Abstract: Rockfall is a common geological hazard in mountainous areas. With the construction of power transmission lines in mountainous areas, the rockfall on the upper part of mountain slopes are potentially more and more harmful to the transmission line towers at the middle and lower parts of the slope. In this paper, a 110kV Shuntan Line 97JHJ tower base slope rockfall hazard evaluation is presented. The evaluation applies principles of the Newtonian motion and the energy conservation, the trajectory model of rockfall is established. The Rn and Rt are used as the parameters for predicting the rebound of the rolling rocks, and the slope friction angle is used as the parameters for the evaluation of the rolling and sliding of rockfalls. The distance, speed and kinetic energy of the rockfalls are simulated by the software to analyze the mechanism of the rolling rocks. Following the principles of the prevention first, remediation as supplement, and combination of prevention and remediation, the three measures of the prevention and treatment of rockfalls are compared and analyzed. The actual sitespecific conditions are taken into the consideration and the appropriate protective measures are implemented. This evaluation process can provide reference for the design and construction of similar projects.

Key words: Rockfalls, Slope, Mechanism, Protection