Tunnel roof separation dynamic monitoring system based on fiber bragg grating and early-warning method thereof

Abstract

The invention relates to a tunnel roof separation dynamic monitoring system based on fiber bragg grating and an early-warning method of the tunnel roof separation dynamic monitoring system, and belongs to the field of mine safety monitoring. The tunnel roof separation dynamic monitoring system comprises a ground data processing and controlling subsystem, an underground data transmission and communication subsystem, and an underground sensor data collecting subsystem, wherein the ground data processing and controlling subsystem is placed in a ground control center room, and comprises a ground superior main supervisory control computer, a fiber bragg grating demodulating device and a power supply; the underground data transmission and communication subsystem comprises a mining transmission optical fiber and an optical fiber junction box; the underground sensor data collecting subsystem comprises at least one fiber gragg grating roof separation monitoring device. The tunnel roof separation dynamic monitoring system realizes real-time online dynamic continuous measurement of the roof separation to obtain the deforming situation of the surrounding rock of the tunnel, detects the reasonability of rock bolting support parameters, and once the parameters excess the early-warning threshold values of the separation, emits accurate early-warning signals, so as to take measures in time and prevent collapse of roof. The tunnel roof separation dynamic monitoring system is of great significance in size of external and internal roof separations in the anchoring area and the stability of the tunnel.

Description

technical field [0001] The invention relates to a roadway roof detachment monitoring system and an early warning method, in particular to a roadway roof detachment dynamic monitoring system and an early warning method based on optical fiber gratings. Background technique [0002] In coal mine production, the roadway surrounding rock will be delaminated due to the tension and shear damage of external force, especially the roof delamination is more likely to occur in the roadway supported by bolts. Roof delamination is one of the main forms of deformation and failure of the roadway surrounding rock. When the roof delamination exceeds a certain range, it indicates that the roof is in an unstable state. If support measures are not taken in time, vicious roof accidents such as roof fall will occur. It is related to the personal safety of coal miners and the smooth progress of coal mine production. Therefore, for the roadway supported by bolts, the roof separation layer needs to ...

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Problems solved by technology

[0003] At present, the commonly used roof separation monitoring devices in my country's coal mines are mostly mechanical roadway roof separation indicators and roadway roof separation indicators that use electrical components to alarm in the form of sound and light. The existing roof separation monitoring systems are based on Zigbee The coal mine roof dynamic monitoring system based on CAN bus technology and the roof separation monitoring system based on the M-BUS bus, although these methods play a positive role in preventing roof caving, the above monitoring methods still have the following disadvantages: the monitoring devices are all manual It is inconvenient to observe and measure the status of the roof separation layer regularly, and it is inconvenient to read in the underground. At the same time, due to the limitation of the underground roadway conditions and light intensity, the reading error is relatively large; the monitoring system uses a single-chip microcomputer as the controller, the measurement accuracy is not high, and the anti-electromagnetic interference ability is not strong. , is greatly affected by the environment, the measurement range is small, and the reliability is low. The implementation effect of the dynamic and continuous monitoring of the roof detachment of the roadway is not good. At the same time, the occurrence of the roof detachment cannot be warned. Reliability makes a big difference

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