高频大地电磁法在云雾山隧道勘察中的应用  

Application of High-frequency Magnetotelluric Method in the Survey of Yunwushan Tunnel

作　　者：白雪源 

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2013年第8期35-38,共4页Railway Construction Technology

摘　　要：云雾山隧道是成渝高速公路复线的关键节段工程,按设计属于特长深埋双洞隧道。隧址区工程、水文地质条件复杂,岩溶、断层较为发育。高频大地电磁测深具有不受高阻屏蔽、探测深度较大、受地形影响较小、分辨率较高、操作较为便捷等优点。介绍以EH-4电导率成像系统为代表的高频大地电磁法在云雾山隧道勘察中的应用情况,其结果表明:高频大地电磁法(EH-4)在特长深埋隧道勘察中能够有效用于识别并圈定数百米范围内的不良地质体,从而为隧道的设计、施工提供地球物理依据。Yunwushantunnel is a key project section of the double line of Chen-Yu Expressway,which is designed to be an extra-long deep-buried twin-tube tunnel.The conditions of engineering geology and hydrologicalgeology are complex in the project region,within which there are several karst zones and fault fracture zones.High-frequency magnetotelluric sounding method is characterized by several advantages,such as being not shielded by high-resistivity layers,having comparatively large penetrating depth,being relatively less affected by topographic forms,having high resolution,being portable and productive.In this paper,we show the application of high-frequency magnetotelluric method（EH-4 conductivity imaging system）in the survey of Yunwushan tunnel.Results suggest that the method can be effectively used to detect and delineate unfavorable geological bodies in the survey of tunnels and therefore provide geophysical basis for tunnel design and construction.

关 键 词：隧道勘察 高频大地电磁法 EH-4电导率成像系统 不良地质体 

分 类 号：U452.1[建筑科学—桥梁与隧道工程]