EH4电磁测深在煤层采空区勘察中的应用

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。

Application of EH4 electromagnetic sounding to detect coal mined-out area

The EH4 electromagnetic method is one technique of magnetotelluric(MT) system,it uses measuring both of natural and man-made electromagnetic signals to obtain the regularity of distribution of electrical resistivity of the earth beneath,and then solving the problems in engineering construction,it has been widely and effectively applied in many fields,such as measuring lithological zoning,stratigraphic division,fracture zone,underground mined area etc.in engineering geology.The basal principle,measuring technique,data processing and result analysis of EH4 electromagnetic sounding are introduced in the paper.In the meanwhile,it provides an example about engineering investigating,summarizes several advantages of EH4 electromagnetic sounding.