Environmental disaster early warning system and early warning method of fully mechanized mining face based on random background excitation bolt array sensing

Abstract

The invention discloses an early warning system and an early warning method for an environmental disaster in a fully mechanized mining face based on a random background excitation bolt array sensor. Sensing device to form a bolt sensing array. Considering the bolt array as an electrode pair, the electrical conductivity distribution of the coal and rock field is calculated by the method of electrical resistance tomography, and the internal coal seam resistivity distribution image is reconstructed, combined with the coal and rock sound velocity distribution image formed by each bolt acoustic tomography, More accurate and efficient analysis and judgment can predict most geological accidents such as water seepage, roof fall, and landslides in the working face. Finally, the above data and results are uploaded to the cloud server through the wireless module for storage and can be viewed in real time on the WeChat official account. The invention overcomes the problem that the traditional method needs to be constructed under the condition of stopping production, and improves the flexibility and real-time performance of the system; the system has simple structure, convenient realization, and convenient use and operation.

Description

technical field [0001] The invention belongs to the technical field of dynamic monitoring of coal and rock near fully mechanized mining faces, and in particular relates to a fully mechanized mining face environmental disaster early warning system for random background excitation bolt array sensing. Background technique [0002] Studies have shown that before accidents such as roof fall, rock burst, coal and gas outburst, and water inrush occur in the fully mechanized mining face, the physical parameters of the coal and rock in front of the fully mechanized mining face will change to a certain extent. For example, in the Daxing Coal Mine in Xingning, Guangdong, when the lower coal was mined, the mining cracks expanded and destroyed the waterproof coal pillars left by the mining, resulting in a huge water inrush and 123 deaths. If the change of coal and rock physical parameters near the fully mechanized mining face before the accident can be sensed in real time during the mini...

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Problems solved by technology

However, the above methods all have the following two problems: (1) It is easy to be disturbed by the environment generated by the metal structure of the hydraulic support and the electromagnetic field of the fully mechanized mining electromechanical equipment

(2) It is necessary to carry out special detection construction under the static conditions of shutdown and quasi-stop production, which is time-consuming and laborious, and affects the construction progress

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