollow anchor rod, the steel wire rope is fixed on the hollow anchor rod after being stretched by the hollow bolts at the two ends of the anchor rod, the bolt part of the hollow bolt is provided with two symmetrical grooves, the head part of the hollow bolt is provided with two optical fiber guide holes corresponding to the grooves, an optical fiber grating sensor is arranged in the groove of the hollow bolt, an optical fiber is led out from the tail end of the optical fiber grating sensor through an optical fiber lead-out hole, and the two optical fiber grating sensors are symmetrically;
each fiber grating sensor is connected with a fiber termination box through a communication fiber, and the fiber termination box is connected with an aboveground fiber grating demodulator through a mine transmission optical cable.
The length of the hollow anchor rod is 2000mm, and the diameter of the hollow anchor rod is 25 mm.
the diameter of the inner hole of the hollow bolt is 6mm, the diameter of the outer surface of the hollow bolt is 10mm, the length of the inner hole is 40mm, and the diameter of the head of the hollow bolt is 25mm and the length of the head of the hollow bolt is 10 mm.
the roof stress monitoring devices are arranged at intervals, one roof stress monitoring device is arranged on the roof every 50 meters, and two fiber bragg grating sensors are arranged on each roof stress monitoring device.
A coal mine tunnel roof stress online detection method based on a fiber grating sensor comprises the following steps:
a. installing a roof stress monitoring device: tightly attaching the fiber bragg grating sensor to the groove of the hollow bolt, leading out the optical fiber through the optical fiber leading-out hole, then tightly buckling the two hollow bolts at the two ends of the hollow anchor rod, straightening the thin steel wire rope to penetrate through the whole hollow anchor rod, and finishing the roof stress monitoring device;
b. arranging monitoring stations in a roadway, arranging 3 roof stress monitoring devices at intervals on roofs in the monitoring stations, wherein the interval distance of the roof stress monitoring devices is 50 meters, connecting fiber bragg grating sensors in the roof stress monitoring devices in series through fiber pigtails, advancing along the roadway, and arranging the next monitoring station when the interval distance of the monitoring stations is 20 meters until the set number of the monitoring stations is finished;
c. the optical fiber pigtail is connected with the optical fiber terminal box by using a communication optical fiber and is connected to an optical fiber grating static demodulator on the ground through a mine transmission optical cable, and the optical fiber grating static demodulator is connected with a monitoring computer;
d. When a top plate of a roadway at a certain position sinks and the stress of the top plate changes, an anchor rod body of the top plate stress monitoring device is subjected to tensile deformation, and because a thin steel wire rope in the top plate stress monitoring device is fixed at two ends through hollow bolts at two ends, the thin steel wire rope in the anchor rod body is pulled more tightly due to the tensile deformation of the anchor rod body, so that the hollow bolt at the end adhered with the fiber grating sensor is subjected to compression deformation, and then the fiber grating sensor adhered to the hollow bolt can generate a light wave signal subjected to shrinkage deformation;
e. If the thin steel wire rope deforms, the steel wire rope does not need to be replaced, if the thin steel wire rope breaks, the steel wire rope needs to be replaced or a new roof stress monitoring device needs to be replaced, the stress of the roadway roof which is out of layer or sinks and deforms is detected at any position in the vertical direction, and the monitoring and early warning effects are achieved by comparing the detected data with pre-stored dangerous critical data.
e. Transmitting a light wave signal acquired by a fiber bragg grating sensor to a fiber bragg grating static demodulator through an optical fiber and an optical cable, demodulating the light wave signal into a digital signal through the fiber bragg grating static demodulator, transmitting the digital signal to a monitoring computer, processing data through online monitoring software installed on the monitoring computer, and comparing the detected data with pre-stored dangerous critical data to display roadway roof stress data and a change trend in real time;
f. And the monitored roadway roof stress data is shared through a coal mine local area network and a network server, so that the online real-time remote monitoring of the roadway roof stress is realized.
