等芯劲性复合桩工作性状数值模拟研究  

Numerical Simulation Study on Working Properties of Strength Composite Piles with Equal-core

作　　者：陈廷柱 何碧娟 黄国俊 刘涛 盛强 朱锐 CHEN Tingzhu;HE Bijuan;HUANG Guojun;LIU Tao;SHENG Qiang;ZHU Rui(Nanjing Jiangbei Public Construction Engineering Co.,Ltd,Nanjing Jiangsu 211031 China;Nanjing Tech University,Nanjing Jiangsu 211816 China)

机构地区：[1]南京江北公用建设工程有限公司,江苏南京211031 [2]南京工业大学交通运输工程学院,江苏南京211816

出　　处：《江苏建筑》2023年第3期82-85,共4页Jiangsu Construction

基　　金：江苏省基础研究计划(自然科学基金)青年基金项目(BK20220356)。

摘　　要：等芯劲性复合桩作为一种在软土地区使用的新桩型,其工作性状尚不明晰。文章采用有限元软件建立等芯劲性复合桩三维有限元计算模型,系统分析等芯劲性复合桩工作性状。结果表明:等芯劲性复合桩内芯轴力沿深度不断衰减,外芯轴力沿深度呈缓慢增长的趋势;内界面与外界面的侧摩阻力随深度的加深缓慢增大,在靠近桩端处下降;内界面与外界面相对位移都在桩顶处较大;数值计算得到的荷载沉降曲线与实测曲线变化趋势基本相同;此外,实测与数值计算得到的等芯劲性复合桩承载力均高于规范设计值,表明等芯劲性复合桩在实际工程中具有较好的承载性能与沉降控制能力。研究成果可为劲性复合桩工程实践提供科学依据。As a new pile type used in soft soil area,the working behavior of the equal core composite pile is still unclear.The three-dimensional finite element calculation model of the composite pile with equal core stiffness is established by using the finite element software,and the working behavior of the composite pile with equal core stiffness is systematically analyzed.The results show that the internal axial force of the composite pile with equal core stiffness decreases continuously along the depth,while the external axial force increases slowly along the depth;The side friction of the inner and outer interfaces increases slowly with the depth,and decreases near the pile tip;The relative displacements of the inner and outer interfaces are larger at the pile top;The change trend of load settlement curve obtained by numerical calculation is basically the same as that measured;In addition,the bearing capacity of the composite pile with equal core stiffness obtained from the actual measurement and numerical calculation is higher than the design value in the code,indicating that the composite pile with equal core stiffness has better bearing capacity and settlement control capacity in practical projects.The research results can provide scientific basis for the engineering practice of stiffened composite piles.

关 键 词：劲性复合桩 侧摩阻力 单桩承载力 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]