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In-hole direct current electric method advanced detection method

A technology of advanced detection and direct current method, applied in the field of geophysical exploration, can solve the problems of short forecast distance and insufficient accuracy, and achieve the effect of increasing the signal-to-noise ratio and improving the resolution ability.

Inactive Publication Date: 2014-08-27
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

In this case, the application of the above method for advanced forecasting will result in the defects of short single forecast distance and insufficient accuracy

Method used

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specific Embodiment approach

[0036] refer to figure 1 , although the description is based on the example of the coal mine's advance detection of geological anomalies along the coal seam, it should be noted that this description is only exemplary, and the present invention is not limited to the scheme of advance detection of geological anomalies along the coal seam. Generally speaking, the specific implementation manner of the present invention comprises the following steps:

[0037] (1) In front of the head 4 of the roadway 2 that needs to be detected in advance, drill holes 7 along the coal seam 6 according to requirements along the driving direction, and the drilling depth can be determined according to the detection requirements. The requirements for the boreholes are as follows:

[0038] (a) Perpendicular to the head, drill holes along the layer;

[0039] (b) The hole depth can be 100-300m or deeper according to the detection requirements;

[0040] (2) Arrange the power supply electrodes 8 (A1, A2 a...

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Abstract

The invention relates to a direct current electric method advanced detection method. Influences of adverse factors in a rear area can be effectively avoided, the signal-to-noise ratio and the resolution capacity to anomalous bodies in stratum media on the periphery of a hole are improved, the detection accuracy rate is improved, current electrodes are fixed behind a roadway construction facing head, steady currents are provided for stratums, a point power source field is built, a change rule of the point power source field is observed along the interior of the stratum drilled hole in front of the facing head, and hidden disaster-caused bodies in front of the roadway construction position are detected. The direct current electric method advanced detection method relates to the multiple current electrodes arranged nearby the roadway construction facing head, a power supply system is formed by the current electrodes and an infinite electrode, and a receiving system composed of receiving electrodes is arranged in the drilled hole. The receiving electrodes are sequentially and movably distributed from a hole opening to the deep portion, potential differences generated when the three current electrodes respectively supply power are received when the receiving electrodes move one time, and the apparent resistivity at the corresponding position can be calculated. The potential differences and the calculated apparent resistivity serve as essential data, the three sets of data are jointly processed, and data bodies capable of being used for geological interpretations are obtained.

Description

technical field [0001] The invention belongs to the technical field of geophysical prospecting, and relates to a direct current method advanced detection method applied in drilling to detect hidden disaster-causing bodies ahead of roadway excavation. Background technique [0002] In the field of geophysical exploration technology, a reliable advance prediction method is usually required to meet the needs of safe excavation in related industries. In-hole direct current detection is a new advance prediction method, which can accurately identify water-containing / conducting bodies within a certain radial distance around the borehole. [0003] The prediction of disastrous geological anomalies and water-bearing / water-conducting bodies ahead of roadway and tunnel excavation is an important task closely related to safe production. At present, the main advanced detection methods include seismic reflection wave method, Rayleigh wave method, geological radar method, transient electrom...

Claims

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Application Information

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IPC IPC(8): G01V3/02
Inventor 侯彦威王鹏王信文张振勇李文刚蒋齐平司银女
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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