关键词: 库岸滑坡, 库水位, 边坡稳定性, 地下水, 三门洞滑坡, 三峡库区

Abstract: Since the establishment of professional monitoring for Sanmendong landslide in Three Gorges Reservoir area, it was found that the landslide had experienced continuous creep deformation. Through field investigation and GPS monitoring data analysis, the seepage field of landslide was simulated by Geo-studio finite element software and the stability of landslide under different fluctuation rates of reservoir water was analyzed. The results showed that:① When the reservoir water level rose, the distribution of landslide stability was convex, it rose initially then fell and it reached the highest stability at the rising rate of 1.6 m/d.② When the water level of the reservoir dropped, the distribution of landslide stability was concave, it dropped initially then rose. The peak values of stability were varied under different fluctuation rates, but it finally reached a same value.③ As a typical accumulation body landslide, the rise and fall of reservoir water level were the main factors that lead to deformation of the landslide. At present, Sanmendong landslide has been in the state of creep deformation, but it will not slip as a whole.

Key words: reservoir bank landslide, reservoir water level, slope stability, underground water, Sanmendong landslide, Three Gorges Reservoir area;