Has the advantages that: due to the adoption of the scheme, the method for monitoring the stress of the top plate by using the traditional tension grating force measuring device is changed, and the fiber grating is not easy to be broken by pulling, the measurement precision is high, and the service life is long by using the monitoring method of the compression grating. The coal mine tunnel roof stress on-line monitoring system based on the fiber bragg grating sensor overcomes the defects in the design of the conventional device, is large in transmission capacity, wide in transmission range, good in anti-electromagnetic interference performance, convenient to install and high in measurement precision, can realize large-range long-term on-line real-time monitoring, and has practical significance for real-time monitoring of roof stress. Compared with the prior art, the method has the following advantages:
The invention overcomes the defects of the prior fiber bragg grating force-measuring anchor rod: the fiber bragg grating strain and the anchor rod strain are not easy to coordinate in an effective range, namely the anchor rod strain is too large relative to the fiber bragg grating, so that the fiber bragg grating is broken, and the measurement result is inaccurate. The method for monitoring the stress of the top plate by using the traditional tension grating type force measuring device is changed, a compression grating type monitoring method is adopted, when a roadway top plate at a certain position sinks, after the stress of the top plate changes, the anchor rod body of the top plate stress monitoring device is subjected to tensile deformation, and because the thin steel wire rope in the top plate stress monitoring device is fixed at two ends through the hollow bolts at two ends, the steel wire rope in the anchor rod body is pulled to be tighter through the tensile deformation, so that the hollow bolt at the end pasted with the fiber grating sensor also causes the compression deformation, and then the fiber grating sensor pasted on the hollow bolt can generate a light wave signal subjected to shrinkage deformation. The compressed grating type monitoring device ensures that the fiber grating cannot be broken, and has high measurement precision and long service life. The invention changes the defects of the prior device in design, and the adopted fiber bragg grating on-line monitoring system has the advantages of large transmission capacity, wide transmission range, good electromagnetic interference resistance, convenient installation, high measurement precision, realization of large-range long-term on-line real-time monitoring, practical significance for real-time monitoring of roof stress, adaptation to the safe and efficient production of the prior coal mine, satisfaction of the underground safety requirements of the coal mine and promotion of scientific research work.
Drawings
fig. 1 is a schematic view of the overall arrangement structure of the tunnel roof stress monitoring system of the present invention.
Fig. 2 is a cross-sectional view of a single fiber grating sensor-based coal mine tunnel roof stress online monitoring device of the invention.
Fig. 3(a) is a structure diagram of a bolt component of the single fiber bragg grating sensor-based coal mine tunnel roof stress online monitoring device.
fig. 3(b) is a left side view of fig. 3 (a).
In the figure: 1-fiber grating static demodulator; 2-monitoring the computer; 3-a network server; 4-coal mine local area network; 5-a client; 6-mining transmission optical cable; 7-fiber optic terminal closure; 8-communication optical fiber; 9-coal face; 10-roof stress monitoring means; 11-monitoring the station; 12-a goaf; 13-a hollow bolt; 14-thin wire rope; 15-hollow anchor rod; 16-a fiber grating sensor; 17-fiber lead-out hole; 19-hollow bore of bolt.
Detailed Description
an embodiment of the invention is further described below with reference to the accompanying drawings:
coal mine tunnel roof stress on-line monitoring system based on fiber grating sensor, its characterized in that: the monitoring and monitoring system comprises monitoring stations 11 arranged on roadway roofs on two sides of a coal face 9, the monitoring stations 11 are mutually connected in series to a goaf 12, each monitoring station 11 comprises three roof stress monitoring devices 10, the roof stress monitoring devices 10 in each monitoring station 11 are connected in series through communication optical fibers 8, an optical fiber pigtail at a leading-out end of the monitoring station 11 at the tail end of each roadway is connected with an optical fiber terminal box 7 through the communication optical fibers, the optical fiber terminal box 7 is connected with an optical fiber grating static demodulator 1 arranged on the ground surface through a mining transmission optical cable 6, the optical fiber grating static demodulator 1 is sequentially connected with a monitoring computer 2 and a network server 3, and the network server 3 is connected with a plurality of clients 5 through a coal mine local area network 4;
The roof stress monitoring device 10 comprises a hollow anchor rod 15, the length of the hollow anchor rod 15 is 2000mm, the diameter of the hollow anchor rod 15 is 25mm, two ends of the hollow anchor rod 15 are respectively provided with a fastened hollow bolt 13, the hollow diameter of the hollow bolt 13 is 6mm, the diameter of the screw is 10mm, the length of the screw is 40mm, the diameter of the head of the bolt is 25mm, the length of the bolt is 10mm, a steel wire rope 14 is arranged in the hollow anchor rod 15, the steel wire rope 14 is fixed on the hollow anchor rod 15 after being stretched by the hollow bolt 13 at two ends of the anchor rod, two symmetrical grooves are arranged on the bolt part of the hollow bolt 13, two optical fiber leading-out holes 17 are formed in the head of the hollow bolt 13 corresponding to the grooves, an optical fiber grating sensor 16 is arranged in the groove of the hollow bolt 13, optical fibers are led out from the tail end of the optical fiber grating sensor 16 through the optical fiber leading-out holes 17, and two optical;
Each fiber grating sensor 16 is connected with a fiber termination box 7 through a communication fiber 8, and the fiber termination box is connected with the fiber grating demodulator 1 on the well through a mining transmission optical cable 6 through the fiber termination box 7.
