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EH4电磁法是大地电磁测深技术之一,它利用天然或人工电磁场的测量,求取地下介质电阻率的分布规律,进而达到解决工程建设中的有关问题,如地下岩性分带、地层划分、断层破碎带探测、地下采空区等工程地质问题,现已在许多领域得到应用,并取得了良好的应用效果。文中介绍了EH4电磁测深技术的基本原理、测试技术及资料处理和成果分析等。最后给出了EH4电磁测深法勘察的一个实例并总结了该方法的几个探测优势。
EH4 electromagnetic method is one of the earth’s electromagnetic sounding technology, which uses the measurement of natural or artificial electromagnetic field, to find the distribution law of the resistivity of underground medium, and then to solve the problems related to the construction of the project, such as underground lithology zoning, stratigraphic division , Fault fracture zone exploration, underground goaf and other engineering geological problems, has been applied in many fields, and achieved good results. This paper introduces the basic principles of EH4 electromagnetic sounding technology, test technology and data processing and results analysis. Finally, an example of EH4 electromagnetic sounding survey is given and several detection advantages of this method are summarized.