Detection method of mine direct current method for coal face coal seam perspecitivity

Abstract

The invention discloses a detection method of mine direct current method for coal face coal seam perspecitivity. The mine direct current method is mainly used for detecting the depth of a tunnel floor and ahead water bearing structure in front, and can solve the problems of layer division and water-rich body delimitation. The method has a main problem that the width of a fully mechanized face is always more than 180m, and the buried structure in the fully mechanized face is hard to detect. The invention adopts a quadrupole AB-MN direct current method to detect device modes; in the detecting process, a current-emitting electrode A and a current-emitting electrode B are respectively fixed; electrodes M and N are moved to measure in another tunnel; sector scan measurement is carried out on two sides of an axle wire in the AB-MN shortest distance; according to the electric field distribution rule, an earth resistivity imaging method is used to calculate apparent resistivity in the face and the distribution rule of apparent resistivity rate, so that whether geologic structure exists in the face coal layer can be detected. The invention has the advantages of small workload, high speed, small possibility of influence by personal factors, high objectivity and high accuracy, and belongs to a non-destructive detection method.

Description

technical field [0001] The invention belongs to the technical field of geological detection of coal mining working faces in coal mines, and in particular relates to a mine direct current detection method for seeing through the coal mining working face along the coal seam, especially capable of detecting coal mining work with a large width and a working face width greater than 180m. The coal seam perspective method of the coal seam missing zone and the water-bearing and water-conducting geological structure inside the surface. Background technique [0002] There are many branching methods of mine direct current method, such as symmetrical quadrupole, monopole-dipole method and monopole-monopole method in terms of pole layout; bathymetry, profile method and perspective method in terms of observation methods, all of which are Based on the whole-space electric field distribution theory, study the abnormal field distribution characteristics caused by different electrical layers o...

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Problems solved by technology

[0021] In order to solve the problem that when the coal mining face is wide and the coal seam shields or absorbs high-frequency electromagnetic waves, it cannot effectively see through the coal mining face with a large width and a width greater than 180m. The present invention provides a mine that sees through the coal mining face along the coal seam Direct current detection method, which can avoid the shielding of artificial electric field by the coal seam, can see through the coal seam missing zone and water-bearing and water-conducting geological structure inside the coal mining face with a width of 180m ~ 400m, and predict the potential geological structure inside the coal seam of the coal mining face

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