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刚性桩在高铁低矮路堤加固中广泛应用。利用浙江大学大型地基与边坡工程模型试验系统,开展了饱和粉土地基中刚性单桩动力加载大比例模型试验,对不同静偏荷载及循环荷载组合作用下的桩基性状进行了研究。通过模型桩身安装的各类传感器,对桩顶累积沉降、桩身轴力、桩–土界面孔压及正应力变化进行了监测。试验发现,循环剪切会引起桩–土界面土颗粒重排,导致桩–土界面孔压及有效应力状态发生改变。循环荷载比CLR对桩基累积沉降、桩侧应力状态发展影响显著。根据试验结果,对累积沉降发展规律进行了归纳,分析并讨论了桩侧应力状态变化机理。
Rigid piles are widely used in high embankment reinforcement of high-speed railway. In this paper, a large-scale model test of rigid single-pile dynamic loading in saturated silt ground is carried out by using the large-scale foundation and slope engineering model test system of Zhejiang University. The pile foundation traits under different combinations of static load and cyclic load are studied. Various types of sensors installed on the model pile body are used to monitor the cumulative settlement of the pile top, the axial force of the pile body, the pore pressure at the pile-soil interface and the normal stress. It is found that cyclic shear can cause particle rearrangement of pile-soil interface, resulting in the change of pore pressure and effective stress at pile-soil interface. The cyclic loading has a significant effect on the cumulative settlement of pile foundation and the development of pile-side stress state than the CLR. According to the test results, the development of cumulative settlement is summarized, and the mechanism of stress state changes on pile side is analyzed and discussed.