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巷道围岩分类是地下工程支护形式的主要依据，随着岩体力学的发展和测试手段的不断完善，人们提出了各种各样的岩体分类系统，有的以单因素指标为分类依据，有的以多因素指标综合分类．而近年出现一种新的趋势，就是力求把稳定性分析和定量评价统一起来，使岩体分类尽可能切合实际．本文提出采用模糊贴近度方法来确定开挖岩体类级，根据岩体类级选择合理的支护措施．
Surrounding rock classification is the main basis of underground engineering support form, with the development of rock mechanics and testing methods continue to improve, people have proposed a variety of rock mass classification system, and some single-factor index as the basis for classification , And some multi-factor index comprehensive classification. In recent years, there is a new trend that seeks to unify the stability analysis and quantitative evaluation so as to make rock mass classification as realistic as possible. In this paper, the method of fuzzy close degree is proposed to determine the rock class of rock excavation and the reasonable support measures according to the class of rock mass.