A secondary time-difference method for early detection of water-bearing structures along the bedding in coal mine roadways

Abstract

The invention relates to a secondary time-difference method for detecting water-bearing structures in advance along the bedding in coal mine roadways. In the present invention, an AMN∞B electrical three-pole measuring device is arranged near the tunneling head of the coal mine. The power supply electrode A and the measurement electrode MN form a straight line arrangement, and A and another power supply electrode B arranged at infinity form a loop, and press a certain pressure to the underground. According to the current system, two excitation currents, large and small, are supplied successively to establish an artificial electric field. At the same time, two electrodes M and N with a relatively fixed distance are used to measure the distribution of the electric field at the back of the roadway. After processing through special supporting interpretation technology, the interpretation is The distribution information of the relative size of the structural water content in front of the excavation working face. The present invention can detect the location of the geological structure and the relative water content within a long distance in front of the working face of the excavation roadway along the bedding, and will not miss the disastrous water-conducting water-bearing structure, reducing the number of harmless geophysical abnormalities and the amount of drilling. It can increase the speed of coal mine excavation.

Description

technical field [0001] The invention relates to a method for detecting water-bearing structures, which belongs to the technical field of advanced detection in coal mines, in particular to a secondary time-difference method for detecting water-bearing structures in advance along bedding in coal mine roadways. Background technique [0002] The prediction of disastrous geological bodies and water-bearing bodies ahead of roadway and tunnel excavation is an important task closely related to safe production. At present, the commonly used advanced detection technologies include direct current method, seismic reflection wave method, Rayleigh wave method, geological radar method, transient electromagnetic method, infrared temperature measurement method, and a kind of forecasting tunnel construction method described in the patent application number 200810044794.6. The method of water gushing position in front of the front, the electric field restraint method described in the patent ap...

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Problems solved by technology

[0007] In order to solve the problem that the current advanced detection method of coal mine roadway excavation can only detect the abnormal position of low resistance, but cannot predict the relative water conductivity, etc., the present invention proposes a method for advanced time difference detection of bedding water-bearing structure in coal mine roadway

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