基于变权重区间模糊评判法的岩体质量评价

针对现有岩体质量分类方法存在的不足,提出一种岩体质量的变权重区间模糊评判法。该方法精细地构建了RMR分类体系中岩石单轴抗压强度、RQD、节理间距、节理条件和地下水条件5个指标的隶属函数,并通过采用归一化的贴近度替代隶属度,克服了现有方法中当部分指标值区间模糊分布时存在的误差;为使评价结果更符合实际需求,采用变权法突出劣态指标在岩体质量分级决策中的重要性。工程实例验证结果表明,提出的新方法相比RMR法有更强的适用性。

Variable weight interval fuzzy evaluation method for rock mass quality

To improve the existing rock mass classification methods, we proposed a variable weight interval fuzzy evaluation method for rock mass quality rating. Firstly, the membership functions were finely established for indexes in RMR classification system, including rock uniaxial compressive strength, RQD, joint spacing, joint condition and groundwater condition. Besides, the normalized closeness degree was used to replace the membership degree to overcome the existing error when some index values are fuzzy due to distribution interval. Further, the variable weight method was applied to emphasize the importance of the inferiority index in the rock mass grading decision, making the evaluation result more accordant with the practical demand. For verification, the new method was applied to a practical example, which showed the proposed method was more applicable in comparison with the RMR method.