AMT与TSP相结合在隧道勘察中的综合应用

Comprehensive Application of AMT and TSP in Tunnel Exploration

在地质构造复杂的地区,隧道的顺利施工和安全建设成为重中之重,本文将隧道地表探测的音频大地电磁法(AMT)和隧道内地质超前预报(TSP)两种物探方法相结合应用于香山隧道的勘察,对于长大深埋隧道,首先通过音频大地电磁法查明地质构造的位置、规模、埋深等情况,然后在开挖的掌子面附近进行超前地质预报,利用两种方法提供的电阻率参数和围岩弹性等物性参数,对掌子面前方的地质情况进行综合分析和对比,划定不良地质体,确定隧道洞身的围岩等级和破碎程度。结果表明,音频大地电磁法可以钻孔布置及隧道施工设计,超前地质预报可以准确地预报隧道施工作业前方围岩的性质、规模等。将两种方法相结合,能更好地解决复杂的地质问题,保证隧道施工顺利进行。

In areas with complex geological structure,the smooth and safety construction of the tunnel have become the top priority.In this paper,the audio magnetotelluric method(AMT)for tunnel surface detection and the geological advance prediction(TSP)in the tunnel are integrated and applied to the investigation of Xiangshan tunnel.For long and deep buried tunnels,the location,scale and depth of the geological structure are first identified by the audio magnetotelluric method,and then the advance geological prediction is carried out near the excavation face.The resistivity parameters and rock elasticity and other physical parameters provided by the two methods are used to comprehensively analyze and compare the geological conditions in front of the tunnel face.The bad geological body is delineated.The surrounding rock grade and crushing degree of the tunnel body are determined to provide reliable guarantee for the safe construction of the tunnel.In this paper,the two detection methods are combined,and the advantages and disadvantages of the two methods are compared to provide reference for comprehensive detection when using the two methods.