Abstract
Abstract The failure of slope is a progressive process, and the whole sliding surface is caused by the gradual softening of soil strength of the potential sliding surface. From this viewpoint, a local dynamic strength reduction method is proposed to capture the progressive failure of slope. This method can calculate the warning deformation of landslide in this study. Only strength parameters of the yielded zone of landslide will be reduced by using the method. Through continuous local reduction of the strength parameters of the yielded zone, the potential sliding surface developed gradually and evolved to breakthrough finally. The result shows that the proposed method can simulate the progressive failure of slope truly. The yielded zone and deformation of landslide obtained by the method are smaller than those of overall strength reduction method. The warning deformation of landslide can be obtained by using the local dynamic strength reduction method which is based on the softening characteristics of the sliding surface.
Highlights
Landslides pose great threat to society; landslide forecast has been at the Received: 12 April 2012 Accepted: 20 September2012 forefront of landslide research (Evans et al 2002)
Many landslide forecast models and criteria have been proposed, landslide forecast practice has shown that the existing forecast models can not accurately forecast landslide deformations
Example shows that the proposed method can simulate the progressive failure of slope and calculate the early warning deformation of landslide
Summary
Landslides pose great threat to society; landslide forecast has been at the Received: 12 April 2012 Accepted: 20 September2012 forefront of landslide research (Evans et al 2002). Landslide deformation is a progressive process (Petley et al 2005; Eberhardt et al 2008; Leroueil et al 2012); forecast models that do not adequately account for the progressive slope deformation can not forecast landslide accurately and reliably. The strength reduction method can not capture progressive failure and deformation process of landslide. Local dynamic strength reduction method was proposed to simulate the progressive failure of the gravity-induced landslides based on the softening of the strength of the sliding surface. The mechanical parameters of yielded element are reduced gradually in the process of computation reduction, making the slope body gradually fail and the potential sliding surface is searched out automatically. Example shows that the proposed method can simulate the progressive failure of slope and calculate the early warning deformation of landslide
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