Inprovement Of Three Dimension Finite Element Program Of Foundation Pit Excavation

This dissertation illustrates the deep excavation engineering and the finite element method's developing condition, describes the reason of works accident in the fact at present and summarizes the experience, and emphasizes the importance of the dynamic design, so we can't only depend on the predict value in the actuality.In the paper, there deduce the three-dimensional elastic-plastic formulas and establish the mathematical model for this program; Consider the influence of the interface; Add the water pressure factor to the previous program and calculate and analysis the deformation and state of force bearing under the impact of the unsaturated soil pressure; Each functional subprogram is tried to be independent and used as a module, which could be called and modified anytime to enhance readability and generality for the purpose of making following work successful ahead.Through the error analyses of the result, the paper emphasize the importance of the dynamic design besides the complexity of the foundation pit engineering and the program whom self which can cause error. To gain the result which more credible than ever, some advice is given to the following work to make the program progress.