【摘要】 复杂地形条件下的电阻率异常解释是十分困难的:①地形的起伏改变了地下电流场,使其分布规律不同于水平地电条件下的电流场;②在实际的观测过程中,测点至场源的距离与地表水平情况的差异直接影响到了正常的解释工作。针对这一实际工作中遇到的问题,运用四面体单元的三维有限元数值方法对复杂条件下的电阻率异常进行了理论研究,文中选用了几例典型地质模型。结果表明,采用四面体单元的有限元法研究复杂条件的影响是可行的,有效的。更多还原

【Abstract】 The anomalous interpretation of resistivity under complicated terrain is very difficult. Firstly, the undulate of topography alters the subsurface electric field, which makes the distribution rule of the field differ from that of the field under horizontal case. Secondly, the difference of the distance from the observing point to the field source between the rolling and the horizontal affects the normal interpretation directly. With respect to the problem, a new 3-D FEM with tetrahedral element applied to the theory study of resistivity anomaly under complicated conditions is presented in this paper, and several typical geological models are selected. Some graphic results are given to illustrate the accuracy and effectiveness of the FEM with tetrahedral mesh.更多还原