非饱和非稳定渗流作用下边坡稳定的有限元塑性极限分析下限法

周建烽; 王均星; 陈炜

doi:10.11779/CJGE201412019

非饱和非稳定渗流作用下边坡稳定的有限元塑性极限分析下限法 English Version

1. 武汉大学水资源与水电工程科学国家重点实验室,湖北武汉 430072; 2. 福建省水利规划院,福建福州 350001

详细信息

作者简介:
周建烽(1989- ),男,福建南平人,博士研究生,从事高坝结构工程研究。E-mail: zhoujf@whu.edu.cn。

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出版历程
- 收稿日期: 2013-09-02
- 发布日期: 2014-12-25

Lower bound analysis of slope stability subjected to transient unsaturated seepage

1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Fujian Provincial Planning Institute of Water Resources, Fuzhou 350001, China

摘要

摘要: 常规的土坡稳定性分析方法主要是基于饱和土理论和稳定渗流情况,难以反映降雨作用和水位骤降对边坡稳定的影响,而实际上相当一部分坡体失稳是由于非饱和非稳定渗流引起的。基于Bishop提出的非饱和土有效应力原理以及Fredlund双应力强度理论,将任意时刻的水压力当做体积力考虑到平衡方程中,用基于有效应力的方式建立满足平衡条件、间断条件、应力边界条件以及屈服条件下考虑非饱和非稳定渗流作用的下限法非线性规划模型,并且编制了相应的程序。通过对降雨入渗和库水骤降的边坡数值算例的分析,验证了所提方法的正确性,对非饱和非稳定渗流作用下土坡失稳的规律有了进一步的认识。
- 边坡稳定 /
- 有限元 /
- 极限分析 /
- 库水骤降 /
- 降雨入渗
Abstract: The conventional methods for slope stability analysis are mainly based on the theory of saturated soils and the stable seepage situation and difficult to reflect the influence of rainfall and water level drawdown on slope stability. Actually quite a number of slope instabilities are caused by transient unsaturated seepage. Based on the effective principle of unsaturated soils by Bishop and the theory of two-stress-state-variable mechanism of the shear strength by Fredlund, the water pressure at any time is introduced into the balance equation as the volume force and the effective stress fields satisfying the conditions of equilibrium, stress boundary, yielding and stress discontinuity are constructed. By using the idea of nonlinear programming, a lower bound analysis model for the slope stability subjected to transient unsaturated seepage is established, and the corresponding program is compiled. Through numerical examples of impoundment drawdown and rainfall infiltration analysis, the correctness of the proposed method is verified, and a further understanding about the law of slope instability subjected to transient unsaturated seepage is obtained.
- slope stability /
- finite element /
- plastic limit analysis /
- impoundment drawdown /
- rainfall infiltration

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参考文献(14)

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