System for monitoring gob stress in real time and overlying strata breakage judgment method

Abstract

The invention discloses a system for monitoring gob stress in real time and an overlying strata breakage judgment method. According to the system, a hydraulic sleeper is buried in each stress measuring point and is connected with a pressure sensor; the pressure sensor is connected with a wireless sensing transmitting module; a gob stress signal is transmitted through the wireless sensing transmitting module; a wireless receiving module is arranged in a mining roadway, can simultaneously receive multi-path stress radio signals transmitted in a gob and is connected with an electro-optic conversion module; the electro-optic conversion module converts multi-path stress electric signals into optical signals and transmits the optical signals to the ground through an optical fiber; an optical fiber signal is converted into an electric signal through the electro-optic conversion module, and the electric signal is connected with a monitoring host; the gob stress data are controlled, stored and displayed on line in real time on the monitoring host through configuration control software; and after a gob stress value obtained through monitoring is compared with a theoretically calculated stress value, an overlying strata breakage position above the stress measuring points is judged.

Description

technical field [0001] The invention relates to a real-time monitoring system for goaf stress and a method for judging overburden fracture, which is suitable for real-time monitoring of stress changes in the goaf behind the mining face as the roof falls behind, and combines the stress values ​​obtained through monitoring with theoretical calculations. After comparing the stress values ​​of the goaf, the overlying rock breaking position above the goaf can be judged. Background technique [0002] With the continuous increase of coal mining depth, the underground stress environment has changed greatly, resulting in more and more serious disasters such as large deformation of the roadway, rock burst, coal and gas outburst, and water inrush. All mine stress phenomena are caused by roadway excavation, stress redistribution after coal mining, and damage and movement of rock mass structure. Only by fully understanding the distribution characteristics and evolution rules of the stre...

AI Technical Summary

Problems solved by technology

[0005] At present, the borehole stress gauge is mainly used to monitor the leading support stress of the working face, while the monitoring of the goaf stress is still less

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