中文摘要：

基于滑坡气垫层学说，分析了大型岩质滑坡高速滑动的成因和整体滑动的动态过程，提出了判断滑坡产生高速的必要条件，即滑坡厚度大于临界厚度；并提出了库岸高速岩质滑坡运动过程分析模型，即将整个过程分为4个阶段：初始滑动阶段、开始运动至加速度增大至最大阶段、继续加速阶段和减速至停止阶段。运用分阶段运动过程分析模型，以千将坪滑坡为例，计算了其各个阶段的速度、加速度及滑动距离，并与前人已有的研究成果进行了对比，验证了模型的合理性。与动能定理相比，该计算模型可以较好地分析滑坡速度的动态变化，可以较直观地反映滑坡入水的最大速度，为滑坡涌浪的首浪分析奠定了基础。

英文摘要：

The authors have analyzed the origin of high velocity of large rockslide and the development of the whole movement based on the air cushion layer theory, and proposed the necessary condition of high speed, which is the thick of landslide should be greater than the threshold value. The whole movement is divided into four stages： the initial stage, moving to when the acceleration reached to the highest, continuingly moving to the highest speed and deceleration to stop. Taking Qianjiangping landslide for example, the rationality of above model is approved by calculating velocities, accelerations and distances of all stages, and comparing the results with the former study. Compared to kinetic energy theorem method, the stage method can reflect the changing of velocity during the movement and display the highest velocity directly, which could lay a foundation of analyzing the first wave of wave hazard.