中文摘要：

崩塌是“5·12”汶川地震诱发的主要次生地质灾害之一，在对灾区村镇大量崩塌体现场调查的基础上，将崩塌危岩体的运动过程分为自由落体、弹跳和滚动3个阶段，建立了各阶段运动过程的数学模型．以灾区九寨沟杨家岩崩塌体为例，计算了危岩体的运动速度、滚动距离和冲击力，为灾后重建中崩塌体的治理提供了依据．

英文摘要：

Collapse is one of the major secondary geological disasters induced by Wenchuan earthquake on May 12th, 2008. Based on many on-site investigations of collapse bodies in disaster areas, the movement process of unstable rock masses is divided into three stages of free-fall, bouncing, and rolling. Mathematical models of the three stages are established separately. Yangjiatai collapse body in Jiuzhaigou is taken as an example. Its velocity of unstable rock masses, rolling distance, and impact force are calculated. The models can provide a basis for the treatment design of the collapse bodies in the disaster reconstruction process.