Research On Dynamic Response Of Pile-soil Interaction Under The Large Ground Displacement Induced By Eearthquake Liquefaction

The large ground displacement induced by liquefaction of earthquake may result in serious damages to the life engineering such as highway,bridge and pile foundation. Liquefaction mechanism of large deformation and impact of these factors were complicated, and it had become a hot and big probloem in the geotech- nical engineering and earthquake engineering. The current research was supported by the National Science Foundation project of the shaking table test of pile-soil- structure interaction (No.40772171),calculated and analyzed the dynamic response of pile-soil interaction under the Large Ground Displacement induced by Eearth- quake Liquefaction by FLAC3D based on the model of the shaking table test.The design and production of the shaking table test is described in this paper,including the experimental model,the model material performance parameter,the experimental increase system. And it provided the necessary parameters to simulate and verify the shaking table model experiment by FLAC3D. This article made some improvements in the calculation model on the basis of the shaking test model,in order to have a free surface site models to better respond to large deformation under seismic liquefaction. We found that where near the free face significantly had a greater displacement,and with increasing distance from the free face,there is less displacement.In this paper,the revised model with a free face space was calculated with FLAC3D. That focused on the distribution of pore water pressure under the large ground displacement induced by earthquake liquefaction,and found that liquefied soil had a certain vibration isolation effect with the transmission of seismic waves. Through the analysis of displacement,moment and strain response of the pile foundation,this paper found the pile where are the junction of soft and hard soil, and liquefied soil,would have cracks and damage,with the test results and previous observations of the earthquake damage investigation in the pile. In the presence of liquid-side expansion foundation,pile foundation must consider not only the upper part of the structure of vibration,and also the impact of lateral displacement of the subsoil,this paper has a certain reference value to the seismic design of pile foundation in the high-intensity earthquake zone.