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以数值分析为手段,对挤扩支盘桩的承载力、沉降以及桩身轴力分布、桩侧摩阻力发挥等竖向承载特性进行系统分析,研究表明:相对直杆桩,挤扩支盘桩具有高承载力、低沉降的特性,桩身轴力在支盘上下界面处明显降低。支盘位置和荷载水平桩身侧摩阻力、支盘承载力发挥具有明显影响。此外,探讨了支盘间距、支盘数量、支盘直径对挤扩支盘桩的不同影响,在工程实践应用中,应全面考虑施工难度、施工速度等因素,寻求最佳支盘间距、最优支盘数量和最优支盘直径,获得最佳支盘间距约为2.5~3倍支盘直径。
By means of numerical analysis, the vertical bearing characteristics of the squeezed branch pile, such as bearing capacity, settlement, pile axial force distribution and pile friction resistance, are systematically analyzed. The results show that: compared with straight pile, The pile has the characteristics of high bearing capacity and low settlement, and the axial force of the pile is obviously reduced at the upper and lower interfaces of the support plate. Support plate position and load level pile body side frictional resistance, branch bearing capacity has a significant impact. In addition, the different influences of the distance between support plates, the number of support plates and the diameter of support plates are discussed. In engineering practice and application, full consideration should be given to factors such as construction difficulty and construction speed to find the best support plate spacing The number of excellent pallets and the diameter of the best pallets, to obtain the best distance between pallets is about 2.5 to 3 times the diameter of the pallets.