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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摘要针对浅层岩溶塌陷产生的工程与环境问题，研究瞬变电磁对浅层岩溶的响应规律。通过分析将浅层岩溶概化为充填与半充填两类地电模型，采用时域有限差分法进行三维正演计算，对比分析电性差异、规模差异以及埋深差异情况下的瞬变电磁衰减曲线特征和视电阻率曲线变化规律。通过数值试验发现：浅层岩溶充填物的电阻率越低、规模越大，瞬变电磁衰减曲线中的异常响应幅值越大；浅层岩溶的瞬变电磁异常响应主要集中在早期；瞬变电磁对具有一定规模的充填模型与半充填模型均有较好的识别能力。选择某已知区域进行现场试验，瞬变电磁能够圈定岩溶异常，并发现未揭露的潜在岩溶发育区。数值试验和现场试验表明，瞬变电磁探测浅层岩溶需要更早的观测时间和更小的关段时间。

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	孙怀凤1
	吴启龙1
	陈儒军2
	李海燕1
	范秋雁3
	刘功杰4
	林久卿4
	李术才1
	李凯1
	宿传玺1

关键词 ：岩石力学, 浅层岩溶, 瞬变电磁, 响应规律

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

引用本文:

孙怀凤1，吴启龙1，陈儒军2，李海燕1，范秋雁3，刘功杰4，林久卿4，李术才1，李凯1，宿传玺1. 浅层岩溶瞬变电磁响应规律试验研究[J]. 岩石力学与工程学报, 2018, 37(3): 652-661.
SUN Huaifeng1，WU Qilong1，CHEN Rujun2，LI Haiyan1，FAN Qiuyan3，LIU Gongjie4，LIN Jiuqing4，LI Shucai1，LI Kai1，SU Chuanxi1. Experimental study on transient electromagnetic responses to shallow karst. , 2018, 37(3): 652-661.

链接本文:

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

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