地震波斜入射下桩承式加筋路基动力响应分析  

Dynamic Response Analysis of Geosynthetic Reinforced and Pile Supported Embankment under Oblique Incident Wave

作　　者：郜新军[1] 李晓伟 郭院成[1] 王非[1] 

机构地区：[1]郑州大学土木工程学院,郑州市450001 [2]连霍郑洛段改建工程项目部,郑州市450000

出　　处：《公路》2018年第1期1-5,共5页Highway

基　　金：国家自然科学基金青年基金项目,项目编号41602297;高等学校博士学科点专项科研基金资助项目,项目编号20134101120009;河南省教育厅科学技术研究重点资助项目,项目编号14A560014

摘　　要：为了研究地震荷载作用下桩承式加筋路基的动力特性,基于显式有限元法结合黏弹性人工边界的时域波动分析方法,建立了三维地震SV波斜入射的输入方法。采用所建立的斜入射输入方法,研究了地震波斜入射作用下桩承式加筋路基地震反应规律。计算结果表明：与垂直入射相比,SV波倾斜入射可显著减小对路基抗震安全性起控制作用部位的位移、速度、加速度动力反应;加筋体的存在,可在一定程度上缓解地震荷载的冲击;同时,加筋层数、土工格栅的模量也对路基的抗震性能有很大的影响。In order to study the dynamic characteristics of geosynthetic reinforced and pile supported （GRPS） embankment under seismic loads, a three-dimensional seismic SV wave oblique incident input method is established by coupling the explicit finite element method with the viscous-spring artificial boundary condition. The seismic response laws of GRPS embankment under the oblique incidence of seismic waves are studied based the above method. The numerical results indicate that in comparison with vertical incidence, oblique incidence of seismic SV-waves may cause significant decreases in the factors of displacement, velocity and acceleration at the key locations of the GRPS embankment. The existence of geosynthetics can alleviate the impact of seismic load to a certain degree. Simultaneously, reinforced layers and modulus geogrid also have a great impact on the seismic performance of GRPS embankment.

关 键 词：桩承式加筋路基 地震波斜入射 显式有限元 动力响应 

分 类 号：U416.1[交通运输工程—道路与铁道工程]