基于南水北调西线工程岩性特征的CSAMT法有限元三维数值模拟研究

Three dimensional controlled source electromagnetic numerical simulation based on the rock properties of the west line of South-to-North Water Diversion Project using Finite Element Method

有限元法是地球物理数值模拟中常用的方法,本文采用三维可控源音频大地电磁法(CSAMT)有限元数值模拟的程序,根据南水北调西线工程岩性的地球物理特征,设置了不同的三维模型,并对其进行了有限元数值计算分析,从三维空间中模拟场的规律,探索了不同地质异常体的特征,为提高可控源音频大地电磁法在南水北调西线工程深埋藏隧洞探测地质异常体的精度奠定了基础.

Finite Element Method is commonly used in geophysical numerical simulation. According to rock geophysical characteristics of the west route of South-to-North Water Diversion project, different 3-D models were constructed and numerical calculation analysis was carried out with finite element method. The pattern of the field in three-dimensional space is simulated, the characteristics of different abnormal geologic bodies were probed. It has established a basis for improving CSAMT accuracy of surveying the abnormal geology body hidden in deeply buried tunnel in South-to-North water diversion west line project.