Abstract:

Slope stability is influenced by numerous of factors, some of which are uncertain in order that they are difficult to be characterized by means of classical mathematical theories and mechanical models. Two-stage fuzzy comprehensive evaluation method is adopted. Different methods are utilized to obtain the membership degrees of discrete and continuous factors which influence the slope stability. The weight values of each factor are afforded by meands of comparative analysis of binary. Besides, the significant impact of rainfall should be taken into account. The weight values of each factor after rain are modified and a calculation model of two-stage fuzzy comprehensive evaluation is put forward in terms of slope stability. The different characteristics and the regularity of distributions are fully considered in membership functions. Considering the changes of weight values before and after rain increasingly rationalizes the evaluation results. In the concrete project, The method of fuzzy comprehensive evaluation is applied in an example and the results have a good agreement with classical limit equilibrium method, which the slope is stable before rainfall while it is less stable after rainfall.

Key words: slope stability, rainfall, membership function, weight of the amendment, fuzzy comprehensive evaluation