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Abstract The energy analysis for the stress field and displacement field of the locked slope body indicates that：in the case that the thickness of locked slope body bring up the rear is large and the slope body consists of solid rock，enormous shear deformation energy accumulates in the slope system under the action of huge thrust of middle and rear slope body，which makes that the shear deformation energy released by the slope system far exceeds the energy for failure of rock body of latent slide belt in the critical slide and sheared locked slope body. The superfluous deformation energy converts into kinetic energy of slide body in impulse condition，which leads to an acute-moving landslide. The curve of shear deformation energy change rate of locked slope body and its expression，which contains an abundance of information，are deduced. Through the shear deformation energy change rate curve and the load-deformation curve of latent slide belt of locked slope body bring up the rear，the shear deformation energy accumulation of the slope system and the relationship between the deformation energy releasing amount in critical slide and the starting impulse velocity of the landslide body are described in the forms of direct geometry way；and a calculating example about the impulse velocity of the acute-moving landslide is given.
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Received: 21 January 2011
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2011, Vol. 30 
