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

A technology for advanced detection and coal mine roadway, which is applied in the field of secondary time difference for advanced detection of water-bearing structures along the bedding in coal mine roadways. The effect of reducing the amount of drilling and reducing the number

Active Publication Date: 2020-06-09
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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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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  • A secondary time-difference method for early detection of water-bearing structures along the bedding in coal mine roadways
  • A secondary time-difference method for early detection of water-bearing structures along the bedding in coal mine roadways
  • A secondary time-difference method for early detection of water-bearing structures along the bedding in coal mine roadways

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Embodiment Construction

[0017] 1. Downhole construction method and detection principle

[0018] see figure 1 , using three sets of AMN∞B DC detection devices, that is, the six-electrode system (A 1 A 2 A 3 MN∞B) Secondary time-difference method bedding-advanced detection device, which measures the distribution of artificial electric field in the roadway behind the tunneling head, so as to predict the position and relative water volume of the geological structure in front of the tunneling head in advance. Because the resistivity value of the general rock formation drops sharply when the formation is water-containing, and in the aquifer layer with the increase of the excitation current, the attenuation also increases correspondingly, and in the non-aquifer layer with the increase of the excitation current, it basically remains unchanged or gradually decreases, so The method can identify the relative amount of water in front of the heading head.

[0019] A. Downhole construction method

[0020] Cre...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/04
CPCG01V3/04Y02A90/30
Inventor 韩德品王程李学潜鲁晶津冯宏吴正飞石学锋
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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