复杂地质条件下超大型洞室群有限元网格的自动生成

Mesh Auto-generation for 3D FEM Analysis of Large-scale Grottos in Complicated Geological Strata

本文提出的“断面节点控制法”通过建立少量的以地质勘探剖面图为基础的主控制断面 ,经主控制断面二维网格划分、次控制断面衍生和运用多种合拆、连接及插值方法 ,对含有大型地下洞室群的复杂地层 ,进行了可供渗流有限元计算的三维空间计算网格的自动生成。该法较好地解决了当计算对象边界复杂、材料分区多变、研究区域庞大时 ,给自动形成三维有限元网格带来的不便和困难。多个工程实例应用表明 ,该法运用简单、适应性强、效率较高。

In the paper,the method of section node control is first time presented to solve the problem of 3D mesh auto generation in FEM analysis when geological strata are complicated and large scale grottos are excavated.The geological exploratory section maps are used as chief control sections,in which a small amount of data preparation is needed.The 3D mesh is generated in the whole calculation region by means of merger, linking, and interpolation.Several engineering applications show that this method is simple, more applicable and efficient.