摘要

基于有限元软件建立干拌水泥碎石桩与软弱路基相互作用数值模型,研究干拌水泥碎石桩单桩承载力与桩身应力分布特征,并分析桩径、桩间距、成桩挤密作用、桩土间接触状态等因素对单桩承载力影响规律。结果表明:干拌水泥碎石桩桩身轴向压力沿深度方向递减;桩身侧摩阻力沿深度方向先减小后增大再减小,最大值出现在距桩端约1.3 m部位;成桩挤密作用对干拌水泥碎石桩单桩承载力影响不大;单桩承载力与地基土模量、路堤土模量和桩土间摩擦系数呈线性关系,且桩土间摩擦系数对单桩承载力影响效果显著。

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