摘要
高速公路隧道周围存在岩溶洞穴和断层构造等隐伏不良地质体的发育,对隧道施工存在巨大的安全隐患。EH-4具有不受高阻屏蔽、精度高、探测深度大等特点。本文介绍了EH-4成像系统的原理;根据高速公路隧道周围不良地质体的特点,研究了EH-4的几个关键技术"平行试验、探头和电极布设技术、静态效应和近源效应"在勘察中产生的影响。通过杭新景高速公路芹源岭隧道的应用实例,分析总结了该方法在高速公路深埋隧道勘察中的可行性和有效性。
Karst caverns,fault structures and other unfavorable geologic body around the expressways pose a great threat to the safety of expressway tunnel construction.EH-4are unshielded by high resistivity layers with high precision and large penetrating depth.This paper describes principle of EH-4electromagnetic imaging system based on the characteristics of unfavorable geologic,and the influences of some key techniques of EH-4,parallel experiments,the layout of prove and electrode,static effects and source effect on the exploration are investigated.Taking the investigation of the expressway tunnels of Qinyuanling as an example,the feasibility and validity of EH-4to prospect expressway tunnel is analyzed and summarized.
出处
《工程地球物理学报》
2015年第1期50-54,共5页
Chinese Journal of Engineering Geophysics
关键词
EH-4成像系统
隧道工程
静态效应
近源效应
EH-4electromagnetic image system
tunnel engineering
static effects
source effect
