Design Application Of Pile Raft Foundation’s Mixing Simplified Method

Due to its good force performance and Economic Benefits, piled raft foundation is widely used in construction, bridges and ports. In the actual project, the Interactionabout soil andpilein piled raft foundation, affect engineers’ understandingof the working mechanism of the pile raft foundation, especially in the current calculation method needs to be able to reflect the nonlinear deformation behavior of pile raft foundation caused by soil.Also describes the stress mechanism of pile-soil sharingload, raft and piles act together.This article seeks to find the calculation method that is reliably and easily calculated to be used in the actual engineering. With the Simplified piled raft foundation model take the finite element method to develop the simplified program.In this paper, mainly research the following arrears:(1) Describes the calculation methods that is combined by finite element method and the load transfer method. use the finite element method to analyze the pile, use the load transfer method to analyze the interaction of pile and soil. Considering the Phase of Elastic, plastic and slipbased on Incremental form to describe Load Transfer curves of the pile, use the approximation analysis of nonlinear to analyze the pile groups; Based on the assumption of contact stress in raft and foundation soil, analyze the interaction of raft, soil and pile on soil’s Influence of soil stiffness matrix stiffness by Mindlin elastic solution.(2) This paper developed the mixing simplified method based for finite element p rogram of pile raft foundation by the Matlab language. Applicability and accuracy of th e method based for finite element program were Assessed completely and accurately b y a numerical example. the methods program which were drew up in this article can rea ppear the previous research findings completely, it has a relatively broad engineering a pplication prospects.(3) Mixing simplified method based of pile raft foundation’s application in the de sign of piled raft foundation, and the simplified method is applied to analysis of pile de position impacting on neighboring tunnel, it not only shows that the method can be used for preliminary design and calculation of checking, but also can give a detailed desig n performance prediction, it has a strong application in practical engineering.