关键词: 滑坡速度, 美国土木工程师协会推荐公式, 运动方程方法, 水阻力, 初始涌浪高度

Abstract: The calculation of sliding velocity of landslide is the basis of surge prediction. On basis of considering the resistance of water, the formulas advised by The American Society of Civil Engineers and movement equation method are improved. Taking the Xiatudiling landslide in the Three Gorges Reservoir of Zigui county for example, the average velocity and each slice’s acceleration, velocity in the process of sliding are calculated; the comparative analysis about the value and change law of acceleration, velocity is made between pre and post considering the water resistance; and then, the height of initial surge evoked by the landslide is calculated. It is concluded that considering the water resistance to slices entering water is more coincident to practical force condition. The water resistance has great influence on the acceleration, velocity of landslide. When the water resistance is not considered, with the increasing of numbers of slices entering water, the acceleration of landslide increases firstly, then it decreases, and the tendency will not rebound. When the water resistance is considered, the value of water resistance is related with velocity of landslide and area of slope surface; under the comprehensive effect of these two factors, the acceleration of landslide may increase after its decreasing tendency.

Key words: velocity of landslide, formulas advised by, American Society of Civil Engineers, movement equation method, water resistance, height of initial surge