软土固结的负摩阻力对斜顶桩接岸结构影响  

The effect of negative skin friction caused by consolidation of soft soil on inclined pile link-banked structure

作　　者：徐大彬 蓝妹元 王煌 李子晗 冯章 XU Dabin;LAN Meiyuan;WANG Huang;LI Zihan;FENGZhang(First Room of River and Lake Management,Water Environment and Urban Construction Engineering Branch of Power China Chengdu Engineering Corporation Limited,Chengdu 610000,China;Water Environment Engineering Institute,Nanning Branch Office of Shenzhen Water Planning&Design Institute CO.,LTD,Nanning 530000,China;Water Engineering Institute,Shenzhen Water Planning&Design Institute CO.,LTD,Shenzhen 518000,China)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司水环境与城建工程分公司河湖治理一室,成都610000 [2]深圳市水务规划设计院股份有限公司南宁分公司水环境工程所,南宁530000 [3]深圳市水务规划设计院股份有限公司水务工程院,广东深圳518000

出　　处：《水科学与工程技术》2020年第3期6-11,共6页Water Sciences and Engineering Technology

摘　　要：上海洋山港高桩码头后方挡土结构采用斜顶桩接岸结构,目前软土固结对该结构的负摩阻力影响研究仍较缺乏。为对我国今后深水建港积累经验,采用有限元仿真技术,以洋山港一期工程斜顶桩接岸结构作为原型,分析施工期抛填成陆后各桩负摩阻力随软土固结发展的规律,并以原型观测数据验证了数模结果。研究结果表明:软土固结导致桩周土体发生相对桩基的竖向位移,在各桩表面产生负摩阻力,且软土固结主要发生于主固结阶段。在该阶段内,负摩阻力的发展具有时间效应,会在桩基表面形成下拉荷载,其对板桩、支撑桩的影响更大,建议采取多种措施削弱负摩阻力的不利影响。Inclined pile link-banked structure is used as a kind of retaining structure behind the high-piled wharf in Shanghai YangShan harbor.At present,there is little research about the effect of negative skin friction caused by consolidation of soft soil on this structure.In order to accumulate experience in China’s deep-water harbor construction in the future,in this paper,the finite element simulation technique is used to simulate the YangShan harbor phase I project,which is took as the prototype.Then the law of the development of negative skin friction over each pile is analyzed after the construction of the land,and the numerical result is verified by the prototype observation data.The results show that the relative vertical displacement is caused by the soft soil around piles because of consolidation,so that the negative skin friction appears on piles’surface.Besides,consolidation of soft soil is mainly completed in the main consolidation stage.During this stage,the development of negative skin friction presents the time effect,and it will form a downward load on the surface of each pile,which has a greater effect on the sheet pile and the supporting pile.It is suggested that various measures should be taken to weaken the adverse effects of negative skin friction.

关 键 词：斜顶桩接岸结构 固结 负摩阻力 有限元仿真 原型观测 

分 类 号：TV92[水利工程—水利水电工程]