摘要
介绍了瞬变电磁法工作原理、特点及工作方法。瞬变电磁法对于施工区有较强的适应能力,工作效率较高。它对低阻充水断层、充泥充水溶洞等低电阻目标物敏感,岩溶含水岩组及断层破碎带的电阻率与其完整的围岩有明显的电性差异。所以主要用于探测含水层、溶洞、陷落柱、含水断层等地质构造情况。选用适当的装置可将瞬变电磁法应用于溶洞的探测,根据溶洞的瞬变电磁响应特征分析等视电阻率曲线的形态来确定溶洞的存在。瞬变电磁法的应用,可以很好地解决工程地质问题。
The paper introduces working principle and methods and the characteristics of transient electromagnetic technique,and presents working procedure of the techniques for locating karst or karst development zones in engineering sites of the case examples.The transient electromagnetic method is sensitive to the unfavorable geologic bodies filled with water or mud such as faults and caves and the efficiency is higher.With transient electromagnetic technique sensitive to detect targets with low resistivity,there is a clear electric difference between the resistivity of rock dissolvent contain water groups and fault breaking belt with its complete surround rock,for example,aquifers,karst,column collapse etc.Using the suitable apparatus the transient electromagnetic method could be used to prospect karst.The existence of underground cave is determined based on the shape of apparent resistivity curve analyzed by the characteristics of transient electromagnetic response of karst.It is effective to solve the engineering problem.
出处
《工程地球物理学报》
2011年第5期521-524,共4页
Chinese Journal of Engineering Geophysics
关键词
瞬变电磁法
溶洞
原理
异常
应用
transient electric magnetic technique
Karst
principle
abnormality
apply
