Controlled source audio-frequency magnetotelluric (CSAMT), which smoothly filters and statically rectifies field data and interprets geological deduction based on a 2D inversion section of resistivity, was applied to the survey of the deep-buried Dawan Tunnel on the Shantou-Kuming expressway. Combining the geological plane graph and physical property parameters, the problems related to the complex karst were deduced and the distribution of the corrosion development zone and fracture zone were successfully identified by CSAMT.%可控源音频大地电磁法(CSAMT)对野外资料进行圆滑滤波以及静态校正后,以卡尼亚电阻率二维反演剖面为实际勘察资料,在电阻率二维反演剖面的基础上进行了地质推断解释.文章中将该方法应用于汕昆高速公路广西境河池至百色段岩溶区深埋藏大湾隧道勘察,并结合工区地质平面图资料以及物性参数,对地下复杂岩溶病害进行了推断解释,成功划分了隧道经过处溶蚀发育区、岩溶破碎带的分布情况,并给出了治理建议,为隧道后期优化设计、施工提供了较好的依据.
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