Direct current method for bed-parallel advanced detection of water bearing structure in mine tunnel

Abstract

The invention discloses a direct current method for bed-parallel advanced detection of water bearing structure in mine tunnel. Common advanced detection technology comprises a seismic reflection wave method, a Rayleigh wave method and the like, but with the extensive application of a fully-mechanized roadheader, the above methods are harder to adapt to the present production task requirements. The method of the invention is as follows: a mine direct current method seven-electrode series detecting device is used to arrange four current-emitting electrodes of A1, A2, A3 and A4 which are arranged on one straight line near a mine tunnel heading end, and the four current-emitting electrodes respectively form a loop with another current-emitting electrode B arranged at infinity to supply direct current under the ground, so that a direct current field is built; meanwhile, two electrodes M and N with relatively fixed distance behind the tunnel are used for measuring the distribution rule of the electric field; after treatment with special mating interpreting technology, electrical property distribution information in a geologic body 0-140m ahead a drifting tunnel or a tunnel is obtained. 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 coal mine roadway excavation geological advance prediction and forecasting, and specifically relates to a direct current 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. Currently commonly used advanced detection technologies include seismic reflection wave method, Rayleigh wave method, geological radar method, transient electromagnetic method, infrared temperature measurement method and a kind of prediction of water gushing in front of the tunnel construction face described in the patent application number 200810044794.6 location method. Tunnel seismic profiling (TSP) is widely used in seismic reflection wave method [1] and tunnel vertical seismic profiling (TUSP)...

AI Technical Summary

Problems solved by technology

[0017] In order to solve the shortcomings of the current advanced detection method for coal mine roadway excavation, the single detection distance is too short, and the "disastrous" water inrush geological structure cannot be effectively identified, there is no interpretation standard, the accuracy is not high, false positives and negative negatives, etc.

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