It is well-known that reasonable construction methods can make engineering practice benefit good economic returns and efficiency. However,the conventional theory and design method on construction process of foundation system is not sound and sophisticated enough in engineering and academic domain,and the working mechanism and performance of excavation interaction system needs more intensive study. In this paper,elasto-plastic numerical analyses are conducted by establishing finite element model of excavation interaction system including piled raft,subsoil,and bracing diaphragm,which adopts infinite element to simulate half-space feature of subsoil to avoid static boundary effect and also considers soil elastoplasticity of constitutive relationship by using Mohr-Coulomb yield criterion. Furthermore,discontinuous interface behavior between subsoil and diaphragm wall is described by Coulomb contact theory on the basis of penalty algorithm. Through computational results and theoretical discussions,several conclusion remarks are drawn,which can provide valuable and referable experience to some extent for related engineering practice and design.
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