电磁法在活动断层勘察中的应用研究

Study on the Application of Electromagnetic Method in Active Fault Exploration

活动断裂对工程建设影响巨大,在线路设计时如无法避开,应垂直断裂构造线走向,以最短的距离通过。新规划中卫至兰州客运专线在大营水村以桥梁和路基的方式近垂直角度穿越海原断裂带。本文采用大地电磁法和电测深法相结合的探测方式,对海原断裂带高枣坪断层、赵家岘~小红门断层进行探查,探查结果分析了F2和F3断层的位置、产状及破碎带宽度等内容,为线路选择提供了重要依据。

Active faults have significant influence on the project under construction. If it＇ s impossible to avoid these faults during the preliminary designing step, the general trend of the building should be perpendicular to the fault strike and with the shortest distance. The Dayingshuieun section in the course of Zhongwei-Lanzhou Passenger Dedicated Line is designed in the form of bridge and roadbed crossing the Haiyuan fault perpendicularly. In this paper, the author combined with the magnetotellurie and electric sounding methods to investigate the Gaozaoping fault and Zhaojiajian-Xiaohongrnen fault amongst the Haiyuan fault belt. Based on the investigation results, the location, occurrence, activities and width of the F2 and F3 fracturing zones were analyzed, and all of these could provide solid foundation for selecting the sites of the line.