the roof stress monitoring devices 10 are arranged at intervals, one roof stress monitoring device 10 is arranged on the roof every 50 meters, and two fiber bragg grating sensors 17 are arranged on each roof stress monitoring device 10.
A coal mine tunnel roof stress online detection method based on a fiber grating sensor comprises the following specific steps:
a. installing a roof stress monitoring device: tightly attaching the fiber bragg grating sensor 16 to the groove of the hollow bolt 13, leading out an optical fiber through an optical fiber leading-out hole 17, then tightly fastening the two hollow bolts 13 at two ends of the hollow anchor rod 15, straightening the thin steel wire rope 14 to penetrate through the whole hollow anchor rod 15, and completing the roof stress monitoring device;
b. Arranging monitoring stations in a roadway, arranging 3 roof stress monitoring devices 10 on a roof in the monitoring stations at intervals, wherein the interval distance of the roof stress monitoring devices 10 is 50 m, connecting fiber bragg grating sensors 16 in the roof stress monitoring devices 10 in series through fiber pigtails, advancing along the roadway, and arranging the next monitoring station when the interval distance of the monitoring stations 11 is 20 m until the set number of the monitoring stations is finished;
c. the optical fiber pigtail is connected with an optical fiber terminal box 7 by using a communication optical fiber and is connected to an optical fiber grating static demodulator 1 on the ground by a mine transmission optical cable 6, and the optical fiber grating static demodulator 1 is connected with a monitoring computer 2;
d. When a top plate of a roadway at a certain position sinks and the stress of the top plate changes, the anchor rod body of the top plate stress monitoring device 10 is subjected to tensile deformation, and because the thin steel wire ropes 14 in the top plate stress monitoring device 10 are fixed at two ends through the hollow bolts 13 at two ends, the thin steel wire ropes 14 in the anchor rod body are pulled more tightly by the tensile deformation of the anchor rod body, so that the hollow bolts 13 at the end adhered with the fiber grating sensor 16 are subjected to compression deformation, and then the fiber grating sensor 16 adhered to the hollow bolts 13 can generate light wave signals subjected to shrinkage deformation;
e. if the thin steel wire rope 14 deforms, the steel wire rope 14 does not need to be replaced, if the thin steel wire rope breaks, the steel wire rope 14 needs to be replaced or a new roof stress monitoring device 10 needs to be replaced, the stress of the roadway roof which deforms in a separation or sinking mode at any position in the vertical direction is detected, and the effect of monitoring and early warning is achieved by comparing the detected data with pre-stored dangerous critical data.
e. transmitting the light wave signal collected by the fiber grating sensor 16 to the fiber grating static demodulator 7 through an optical fiber and an optical cable, demodulating the light wave signal into a digital signal through the fiber grating static demodulator 7, then transmitting the digital signal to the monitoring computer 2, processing the data through online monitoring software installed on the monitoring computer, and comparing the detected data with pre-stored dangerous critical data to display the stress data and the variation trend of the tunnel roof in real time;
f. and the monitored roadway roof stress data is shared through a coal mine local area network and a network server, so that the online real-time remote monitoring of the roadway roof stress is realized.
example 1: the utility model provides a colliery tunnel roof stress on-line monitoring equipment based on fiber grating sensor, rationally lay monitoring station quantity in the district's lane, 3 tunnel roof stress on-line monitoring equipment 10 are arranged at monitoring station 11 intervals, the spacing distance is 50 meters, the fiber pigtail of the leading-out terminal of fiber grating sensor 10 is connected with communication optic fibre 8, connect communication optic fibre with mining transmission optical cable 6 through fiber termination box 7, mining transmission optical cable 6 is connected with the input of fiber grating static demodulation appearance 1, the output of fiber grating static demodulation appearance 1 is connected with supervisory control computer 2, supervisory control computer 2 carries out data sharing through network server 3, colliery LAN 4 and customer end 5, form colliery tunnel roof stress full optical fiber communication's on-line monitoring system.
