AXIALLY AND LATERALLY LOADED PILES IN LIQUEFIABLE SOIL

Abstract

Studies of seismic loading of substructure (e.g. piles) and liquefaction phenomenon are more than four decades old; however the combined problem of seismic behaviour of piles in liquefiable soil has received less attention. Most of the several experimental and analytical studies of this combined problem have been presented only in the last decade. Yet much has to be revealed especially the influence of flow characteristic on the behaviour of the system. Pile foundations may undergo substantial shaking while the soil is in a fully liquefied state and mass suffer severe cracking or even fracture. Therefore study on the performance of piles in liquefiable ground under earthquake loading is attempting here. The dissertation report gives the salient features of soil-pile interaction in liquefiable soils using Winkler soil model. Beacause of versatility and simplicity in application the winkler model is preferred. These models can simulate most of phenomena involved in soil pile interaction: soil non-linearity, soil- pile gapping, and pile-soil-pile interaction in groups of piles, The objective of this dissertation are study of pile-soil interaction and the response of pile in liquefiable soils for both the axial and lateral load using Winkler model in the time domain. This dissertation describes the results of a study on the dynamic response of pile foundations in liquefiable soils during strong shaking. The research covers mainly study of the modeling of liquefaction phenomenon and a critical study of physical modeling of pile-soil interaction. The liquefaction modeling for determining the liquefaction analysis. The pile-soil interaction is quantified using Winkler model. Finally a computer code in C++ has been developed to predict the behaviour of pile in liquefiable soils.