Nonlinear Seismic Response Analysis of Two-dimensional Depositional Basins
Near fault seismic motion can lead to significant seismic disasters in the near field area,particularly in regions with sedi-mentary terrain,exacerbating the potential disaster.In this paper,ABAQUS software and secondary development platform are em-ployed to compile VUMAT subroutine based on Davidenkov skeleton curve,to conduct nonlinear simulation of saturated sedimentary basin,and to establish two-dimensional T-shaped Sedimentary basin with different bedrock surface slopes.Four near fault Seismic wave with different spectral characteristics are selected to input the site with different amplitudes,and the nonlinear response of the site under the action of different basin slopes and seismic wave intensities is studied.It is found that seismic wave can cause liquefaction in satur-ated sedimentary basin.The greater the strength of seismic wave is,the wider the distribution range of liquefaction area is,and perman-ent plastic deformation occurs on the surface;The increase of seismic wave strength can lead to the advance of liquefaction time of sur-face soil layer,and the liquefaction of subsoil will weaken the propagation strength of Seismic wave,resulting in the delay of liquefac-tion time of upper surface soil layer.As the bedrock surface slope increases,the most vulnerable location on the basin's surface shifts to-ward the center.Furthermore,the amplification coefficient of peak velocity ranges from 1.18 to 3.33 under various working conditions.
万方数据
维普
