| 基于非饱和土固结理论的有限元强度折减法 |
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| 引用本文： | 周桂云,李同春.基于非饱和土固结理论的有限元强度折减法[J].岩土力学,2008,29(4):1133-1137. |
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| 作者姓名： | 周桂云 李同春 |
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| 作者单位： | 1. 河海大学 水文水资源与水利水电工程科学国家重点实验室，南京 210098；2. 河海大学 水利水电工程学院，南京 210098 |
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| 摘 要： | 库水位下降使库岸坡体内产生饱和－非饱和非稳定渗流，非稳定渗流作用是边坡失稳的重要原因之一。为了分析非稳定渗流对边坡稳定性的影响，首先推导了固、液两相孔隙介质的固结方程，考虑了土体渗流与变形的耦合作用。在此基础上结合有限元强度折减法求解边坡稳定安全系数，将渗流、变形及稳定分析采用一套统一的有限元方法。并通过算例分析了库水位骤降情况下，坡体的渗透系数、水位降落比对稳定安全系数的影响，计算结果表明，所提的理论和方法是有效可行的，为饱和-非饱和非稳定渗流作用下边坡稳定问题的分析提供了实用工具。
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| 关 键 词： | 饱和-非饱和 非稳定渗流 非饱和土 固结理论 边坡稳定 有限元强度折减法 |
| 文章编号： | 1000-7598-(2008)04-1133-05 |
| 收稿时间： | 2007-05-30 |
| 修稿时间： | 2007年5月30日 |
FEM strength reduction method based on consolidation theories of unsaturated soils |
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| ZHOU Gui-yun,LI Tong-chun.FEM strength reduction method based on consolidation theories of unsaturated soils[J].Rock and Soil Mechanics,2008,29(4):1133-1137. |
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| Authors: | ZHOU Gui-yun LI Tong-chun |
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| Institution: | 1.State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; 2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | The water level falling of the reservoir produces saturated-unsaturated unsteady seepage in the slope. The unsteady seepage is one of the important reasons of slope instability. To know the influences of unsteady seepage on the slope stability, consolidation equation of solid and liquid phase porous media is derived, which takes the coupling role of seepage and deformation into consideration. On this basis, slope stability factor is calculated by finite element shear strength reduction method; and a set of unified finite element method is adopted for seepage, deformation and stability analysis. The influences of permeability of soil and falling of water level of the slope on stability factor of landslide in case of sharp falling of reservoir level are analyzed through case dies. The calculation results indicate that the theory and method proposed are feasible and effective. An efficient tool to analyze the slope stability problem under saturated-unsaturated unsteady seepage is given. |
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| Keywords: | saturated-unsaturated unsteady seepage unsaturated soils consolidation theory slope stability FEM strength reduction |
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