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金属矿山 ›› 2008, Vol. 38 ›› Issue (11): 66-70.

• 地质与测量 • 上一篇    下一篇

一种基于八叉树的地质体三维网格剖分方法

何鑫,王李管   

  1. 中南大学
  • 收稿日期:2008-09-29 出版日期:2008-11-15 发布日期:2011-07-12

Octree Based Method for 3D Mesh Generation of Geological Bodies

He Xin,Wang Liguan   

  1. Central South University
  • Received:2008-09-29 Online:2008-11-15 Published:2011-07-12

摘要: 提出了一种地质体三维四面体网格的剖分方法。该法以八叉树法为基础,采用正四面体包围盒代替传统的六面体包围实体,进行八叉树剖分,直接形成比较规则的四面体网格,然后利用常见矿业软件生成的表面模型对四面体网格进行实体边界的恢复。此时,边界处的网格单元往往分布不均匀,质量不理想,并且存在一些薄元,需要优化和消除,以形成有限元分析所需的高质量四面体网格。

关键词: 八叉树, 四面体, 矿体, 网格, 实体边界

Abstract: A method of 3D tetrahedron mesh generation of geological bodies is proposed. Based on octree method, the method adopts tetrahedron as the encasing box instead of conventional cube to generate well-shaped tetrahedron meshes. Then, the boundary of the geological body of the tetrahedron meshes is recovered with the surface model generated by usual mining software. The optimization is required as the meshes at the boundary are often in non-uniform distribution and have non-ideal quality and there are some thin units which should be eliminated so as to form high quality tetrahedron meshes needed for finite element analysis.

Key words: Octree, tetrahedron, geological body, mesh, entity boundary