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

Abstract

The present invention relates to a system for dynamically monitoring roadway roof separation based on a fibre grating and a pre-warning method, which belongs to the field of mine safety monitoring. Three parts, i.e., a ground data processing and control sub-system, a downhole data transmission communication sub-system and a downhole sensing data collecting sub-system are comprised: the ground data processing and control sub-system is placed in a ground control centre room, and is composed of a ground upper master monitoring computer, a fibre grating demodulation apparatus and a power supply; the downhole data transmission communication sub-system is composed of a mining transmission fibre and a fibre junction box; and the downhole sensing data collecting sub-system comprises at least one apparatus for monitoring fibre grating roof separation. The real-time online dynamic consecutive measurement of roof separation is realized, a transformation circumstance of a roadway surrounding rock is obtained, and the rationality of a bolting support parameter is verified. Once the pre-warning threshold of separation is exceeded, a pre-warning signal can be sent correctly, so that measures can be taken in time, and roof collapse can be prevented, which is of great importance for the outer roof separation size and the roadway stability in an anchorage zone.

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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