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Abstract Because of lack of internal energy dissipation law of landslide in the sliding and impact processes，we can not calculate the impact energy precisely. In order to solve this issue，the landslide models are designed and constructed according to the similarity principle. The measurement system of friction coefficient is made up of photoelectric sensor and electronic timer；and the measurement system of impact force is made up of dynamic soil pressure sensor and dynamic strain acquisition instrument. A measurement method of impact energy is proposed for the situations of perfect elastic collision and completely inelastic collision. The impact energies of landslide mass with the same weight and different particle sizes are tested. The results show that the impact energies decrease markedly with the particle size decreasing. And the reasons are that：the internal energy dissipation of landslide mass increase with the particle sizes decreasing；and the friction coefficient between the landslide mass and sliding path increases also，which adds to the friction energy dissipation. Based on the experiment analysis，two methods are proposed to calculate the impact energy，which provide reference for the further research，under the condition of unknown internal energy dissipation mechanism. The comparison with the existing method indicates that：for the landslides composed of all kinds of particle sizes，the result of method ignoring the inner energy dissipation is bigger than the proposed two methods；and the differences increase with the particle size decreasing.
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Received: 18 November 2010
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2011, Vol. 30 
