Numerical Analysis For Pile Damage Under The Lateral Displacement Induced By Seismic Liquefaction

Earthquake is one of the worst natural disasters that mankind is facing today. Through the past survey of earthquake damages, it is found that a greater displacement will come into being after soil liquefaction caused by earthquake which produces a huge internal force and displacement to pile, making it destroyed. Previous studies in earthquake liquefaction are focused on the mechanism, conditions, factors and evaluation of the possibility of liquefaction. And research on displacement of soil mass and impact on pile after earthquake liquefaction is not in depth.ABAQUS is one of the most powerful general-purpose finite element analysis software in the world, containing a wealth of unit modes, material models and analysis processes. It has an excellent ability to solve nonlinear problems and a strong applicability for geotechnical engineering.In this paper, the finite element analysis software ABAQUS is applied to research pile destruction under the role of lateral effect in the sites of earthquake liquefaction with the method--numerical analysis. The study includes two aspects:The first one is the calculation of venue sway caused by earthquake liquefaction. Based on the finite element analysis software ABAQUS and Duncan-Chang model, large displacement of the ground caused by seismic liquefaction is analyzed through nonlinear finite element and compared with the results calculated by empirical formula. Also, the calculation results coincided with earthquake damage by studying possible factors of the effect produced from earthquake intensity, ground slope to ground under earthquake liquefaction. Based on the above research and comparison, displacement mode suitable for the variation of liquefaction soil displacement with depth of soil is put forward, which provides a calculation basis for study the pile failure under the lateral displacement role of liquefied sites.The second is the study on pile failure caused by liquefied ground sway effect. Taking into account the nonlinear of pile-soil interaction and by changing the soil lateral displacement, thickness of the overlying non-liquefied layer, pile’s top load, setting the pile cap, we research the pile damage and get the calculation results coincided with earthquake damage. The research can provide a reliable basis for the subsequent pile design.