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点震源作用下三维沉积盆地地震动谱元模拟 被引量:8

Seismic spectral element simulation of three-dimensional sedimentary basin under the action of point seismic source
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摘要 基于高精度谱元法(SEM),以半空间中椭球形沉积盆地为例,研究了点震源作用下三维沉积盆地的地震响应。研究结果表明:沉积盆地对地震动幅值有显著的放大效应,对地震持时有明显的增长效应,地震动空间分布规律受控于震源频率和近断层倾角等因素。主要体现为以下几点:(1)震源函数主频率较高时,沉积盆地内部出现多个波峰波谷,局部聚焦增强,放大效应显著,如震源频率为2Hz时在沉积盆地中心位置的加速度峰值可达1Hz时的5.6倍;(2)随着断层倾角的增大,断层上盘效应逐渐减弱,地表加速度的峰值在逐渐减小,30°倾角断层沉积盆地中心的加速度达1.96m/s^2,是90°倾角断层加速度值的5.2倍;(3)震源频率和断层倾角对位移的影响没有对加速度的显著。 The ellipsoidal sedimentary basin in half space is studied based on the high-precision spectral element method(SEM)in this paper.The results of the study show that the sedimentary basin has significant amplification effects on the seismic dynamic amplitude and the ground motion duration,and spatial distribution regularities of seismic vibration are mainly influenced by the frequency of source,as well as fault inclinations,etc.In general,the research shows that:(1)when the main frequencies of the seismic source function are high,plurality peaks and valleys will be appeared inside the sedimentary basin,and the local focus will be enhanced and the amplification effects are remarkable.For example,when the focal frequency is 2Hz,the peak acceleration at the center of the sedimentary basin can reach 5.6 times of that at 1Hz;(2)with the increase of fault inclination,the upward disk effect of the fault is gradually weakening,and the peak surface acceleration is gradually decreasing.The acceleration in the center of the 30°dip fault sedimentary basin reaches 1.96 m/s^2,which is up to 5.2 times of the acceleration of the 90°dip fault;(3)the effect of seismic source frequency and fault inclinations on the displacement are not as significant as acceleration.
作者 刘中宪 苗岳云 陈頔 LIU Zhongxian;MIAO Yueyun;CHEN Di(Tianjin Key Laboratory of Civil Structure Protection and Reinforcing,Tianjin ChengjianUniversity,Tianjin 300384,China;Tianjin Institute of Earthquake Engineering,Tianjin 300384,China)
出处 《世界地震工程》 CSCD 北大核心 2020年第2期200-208,共9页 World Earthquake Engineering
基金 国家自然科学基金项目(51678390) 天津市应用基础与前沿研究计划重点项目(15JCZDJC39900)共同资助。
关键词 点震源作用 三维沉积盆地 近断层 谱元法 point seismic source effect three-dimensional sedimentary basin near-fault spectrum element method(SEM)
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