| This text is on the basis of analysing and researching domestic and international about the board foundation analytical method of the raft and research current situationly , utilize the number value analytical method of finite element, deform to raft board foundation characteristic and raft board foundation optimization question of the structural design carry on preliminary analysis and exploration, set up a reasonable model of interaction analysis of raft foundation and the ground and top structure.The main works in this paper as follows: (1) According to the Kirchhoff theory of Small deflection of thin slab, adopt layers horizontal isotropic elasticity half-space ground model, merge effect of ground into crooked differential equation , utilize finite element method analysis to analyse the foundation and ground, through the ANSYS procedure , analyse the raft board foundation on the elastic ground . (2) According to top structure , foundation and ground real working condition of interaction , utilize the finite element of a structure of space pole to analyse the top structure, use sub-structure condense technology couple top structure finite element and the finite element of raft foundation at the elastic ground and then, through the analysis of ANSYS procedure , investigate that the top structure affect on the strength and performance of shape of the raft foundation. (3) through investigate raft board concrete intensity ,thickness of foundation, load and ground nature of soil etc ,to get the conclusion of basic optimization design of raft board.
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