港珠澳大桥工程人工岛三维非线性地震反应分析  

Three-dimensional nonlinear seismic response analysis of artificial island of Hong Kong-zhuhai-Macao Bridge Project

作　　者：闫静茹[1] 路德春[1] 杜修力[1] 袁勇[2] 刘洪洲[3] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]中交公路规划设计院有限公司,北京100088

出　　处：《世界地震工程》2016年第1期161-168,共8页World Earthquake Engineering

基　　金：国家973计划项目(2011CB013600);国家自然科学基金创新研究群体(51421005);"土木工程抗震减震"教育部创新团队计划资助

摘　　要：以港珠澳大桥工程人工岛为研究对象,采用动力有限元法模拟了地基-人工岛-海水系统三维地震反应。为计算土体的沉降变形,分析模型中回填土部分采用可以反映土体剪胀和应变软化特性的统一硬化模型进行模拟,对比分析了在水平单向、水平双向和三向输入地震荷载时,人工岛-地基系统加速度反应规律,以及人工岛地表峰值位移规律。研究结果表明,由于土与岛壁桩墙结构的动力相互作用,土体加速度放大系数以及地表沉降规律,均与地震动作用方向和人工岛长轴方向的夹角相关,多向地震作用时人工岛地表纵向地震反应大于横向地震反应,且在三向地震作用下地表差异沉降最显著,将引起桥梁与隧道连接处的非一致变形。Dynamic finite element method was employed to study the 3-D seismic response of the foundation-artificial island seawater system of the Hong Kong-Zhuhai-Macao Bridge. For calculating the settlement deformation of the soil,the backfilled soil of the model adopted unified hardening（ UH） model to describe the mechanical behaviors of soil body,including shear dilatancy and strain softening. Acceleration responses of artificial island-foundation system and the peak displacement of the island surface were studied for the cases subjected to unidirectional,bidirectional and multidirectional earthquake loading. The simulation results indicate that the seismic acceleration amplification coefficient of the soil body and the settlement of ground surface vary with the variation of the angle between earthquake direction and the long-axis direction of island due to seismic interaction of pile-soil structure. Under multidirectional seismic action,longitudinal seismic response of surface of the artificial island is larger than its transverse seismic response and the difference of surface sattlement is most obvious,it would cause nonuniform deformation at connetive place between bridge and tunnel.

关 键 词：人工岛 海洋成层土 三维有限元模型 地震反应 

分 类 号：TU359[建筑科学—结构工程]