基于时域有限差分(FDTD)的瞬变电磁三维正演已经基本实现,但是复杂三维体的建模还存在问题,从而影响瞬变电磁对于复杂模型响应规律的分析.本文针对复杂模型的几何建模及Yee元胞的网格剖分问题,基于GID软件平台进行了二次开发,编写了"FDTD问题类型",通过编写代码,获得了能够直接应用于FDTD三维正演的网格剖分节点数据.文中利用GID软件对实际采矿巷道、隧道内TBM机模型、以及矿体模型进行建模,并采用FDTD方法进行正演计算.计算结果表明,基于二次开发的GID的可视化建模能够满足目前复杂模型建模的需求,为瞬变电磁FDTD三维正演模拟提供有力的支持.
3DTransient Electromagnetic Method forward based on FDTD method has been achieved,while the modeling of complex models is difficult to operate,thus the analysis of response regularity for complex model is affected.To solve the problem of complex geometric modeling and meshing of Yee grids,secondary development of GID software has been realized in this paper,the codes of"FDTD-Problem type"was written to get grid and mesh node data which can be directly used in FDTD 3Dforward software.Models of TBM equipment in tunnel;mining tunnel and ore-body were built with GID and computed with FDTD 3D forward software. Results of numerical simulation show that modeling based on the secondary development of GID software can meet the complex geometries' modeling need of 3DTEM forward with FDTD and can provide strong support.