库水上升对含软弱夹层滑坡稳定性影响模型的试验研究

为研究库水作用对含软弱夹层滑坡稳定性影响,采用含软弱夹层的滑坡模型进行库水升降作用试验,测量了库水升降过程中滑坡体内土压力、孔隙水压力的变化情况,以及滑坡体内若干部位的位移情况。结果表明:库水位上升时,库水浸泡滑坡阻滑段导致阻滑力降低,滑坡稳定性随之降低,引起滑坡产生位移变形;库水上升过程对滑坡稳定的影响分为稳定、缓慢变形及整体滑移阶段3个阶段,3个阶段表现出不同的力学及变形特征,也反映了滑坡体稳定性随库水上升而下降的过程;滑坡体中软弱夹层为滑坡体内的薄弱部位,是决定滑坡稳定性的关键部位。

Model Test Study on Landslide with Weak Layers under Uprise of Reservoir Water

In order to study the impact of reservoir water level fluctuation on stability of landslide with weak layers, we carry out model test and measure the variations of soil pressure and pore water pressure as well as displacements of certain parts of the landslide body during reservoir water level fluctuation. Results show that as reservoir water level rises, slip resistance decreases due to immersion of reservoir water, stability of the landslide reduces, and dis?placement occurs in landslide. Impacts of reservoir water rising on landslide stability can be divided into three sta?ges:stability phase, slow deformation phase and global glide phase. The three stages exhibits different characteris?tics, reflecting that the landslide stability decreases with reservoir water rising. Meanwhile, weak interlayer in the landslide is not only the weak part of the landslide, but also the crucial part for landslide stability.