Settlement Prediction of Pile-Supported Structures in Liquefiable Soils During Earthquake

Abstract eng:
It is observed from the past earthquakes that the pile foundations in liquefiable soil are very susceptible to damage or failure. Often, the structures in liquefied soil experience excessive tilting and/or settlement. Though, the failure is often attributed to lateral spreading of the ground, however detailed study of some case histories shows that the settlement of pile foundation could be a potential failure mode that can cause tilting of the structure. The settlement of a pile when loaded axially is considered to be of three parts: (a) Axial compression of pile; (b) Slip between soil-pile interface; (c) Settlement of the soil mass as a whole. This present addresses the issue of settlement of pile-supported structures due to the loss of pile capacity in liquefied soil. A simple mathematical model that can be implemented in an EXCEL type program has been proposed for characterizing the above phenomenon. The method uses envelopes of unit load transfer curve that describes the axial load transfer mechanism of the pile foundation in liquefied soil.

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