Hou X-P, Xu Q, He J, Chen S-H (2015) Composite element algorithm for unsteady seepage in fractured rock masses. Hammouri NA, Malkawi AIH, Yamin MMA (2008) Stability analysis of slopes using the finite element method and limiting equilibrium approach. China Water Power Press, Beijing Ĭhen S-H (2015) Hydraulic structures. Ĭhen Z-Y (2003) Soil slope stability analysis: theory, methods and programs. Ĭhen Z-Y (1992) Random trials used in determining global minimum factors of safety of slopes. īishop AW (1955) The use of the slip circle in the stability analysis of slopes. Wiley, New Yorkīerilgen MM (2007) Investigation of stability of slopes under drawdown conditions. Before the reservoir operation, the appropriate drawdown speed is selected according to the charts to ensure a slow drawdown for adjacent slope, while in the slope stabilization design, only the rapid drawdown stability analysis needs to be performed.Ībramson LW, Lee TS, Sharma S, Boyce GM (2002) Slope stability and stabilization methods. ![]() This paper presents a series of charts for engineers and designers to judge rapid and slow drawdown conditions. The drawdown condition that causes a large percent reduction in safety factor is judged as a rapid drawdown, and the opposite is a slow drawdown, which does not affect the slope design. By considering a wide range of K/( S y v) and c′/( γHtan ϕ′) values and different slope geometries, the percent reduction in critical safety factor of slope during drawdown relative to that during steady-state seepage is obtained. Computations show that for slopes with a specific geometry, the safety factor ratio depends on the parameters K/( S y v) (where K is the permeability coefficient, v is the drawdown speed, and S y is the specific yield) and c′/( γHtan ϕ′) (where c′ and ϕ′ are the effective cohesion and friction angle, γ is the soil unit weight, and H is the slope height). ![]() The finite element method is used to analyze the transient seepage during drawdown, and then the pore water pressures are introduced into the stability computation based on limit equilibrium to obtain the transient safety factor. In order to avoid potential risks, it is important to calculate the change of slope safety factor prior to the reservoir operation. The rapid drawdown of reservoir may have a significant impact on the stability of adjacent slopes.
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