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三峡水库修建蓄水后,大量的古滑坡复活,并形成了一些新滑坡。大量的调查研究和工程实例表明滑坡前缘库水升降是致使水库滑坡形成和变形的重要诱发因素。以三峡库区大石板滑坡为例,使用FLAC3D软件建立不同蓄水阶段时滑坡的变形和稳定性状况,得到大石板滑坡变形发展趋势与库水升降之间的相关规律。研究表明,大石板滑坡稳定性良好,但蓄水状态下变形及稳定性状况较天然状态明显恶化,尤其是库水下降后滑坡的变形最大,稳定性也最差。
After the Three Gorges Reservoir was built, a large number of ancient landslides were revived and some new landslides were formed. A large number of investigations and engineering examples show that the landslide front water level rise and fall is an important trigger factor for reservoir landslide formation and deformation. Taking Dashiban landslide in the Three Gorges Reservoir area as an example, the deformation and stability of landslide at different stages of water storage are established by using FLAC3D software. The correlation between the development trend of landslide deformation and the rise and fall of reservoir water is obtained. The study shows that the stability of the large slab landslide is good, but the deformation and the stability of the slab landslide obviously deteriorate compared with the natural state when the water is in the reservoir, especially the deformation and the stability of the landslide are the worst when the reservoir water decreases.