三峡库区蓄水以来,在库水位的周期升降以及降雨条件的影响下,库岸滑坡的岩土体物理性质发生改变,大量涉水滑坡发生复活变形.为了分析三峡库区的水位周期性升降对涉水滑坡稳定性的影响,以库区较为发育的动水压力型滑坡为研究对象,分析库区水位升降对滑坡稳定性和滑坡地下水位线的影响.选取三峡库区秭归县白家包滑坡为例,以Geo-Studio软件的SEEP/W以及SLOPE/W模块为辅助工具,分别分析不同滑坡体渗透系数、不同库水位升降速率下的滑坡稳定性,以及地下水位线的变化规律.结果表明:对于库区动水压力型滑坡,当库水位上升时,滑坡体的稳定性整体而言是增加的,滑坡体地下水位线呈现向下弯曲的趋势;库水位下降时,滑坡体的稳定性整体是降低的,滑坡体地下水位线呈现向上弯曲的趋势.在不同的滑坡体渗透系数下,滑坡体的渗透系数越小,库水位升降时对滑坡稳定性影响也越大.%Since the impoundment of the Three Gorges Reservoir, the physical properties of rock and soil mass of the bank landslide have been changed and the large amount of wading landslide has been resurrected under the influence of the fluctuation of the water level and the rainfall conditions.In order to analyze the influence of water level fluctuation in the Three Gorges reservoir area on the stability of wading landslide, the hydrodynamic pressure landslide developed in the reservoir area is studied to analyze the influence of reservoir water level on landslide stability and groundwater level.Taking Baijiabao landslide in Zigui County of Three Gorges Reservoir Area as an example, the SEEP/W and SLOPE/W modules of Geo-Studio software are used as auxiliary tools to analyze the landslide stability under different landslide permeability and different reservoir water level and the variation of groundwater level.The results show that for the hydrodynamic pressure landslide in the reservoir area, the stability of the landslide body is increased when the reservoir water level rises, and the groundwater level line of the landslide body tends to bend downward;the stability of the landslide body is reduced as the reservoir water level declines, and the groundwater level line of the landslide body tends to bend upward.The smaller the seepage coefficient of the landslide, the greater the impact of the reservoir water level fluctuation on the stability of the landslide.
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