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Abstract Large consequent bedding rockslides widely exist in nature，which are one of the major types of landslides and have been the focus in landslide research area. Based on development morphology of sliding surface，consequent bedding rockslide is divided into two categories：advancing consequent bedding rockslide and regressive consequent bedding rockslide. It reveals from the mechanical point that the nature of progressive failure of consequent bedding rockslide is weakening process of mechanical parameters of landslide. It reflects in the constitutive equation of sliding zone is the reduction of the initial shear stiffness. Thus，ratio of the shear stiffness of weaken sliding zone to initial shear stiffness is defined as the weakening coefficient of sliding zone；and the S-shaped curve is introduced to depict the spatial characteristics of the weakening coefficient in sliding zone. Based on the characteristics of large consequent bedding rockslide，the progressive-locking mechanical model is proposed；and its mathematical expression is given. The model could well reflect the characteristics of the timeliness and spatial variability of mechanical parameters of sliding zone in the progressive failure process of the landslide. Finally，formulas and steps for calculating the stability of progressive failure landslide under this model are put forward. The model is applied to the case of Jiweishan landslide in Wulong county to analyze its stability before sliding.
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Received: 17 May 2012
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2012, Vol. 31 
