南水北调西线千米深长隧洞围岩构造地球物理勘探

Geophysical exploration of a long deep tunnel on the west route of South-to-North Water Diversion Project

2004年对南水北调引水隧洞西线一期工程中玛柯河-贾曲段20 km深埋长隧洞进行了地质结构面、岩性特征、赋水性等地球物理勘探、工程地质勘查,并进行综合解释以查清勘探区影响引水隧洞工程建设的不良地质体和不良地质构造.本文介绍了CSAMT法隧洞勘探的特点、资料采集的过程及应特别注意的复杂地形资料处理技术,结合其他补充物探手段及地面工程地质勘察结果对20 km深埋长隧洞围岩介质的结构特征进行了解释,指出了可能影响工程的断层、破碎带及异常区.

It is very important to explore for the weak geologic bodies and structures that may affect the tunnel safeness. We carried out geophysical and engineering geological exploration and integral interpretation to detect the geological structure, rock properties and water bearing characteristics in 2004 for the 20 km long deep tunnel between Make River and Jiaqu River on the west route of South-to-North Water Diversion Project. The paper presents the advantages of CSAMT tunnel exploration, data collection procedure and the data processing techniques for rough topography and complex media. According to the geophysical and engineering geological exploration results, the paper explains the geological structure characteristics of the 20 km tunnel media and indicates the faults, fractures and some anomalies that may cause danger for the tunnel construction.