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《Chinese Journal of Rock Mechanics and Engineering》 2018-03
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Experimental study on transient electromagnetic responses to shallow karst

SUN Huaifeng;WU Qilong;CHEN Rujun;LI Haiyan;FAN Qiuyan;LIU Gongjie;LIN Jiuqing;LI Shucai;LI Kai;SU Chuanxi;Geotechnical and Structural Engineering Research Center,Shandong University;School of Info-physics and Geomatics Engineering,Central South University;College of Resources and Metallurgy,Guangxi University;China Resources Cement Holdings Limited;  
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.
【Fund】: 国家自然科学基金资助项目(41404104);; 国家重点基础研究发展计划(973)项目(2013CB036002);; 广西科技基地和人才专项(桂科AD17129047)~~
【CateGory Index】: TU45
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