Method for monitoring destroying depth of mining working face base plate in real time

Abstract

The invention belongs to the technical fields of mine water prevention and control and mine physical geography and relates to a method for monitoring the destroying depth of a mining working face base plate in real time. An electrical resistivity measurement and control mainframe is controlled to automatically acquire data through a multi-pole control converter, acquired data are transmitted through a communication cable in real time, existing underground three-dimensional electrical-method software is utilized to process and analyze the data, the change rule of base plate rock stratum electrical resistivity of the working face in the mining process is analyzed in real time, and real-time monitoring of the destroying depth of the mining working face base plate is achieved according to a destroying depth testing value of the base plate in a field. The method is simple, convenient top operate, accurate in measured data, short in working period, high in efficiency and capable of monitoring the destroying development depth of the base plate in the working face and is suitable for a large-mining-depth high-confined water under-pressure coal mining technology.

Description

Technical field: [0001] The invention belongs to the technical field of mine water prevention and mine geophysics, and relates to a measurement process for the damage depth of the bottom plate of a mining face, in particular to a real-time monitoring method for the damage depth of the bottom plate of a mining face. Background technique: [0002] In recent years, with the continuous deepening of coal seam mining, the geological structure and hydrogeology have become increasingly complex, and coal mining on large mining depth, large span, and high pressure water has brought forward new research methods for the prediction method of floor damage water inrush mechanism and the depth of floor damage in the working face. requirements. At present, the research on the depth of floor damage mainly includes empirical formulas, on-site detection values, theoretical formulas, numerical simulations, and similar material models. As the depth increases, there will be some deviations in the...

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Problems solved by technology

At present, the research on the depth of floor damage mainly includes empirical formulas, on-site detection values, theoretical formulas, numerical simulations, and similar material models. As the depth increases, there will be some deviations in the damage value of the floor depth; in terms of on-site detection, the depth of floor damage is generally realized by drilling water (liquid) and geophysical detection methods, and the drilling water (liquid) uses a double-end plugging side leakage device, according to Water injection (fluid) leakage is used to measure the depth of floor damage. Generally, the depth of floor damage is measured before mining or during the mining process. The measured value is the value of the floor damage at a certain moment, and the observed value lacks continuity; geophysical detection methods are general The DC resistance method is used for detection, and the DC method has the advantages of being less affected by the external environment and high construction efficiency.

At present, the DC resistance imaging technology is generally two-dimensional, which can only show the change law of the damage resistivity of the floor of the roadway, and is helpless for the change law of the resistivity change law of the floor damage depth in the working face; the underground three-dimensional resistivity imaging technology can show The resistivity map of the rock strata has the characteristics of visual image, but the downhole three-dimensional resistivity technology has a large amount of engineering work and a long working period, and cannot provide timely data on the development of the floor fracture depth of the mining face. Water inrush in goaf

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