Innovative consideration of a directional appraisal parameter as destabilized criterion of the colluvial landslide

摘要

As the instability criteria of the singular dimension displacement of a landslide are limited and insufficient, a new appraisal parameter, the vertical displacement direction rate is considered in landslide stability model in this paper. Then, the displacement directional rate variation at different evolutional stages of landslide stability and its significance in landslide forecasting are systematic analyzed. On the basis of the different evolutional rules of the vertical displacement directional rate in the different deformation stages, the destabilized criterion of this kind of parameter is established in terms of the principle of statistics. Furthermore, according to the destabilized criterion, a calculation and evaluation of the stability of Xintan landslide is carried out by means of the appraisal parameter of the vertical displacement direction rate. The result of analysis is basically consistent with the practical deforming law of the landslide. The result above indicates that the vertical displacement direction rate is an effective appraisal parameter serving as an essential and stable criterion for the stability evaluation of a slope. Therefore, this directional appraisal parameter is of very special significance and also suitable and effective in the prediction of landslides.