三维地层信息系统与有限元方法集成研究

STUDY ON INTEGRATION OF 3D STRATA INFORMATION SYSTEM AND FEM

通过分析三维地层信息系统中的地层可视化网格和地下工程中有限元网格划分的主要原则及方法,阐明了三维地层信息系统中可视化网格不能直接用来作有限元分析的原因。提出了适于三维可视化和有限元分析的 L-W 拓扑模型。利用 FORTRAN 和 Viusal C++混合编程的方法使两者集成于一个统一的系统中,并给出了一个应用实例。

Three-dimensional strata information system (3DSIS) is a system for storing, managing, checking, manipulating and displaying data which are spatially referenced to the underground strata. But the grids for visualization in 3DSIS are triangular prisms and can't be directly used in finite element method. Based on the principle of mesh generation in FEM, the reasons are given that the visualization grids in 3DSIS can't be used in FEM. A local-whole (L-W) model which is suited to 3D visualization and FEM is put forward. Using the L-W model, the grids are easily changed into the meshes of FEM. The key points that control the stratum shape are obtained by the topological analysis, and then lines and areas are defined, and solid model features are generated from the bottom up, and then new grids are regenerated. An integration system of 3DSIS and FEM is developed by the method of mixed-language programming using FORTRAN and Visual C++. And at last, the application of the integration model is given.