Research On The Numerical Analysis And Adjustment Coefficient Of The Bearing Capacity Of The Cast-in-place Piles With Expanded Branches Or Plates

Cast-in-place piles with expanded branches or plates based on common concrete bored piles are a new type of piles foundation which have the specialty of high vertically bearing capacity and have been marked both economic and social benefits. However, there are still some problems both in theoretical research and practice such as the characteristics of the stress and strain, .Meanwhile the optimal distances between plates and piles have not been determined.In particular, firstly we account for the construction method of piles and the points during this process by introducing the latest construction machine. Secondly, we take a fully theoretically analysis of a project including the theory of the load transferring load-bearing capacity and destroy form. We also introduce our work during the compiling of the Specification of Cast-in-place piles with expanded branches & plates. We work out the coefficients in the expressions of the Specification by a lot of data and a program which we developed. The problems in the Specification are also considered. We have also done numerical simulations of Cast-in-place piles with expanded branches or plates utilizing finite element method software ANSYS and by analyzing the distributions of stress field and strain field of Cast-in-place piles with expanded branches or plates, we can determine the optimal distances between plates and piles. By all these results we can offer a practical method for all designers.