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Piling (Civil engineering) -- Design and construction, Soil liquefaction, Foundations, Slopes (Soil mechanics) -- Stability


The design of piles penetrating liquefiable soils poses a number of challenges, including 1) accounting for the effects of liquefaction on lateral soil springs (p-y), 2) estimating liquefaction-induced kinematic demands (lateral spreading displacements) including pile-pinning effects, and 3) combining the effects of inertial demands from superstructure and kinematic demands from liquefied ground. This paper illustrates two approaches to address the above questions: A) a simplified decoupled approach adopting equivalent static analysis (ESA), and B) a detailed, coupled approach adopting nonlinear dynamic analyses (NDA). These approaches are presented through example projects showing the limitations and the potential conservatism associated with the simplified decoupled ESA approach, the benefits of using more rigorous coupled NDA approach, and recommendations on how to modify ESA methods, when used, to approximate outputs from advanced NDA for slope instability-induced demands on piles. These modifications include using pile-restrained, rather than free-field, soil displacements in the ESA, to reduce conservatism associated with these methods.


Presented at the 6th International Conference on Earthquake Geotechnical Engineering 1-4 November 2015 Christchurch, New Zealand

*At the time of publication Arash Khosravifar was affiliated with Fugro Consultants Inc.

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