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Abstract Taking a soil-rock mixture slope in the middle reaches of Jinsha River for example， the fluid-solid coupling and stability characteristics during rising and drawdown of reservoir water levels are studied based on its fine geological structure model. The results indicate that during the initial impoundment period，the deformation of the ground surface is very slow，while the reservoir water level reaches certain elevation it exhibits a trend of sharp rise；the safety factor of the slope stability will decrease；and when the water level reaches a critical one it has the minimum value；hereafter it will rise with the water level rising；the sudden drawdown of the reservoir water level does affect the stability of the slope greatly；and the decreasing value of the safety factor will increase with the amplitude of the drawdown of the water level. All these results will be very useful not only for the practical engineering but also for the theoretical study of the soil-rock mixture slopes in reservoir area.
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Received: 03 December 2008
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