中文摘要：

水库水位的涨落对库岸滑坡稳定性有着显著影响。三峡水库水位涨落引起滑坡体内地下水位的变化,是非饱和到饱和过程。本文就非饱和渗流理论,在库水位涨落过程中,模拟了三峡库区马家沟滑坡暂态渗流场的变化,分析了库水位变动时孔隙水压力的变化。结合有限元强度折减法,将得到的暂态孔隙水压力以荷载方式叠加到有限元中,对该滑坡稳定性进行评价,并探讨了在一个水文周期内水位涨落时滑坡稳定性的变化。结果表明：不论库水位上升或下降,滑坡体的稳定性都显示先减小后增大的趋势。最后对马家沟滑坡提出了在库水位常规下降速度下抗滑桩与地表排水相结合的治理设计方案。

英文摘要：

The fluctuation of reservoir water level had a great effect on stability of the landslides by the reservoir.There was a process from unsaturated to saturated in the groundwater seepage field in Majiagou landslide,caused by the fluctuation of water level of Three Gorges Reservoir.Based on the unsaturated seepage theory,the transient change of seepage field in the process was simulated using a finite element method（FEM）,and the pore water pressure was also analyzed,during the cycle of reservoir water level change.The transient pore water pressure was added to the elements as a load by the strength reduction method.Then the landslide stability was analyzed as the water level changes in a hydrological period.The calculation results showed that the stability of the landslide firstly decreases and then increases gradually,regardless the water level rises or falls.ln the end,a construction plan combining anti -slide piles and surface drainage was proposed,based on the stability of landslide at a normal falling rate of the reservoir water level.