静压群桩挤土效应对邻近既有码头桩基影响数值分析  

Numerical Analysis of the Influence of Static Pressure Pile Group Squeezing Effect on Pile Foundation of Adjacent Existing Wharf

作　　者：杜文博 谢伟 王滨 倪卫达 沈侃敏 高广运[4] Du Wenbo;Xie Wei;Wang Bin;Ni Weida;Shen Kanmin;Gao Guangyun(POWERCHINA Huadong Engineering Corporation Limited,Hangzhou 310030,China;College of Engineering,Ocean University of China,Qingdao 266100,China;College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;College of Civil Engineering Tongji University,Shanghai 200092,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州310030 [2]中国海洋大学工程学院,山东青岛266100 [3]中国海洋大学环境科学与工程学院,山东青岛266100 [4]同济大学土木工程学院,上海200092

出　　处：《中国海洋大学学报（自然科学版）》2024年第9期141-147,共7页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(42277130)资助。

摘　　要：为研究软土地区静压群桩对周边建构筑物的不利影响,本文以浙江某近海光伏发电项目为背景,利用圆孔扩张法模拟沉桩挤土效应,基于硬化土(Hardening soil,HS)本构模型,建立了桩-土、桩-桩相互作用三维有限元模型,据此分析并探讨了沉桩顺序及遮栏效应对邻近既有桩基础的影响。结果表明,当不考虑沉桩顺序及遮拦效应时,既有桩基础最大变形为6.09 mm,桩基均处于弹性状态;当考虑沉桩顺序及遮栏效应后,群桩左侧土体位移有所减小。既有桩变形和内力均易受沉桩顺序和沉桩相对位置关系因素的影响,工程设计和施工应对沉桩顺序给予足够重视,对于本项目建议以沉桩顺序为逐排压桩顺序。In order to investigate the adverse effects of static pressure pile groups on surrounding buildings and structures in soft soil areas,based on a photovoltaic power generation project in Zhejiang province as an example,the cylindrical cavity expansion method is used to simulate the effect of pile driving,and the hardening soil(HS)constitutive model is used for the soil to establish a three-dimensional finite element model of pile-soil and pile-pile interaction.The influences of piling sequence and compacting effect on the adjacent existing pier foundation are analyzed.The results show that the maximum deformation of the adjacent existing pile foundation is 6.09 mm when piling sequence and compacting effect are ignored,and the pier pile foundation is in an elastic state.After considering the piling sequence and compacting effect,the soil displacement on the left side of the pile group is reduced.The deformation and internal force of existing piles are easily affected by factors such as the pile sinking sequence and the relative position of the pile sinking,which should pay sufficient attention in engineering design and construction.It is recommended that the pile sinking sequence be sequential pile pressing without changing the direction row by row in this project.

关 键 词：静压沉桩 圆孔扩张法 硬化土模型 沉桩顺序 遮拦效应 

分 类 号：TU43[建筑科学—岩土工程]