Abstract：When evaluating geological strength index(GSI)，there are great randomness and fuzziness to confirm the value of its basic elements. As a consequence，it is difficult to accurately measure the impact of each influential factor. The fuzziness of the parameter of rock mass characteristics reflects its inherent uncertainty. The fuzzy mathematics theory provides strong measures to depict these characteristics. This article introduces the number of joint sets(Jn)，joint spacing(l) and the integrity coefficient of rock mass(Kv) to describe the structure features of rock mass and introduces large-scale waviness(Jw)，small-scale smoothness(Js) and joint altered coefficient(Ja) to describe the conditions of structural planes. Then multifactor fuzzy-synthetical evaluation is applied to the system of GSI. Meanwhile，analytic hierarchy process is adopted in determining the weight of each factor. As a result，the model of fuzzy-synthetical evaluation of GSI is established. Project applications prove that this evaluation method has strong pertinence and high accuracy and it can organically combine geological surveys，experiment data，statistics and expert opinions，so this evaluation method can decrease the subjectivity of researchers? decisions. The method of fuzzy-synthetical evaluation of GSI does provide a new approach to quantizing GSI system.
HOEK E. 实用岩石工程技术[M]. 郑州：黄河水利出版社，2002：143-146.(HOEK E. Practical rock engineering[M]. Zhengzhou：Yellow River Water Conservancy Press，2002：143-146.(in Chinese))
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2013, Vol. 32 
