| 梁芳敏,欧东新,魏继祖.有限单元法在电阻率法地形改正中的应用[J].矿产勘查,2011,2(3):293-297 |
| 有限单元法在电阻率法地形改正中的应用 |
| Application of finite elements method for two-dimensional terrain correction in resistivity method |
| 投稿时间：2010-08-09 |
| DOI： |
| 中文关键词: 有限单元法 数值模拟 视电阻率 地形校正 |
| 英文关键词: finite element method numerical simulation apparent resistivity terrain correction |
| 基金项目: |
|
| 摘要点击次数: 2651 |
| 全文下载次数: 1427 |
| 中文摘要: |
| 文章应用有限单元法进行点源二维电场数值模拟计算。在正演过程中采用三角单元剖分网格,有利于对复杂地形的模拟。电导率(σ)和电位在相邻节点间线性变化,使得电导率和电位与实际地质构造更接近、与实际地电场变化规律更易吻合；在点源二维电场正演基础上,将一定地形条件下的二维地电模型的视电阻率响应,分解为畸变场和正常场两部分,采用比值法消除由地形起伏引起的视电阻率畸变,从而达到地形校正的目的。并通过设计几个模型及实际算例,验证该方法对地形校正的效果。 |
| 英文摘要: |
| In this paper, the forward modeling of point-source electrical field on a two-dimension structure is calculated with the finite elements method applying FEM for forward simulation. In forward operation, the triangular cell is employed for the conversion calculation of the 2-D FEM, with electrical conductivity (σ) and the electric potential in the triangular with linear change, which allows electrical conductivity and potential get closer to the actual geological structure, and the actual change in electric field is more accordant. Based on the finite elements method forward modeling, authors divide the apparent resistivity response of 2D model into two parts:normal part and abnormal part, and remove the abnormal effects of the topography, and got the resistivity value without topographic effects by using Ratio-Method. Calculating several models and observed data show that the method of FEM simulation and the terrain correction is accurate and feasible. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|