水库库岸滑坡的运动过程分析及初始涌浪计算

从地面运动和水下运动2个阶段对水库库岸滑坡的受力特征进行了分析, 用牛顿定律和运动学基本原理求解滑坡地面运动的加速度和速度, 且把地面运动的末状态作为水下运动的初始状态, 用流场阻力公式和粘滞力公式求解滑坡水下运动的时间与速度, 并运用动量定理对其初始涌浪高度进行了计算.以三峡库区新滩滑坡为例, 采用条分方法, 计算出各条块入水速度、水下运动的时间及其激起的涌浪高度值, 得出了地面运动过程中滑坡速度值先增后减及水下运动过程中滑坡速度与时间呈反正切型关系的规律, 并认为涌浪高度变化与条块的高度变化具有较强的关联性. 

Analysis of Movement Process of Landslide in Reservoir and Calculation of Its Initial Surge Height

The movement of landslide in reservoir is divided into two stages, which are movement on ground and movement below water level, and the forcing characteristics of both stages are analyzed in this paper. The Newton law and the basic principles of kinematics are used to solve velocity and acceleration of landslide when it moves on ground surface, and the terminal conditions of stage on ground are considered as the initial conditions of stage below water level. The resistance formula in flow field and viscous force formula are applied to solve velocity and time of landslide when it moves below water level. At last, the momentum theory is adopted to calculate surge height. This paper takes Xintan landslide in the Three Gorges reservoir as the example and takes use of vertical slice method to calculate speed on ground surface, time below water level and surge height of each slice. It comes to the conclusions that the landslide firstly accelerates, then decelerates on surface, and the relationship between time and speed below water level is arc tangent and shows that the surge height keeps a great correlation with the height of slice.