浅层岩溶瞬变电磁响应规律试验研究

doi:10.13722/j.cnki.jrme.2017.0038

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Abstract The characteristics of transient electromagnetic field in detecting shallow karst was studied focusing on the engineering and environmental problems caused by karst collapse. The shallow karst was generalized to be two types of geophysical models. The method of three dimensional finite difference in the time domain was used to simulate the transient electromagnetic responses. The resistivity，the karst size and the buried depth were selected as the comparison parameters. The numerically calculated differences of responses are bigger when the filled karst has the low resistivity and large size. The responses from the karst are mainly in the early stage. The transient electromagnetic field can identify nicely both the filled and half-filled shallow karsts. A field experiment was used to verify the numerical results in Guangxi. The transient electromagnetic profile revealed the known karst and found the unknown karst. The numerical and field experiments indicated that early observation and short time for turn off were better for small loop transient electromagnetic survey for shallow karst.

Key words： rock mechanics shallow karst transient electromagnetic response characteristics

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	Articles by authors
	SUN Huaifeng1
	WU Qilong1
	CHEN Rujun2
	LI Haiyan1
	FAN Qiuyan3
	LIU Gongjie4
	LIN Jiuqing4
	LI Shucai1
	LI Kai1
	SU Chuanxi1

Cite this article:

SUN Huaifeng1,WU Qilong1,CHEN Rujun2, et al. Experimental study on transient electromagnetic responses to shallow karst[J]. , 2018, 37(3): 652-661.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0038 OR http://www.rockmech.org/EN/Y2018/V37/I3/652

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