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

doi:10.16265/j.cnki.issn1003-3033.2020.06.004

Abstract

Abstract: In order to address uncertainties of geotechnical parameters and loads in pile foundation design, firstly, a RGD method considering multiple failure modes was proposed. Four typical failure modes, vertical ultimate limit state (ULS), vertical serviceability limit state (SLS), horizontal strength failure and horizontal deformation failure were analyzed. Then, 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 system, and the latter was used as an indicator to measure robustness. Finally, 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 geometries, key failure mode changes from horizontal strength failure to vertical SLS, which has significant influence on gradient of of system' failure probability.

Key words: soil-pile foundation system, multiple failure mode, reliability analysis, robust geotechnical design(RGD), multi-objective optimization

CLC Number:

X948

DU Xiuli, CAO Xiuxiu, ZHONG Zilan, HOU Benwei, WANG Wei. Robust geotechnical design of soil-pile foundation system considering multiple failure modes[J]. China Safety Science Journal, 2020, 30(6): 23-30.

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