Research on the Additional Stress and Deformation in the Soil of Composite PileFoundation under Vertically Uniform Loads

摘要

The behavior of composite pile foundation is different from that of common pilernfoundation, which has not been understood fully yet. Therefore, this paper was designedrnto analyze the additional stress and the deformation of soil in composite pile foundation.rnThe finite element method was applied to simulate the performance of pile foundationrnunder vertically uniform loads. And the classical Boussinesq's solution was used torncalculate the additional stress. Some cases were presented to compare the behavior ofrncomposite pile foundation and common pile foundation. The calculated results show thatrnthe biggish additional stress exits in the soil between piles and the stress along the pile isrnuniformly distributed. It is certain that the soil between piles shares a certain part of loadsrntransferred from superstructure. Hence, it is suggested that the additional soil stressrnbetween piles and under piles should be considered to calculate the settlement ofrncomposite pile foundation. On the base of above suggestion a simplified method ofrncalculating the composite pile foundation settlement is presented. The case comparisonsrndemonstrate that the results of simplified method presented in this paper have a good agreement with the test data.