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低幅值、大周次竖向循环荷载作用下桩基发生累积沉降及承载力弱化,影响到风机塔架、高速铁路路基等沉降敏感结构物的服役性能。首先总结了竖向循环荷载作用下桩基设计要求及若干设计关键问题。基于模型试验结果,分析了竖向循环荷载作用下的桩基承载力和累积沉降演化规律;定义了3种桩顶累积沉降发展模式及对应的循环荷载比和静荷载比组合,建立了桩基循环累积沉降分析图,提出了组合循环荷载作用下的桩基循环加载性状简化判定公式。提出了针对竖向循环荷载作用下桩基的设计方法及设计流程,并给出了设计实例。
The cumulative settlement and the weakening of bearing capacity of pile foundations under the condition of low amplitude and large weekly vertical cyclic loading affect the service performance of sensitive structures such as wind turbine tower and high speed railway subgrade. Firstly, the design requirements of pile foundation under vertical cyclic loading and some key design problems are summarized. Based on the results of the model test, the pile foundation bearing capacity and cumulative settlement evolution under vertical cyclic loading are analyzed. Three kinds of pile top cumulative settlement development patterns and corresponding combinations of cyclic loading ratio and static load ratio are defined, and pile foundation Cyclic cumulative settlement analysis plots, put forward a combination of cyclic loading under the cyclic loading behavior of pile foundation to determine the simplified formula. The design method and design flow of pile foundation under vertical cyclic loading are put forward and the design examples are given.