三峡库水升降条件下大石板滑坡变形及稳定性预测

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。

The forecast of deformation and stability to dashiban landslide under the TGP reservoir water level fluctuating

A large number of ancient landslides revived after the Three Gorges Reservoir was constructed and impounded,and some new landslides emerged.It has turned out that the fluctuation of reservoir water level is the significant contributing factor of reservoir landslides’ formation and deformation according to massive investigation and engineering cases.Take Dashiban landslide for an example,the paper uses FLAC3D to establish underground water models at different impounded stages and evaluates and predicts its stress and strain,including vertical stress,maximum main stress,minimum main stress,displacement,shear strain increment,and stability.As a result,some hidden relations between the landslide’s deformation development trend and reservoir water fluctuation have been summarized.The research shows the stability of Dashiban landslide is all right at present,but compared to natural,deformation and stability of impounded landslide deteriorated obviously,especially when reservoir water level fallen down.