Proceedings home preface contents authors keywords copyright reference ©2012 Civil-Comp Ltd				Paper 293 Soil-Pile Interaction in Deep Layered Marine Sediment subject to Seismic Excitation T.P. Peiris1, D. Thambiratnam1, N. Perera2 and C. Gallage1 1Science and Engineering Faculty, Queensland University of Technology, Australia 2RobertBirdGroup, Australia Keywords: soil-pile interaction, vibration sensitive soil, finite element technique. full paper (pdf) - reference Dynamic soil-pile interaction analysis has become an important field in civil engineering during recent years. Several major earthquakes that caused damage to buildings and other infrastructure have brought attention to the response of piled foundations subjected to dynamic loading. In the past, many studies have been carried out in the area of soil-pile interaction using different tools available for such analysis problems such as the Winkler method and the finite element method. Different researchers have considered different complexities of the problem, by considering slipping and gapping between soil and pile, damping and nonlinear behaviour of soil. However, most of that research was focused on homogeneous soil profiles with limited depths of the piles and some of the research has addressed the issue of soil liquefaction [1,2]. However, seismic design of pileed foundations still remains challenging in situations, where piles are embedded in multilayered vibration sensitive soil profiles which are typically found in estuaries or in areas of deposits and marine regions, as a result of the lack of knowledge on the dynamic interaction between soil and pile for the case of an earthquake. The aim the research in this paper is to: analyse piled foundations embedded in multilayered deep profile soil strata comprised of soft soils when subjected to seismic excitation; to simulate the pile response; and to determine the action effects for the design of the piled foundations. In this paper a comprehensive finite element model was developed to model the soil-pile interaction behaviour subject to seismic excitation and the modelling techniques were validated with information found in the literature. As a preliminary study a soil profile in a marine environment was used to investigate the soil-pile interaction behaviour in a deep multilayered soil profile which has a considerable depth of soft soil layer at the top. This showed that the pile response depends highly on the properties of the surrounding soil and also can have different deflection modes. References 1 K.J. Bentley, M.H.E. Naggar, "Numerical Analysis of Kinematic Response of Single Pile", Canadian Geotechnical Journal, 37(6), 1368-1382, 2000. 2 B.K. Maheshwari, K.Z. Truman, M.H.E. Naggar, P.L. Gould, "Three-Dimensional Finite Element Nonlinear Dynamic Analysis of Pile Groups for Lateral Transient and Seismic Excitations", Canadian Geotechnical Journal, 41(1), 118-133, 2004.