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慈母山隧道是重庆市城市快速干道之“三横线”的关键节段工程,隧址区地形地质条件复杂,隧道涌突水、断层破碎带、煤系地层与瓦斯成为工程的主要不良地质和施工地质灾害问题。为查明上述不良地质,沿隧道轴线采用高频大地电磁测深(EH-4电导率系统)方法开展地球物理探测,并根据探测结果,圈定了低阻异常区,与隧道施工开挖对比分析表明,发生涌水的位置、断层的位置均处于低阻异常范围内。实践表明,该方法探测深度大、精度较高,有助于查明隧道富水条件、断层带等不良地质体,提高隧道宏观超前地质预报的准确性。
The “Cimolinshan Tunnel” is a key section project of “three horizontal lines” of urban expressway in Chongqing. The topographical and geological conditions in the tunnel area are complex. The water surge in the tunnel, fault fracture zone, coal measures and gas have become the major defects of the project Geology and construction geological disaster. In order to find out the above-mentioned bad geology, geophysical exploration was carried out by using the method of high-frequency geomagnetic electromagnetic sounding (EH-4 conductivity system) along the tunnel axis. Based on the detection results, the low resistivity anomalous zone was delineated and contrasted with the tunnel excavation It shows that the location of water gushing and the location of fault are within the range of low resistance anomaly. Practice shows that this method is of great depth of detection and high precision, which is helpful to find out the unfavorable geological bodies such as water-rich tunnels and fault zones, and to improve the accuracy of macroscopic geological prediction.