The pile raft foundations has very good earthquake resistance effect. Different from usually separating foundation calculation from subgrade calculation, pile-soilstructure interaction system combines pile raft foundations with ground soil for rigidity conformity, obtains total rigidity matrix of rigid foundations, and makes rigid foundations and the superstructure work together to analyze the characteristic of structure. Analyzing the variety of rigidity for structure foundation soil in earthquake action, it can be obtained the variety of characteristic value of subgrade bearing capacity. Considering pile-soil-structure interaction system, we can calculate stress and strain for subgrade and foundations, and estimate stabilization condition of subgrade and foundations.
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