复合地基及组合基床在港珠澳大桥沉管隧道中的应用  

Application of composite foundation and foundation bed in immersed tube tunnel of Hong Kong-Zhuhai-Macao Bridge

作　　者：李建宇[1] 卢永昌[1] 林佑高[1] 何洪涛[1] LI Jian-yu;LU Yong-chang;LIN You-gao;HE Hong-tao(CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司

出　　处：《水运工程》2019年第9期273-278,共6页Port & Waterway Engineering

摘　　要：针对港珠澳大桥岛隧工程在外海、深水、厚软基地质条件下沉管隧道基础沉降及差异沉降控制技术问题,对传统桩基与复合地基方案进行对比,提出港珠澳沉管隧道采用PHC刚性桩、高喷柔性桩、挤密砂桩散体桩复合地基逐步过渡到天然地基的地基及抛石+碎石垄的组合基床方案。复合地基沉降计算分析及观测数据证明提出的新型复合地基及组合基床方案控制沉降及差异沉降的效果显著。提出沉管隧道基础沉降主要组成及复合地基建议的沉降计算方法,可为类似工程提供参考。To control the settlement and differential settlement of the tube tunnel foundation control under the geologic condition of open sea,deep water and thick & soft base for the Hong Kong-Zhuhai-Macao bridge tunnel engineering immersed tube tunnel, we carry out a comparison between the traditional pile foundation and the composite foundation,and propose the composite bed foundation scheme,which turns from the composite foundation of the PHC rigid pile,high jet grouting flexible pile,and sand compaction piles gradually to the natural foundation and composite foundation bed.The composite foundation settlement calculation analysis and observation data prove the remarkable effect of the composite foundation and composite foundation bed scheme for the control of the settlement and differential settlement. The composition of the tube tunnel ’ s foundation settlement and the recommended calculation method for the composite foundation are also given, which may serve as reference for similar projects.

关 键 词：刚性桩复合地基 高喷柔性桩复合地基 挤密砂桩散体桩复合地基 组合基床 沉降 差异沉降 

分 类 号：TU447[建筑科学—岩土工程] U6[建筑科学—土工工程]