基于理想场地模型的不同位置软夹层对场地地震反应的影响研究  

Influence of Soft Interlayer at Different Depth on Seismic Site Response Based on Ideal Site Model

作　　者：王竞 王世元[1] 潘勇杰 宴金旭 WANG Jing;WANG Shiyuan;PAN Yongjie;YAN Jinxu(Sichuan Earthquake Agency,Chengdu 610041,China)

机构地区：[1]四川省地震局,四川成都610041

出　　处：《防灾科技学院学报》2022年第1期33-41,共9页Journal of Institute of Disaster Prevention

基　　金：四川省地震局地震科技专项(LY2109);国家重点研发计划(2020YFC1511705-02)。

摘　　要：为了研究不同位置软夹层对场地地震反应的具体影响,找到土层反应变化的分界点。采用理想场地作为基础研究模型,改变软土层所在位置得到相关计算模型,通过土层反应分析探究不同位置软夹层对场地地表加速度峰值、放大系数、等效剪切波速计算值的影响。研究结果表明: 软弱夹层对场地表现为先放大后缩小的效应;四类场地的传播能力有一定范围;等效剪切波速不能反映土层结构的不同等相关结论,为实际工程场地应用中更合理的进行场地分类,明确软夹层所处位置对震害的影响及西昌实验场的建立提供理论基础。In order to study the influence of soft interlayer at different positions on seismic site response,found the point of soil layer response change.Based on the ideal site model,we change the location of the soft soil layer to obtain the relevant calculation model,study the effect of the different depth of the soft soil layer in the four types of sites on the peak surface acceleration and the amplification factor of the site surface and the equivalent shear wave velocity.Through research and analysis,we found the effect of weak interlayer on the site is first enlarged and then reduced,the equivalent shear wave velocity can t reflect the difference of soil structure and so on.This research could provid a theoretical basis for making reasonable site classification applied in actual engineering site,clarifying the effect of the depth of the soft interlayer on earthquake damage and establishing the Xichang experimental field.

关 键 词：场地分类 软夹层 场地地震反应 加速度峰值 深厚土层 

分 类 号：TU435[建筑科学—岩土工程]