水库滑坡涌浪是水库运行中面临的重要的灾害类型,对涌浪灾害的预测需先进行滑坡体的下滑速度分析。以某水库高位散体滑坡体为例,分别利用传统经验公式法和离散单元法(DEM)对滑坡体下滑速度进行了分析计算。结果表明,传统方法计算散体滑坡下滑速度具有局限性,DEM法计算得到不同时刻滑坡体变形破坏过程及DEM球形颗粒速度,在重力作用下失稳物质在滑坡启动时速度不大,在基岩坡面运动过程中速度不断增大,最终入水速度最大约40 m/s左右。DEM法分析滑坡变形破坏过程与滑坡体失稳运动过程定性分析基本一致,对于高位散体滑坡灾害过程分析具有优势,可以为同类工程问题提供良好的借鉴。

Landslide surge is a grave disaster in the operation of reservoir. The prediction of landslide surge requires an analysis of the sliding speed of the landslide. With a high-level loose landslide body in a reservoir as an example, the sliding speed of the landslide body was calculated using traditional empirical formula and discrete element method (DEM) respectively. Traditional method has some limitations in calculating the sliding speed of loose landslides, while DEM is superior in analyzing the process of landslide surge of high-level loose landslide as the DEM-simulated deformation process is basically consistent with qualitative instability process. According to DEM-calculated deformation and failure process of landslide at different instances and the velocity of DEM spherical particles,the speed of unstable materials was not large in the incipience of sliding under the action of gravity, but increased continuously during the movement on bedrock slope, and finally reached about 40 m/s upon entering water. The present method has advantages in analyzing the disaster process of high-level loose landslides and provides a good reference for similar engineering problems.