Strength reduction FEM in stability analysis of soil slopes subjected to transient unsaturated seepage
Strength reduction FEM in stability analysis of soil slopes subjected to transient unsaturated seepage
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DOI：
10.1016/j.compgeo.2008.03.006
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发表时间：
2009
影响因子：
5.3
通讯作者：
Maosong Huang;C. Jia
中科院分区：
文献类型：
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作者：
Maosong Huang;C. Jia
水位波动或降雨引起的土质边坡失稳是近年来研究的热点，其失稳机理与非饱和土基质吸力的变化密切相关。这种变化基本上是由非饱和瞬态渗流引起的。非饱和渗流作用下边坡稳定性分析的传统方法是极限平衡法。极限平衡法受分析方法和破坏机理假设的限制。为了克服这些局限性，结合抗剪强度折减技术的有限元法（SSRFEM）已成功应用于无渗流情况下的边坡稳定性分析。本文的主要目的是将强度折减有限元法的应用扩展到非饱和瞬态渗流的影响，并给出了土坝在水位骤降下稳定性的一些初步数值结果。重点是比较LEM和SSRFEM得到的安全系数。最后提出了今后研究的方向。
The instability of soil slopes induced by the fluctuation of water level or rainfall has received much attention in the literature recently and the failure mechanism is closely related to the change of matric suction of unsaturated soils. Such a change is basically induced by unsaturated transient seepage. The traditional approach for estimating the stability of slopes subjected to unsaturated transient seepage is based on the limit equilibrium method (LEM). The limit equilibrium approach is limited by assumptions about analysis method and failure mechanism. In order to overcome those limitations, a finite element method with shear strength reduction technique (SSRFEM) has been successfully applied to the slope stability analysis in absence of seepage. The main objective of this paper is to extend the use of the strength reduction FEM to include the effects of unsaturated transient seepage and some primary numerical results concerning the stability of an earth dam under rapid drawdown are presented. Emphasis has been given to comparison of the safety factors obtained by LEM and SSRFEM. Topics for the further research in this area are also suggested.