Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway

Abstract

The invention discloses a distributed optical fiber grating anchor rod group stress monitoring system for a coal mine roadway, and belongs to anchor rod group stress monitoring systems for coal mine roadways. Each of a mining roadway anchor rod support stress monitoring subsystem, an excavation roadway anchor rod support stress monitoring subsystem and a working face open-off cut anchor rod support stress monitoring subsystem comprises one or more monitoring substations; the communication optical fibers of the three subsystems are connected with a mineral transmission optical cable through an optical fiber connecting box; the mineral transmission optical cable is connected with an input port of an optical fiber grating static demodulator; an output port of the optical fiber grating static demodulator is connected with a computer data processing system; processed monitoring data is shared with a ground computer through a server and a coal mine local area network, so that the online real-time anchor rod group stress monitoring system for the coal mine roadway is formed. An anchor rod group stress monitoring network taking anchor rods as sensing media and optical fibers as transmission carriers adopts a tandem structure; the anchor group stress is measured in a distributed way; the mounting operation is convenient; the labor, the time and the effort are saved; the monitoring expense is reduced.

Description

technical field [0001] The invention relates to a stress monitoring system for bolt groups in coal mine roadways, in particular to a stress monitoring system for distributed optical fiber grating bolt groups in coal mine roadways. Background technique: [0002] In recent years, with the continuous improvement of mining technology, my country's coal mining industry has developed better and faster. As the basis for the development of other industrial sectors in our country, the safe production of coal mines plays a very important role in the social progress and the improvement of the national economy. However, as the mining depth of coal mines continues to increase, the mine pressure in coal mines becomes more obvious, and the disasters caused are becoming more and more serious, such as roof caving, roadway deformation, impact mine pressure and other accidents. An important factor in safe production, it seriously threatens the production safety of coal mines and the safety of...

AI Technical Summary

Problems solved by technology

At present, the force monitoring of anchor bolts is carried out on a single anchor bolt, and the monitoring methods are mostly resistance strain gauge force-measuring anchor bolts and hydraulic anchor bolt dynamometers. distribution, but it cannot reflect the coupling relationship between adjacent bolt groups and surrounding rocks. Moreover, manual intermittent observation and collection are used, and the monitoring results lag behind and the obtained data have large errors. Electromagnetic interference; Moreover, the length of coal mine roadways is long, and the force monitoring of a single bolt has a large workload and is inconvenient to operate. It is time-consuming and uneconomical. difficulty

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