STUDY ON LATERAL SPREADING OF LIQUEFIABLE AND INCLINED GROUND UNDER EARTHQUAKE

Earthquake can trigger post-liquefaction large deformation of saturated sand field, including seismic subsidence which can cause building ground uneven settlement, lateral spreading, resulting in the damage of pile foundations and buried pipelines. With reference to the centrifuge test, this paper is based on the finite element platform of OpenSees, by employing a bounding surface plasticity constitutive suitable for soil liquefaction deformation. The corresponding three-dimensional free field model is simplified into a shear beam. And the influence of different factors on ground lateral deformation is compared and analyzed, including ground inclination, relative density, different seismic wave characteristics and peak acceleration etc. The results show that pulse characteristics of near-fault ground motions cause the time history curves of ground lateral displacement presents certain pulse characteristics, and the effect on the accumulation of pore pressure should not be ignored; the increase of seismic peak acceleration and ground inclination will eventually cause the ground residual displacement value augment; the calcaulation of ground residual displacement is influenced strongly by the realitive density of sand, the more dense sand, smaller the ground lateral displacement is.