Evaluation on the resolution ability of underground transient electromagnetic instrument to disaster-causing water bodies

ZHAO Zhongnan; XU Yangcheng; WU Yanqing; TAN Qingqing; KANG Yueming; WANG Yao

doi:10.3969/j.issn.1001-1986.2021.04.006

Volume 49 Issue 4

Sep. 2021

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COAL GEOLOGY & EXPLORATION > 2021 > 49(4): 40-48. > DOI: 10.3969/j.issn.1001-1986.2021.04.006

ZHAO Zhongnan, XU Yangcheng, WU Yanqing, TAN Qingqing, KANG Yueming, WANG Yao. Evaluation on the resolution ability of underground transient electromagnetic instrument to disaster-causing water bodies[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(4): 40-48. DOI: 10.3969/j.issn.1001-1986.2021.04.006

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Evaluation on the resolution ability of underground transient electromagnetic instrument to disaster-causing water bodies

ZHAO Zhongnan^{1, 2,},
XU Yangcheng^{1, 2, ,},
WU Yanqing^{1, 2},
TAN Qingqing^{1, 2},
KANG Yueming^{1, 2},
WANG Yao³

1.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2.
School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
3.
College of Advanced Manufacturing Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

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Received Date: April 14, 2021
Revised Date: June 20, 2021
Available Online: September 09, 2021
Published Date: August 24, 2021

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Abstract

Abstract

The downhole transient electromagnetic detection technology is an effective method to detect the disaster-causing water body in front of the tunneling. It is an important means to evaluate the instrument's resolution ability to disaster-causing water from the aspect of hardware for the instrument to be used correctly in underground mines. By comparing the magnitude relationship between the absolute difference of the secondary field, the resolution of the instrument and the background noise after superposition, the hardware conditions and evaluation basis for distinguishing the water-bearing hazards are analyzed. A calculation method for evaluating the resolution ability of underground transient electromagnetic to disaster-causing water body from the aspect of hardware is put forward. A three-dimensional geological model is established based on the structure of the disaster-causing water body, and the relationship between the trapezoidal wave turn-off and the negative step wave turn-off secondary field induced voltage was deduced, and the full-space three-dimensional finite difference parallel was adopted on the GPU. The algorithm calculates the secondary field response of the disaster-causing water body. The turn-off time and background noise of a transient electromagnetic instrument are measured. According to the hardware discrimination basis of the disaster-causing water body, the ability of the underground transient electromagnetic instrument to distinguish water-conducting subsidence column and water-filled goaf was evaluated from the hardware aspect. The development of downhole transient electromagnetic detection instruments and accurate on-site detection provide technical reference, which is of great research significance.
- transient electromagnetic,
- disaster-causing water body,
- resolution ability,
- FDTD,
- parallel computing

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References

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