Robust geotechnical design of soil-pile foundation system considering multiple failure modes

In order to address uncertainties of geotechnical parameters and loads in pile foundation designꎬ firstlyꎬ a RGD method considering multiple failure modes was proposed. Four typical failure modesꎬ vertical ultimate limit state (ULS)ꎬ vertical serviceability limit state (SLS)ꎬ horizontal strength failure and horizontal deformation failure were analyzed. Thenꎬ Monte Carlo simulation (MCS) and point estimate method (PEM) nesting were adopted to compute mean value and standard deviation of failure probability for soil ̄pile foundation systemꎬ and the latter was used as an indicator to measure robustness. Finallyꎬ optimal design of soil ̄pile foundation system was finalized with robustness and cost as objectives. The results show that piles with different geometries have different dominant failure modes. With the increase of geometriesꎬ key failure mode changes from horizontal strength failure to vertical SLSꎬ which has significant influence on gradient of of system' failure probability. 中 国 安 全 科 学 学 报 China Safety Science Journal 第30卷 2020年