摘要
为提升竖向及横向荷载耦合作用下超长桩基承载特性,本文通过ABAQUS有限元数值模拟,系统分析单桩桩身轴力、桩侧摩阻力及桩身截面弯矩变化规律。结果表明,随着竖向荷载的增加,桩侧摩阻力最大值不断增加。水平荷载对桩侧摩阻力影响不显著;竖向荷载对桩身截面弯矩影响较小。桩身截面正弯矩随桩埋深的增加先快速增加后快速降低至负弯矩。当桩深超过14.8m时,随着桩端持力层与桩周土弹性模量比的增加,桩身轴力不断增加,且差异性随桩埋深增加愈加显著。超长桩桩身轴力、桩侧摩阻力及桩身截面弯矩最大值发生在靠近桩顶位置,故应对桩上部土层进行加固补强。
To enhance the bearing characteristics of ultra-long pile foundations under the coupling of vertical and lateral loads,this paper systematically analyzes the variation laws of the axial force of a single pile body,the lateral frictional resistance of the pile,and the bending moment of the pile body section through ABAQUS finite element numerical simulation.The results show that with the increase of the vertical load,the maximum value of the lateral frictional resistance of the pile keeps increasing.The horizontal load has no significant influence on the lateral frictional resistance of the pile.The vertical load has a relatively small influence on the bending moment of the pile shaft section.The positive bending moment of the pile body section first increases rapidly and then decreases rapidly to the negative bending moment with the increase of the pile burial depth.When the pile depth exceeds 14.8m,with the increase of the ratio of the elastic modulus of the bearing stratum at the pile tip to the soil around the pile,the axial force of the pile body keeps increasing,and the difference becomes more significant with the increase of the pile burial depth.The maximum axial force of the super-long pile body,the lateral frictional resistance of the pile and the bending moment of the pile body section occur near the top of the pile.Therefore,the soil layer above the pile should be reinforced and strengthened.
作者
蒋培骏
JIANG Peijun(Ningbo Jiaojian Engineering Supervision and Consulting Co.,Ltd.)
出处
《广东建材》
2025年第6期119-122,共4页
Guangdong Building Materials
关键词
桩基础
仿真模拟
竖向荷载
水平荷载
力学特性
Pile foundation
Simulation
Vertical load
Horizontal load
Mechanical properties
