Study on seismic response difference of horizontal and inclined liquefied site-pile-structure

In recent years, many earthquake disasters have shown that the liquefaction side expansion of the soil in the inclined liquefaction site will increase the damage degree of pile, which will cause the failure of the superstructure. In this study, an efficient-finite element model is built for the shaking table test of the interaction of inclined liquefied site-pile group-superstructure. By comparing with the experimental results, the rationality of the model building method is proved. Based on the verified method, finite element models of typical horizontal and inclined liquefied site-pile group-superstructure interactions are built. Then, the dynamic response of the soil-pile group-superstructure system under different non-liquefiable crust thicknesses in horizontal and inclined liquefaction sites are analyzed, and the differences between the systems under the two sites are discussed. The calculation result indicate that the pore pressure ratio, pile displacement, soil displacement and pile curvature in horizontal and inclined sites decrease obviously with the thickness of the non-liquefiable crust increases. Compared with the horizontal site, the attenuation amplitude of the inclined site is more obvious. There is little difference in pore pressure and acceleration of soil in horizontal and inclined liquefaction sites under different non-liquefiable crust thicknesses. Compared with the horizontal site, the lateral expansion flow in the inclined site produces permanent lateral displacement, which increases the damage degree of the pile.