Transient electromagnetic method ground hole detection method and device

A technology of transient electromagnetic method and detection method, applied in the field of geophysical exploration, can solve problems such as large workload, and achieve the effect of high signal-to-noise ratio

Active Publication Date: 2014-08-20
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

The temperature test is carried out in rock holes with a depth of 5-12m, so a certain number of holes need to be drilled at equal intervals behind the tunnel, which has a relatively large workload

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  • Transient electromagnetic method ground hole detection method and device
  • Transient electromagnetic method ground hole detection method and device

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specific Embodiment approach

[0047] refer to figure 1 , although the description is based on the example of early detection of geological anomalies along coal seams, it should be noted that this description is only exemplary, and the present invention is not limited to the scheme of early detection of geological anomalies along coal seams. Generally speaking, the specific implementation manner of the present invention comprises the following steps:

[0048] (1) In the target formation that needs to be detected in the underground, the step of drilling along the bedding, specifically, in front of the head 11 of the roadway 10 that needs to be detected in advance, drills the drilling 12 along the coal seam 5 along the driving direction, and can be used according to the detection requirements. Drilling to 100m, 200m, 300m or deeper;

[0049] (2) Around the projection position on the ground 1 of the target stratum to be detected, use a measuring and fixed-point instrument to measure and fix the point, and the...

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Abstract

The invention relates to a transient electromagnetic ground hole detection method and device for detecting hidden objects to cause disasters, wherein a large transmitting loop surrounding a target stratum completely is arranged on the ground; electricity is supplied, so that a primary electromagnetic field is generated, and in a hole drilled along the stratum underground, a three-component secondary field around the hole is directly received. Transmitting is separated from receiving. Interference of local good electric conductors, industrial electromagnetic signals, periodic electric signals and the like on the ground can be avoided. Besides, the shielding influence of a low-resistivity layer or a low-resistivity mineralized zone on the surface of the stratum can be avoided. A receiving device is placed in the drilled hole so that a complex construction environment outside the hole can be avoided, for example, heading equipment, anchor rods, anchor nets, transportation equipment, industrial electricity and the like exist in a coal mine roadway.

Description

technical field [0001] The invention belongs to the technical field of geophysical prospecting, and relates to a large transmitting loop that is arranged on the ground and completely surrounds the target stratum. The primary electromagnetic field is generated by power supply, and the three-component secondary field around the hole is directly received in the underground drilling hole to detect hidden causes. A transient electromagnetic ground hole detection method and device for a disaster body. Background technique [0002] In the field of geophysical exploration technology, a reliable detection method is usually required to meet the needs of safe production in related industries. The transient electromagnetic ground hole detection method is a new prediction method applied to the detection of hidden disaster-causing bodies, which can accurately detect the surrounding areas in front of underground roadway excavation, as well as disaster geology within a certain distance in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/26
CPCG01V3/26
Inventor 王信文侯彦威王鹏王艳波覃庆炎代凤强李丹
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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