起伏地形下隐伏异常体瞬变电磁法探测的模拟实验研 究

本文设计了不同地形条件(凸地形、凹地形、斜坡以及不同坡度)下深埋地下洞室的探测实验,在满足相似性要求的前提下,通过缩比、实际物性的模拟,测量得到与实际相同或成比例的响应场。研究了模拟实验方案的设计、实验材料的准备、模型搭建、实验数据的采集与处理,得出了复杂地形条件下采用不同装置(重叠、中心、偶极)的球、柱体的瞬变电磁模拟响应特征。可为复杂地形条件下低阻球、柱体的异常识别提供理论和数据基础,评估针对地下洞室、采空区的瞬变电磁探测技术的有效性。

RESEARCH ON MODEL EXPERIMENT OF TRANSIENT ELECTROMAGNETIC METHOD TO DETECT DEEP UNDERGROUND CAVITIES IN COMPLEX TERRAIN

To study the application of the principle and technology of TEM prospecting, the authors designed experiments to detect deep-buried caverns under different landforms (mount, valley, slope with different angles). Under the precondition of similarity, by geometrical scaling and actual physical property simulation, response field results same as or proportional to that of prototype are obtained. The authors studied the design of configurations of model experiments, the preparation of experiment materials, the model building, the data acquiring and processing, and got the response characteristics of spherical and cylindrical targets by different devices (superposition, center, and dipole) under complex terrain conditions. The study can provide the principle and data foundation for identifying spherical or cylindrical objects with low resistivity under uneven land surfaces and evaluating the validity of detecting underground caverns by TEM.