In order to get more practical uncertain results, according to different stability states, common slopes are devided into five kinds. Every kind of slopes is assigned a value of certain classified standard. A fuzzy assemblage analysis model is obtained based on the relationship of fuzzy equivalency. Because there are many influence factors for the stability of rock slope, the two-stage comprehensive evaluation model and different distribution of index values are adopted. Combined with practical examples, it may be seen that the results of analysis can more fully represent the assessment of the degree of slope stability, and are in good coincidence with the field observation values.

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