Abstract: Researching the relationship between rockfall’s impact force and rockfall velocity is of great significance for the prevention and remediation of rockfall hazard. The impact force of rockfall involves many factors, among which velocity is the most influential factor. In this article, the relationship between rockfall velocity and impact force was researched through indoor impact test. First, marble ball was released to hit rectangular slabs made of different materials. Second, the rockfall’s impact force was recorded through sensors and rockfall movement by using camera. Third, the instantaneous velocity at the moment of hitting was calculated, and some related data were obtained. Results reveal that the large rockfall movement velocity (V), the greater the impact force (F) of rockfall. According to the results and the fitted data, the velocity and impact force are in a power function relationship, i.e. F is positively related with V^1.35.

Key words: rockfall, impact force, velocity, sensor, power function relationship