Abstract:

After the Baige landslide in Jinsha River experienced two times of sliding and blocking the river, the main body material of the landslide was greatly reduced, but there were still three large residual bodies in its trailing edge, i.e., K1, K2 and K3. Whether it has the possibility of again losing stability and blocking the river has become the focus of current work. The stability evaluation of landslide residues is mainly based on the factors of influence and the mechanism for the qualitative analysis, the results is more artificial due to the experience of the valuator. On the basis of field investigation, according to the engineering geological conditions and deformation characteristics of the area where the Baige landslide is located, seven factors such as slope height, slope angle, slope shape, free surface condition, groundwater seepage, fracture development and deformation were selected as evaluation factors, and based on AHP the fuzzy comprehensive evaluation model is used to evaluate the stability of the partition of Baige landslide. The evaluation results show that the stability of K1 and K2 residues is poor, and that of K3 residues is basically stable, which is in line with the actual survey status. The corresponding prevention and control countermeasures are put forward. The results can provide a valuable support for the evaluation and prevention of the same type of landslide.

Key words: landslide residue, stability, fuzzy comprehensive evaluation, prevention suggestion, Baige landslide