基于数值模拟的风化层单桩承载特性研究

Study on load bearing characteristics of mudstone weathered pile foundation based on numerical simulation analysis

为了探究风化层中桩基承载特性,采用数值模拟技术建立了桩-土离散单元模型,对单桩的承载特性以及桩周土的细观力学行为进行了分析。结果表明单桩与周围土体之间存在复杂的相互作用,利用数值仿真计算可以得到桩周土的位移场和应力分布特征;在荷载增加过程中,土体发生剪胀效应和应力集中,导致单桩承载性能衰减;单桩的承载性能随桩径增大而明显提高;桩周土的压缩系数在沉降值超过6 mm时发生突变,计算结果对于预测土体变形特性具有一定的指导意义。数值模拟结果为风化层中桩基的承载性能分析提供了理论支持。

Through numerical simulation technology,a pile-soil discrete element model is established to investigate the load bearing characteristics of a single pile in mudstone regolith.The analysis of the micromechanical behavior of the soil around the pile reveals a complex interaction between the single pile and its surrounding soil,as evidenced by the obtained displacement field and stress distribution characteristics.It is observed that during load increase,there is a dilatancy effect and stress concentration in the soil around the pile,leading to an attenuation of its bearing capacity.Furthermore,it is found that an increase in pile diameter significantly enhances the bearing capacity of a single pile.Additionally,abrupt changes in compression coefficient are noted when settlement values exceed 6 mm,providing valuable insights for predicting soil deformation characteristics.These numerical simulation results offer theoretical support for analyzing the bearing capacity of mudstone regolith foundation piles.