| 循环荷载作用下超固结软黏土的累积变形研究 |
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| 引用本文： | 王浩然,项培林,王其伟.循环荷载作用下超固结软黏土的累积变形研究[J].路基工程,2017,0(5):90-93. |
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| 作者姓名： | 王浩然 项培林 王其伟 |
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| 作者单位： | 1.上海市城市建设设计研究总院(集团)有限公司, 上海 200125 |
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| 摘 要： | 交通荷载作用下，公路和机场跑道产生较大沉降，会降低工程设施服务性能，增加危险性与维护费用。为避免土体在循环荷载作用下产生较大工后沉降，一般对软土地基进行预压处理，使其成为超固结土，可以大大降低其累积变形。针对上海第3层原状土，采用不同超固结处理后进行不排水循环三轴试验，以研究正常固结土与超固结土在不同循环应力比作用下累积应变，并给出了相关的预测模型。结果表明，超固结作用可以大大降低土体在循环荷载作用下的累积应变。
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| 关 键 词： | 循环荷载 超固结 累积应变 显式模型 |
| 收稿时间： | 2019-11-10 |
Study on Accumulative Deformation of Overconsolidated Soft Clay Subjected to Cyclic Loading |
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| Abstract: | Highways and airport runways are easy to produce large settlement under traffic loading, which will decrease the service performance of engineering facilities and increase the danger to use them and the expense to repair them. To avoid the excessive post-construction settlement, engineers usually preload the foundation to change the soil into overconsolidated state, which can help to decrease its accumulative deformation greatly. A series of undrained cyclic triaxial tests were performed after the soil was overconsolidated with different OCRs to study the accumulative strain of normally consolidated and overconsolidated clay subjected to different cyclic stress ratios based on the 3 layer undisturbed soil in Shanghai and relative forecast model is given. The experimental results show that overconsolidation can help to decrease soil’s accumulative strain under cyclic loading greatly. |
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