An approximate approach for the analysis of composite foundation with hybrid piles

Based on imaginary piles model, integral equation approach was applied to analyze composite foundation with hybrid piles. By simulating the cushion with the Winkler spring, the effect of cushion was taken into consideration, and then the second kind of Fedholm’s equations were deduced to solve the problems. Using the numerical calculation, compression of cushion, loads shared by piles and subsoil, load transfer characters and stress distribution of subsoil were obtained. Comparison with the finite element method and experiment results verified the accuracy of the present calculation method. Finally, the influences of pile length on the working behavior of the foundation were studied. The present method is suitable to analysis the foundation under working loads.