金沙江白格滑坡残留体稳定性分析与防治对策

金沙江白格滑坡在经历了2018年10月和11月的2次滑动堵江后,在其后缘仍存在K1、K2和K3等3处规模较大的残留崩滑体,并有再次失稳堵江的可能。目前关于残留体稳定性的研究还存在较大争议,多从影响因素及成因机制等方面进行定性分析,其结果依赖于评价者的经验,差异较大。在野外调查的基础上,针对白格滑坡所在区工程地质条件及其残留体变形特征,选取坡高、坡度、坡面形态、临空面、地下水出露、裂缝发育和变形等7个因素作为评价因子,基于模糊综合评判模型,运用层次分析法对白格滑坡残留体进行分区稳定性评价,并提出相应的防治对策。评价结果表明:K1与K2残留体稳定性较差;K3残留体基本稳定,与实际调查状况较吻合。研究结果可为同类型滑坡的评价与防治提供参考。

Stability Analysis and Prevention Countermeasures for Residual Bodies of Baige Landslide in Jinsha River

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.