挡土抗拔桩倾斜荷载承载特性试验与数值分析  

Bearing characteristic experiment of inclined load of soil retaining pile and numerical analysis

作　　者：袁海平[1] 李艳龙 李恒喆 YUAN Haiping;LI Yanlong;LI Hengzhe(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2024年第12期1686-1692,共7页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51874112)。

摘　　要：为研究挡土抗拔桩承受不同角度倾斜上拔荷载的极限承载力,文章通过室内相似模拟试验,获取单桩荷载-桩顶位移曲线;在试验得到的参数与FLAC 3D软件数值模拟结果近似一致的基础上,进一步探讨荷载倾角对挡土抗拔桩极限承载力的影响以及桩侧摩阻力分布、荷载传递性状和桩侧摩阻力发挥特性等。结果表明:挡土抗拔桩的荷载-桩顶位移曲线呈陡变型,极限承载力增大幅度随着荷载倾角的减小而减小;倾斜荷载下由于桩侧摩阻力的存在,上拔力分量随着水平力分量的增大而增大;挡土抗拔桩极限承载力大小较等截面桩不同倾角荷载作用下均有较大提升。该研究成果对挡土抗拔桩的设计和计算具有一定的参考价值,可利用其承载力特性应用于工程实际。In order to investigate the ultimate bearing capacity of soil retaining pile under the inclined pull-up load at different angles,the load-top displacement curve of the pile was obtained through the indoor similar simulation test.Based on the consistency between the experimental parameters and the numerical simulation results of the FLAC 3D software,the influence of the load inclination on the ultimate bearing capacity of the soil retaining pile,the distribution of the pile side friction resistance,the load-transferring behavior and the characteristics of the pile side friction resistance were further discussed.The results indicate that the load-top displacement curve of soil retaining pile presents a steep type,and the increase in the ultimate bearing capacity decreases with the fall of the inclination of the load.Due to the existence of the pile side friction resistance,the component of the pull-up load increases with the rise of the component of the horizontal force under the inclined load.The ultimate bearing capacity of soil retaining pile increases vastly compared with that of the constant section pile under the action of different load inclinations.The research results have a specific reference value for the design and calculation of soil retaining pile,which can be applied to engineering practice.

关 键 词：挡土抗拔桩 倾斜荷载 室内相似模拟试验 数值分析 作用机制 

分 类 号：TU473.11[建筑科学—结构工程]