a coal mine tunnel roof stress on-line monitoring method based on a fiber grating sensor comprises the following steps:
a. tightly attaching the fiber bragg grating sensor to a small groove of a hollow bolt, leading out an optical fiber through an optical fiber leading-out hole, then tightly buckling the two bolts at the two ends of the hollow anchor rod, straightening by using a thin steel wire rope to penetrate through the whole device, and fixing the two ends of the steel wire rope, thus completing the roof stress monitoring device;
b. Firstly, a monitoring station is arranged in a roadway, 3 roof stress monitoring devices are arranged on a roof in the monitoring station at intervals, the interval distance is 50 m, fiber bragg grating sensors on the roof stress monitoring devices in the monitoring station are connected in series through fiber pigtails and are pushed forwards along the roadway, and the next monitoring station is arranged when the interval distance is 20 m until the set number of the monitoring stations is finished;
c. Two communication optical fibers are distributed to two ends of the roadway and are connected with the leading-out end optical fiber pigtail of the fiber bragg grating sensor in the monitoring station;
d. all fiber bragg grating roof stress sensors are installed, namely, the fiber bragg grating roof stress sensors enter a working state, and the stress change of the roadway roof is monitored;
e. transmitting a light wave signal acquired by a fiber bragg grating temperature sensor to a fiber bragg grating static demodulator through an optical fiber and an optical cable, demodulating the light wave signal into a digital signal through the fiber bragg grating static demodulator, transmitting the digital signal to a monitoring computer, performing data processing through analysis processing software installed on the monitoring computer, and displaying tunnel roof stress data and a variation trend in real time;
f. And the monitored roadway roof stress data is shared through a coal mine local area network and a network server, so that the online real-time remote monitoring of the roadway roof stress is realized.
Claims (4)
1. A coal mine tunnel roof stress on-line monitoring system detection method based on fiber grating sensors, the monitoring system used comprises monitoring stations (11) arranged on the tunnel roofs on both sides of a coal face (9), the monitoring stations (11) are mutually connected in series to a goaf (12), each monitoring station (11) comprises three roof stress monitoring devices (10), the roof stress monitoring devices (10) in each monitoring station (11) are connected in series through communication optical fibers (8), the leading-out end fiber pigtails of the monitoring stations (11) at the tail end of each tunnel are connected with an optical fiber terminal box (7) through the communication optical fibers, the optical fiber terminal box (7) is connected with a fiber grating static demodulator (1) arranged on the ground surface through a mining transmission optical cable (6), the fiber grating static demodulator (1) is sequentially connected with a monitoring computer (2) and a network server (3), the network server (3) is connected with a plurality of clients (5) through a coal mine local area network (4);
The roof stress monitoring device (10) comprises a hollow anchor rod (15), two ends of the hollow anchor rod (15) are respectively provided with a fastened hollow bolt (13), a thin steel wire rope (14) is arranged in the hollow anchor rod (15), the thin steel wire rope (14) is fixed on the hollow anchor rod (15) after being stretched through the hollow bolts (13) at the two ends of the hollow anchor rod (15), two symmetrical grooves are formed in the bolt part of the hollow bolt (13), two optical fiber leading-out holes (17) are formed in the head part of the hollow bolt (13) corresponding to the grooves, an optical fiber grating sensor (16) is arranged in the groove of the hollow bolt (13), an optical fiber is led out from the tail end of the optical fiber grating sensor (16) through the optical fiber leading-out holes (17), and the two optical fiber grating sensors (16) are symmetrically arranged; each fiber grating sensor (16) is connected with a fiber termination box (7) through a communication fiber (8), and the fiber termination box (7) is connected with an aboveground fiber grating static demodulator (1) through a mining transmission optical cable (6);
the method comprises the following specific steps:
a. Installing a top plate stress monitoring device, tightly attaching a fiber bragg grating sensor (16) to a groove of a hollow bolt (13), leading out an optical fiber through an optical fiber leading-out hole (17), then tightly buckling two hollow bolts (13) at two ends of a hollow anchor rod (15), straightening a thin steel wire rope (14) to penetrate through the whole hollow anchor rod (15), and completing the top plate stress monitoring device;
