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以安徽省滁州市地震小区划场地为研究对象,基于ABAQUS显式有限元并行计算平台,采用大尺度二维精细化有限元非线性分析方法,研究了局部地质条件差异对场地地震效应的影响。结果表明:该场地地震动放大效应明显,河漫滩地表PGA放大效应尤为显著;相比一级阶地,河漫滩地表加速度反应谱谱形加宽,谱峰向长周期方向移动,移动幅度约为0.05~0.25s,相应的特征周期增大。地表加速度反应谱呈双峰甚至多峰特征,大尺度场地非线性有限元分析能定性反映出局部地质条件对场地地震效应特性的影响,可为城市地震小区划提供更为合理的科学依据。
Taking the plot area of Chuzhou earthquake in Anhui Province as the research object, based on ABAQUS explicit finite element parallel computing platform, large-scale two-dimensional finite element method of nonlinear finite element analysis was used to study the influence of local geological conditions on the earthquake effect of the site. The results show that the amplifying effect of ground motion is obvious and the PGA amplification effect is particularly significant. The surface acceleration response spectrum of river floodplain broadens and the peak shifts to long period, s, the corresponding characteristic period increases. The surface acceleration response spectrum has bimodal and even multi-peak characteristics. The nonlinear finite element analysis of large scale sites can qualitatively reflect the influence of local geological conditions on the seismic effect characteristics of the site, which can provide a more reasonable scientific basis for the urban zoning.