辽沈地区深基坑开挖条件下抗拔桩承载力分析

On loading capacity of uplift pile in open excavation condition of deep foundation pits in Liaoning and Shenyang

以辽沈地区的某工程为例,在现场试验的基础上,结合数值模拟计算软件对等截面抗拔桩的承载特性进行了分析,结果表明开挖将导致坑内土体产生卸荷回弹,从而带动抗拔桩回弹,桩身上下部分分别承受正、负摩阻力,并在桩身产生轴向拉力,同时,桩土界面法向应力降低,导致桩的极限抗拔承载力降低。

Taking some project in Liaoning and Shenyang as the example, the paper combines the numeric simulation calculation software to analyze the loading capacity features of uniform section uplift piles, proves by the result that the excavation will lead to the unloading rebound in pit soil which will lead to up-lift pile rebound, indicates the upper and lower parts of the pile can bear the positive and negative frictional resistance while the axial tensile force can be formed in the piles, and indicates the decreasing force of pile-earth interface method which will cause the decrease of the pile＇ s extreme uplift pile＇ s loading capacity.