3D interaction analysis of pile-soil-raft considering the consolidation of substratum

A new calculating model for the consolidation settlement of piles group was built by approximately simulating the stress and permeability field of vertically loaded piled raft foundation. The effective and total stress in substratum at any time was obtained by applying the consolidation solutions with impeded boundaries.The settlement of pile tip can be evaluated by layerwise summation method. Thus the stiffness of single pile in pile groups can be obtained at any time.Then it is agglomerated to the raft,and the raft was analyzed by finite element method.A software for analyzing the pile-soil-raft interaction was developed. The development of internal force, deformation of raft and reaction on top of pile can be gained. One case study was also carried out to show the application of the present method to practical pile group problems.