NUMERICAL SIMULATION OF LIQUEFACTION TYPE ROAD EMBANKMENT SLOPE UNDER SEISMIC LOADING

Seismic liquefaction problems of road embankment slope are involved in two different fields which are geotechnical engineering and engineering earthquake.Therefore,it’s a cross topic of slope engineering and sand liquefaction.By means of Finn constitutive model,the dynamical stability and liquefaction failure mechanics of road embankment slope which is made up of fill,sand soil and gravel soil under natural seismic loading are simulated with finite difference method.The following results are obtained.Firstly the deformation and failure of road embankment slope under seismic loading are caused by subgrade sand liquefaction which results in the effective stress decreasing rapidly.Secondly the accumulation and dissipation of pore water pressure not only related to earthquake record sequence,but also have a close relation with the position and depth of saturation sand.Thirdly the ground distortion and destruction mostly appears as two aspects which are seismic subsidence at the top of embankment and uplift at the base of slope.Lastly the under-ground deformation and failure principally include shear failure of slope soil mass and lateral spreading of the deep layer induced by sand liquefaction.