An analytical method for rigid piled-raft foundations subjected coupled loads in layered soils

抄録

A simplified analytical approach is proposed to study on the behavior of the piled raft foundation with rigid raft subjected coupled loads in layered soils. Employing the shear displacement method, based on the transfer matrix, the pile-pile interaction under vertical load is analyzed. Adopting the modified subgrade modulus, the pile head-pile head interaction under horizontal load is analyzed through the finite difference method. Base on solutions for stresses and displacement in layered elastic half space, the interactions between pile head and soil surface, soil surface and pile head, soil surface and soil surface subjected coupled loads are taken into account to determine the flexibility matrix of the pile group-soil system. Then the load-settlement relationship of rigid piled raft foundations subjected coupled loads, load and settlement of the piles along the depth are obtained. Comparison among the results of the finite element and the calculated results is carried out, and the feasibility of the present method for the analysis of piled raft foundation and the superiority of the modified subgrade modulus are proved.