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Abstract Rockfall hazard has a greater threat on the construction workers，equipment and structures during the engineering construction process，so that it?s important to understanding the motion characteristics and the impact force of rockfall. Based on the kinematic principles of rigid material，a calculation method is presented to simulate the motion characteristics of rockfall. The reasonable of the presented method is validated by comparison analysis of theoretical values and numerical results，and the motion parameters of rockfall are used to compute its impact force on structures. On the basis of considering the self-rotation of rockfall，a computational method for determination of impact force is presented base on impulse theorem，and the difficult problem for determining of the impact time is solved by use of elastic mechanics. The presented method is adopted to determine the motion characteristic parameters and impact force of the rockfall hazard at the natural slope of Changheba Hydropower Station. Simulated results show that，during the movement process of rockfall，the maximum jumping height is 25 m，the maximum translational velocity and rotational speed are 57 m/s and 350 rad/s，respectively；and influenced by the terrain condition. Combined with the motion parameters of rockfall and theoretical model for impact force，the impact force of rockfall effect on structure at different locations are determined，the calculation results have a great reference value to the location selection of structures and the hazard mitigation and prevention of rockfall.
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2015, Vol. 34 
