基于音频大地电磁测深法的某隧道工程地质探查

Engineering Geological Exploration of a Tunnel Based on Audio Magnetotelluric Sounding Method

应用经济高效的音频大地电磁测深法对隧道中轴线进行探测,再使用SSMT2000、MT‐soft2D等软件对数据进行处理,最后通过反演的视电阻率剖面对研究区电性结构特征进行分析,从而推测地质构造特征、富水情况及不良地质体的空间分布等。音频大地电磁测深法对研究区高阻地质体中低阻异常反应敏感,低阻区多为含水断层或溶洞等软弱地层,此类不良地质体是研究寻找的主要目标,对工程的开展具有重要意义。

The economical and efficient audio magnetotelluric sounding method is used to detect the central axis of the tunnel,and then the data are processed by SSMT2000,MTsoft2D and other software.Fi-nally,the electrical structure characteristics of the study area are analyzed by the inverted apparent resistivity profile,so as to speculate the geological structure characteristics,water-rich conditions and spatial distri-bution of unfavorable geological bodies.Audio magnetotelluric sounding method is sensitive to low-resis-tance anomalies in high-resistance geological bodies in the study area.Low-resistance areas are mostly weak strata such as water-bearing faults or karst caves.Such unfavorable geological bodies are the main tar-gets for research and are of great significance to the development of the project.