b. Arranging monitoring stations in a roadway, arranging 3 roof stress monitoring devices (10) on a roof in the monitoring stations at intervals, wherein the interval distance of the roof stress monitoring devices (10) is 50 meters, connecting fiber bragg grating sensors (16) in the roof stress monitoring devices (10) in series through fiber pigtails, advancing along the roadway, and arranging the next monitoring station when the interval distance of the monitoring stations (11) is 20 meters until the set number of the monitoring stations is finished;
c. the optical fiber pigtail is connected with an optical fiber terminal box (7) by using a communication optical fiber and is connected to an optical fiber grating static demodulator (1) on the ground through a mining transmission optical cable (6), and the optical fiber grating static demodulator (1) is connected with a monitoring computer (2);
d. when a roadway roof at a certain position sinks and the roof stress changes, the rod body of a hollow anchor rod (15) of the roof stress monitoring device (10) is subjected to tensile deformation, and because a thin steel wire rope (14) in the roof stress monitoring device (10) is fixed at two ends through hollow bolts (13) at two ends, the thin steel wire rope (14) in the hollow anchor rod (15) is pulled to be tighter by the tensile deformation of the rod body of the hollow anchor rod (15), so that the hollow bolt (13) at the end adhered with the fiber grating sensor (16) is subjected to compression deformation, and then the fiber grating sensor (16) adhered to the hollow bolt (13) can generate a light wave signal subjected to shrinkage deformation;
e. If the thin steel wire rope (14) deforms, the thin steel wire rope (14) does not need to be replaced, if the thin steel wire rope breaks, the thin steel wire rope (14) needs to be replaced or a new roof stress monitoring device (10) needs to be replaced, the stress of the roadway roof which is out of layer or sinks and deforms at any position in the vertical direction is detected, and the detected data is compared with pre-stored critical danger data to achieve the effect of monitoring and early warning;
f. transmitting a light wave signal acquired by a fiber grating sensor (16) to a fiber grating static demodulator (1) through an optical fiber and an optical cable, demodulating the light wave signal into a digital signal through the fiber grating static demodulator (1), transmitting the digital signal to a monitoring computer (2), processing the data through online monitoring software installed on the monitoring computer, and comparing the detected data with pre-stored dangerous critical data to display roadway roof stress data and a variation trend in real time;
g. And the monitored roadway roof stress data is shared through a coal mine local area network and a network server, so that the online real-time remote monitoring of the roadway roof stress is realized.
2. The detection method of the fiber grating sensor-based coal mine tunnel roof stress online monitoring system according to claim 1, characterized in that: the hollow anchor rod (15) is 2000mm in length and 25mm in diameter.
3. the detection method of the fiber grating sensor-based coal mine tunnel roof stress online monitoring system according to claim 1, characterized in that: the diameter of an inner hole of the hollow bolt (13) is 6mm, the diameter of the outer surface of the hollow bolt is 10mm, the length of the inner hole is 40mm, and the diameter of the head of the hollow bolt is 25mm and the length of the head of the hollow bolt is 10 mm.
4. the detection method of the fiber grating sensor-based coal mine tunnel roof stress online monitoring system according to claim 1, characterized in that: the roof stress monitoring devices (10) are arranged at intervals, one roof stress monitoring device (10) is arranged on the roof every 50 meters, and two fiber bragg grating sensors (16) are arranged on each roof stress monitoring device (10).
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| CN201710561839.6A CN107328503B (en) | 2017-07-11 | 2017-07-11 | coal mine tunnel roof stress on-line monitoring system and method based on fiber bragg grating sensor |
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| CN201710561839.6A CN107328503B (en) | 2017-07-11 | 2017-07-11 | coal mine tunnel roof stress on-line monitoring system and method based on fiber bragg grating sensor |
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| CN107328503B true CN107328503B (en) | 2019-12-06 |
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| CN204007960U (en) * | 2014-07-23 | 2014-12-10 | 上海市建筑科学研究院 | A kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor |
| CN105403337B (en) * | 2015-11-02 | 2018-11-06 | 武汉理工大学 | A kind of fiber grating bolt stress sensor with pre-stretching device |
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