路堤荷载下刚性桩复合地基稳定性计算  

Stability calculation of rigid pile composite foundation under embankment load

作　　者：熊传祥[1] 王艺霖[1] 陈福全[2] XIONG Chuanxiang;WANG Yilin;CHEN Fuquan(College of Environment and Resources, Fuzhou University, Fuzhou 350116, China;College of Civil Engineering, Fuzhou University, Fuzhou 350116, China)

机构地区：[1]福州大学环境与资源学院,福建福州350116 [2]福州大学土木工程学院,福建福州350116

出　　处：《中南大学学报（自然科学版）》2017年第10期2747-2754,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41272299)~~

摘　　要：通过Boussinesq公式的改进解,考虑土拱效应,计算合理的桩身被动荷载,并根据非线性地基反力法,求得桩身内力分布模式。在此基础上,结合刚性桩复合地基的失稳破坏模式,采用桩身抗弯强度控制路堤的整体稳定性,并将其换算得到的抗剪强度指标应用于极限平衡法中,得到一种以桩身内力计算为基础的路堤荷载下刚性桩复合地基稳定性计算方法。最后,将本文方法与三维数值模拟、传统的极限平衡法以及等效砂桩法等简化计算方法进行对比。研究结果表明:本文方法能有效反映路堤荷载下刚性桩复合地基失稳破坏的机理,得到较合理的路堤整体稳定安全系数。Considering soil arching effect,the reasonable passive load of rigid pile was deduced from the modified formula of Boussinesq,and the distribution of pile’s internal force could be drawn by nonlinear subgrade reaction method.Based on this,the allowable shear strength controlled by bending strength of pile was obtained,and then applied was to limit equilibrium method.Above all,a calculation method for stability of rigid pile composite foundation under embankment load was suggested based on calculation of pile internal force.Finally,a comparison was done among this mothod with3D numerical simulation method,traditional limit equilibrium method and the equivalent sand pile method.The results show that failure mechanisms of rigid pile composite foundation under embankment load can be effectively reflected and more reasonable safety factors of embankment can be obtained through the proposed method

关 键 词：刚性桩 复合地基 稳定性 弯曲破坏 被动荷载 桩身内力 

分 类 号：TG146.2[一般工业技术—材料科学与工程]