| 考虑非Darcy渗流时循环荷载下饱和黏土一维固结分析 |
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| 引用本文： | 孙丽云,刘忠玉,乐金朝,张杰.考虑非Darcy渗流时循环荷载下饱和黏土一维固结分析[J].岩土力学,2010,31(Z1):62-68. |
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| 作者姓名： | 孙丽云 刘忠玉 乐金朝 张杰 |
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| 作者单位： | 1. 郑州大学,水利与环境学院,郑州,450001
2. 郑州大学,土木工程学院,郑州,450001 |
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| 基金项目： | 河南高速公路发展有限责任公司科技项目，河南省教育厅自然科学研究计划项目 |
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| 摘 要： | 考虑到土体处于超固结状态下的压缩性一般要比正常固结状态下的低,引入描述非Darcy渗流的Hansbo方程,修正了Terzaghi饱和黏土一维固结方程,并将其推广到低频循环荷载作用的情况。采用有限体积法对该方程进行了求解,并讨论了非Darcy渗流参数、循环荷载周期以及超固结状态下土体压缩性对固结进程的影响。计算结果表明,在矩形波载作用下,按孔压定义和按变形定义的固结度都随时间增长而震荡增加,且按孔压定义的固结度的震荡幅度明显大于按变形定义的固结度。另外,非Darcy渗流减缓了地基的沉降速率,且循环荷载周期越短,或超固结状态下压缩性越高,地基的沉降速率就越慢。
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| 关 键 词： | 固结理论 非Darcy渗流 固结状态 循环荷载 有限体积法 |
| 收稿时间： | 2010-04-23 |
One-dimensional consolidation of saturated clays under cyclic loading considering non-Darcy flow |
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| SUN Li-yun,LIU Zhong-yu,YUE Jin-chao,ZHANG Jie.One-dimensional consolidation of saturated clays under cyclic loading considering non-Darcy flow[J].Rock and Soil Mechanics,2010,31(Z1):62-68. |
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| Authors: | SUN Li-yun LIU Zhong-yu YUE Jin-chao ZHANG Jie |
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| Institution: | 1. School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450001, China; 2. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China |
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| Abstract: | The Hansbo’s formula for the non-Darcy flow was introduced to modify Terzaghi’s one-dimensional consolidation equation considering that the compressibility of soil in the over-consolidated state is usually less than that in the normally consolidated state. The cases under the cyclic loading with low-frequency were taken into account by using the presented equation; and the numerical solution was performed using the finite volume method. Then the effects of the parameters of non-Darcy flow, the period of loading and the compressibility of soil in the over-consolidated state on the consolidation process were investigated. The results indicate that, under the cyclic square loading, both degrees of consolidation in terms of settlement and pore water pressure are shown as vibratory increase with time; and the amplitude of degree of consolidation in terms of pore water pressure is greater than that in terms of settlement. In addition, it is found that the settling velocity of foundation is delayed by the non-Darcy flow, and decreased as the period of loading shortened or the compressibility of soil increased in the over-consolidated state. |
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| Keywords: | consolidation theory non-Darcy flow state of consolidation cyclic loading finite volume method |
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