CSAMT在摩天岭隧道地质勘察中的应用  

APPLICATION OF CSAMT METHOD TO GEOLOGICAL EXPLORATION IN THE MOTIAN MOUNTAIN TUNNEL

作　　者：李章喜[1] 顾汉明[1] 冉昌国[2] 

机构地区：[1]中国地质大学地球物理与空间信息学院,武汉430074 [2]交通部第二公路勘察设计研究院,武汉430056

出　　处：《工程地球物理学报》2006年第3期187-191,共5页Chinese Journal of Engineering Geophysics

摘　　要：可控音频电磁法（CSAMT）应用于国道重庆巫山至奉节段高速公路的摩天岭隧道断层及其岩溶的勘察，采用发射源的偶极距离为2kin，发射机与接收机之间距离为9．5km，反射频率为2^0～2^13Hz的14个频率，接收沿测线方向的电场和垂直测线方向的磁场。采用带地形的二维平滑模型稳健的反演迭代算法获得电阻率剖面，通过与钻探及地质调绘的资料对比，CSAMT法可以在宏观上查明深埋隧道地层岩性、地质构造（断层、岩溶）及其赋水性，为钻孔布置及隧道设计、施工提供地球物理依据。This paper presents an application of the CSAMT to the detection of the cave and fault in bedrock of a tunnel located in Motian mountain. In this study, we use a transmitter source dipole spacing of 2.0 km. A transmitter - receiver spacing of 9.5 km is selected for field measurement. The 14 base frequencies between 2^0- 2^13Hz are selected as the reflection frequency. Electric field along the direction of survey line and magnetic field perpendicular to the survey line are measured. Resistivity profiles are constructed using a robust two - dimensional smooth -model inversion iterative algorithm. By comparing with borehole data and geological layer information, CSAMT can macroscopically get the geological structure and formation water saturation of deep - buried tunnel and provide useful information for selecting borehole location and tunnel design and construction.

关 键 词：CSAMT 深埋隧道 地质勘察 

分 类 号：P631[天文地球—地质矿产勘探]