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采用自主设计的长期循环加载装置,进行了不同密实度砂土中单桩竖向循环加载模型试验,考虑砂土密实度的影响,建立了循环累积位移预测模型,并对其适用范围进行了探讨。试验结果回归分析表明,第1次循环累积位移与循环荷载比呈指数函数模型变化,模型参数与砂土密实度有关。在一定循环累积位移速率范围内,桩顶循环累积位移与循环次数幂函数模型的预测值与实测值吻合较好,但循环累积位移速率受砂土密实度的影响,因此,应对桩顶循环累积位移的发展规律进行分区,以考虑砂土密实度的影响。
The self-designed long-term cyclic loading device was used to carry out the vertical cyclic loading model test of single pile in different compacted sandy soil. Considering the influence of sand and soil compaction, a cyclic cumulative displacement prediction model was established and its applicable scope was discussed . The regression analysis of the test results shows that the first cycle cumulative displacement and cyclic load ratio changes exponentially, and the model parameters are related to the sand compactness. Within a certain cyclic cumulative displacement rate, the predicted value of the cyclic cumulative displacement and the power function model of the cycle number agree well with the measured values, but the cyclic cumulative displacement rate is affected by the density of the sand so that the pile top cycle should be accumulated Displacement of the law of development for zoning to consider the impact of sand density.