关键词: 力学参数, 随机-模糊法, 置信度, 隶属函数

Abstract: The values of rock sample are random and fuzzy.Both of the random-fuzzy approach and the traditional method were applied to analyze the mechanical parameters of slope engineering.After comparison，it is concluded that the random-fuzzy approach is superior to the traditional method.Also，the confidence degree and probability distribution form of mechanical parameters were discussed.Then，the confident threshold concept was proposed so as to provide a foundation for its application in engineering practice.

Key words: Mechanical parameter, Random-Fuzzy Method, Confidence, Membership functions