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中文摘要：
首先，在全面深入分析地下结构岩体质量影响因素的基础上，确定出其主要影响因素。然后，根据影响因素的层次性和各种影响因素对岩体质量分类影响的模糊性特点，引进模糊数学理论，建立地下结构岩体质量分类的二级模糊综合评判模型，并解决有关模糊评判隶属度与常权向量确定方法及其运算规则等问题，从而建立地下结构岩体质量分类的二级模糊综合评判方法。最后，引进变权处理的思想，建立岩体质量分类的变权重二级模糊综合评判理论与方法，减少评判的主观性，从而使评判结果更趋合理化。通过工程实例计算并与同类方法进行比较分析，分析结果表明该方法的可行性与合理性。
英文摘要：
First, the main factors for the classification of rock quality are selected by carefully analyzing all the influencing factors of rock quality in underground structures. Then, on the basic of analyzing the relationship of the influencing factors and fuzzification of rock quality, the model of two-stage fuzzy synthetic judgment is established to classify the rock quality by using fuzzy mathematics theory. After solving the problems of determining degrees of membership, basic weight value, and erecting their algorithm, a method of two-stage fuzzy synthetic judgment is developed. Finally, by using the idea of changing weight value, the theory and method of two-stage fuzzy synthetic judgment with changing weight value on the classification for rock quality is brought out, which can reduce the influence of subjectivity of judgment on the classification of rock quality and make it more reasonable. Compared with other classification methods, it shows that the proposed classification method is both practicable and reasonable.
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