Elasto-plastic Numerical Analysis Of Working Performance Of Composite Foundation With Piles And Cushion

Due to potential of subsoil and reinforcement sufficiently developed, composite foundation can make engineering practice benefit good economic returns by increasing bearing capacity and decreasing settlement of subgrade. However, so far the computational theory and design method of composite foundation is not sound and sophisticated in engineering and academic domain, and its working performance and mechanism needs more intensive study. Therefore, it may provide valuable and referable experience for engineering practice and design to extend related research on loading characteristics of internal forces and deformation of composite foundation. On the basis of previous research, analyses of working performance of composite foundation with piles and cushion r are conducted around two faces as follows by numerical method in this pape:1 On the basis of ABAQUS programs, the characteristics of internal forces and deformation of composite foundation system including raft, cushion and piles during loading stages are analyzed by developing elasto-plastic FE model in plane stress state, adopting Mohr-Coulomb yield criterion to describe the elaso-plasticity of subsoil and Coulomb contact pair theory to simulate the contact behavior of foundation and soil, as well as using infinite element in model boundary to avoid static boundary effect.2 Based on the elasto-plastic numerical model of composite foundation with piles and cushion used above, parameterized comparative analyses are conducted by changing computational parameters related to raft thickness, cushion stiffness and piles stiffness. Then the effects of raft, cushion and piles on the whole composite foundation system are further discussed, which can more intensively display the mechanism of the bearing capacity and working performance.