长江科学院院报2017，Vol.34Issue(9)：79-85,103,8.DOI:10.11988/ckyyb.20160616
围堤填筑对深厚软土地基既有群桩基础的影响研究
Numerical Analysis of New Embankment Filling on Existing PileGroup Foundation in Deep Soft Soil Area
摘要
Abstract
Under large-area loading around existed pile group foundation,the pile shaft was not only loaded by negative friction,but also by extra horizontal force.With the pile group foundation of bridge passing through deep soft soil in a newly built cofferdam project for example,a 3-D finite element model was established to simulate the loading process.The simulation results indicate 1) large-area loading has negative effect on the pile foundation,and the effect is significantly dominated by pile-soil friction coefficient which is different to be determined in actual engineering;the pile-soil friction coefficient in the study case was determined in the range of 0.2-0.3 through comparison between negative friction around pile foundation in numerical simulation and standard lateral friction resistance of foundation soil in in-situ test;2) negative friction around pile foundation can be generated by the filling materials,hence increasing the axial force of pile foundation,yet with no damage;3) filling symmetrically and evenly could alleviate to the largest extent the uneven settlement of pile foundation and confine the horizontal diffusion of additional loads to the deeper soil;the influence on the bending moment of pile shaft can also be controlled;4) due to the difference in spatial distribution of pile group,the compatibility of pile-soil deformation below the same cushion cap induced by the additional loads is different,hence the safety monitoring for bridge pile should be targeted.关键词
围堤填筑/大面积堆载/软土地基/群桩基础/负摩阻力/三维有限元Key words
embankment filling/large-area loading/soft soil foundation/pile group foundation/negative friction/3D finite element分类
建筑与水利引用本文复制引用
江洎洧,付少兰,潘家军,徐晗..围堤填筑对深厚软土地基既有群桩基础的影响研究[J].长江科学院院报,2017,34(9):79-85,103,8.基金项目
国家自然科学基金项目(51409011) （51409011）
中央级科研院所基本科研业务费项目(CKSF2014057/YT) （CKSF2014057/YT）
