DYNAMIC ANALYSIS OF PILE GROUPS HAVING DIFFERENT CONFIGURATION IN LIQUEFIABLE SOIL

Abstract

Earthquake induced liquefaction is a common phenomenon. Many major earthquakes have witnessed great loss of structure and life due to its association with liquefaction. Various case studies on consequences and remedial measures of liquefaction have been reviewed. The failure mainly depends on soil-structure interaction. Piled foundations are often adopted as a foundation solution in potentially liquefiable soils. Soil liquefaction is one of the major factors affecting the behaviour of piles founded in seismically active areas. This report presents a numerical model of pile group to simulate liquefiable soil followed by a parametric study based on the following parameters: varying ground motion (triggering condition), varying depth of liquefiable layers, configurations of pile group. This provides a useful aid for the design of foundation in seismically active zones. The maximum bending moment is obtained at the interface between liquefiable and nonliquefiable layers. Higher displacement and bending moment values are observed for seismic motions of higher bed rock level acceleration. The effect of variation of configuration of pike groups has also been studied based on dynamic stiffness