Study And Implementation On The Parallel Finite Element Based On Strata Information

In the thesis, a synthetical integrated of the system of parallel Finite Element Method(FEM) and intelligent searching algorithm based on 3D-strata information is proposed and built up to satisfy the requirement of the geotechnical engineering. The method is based on FEM analysis, 3D-strata information and combined with evolution algorithms and parallel computing method. The main contents of this paper are listed as bellows:1. Considering the most common used data, the contour line, the well log and the engineering geological cross–section, three-dimensional topological grid of multi-layer is put forward. It's based on Digital Evaluation Model (DEM), and it's truely three-dimensional. The paper studies the data resource for the numerical analysis and presents generating methods based on grid.2. In this paper, a parallel FEM codes on a cluster of workstations (COW) platform using MPI is developed by using the C++ object-oriented techniques. The classes describing the parallel FEM model are designed and their implementation method are studied. Domain Decomposition Method is researched on the parallel preconditioning conjugate gradient for large-scale sparse matrix equations. The compressed sparse row storage format for the matrix is designed, and a high efficient parallel solver for the equations is also developed. Combined with the stress releasing method and the death element method, a parallel excavation method is put forward in this paper.3. Recognition of relevant parameters through back analysis of displacement in the large scale geotechnical engineering is difficult. Existing back analysis methods are not sufficient to provide the necessary accuracy and speed. To solve the kind of...