软夹层土对福州盆地地表地震动特性的影响  

Effects of Soft Interlayer on Ground Surface Seismic Response of Fuzhou Basin

作　　者：金丹丹[1] 陈国兴[1] 董菲蕃[1] 

机构地区：[1]南京工业大学岩土工程研究所,南京210009

出　　处：《武汉理工大学学报》2012年第12期83-88,共6页Journal of Wuhan University of Technology

基　　金：国家科技支撑计划(2009BAK55B00)

摘　　要：以福州盆地为对象,基于ABAQUS有限元并行计算平台,建立二维非线性分析模型对地表地震动效应进行分析。结果表明,当输入地震动一定时,地表PGA随软弱层埋深变浅而增大,当埋深至一定深度时有减震作用;随软夹层埋深增加,地表加速度谱渐呈出多峰特征,特征周期增大;软夹层厚度对地表PGA影响与其埋深及输入地震动有关。Fuzhou Basin is selected for the research.Based on the explicit FE method and computing cluster platform of ABAQUS,a large-scale two-dimensional（2D） FE model for Fuzhou Basin is established.The results show that,for given input ground motion and peak acceleration,the peak values of ground motion acceleration（PGA） response and their amplification factors will be lessening when the depth of soft interlayer is increased,however,when the depth of soft interlayer exceeds a critical value,there is an obvious cushioning effect.With the growth of depth of soft interlayer,the ground acceleration response spectra of Fuzhou Basin gradually appear a double-peak or multi-peak phenomenon and the corresponding feature period increases.The effect of thickness of soft interlayer on the seismic response is related to its depth and the input ground motion characteristics.

关 键 词：盆地地震效应 大尺度二维分析 地表地震动特性 地表加速度谱谱比 软夹层 厚度 埋深 

分 类 号：TU443[建筑科学—岩土工程]