高频大地电磁法在长大深埋隧道勘察中的应用研究  

Application research of high frequency electromagnetic method in survey of long-deep tunnels

作　　者：邓居智[1,2] 李红星[2] 杨海燕[2] 谭捍东[1] 

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083 [2]核资源与环境教育部重点实验室(东华理工大学),南昌330013

出　　处：《工程勘察》2010年第9期85-89,共5页Geotechnical Investigation & Surveying

基　　金：深部探测技术与实验研究(SinoProbe-03-04);国防基础科研(A3420060145)资助

摘　　要：深埋长隧道的地球物理勘查工作主要是探测洞线高程附近的隐伏不良地质体的发育情况,高频大地电磁测深具有不受高阻屏蔽、轻便、探测深度相对较大等优点。根据深埋长隧道附近不良地质体的特点,研究了利用高频大地电磁法(EH4)进行隧道勘查的几个关键技术,重点分析了平行测量的重要性、磁探头布设对观测数据的影响、过渡带数据特征及校正方法及静态效应的形成机制及影响。通过在贵广铁路某隧道勘察的应用实例,分析总结了高频大地电磁测深法在深埋长隧道勘察中应用的可行性及有效性。In geophysical exploration work for long-deep tunnel,the issue is mainly concentrated on bearing conditions of potential unfavorable geologic body near the area of tunnel line.High frequency electromagnetic methods are characterized by unshielding of high resistivity layers,portability,and large penetrating depth.Based on the characteristics of unfavorable geologic body,some key techniques of EH4 using in tunnel prospecting are investigated.The emphasis is the importance of parallel survey,the effect of the magnetic probe＇s orientation and horizontal,the source effect and its correct technique and the static correction.This paper is based on the surveying results obtained with EH4 in a tunnel of Guizhou-Guangzhou railway,the feasibility and validity of high frequency electromagnetic method to prospect long-deep tunnel is analyzed and summarized.

关 键 词：高频大地电磁 长大深埋隧道 过渡带 静态效应 

分 类 号：P631.325[天文地球—地质矿产勘探]