V8可控源音频大地电磁法在铁路隧道不良地质勘察中的应用

铁路隧道不良地质调查是规避施工风险的重要方面,高效快捷的可控源音频大地电磁法利用不同岩性和相同岩性不同辅存结构间所反映的电性特征差异,可以较好地进行围岩级别划分和断裂破碎带判别,为隧道设计和施工提供资料依据。文章结合云桂线铁路定测阶段的施工,选择了灰岩、砂页岩、板岩及含矿围岩等典型地段具体实例,对围岩分级和不良地质体圈定进行了分析,并认为在隧道施工中兼顾矿产资源勘查也是必要的。

Application of V8 CSAMT on railway tunnel anomaly rock exploration

To survey anomaly geological rock is important on railway tunnel construction and one of the important method is CSAMT.The principle of CSAMT is based on electrical characteristics of different lithology and auxiliary storage structure of different lithology.To make full use of electrical characteristics,the levels of wall rock and fracture for rail tunnel construction design can be determined.The profile across limestone,sandstone,shale,slate on Yungui railway tunnel is a real example for rock grading standards and anomaly geological discriminant principle.The mineral resource exploration following the railway tunnel investigation shall also be considered.