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基于圆孔扩张理论的静压楔形桩沉桩挤土效应研究

, PP. 24-30

Keywords: 道路工程,扩底楔形桩,圆孔扩张理论,沉桩阻力,挤土位移,超静孔隙水压

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Abstract:

?针对扩底楔形桩沉桩挤土效应特性方面的研究相对较少的状况,基于圆孔扩张理论,考虑扩底楔形桩的楔形角和扩大头等截面尺寸变化,建立扩底楔形桩施工中静压沉桩过程中沉桩阻力、桩周土体位移场以及超静孔隙水压力的理论计算方法。通过对楔形桩沉桩模型试验与理论分析的对比,分析了楔形角、沉桩深度、土体参数等因素对沉桩阻力、桩周挤土效应的影响规律。研究结果表明:所建立的理论计算方法能够较好的模拟楔形桩沉桩过程;沉桩完毕后侧摩阻力和桩端阻力之比在2~4之间,土体径向位移在距桩中心距离约为10倍桩径处递减为0。

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