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为了研究抗拔桩在循环加载过程中桩身的性状,选取杭州萧山某工地两根抗拔桩作为试桩进行循环加载试验。在抗拔桩桩身埋设钢筋应力计,测量循环加载过程中桩身应力的变化情况;在桩身预埋钢管,测量桩顶及桩端上拔量。通过对桩身应力及桩顶、桩端上拔量的分析,研究循环加载对抗拔桩承载力及上拔量的影响。综合分析抗拔桩承受循环荷载时的桩顶、桩端上拔量、桩身轴力以及桩侧摩阻力分布可知,当抗拔桩承受循环荷载时,且临界循环荷载水平较大(接近或者达到1),抗拔桩经过2～3次循环加载后就发生破坏,其研究结果可供其他类似工程参考。
In order to study the pile body’s behavior during cyclic loading, two pull-up piles at a construction site of Hangzhou Xiaoshan were selected as test piles for cyclic loading test. Reinforced bar stress gauge is embedded in the pile body of the uplift, and the change of pile stress in the process of cyclic loading is measured; the steel pipe is embedded in the pile body, and the pulling amount is measured on the pile top and the pile head. Through the analysis of the pile body stress and the pull-out of pile top and pile head, the influence of cyclic loading on the bearing capacity and pull-up of pile is studied. According to the analysis of pile top, pile pull-out, pile axial force and pile-side frictional resistance distribution under cyclic loading, it can be seen that when the tension pile is subjected to cyclic loading and the critical cyclic load is large (close to or Up to 1), the pile will break after 2 ~ 3 cycles of loading, and the results of this study can be used as reference for other similar projects.