摘要
为研究黏土中螺旋桩倾斜单桩的水平承载性能,基于非线性有限元软件ABAQUS建立有限元分析模型.通过数值模拟结果与已有螺旋桩软土地基抗拔试验及砂土地基水平承载试验的对比分析,验证了该数值模型的准确性与可行性.探讨了不同倾斜角度下叶片数量和首层叶片埋深对螺旋桩水平承载性能的影响规律.结果表明:叶片数量对倾斜螺旋桩的水平承载性能影响不大;倾斜角度增大,首层叶片埋深影响逐渐变小,但总体上首层叶片埋深越深,倾斜螺旋桩的水平承载性能越差,当埋深达到4倍叶片直径的深度后,水平承载性能基本不再变化.基于数值模拟结果提出了不同倾斜角度下螺旋桩水平极限承载力计算中锚片所承担部分的计算公式.随着倾斜角度增加,叶片在螺旋桩中的抗倾覆作用逐渐向抗拔作用转变,所提出的水平极限承载力计算公式较为可靠.
To study the horizontal bearing capacity of single inclined helical pile in clay,a finite element analysis model was established based on the nonlinear finite element software ABAQUS.The correctness and feasibility of the numerical model were verified by comparing the numerical simulation results with the existing uplift test results of the helical pile in soft soil foundation and the horizontal bearing test ones in sand.The effects of the number of blades and the buried depth of the first layer of blades on the horizontal bearing capacity of helical pile under different inclined angles were discussed.The results show that the number of blades has little effect on the horizontal bearing capacity of the inclined helical pile.With the increase of the inclination angle,the effect of the burial depth of the first blade gradually decreases.However,in general,the deeper the blades of the first layer,the worse the horizontal bearing capacity of the inclined helical pile.When the burial depth reaches 4 times of blade diameter,the horizontal bearing capacity of the inclined helical pile basically does not change.Based on the numerical simulation results,the calculation formula of the part of the anchor plate in the calculation of the ultimate horizontal bearing capacity of helical pile under different inclined angles was proposed.With the increase of the inclination angle,the anti-overturning effect of the blade in the helical pile gradually changes to the anti-pulling effect.The calculation formula of the horizontal ultimate bearing capacity is reliable.
作者
韦芳芳
邵盛
陈道申
徐庆鹏
邹本为
孔纲强
Wei Fangfang;Shao Sheng;Chen Daoshen;Xu Qingpeng;Zou Benwei;Kong Gangqiang(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Anhui Huadian Engineering Consultating and Design Co.,Ltd.,Hefei 230022,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第3期463-472,共10页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51608168)
河海大学中央高校基本科研业务费资助项目(B200202091).
关键词
螺旋桩
倾斜角度
承载性能
有限元分析
helical pile
inclination angle
bearing performance
finite-element analysis
