港珠澳大桥工程人工岛三维非线性地震反应分析

发布时间：2018-06-12 02:25

本文选题：人工岛 + 海洋成层土　；参考：《世界地震工程》2016年01期

【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。
[Abstract]:Taking the artificial island of HongKong-Zhuhai-Macao Bridge as the research object, the dynamic finite element method is used to simulate the three-dimensional seismic response of the ground-artificial island-seawater system. In order to calculate the settlement and deformation of soil, the backfill part of the analytical model is simulated by the unified hardening model, which can reflect the characteristics of shear expansion and strain softening of the soil, and the horizontal unidirectional, horizontal bidirectional and triaxial seismic loads are compared and analyzed. The law of acceleration response of artificial island-foundation system and the law of peak displacement of artificial island surface. The results show that because of the dynamic interaction between soil and pile wall structure, the acceleration magnification factor of soil and the law of surface settlement are all related to the angle between the direction of ground motion and the direction of long axis of artificial island. The longitudinal seismic response of artificial island is greater than that of transverse earthquake under the action of multi-direction earthquake, and the surface differential settlement is most significant under the action of three-direction earthquake, which will cause the non-uniform deformation at the junction of bridge and tunnel.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;同济大学岩土及地下工程教育部重点实验室;中交公路规划设计院有限公司;
【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
【分类号】：P756.8;TU435

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