点震源作用下天津市宝坻区域地震动谱元模拟  

Seismic Spectral Element Simulation of Near Fault in Baodi Area under the Action of Point Seismic Source

作　　者：赵瑞斌 程鹏[1] 张彦 李瑞源 ZHAO Ruibin;CHENG Peng;ZHANG Yan;LI Ruiyuan(School of Civil Engineering,TCU,Tianjin 300384,China;Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,TCU,Tianjin 300384,China)

机构地区：[1]天津城建大学土木工程学院,天津300384 [2]天津城建大学天津软土特性与工程环境重点实验室,天津300384

出　　处：《天津城建大学学报》2023年第3期177-186,共10页Journal of Tianjin Chengjian University

基　　金：国家自然科学基金(51878434);天津市杰出青年基金项目(19JCJQJC62900)。

摘　　要：随着宝坻区在京津冀一体化发展中的城区规模逐步扩大,偶然性地震对宝坻区带来的不利影响亟待研究.选取对宝坻区影响最大的宝坻断层为潜在震源,采用SPECFEM3D建立了包含震源的三维地质模型,研究覆盖层水平及垂直方向不均匀性耦合下的宝坻区域地震动效应,与DEEPSOIL一维非线性分析程序计算结果进行对比.数值分析结果表明:考虑水平方向不均匀性时的覆盖层场地对宝坻区域地震动响应的放大作用更加明显,各测点(峰值加速度)PGA、(峰值速度)PGV、(峰值位移)PGD的放大系数为0.9~4.0;DEEPSOIL程序计算得到的PGA比谱元法高20%,计算结果比谱元法PGD高6%;应用谱元法研究复杂三维场地地震动规律具有可行性.With the gradual expansion of the urban area of Baodi Area in the integrated development of Beijing-Tianjin-Hebei,the adverse effects brought about by occasional earthquakes on Baodi Area need to be studied urgently.The Baodi fault,which has the greatest impact on Baodi Area,is selected as a potential earthquake source,and a three-dimensional geological model containing the earthquake source is established using SPECFEM3D to study the effects of ground shaking in Baodi Area under the coupling of horizontal and vertical inhomogeneities of the overburden,and the results are compared with those calculated by the DEEPSOIL one-dimensional non-linear analysis program.The results of the numerical analysis show that:the amplification effect of the overburden site on the ground vibration response of Baodi region is more obvious when considering the horizontal inhomogeneity,and the amplification coefficients of(peak acceleration)PGA,(peak velocity)PGV and(peak displacement)PGD of each measurement point are 0.9-4;the PGA calculated by the DEEPSOIL program is 20%higher than that of the spectral element method,and the PGD is 6%higher.It is feasible to apply the spectral element method to study the ground vibration patterns of complex three-dimensional sites.

关 键 词：谱元法 宝坻断层 三维地质模型 水平不均匀性 场地效应 

分 类 号：P315.8[天文地球—地震学]