| 考虑砂土密实度影响的单桩竖向循环加载模型试验 |
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| 引用本文： | 张 勋,黄茂松,刘 莹.考虑砂土密实度影响的单桩竖向循环加载模型试验[J].岩土力学,2016,37(7):1914-1920. |
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| 作者姓名： | 张 勋 黄茂松 刘 莹 |
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| 作者单位： | 1. 同济大学 岩土及地下工程教育部重点实验室，上海 200092；2. 同济大学 地下建筑与工程系，上海 200092 |
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| 基金项目： | 国家重点基础研究发展计划项目（973计划）(No. 2013CB036304)；教育部高等学校博士点基金项目(No. 20110072110008)。 |
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| 摘 要： | 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。
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| 关 键 词： | 单桩 竖向循环加载 循环累积位移 模型试验 砂土密实度 |
| 收稿时间： | 2014-11-28 |
Model tests on a single pile considering influence of sand density under cyclic axial loading |
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| ZHANG Xun,HUANG Mao-song,LIU Ying.Model tests on a single pile considering influence of sand density under cyclic axial loading[J].Rock and Soil Mechanics,2016,37(7):1914-1920. |
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| Authors: | ZHANG Xun HUANG Mao-song LIU Ying |
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| Institution: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | Model tests on a single pile in sands with different densities are carried out by using a self-developed cyclic loading apparatus for a long term. A prediction model for cyclic cumulative displacement is established considering the influence of sand density, and its application scope is discussed. The regression analysis of model tests results reveals that the first cyclic cumulative displacement increases exponentially with cyclic load ratio, and the model parameters are related to the relative density of sand. The predicted values of cyclic cumulative displacement obtained by the power function model are consistent with the measured values within a certain level of cyclic cumulative displacement rate, but the cyclic cumulative displacement rate is associated with the sand density, therefore, the influence of the sand density on partition rule of cyclic cumulative displacement under cyclic axial loading should be considered. |
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| Keywords: | single pile cyclic axial loading cyclic cumulative displacement model test sand density |
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