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楔形桩是一种可以有效发挥桩侧摩阻力,提高单位材料利用率的纵向变截面异形桩;然而针对其沉桩施工过程的研究却相对较少。基于PFC数值分析软件,建立楔形桩沉桩施工过程模拟的数值模型;为了对比分析,建立等体积混凝土用量的常规等截面桩沉桩施工过程模拟的数值模型;通过与楔形桩和等截面桩沉桩模型试验及圆孔扩张理论计算结果的对比分析,验证了本文所建立的数值模型的准确性和可靠性;系统对比分析楔形桩沉桩过程中桩周土体位移场、应力场以及沉桩阻力等变化规律。研究结果表明:楔形桩静压沉桩效应与等截面桩沉桩效应规律基本类似;本文数值模型条件下,楔形桩静压沉桩施工桩端阻力、桩侧摩阻力和整体沉桩阻力分别是等截面桩的1.0倍、1.82倍和1.37倍。
Wedge-shaped pile is a longitudinal profiled cross-section pile which can effectively exert pile-side frictional resistance and improve unit material utilization rate. However, the research on pile-sinking construction process is relatively few. Based on the PFC numerical analysis software, a numerical model of wedge pile sinking pile construction process simulation was established. For the comparative analysis, a numerical model of conventional equal-sectional pile pile sinking pile construction process with equivalent volume of concrete was established. Pile model test and the calculation results of the hole expansion theory are contrasted and analyzed to verify the accuracy and reliability of the numerical model established in this paper. The displacement field, stress field and pile sinking Resistance and other changes. The results show that the wedge pile static pressure pile effect is basically similar to that of the equivalent cross-section pile. Under the condition of the numerical model, the tip resistance, the pile side friction resistance and the overall pile resistance of the wedge pile static pressure pile construction are The same section of the pile 1.0 times, 1.82 times and 1.37 times.