DX旋挖挤扩灌注桩不同承力盘数性能对比研究

Study on property comparison of DX pile casted-in-place with various quantities of bearing bells

通过数值模拟计算,对DX单桩的沉降和承载力特性进行了研究,分析了在相同的桩长、桩径等条件下直孔桩、两个承力盘DX桩和三个承力盘DX桩的性能差异。沉降方面,在桩顶荷载增加相同的情况下,两个承力盘DX桩对桩顶沉降的控制明显强于普通直孔桩的控制效果,三个承力盘DX桩则进一步优越于两个承力盘DX桩。承载力方面,两个承力盘DX单桩的抗压承载力大约为直孔桩的1.5倍,而三个承力盘DX桩又进一步优越,大约为两个承力盘DX桩的1.2倍。

Based on numerical simulation, beating capacity and settlement control for DX piles are studied. The property differences of conventional straight piles,DX piles with 2 bells and DX piles with 3 bells are presented in condition of identical length, diameter, and bearing capacity. Under the same load, DX piles with 3 bells have smaller settlement than that of DX piles with 2 bells and straight piles. As to beating capacity, DX piles with 2 bells are 1.5 times greater than that of the straight piles, while DX piles with 3 bells are 1.2 times greater than that of DX piles with 2 bells. The paper can provide theoretical references for the design of beating capacity of DX piles during the engineering practice.