Abstract：A methodology is proposed for the global stability analysis on slope of piled foundation wharf，in which the interaction of piles and soil is considered，and some modifications to the existing design codes are presented. Genetic algorithm is employed in searching for the potential circular slip surface that has minimum safety factor. The circular slip surface is assumed and Bishop simplified method incorporating the stabilization effect of piles is adopted to calculate the safety factor of slope. An existing method based on the plasticity theory is used to determine the lateral forces acting on the pile section above the critical surface. The maximum stabilizing force of each pile is determined according to its embedded depth under different position of slip circle. In the presented methodology，the piles and slope can adopt different safety factors. By the calculations and comparisons on concerning engineering examples，the method is proved to be convenient，rapid and effective for the slope and pile system.
