复杂地质下大型地下洞室群三维有限元建模

Modeling For 3D FEM Analysis of Large-Scale Grottos in Complicated Geological Strata

采用超单元网格法对某地下洞室群总平面布置图和典型断面布置图进行二维有限元网格划分,结合控制断面线性插值的方法,对复杂地质条件下大型地下洞室群进行可供渗流有限元计算的三维网格的自动划分。该法较好地解决了因计算边界复杂、地层材料分区多变、建筑物突变导致的很难自动生成三维有限元网格的问题。工程实例建模表明,该方法具有操作简单、适应性强、单元形态较好等优点。

Based on the planar mesh generation of general arrangement plan and typical sections,combined with the linear interpolation of control sections,the automatic division of 3D FEM mesh for large scale underground caverns’seepage analysis was realized by means of the super-element method under complicated geological conditions. This method contributed a solution for the problems caused by the complex boundaries,polytropic strata materials and the saltation of the buildings. Several engineering applications show that this method is more simple,applicable and efficient.