Collapse of dangerous rocks is one of the most common geological dynamics hazards of high and steep shallow rock slope. It is sudden and strong

random

high speed and violent; so it is the focus of slope engineering survey. On the base of on-site investigation of dangerous rocks of Tibet Zhangmu Mountain

the distribution range of dangerous rock bodies is analyzed. The trajectory of collapse dangerous rocks

speed and characteristics of the body collapse accumulation of the different coefficients of friction is simulated by PFC3D in the condition of rainfall. The results show that the trajectory of collapse dangerous rocks is influenced by topography of slope

multiple impacts with the ground and repeated changes of direction

simplifying dimensional calculations may draw the wrong conclusions. Slope surface coefficient of friction affect the accumulation of forms of collapse of dangerous rocks

the smaller friction coefficient

the farther accumulation body position

and the easier performing flow state. Slope coefficients of friction 1.2

the simulation results are more consistent with the actual; The area of collapse dangerous rocks is the lower cliffs from Armed two camps to Zhangmu trench opening. PFC3D simulation of dangerous rocks collapse body movement can initially determine three-dimensional accumulation form and the influence scope

and provide a useful reference for disaster prevention and mitigation engineering design.