基于改进未确知测度的含软弱夹层巷道围岩稳定性评价

Stability Evaluation for Surrounding Rock of Roadway with Weak Intercalation Based on Improved Unascertained Measure Theory

为了准确评价含软弱夹层巷道围岩稳定性,以改进层次分析法和客观赋权法(CRITIC方法)计算综合权重,应用未确知测度理论(UM)计算未确知测度向量,同时引入集对分析理论(SPA)优化置信度评价过程,建立UM⁃SPA耦合分析模型,并运用该模型对某金矿含软弱夹层巷道围岩稳定性进行评价。结果表明,地应力、软弱夹层抗拉强度和软弱夹层厚度是影响该类巷道稳定性的主要因素;断面D4、D5、D6、D7、D9的集对势为微反势,有向不安全状态偏向趋势;巷道稳定性从大到小排序为:290#水平>150#水平>90#水平。实践验证表明,模型评价结果与实际吻合。

In order to accurately evaluate stability of surrounding rock of roadway with weak intercalation,an improved analytic hierarchy process and criteria importance through inter⁃criteria correlation(CRITIC)method,were adopted to determine comprehensive weight,and unascertained measure theory(UM)was used to determine unascertained measurement vector.Furthermore,the set pair analysis theory(SPA)was introduced to optimize confidence evaluation process,and then a UM⁃SPA coupling analysis model was established and used to evaluate the stability of surrounding rock of the roadway with weak intercalation in some gold mine.The results show that in⁃situ stress,tensile strength and thickness of weak intercalation are the main factors influencing the stability of such kind of roadway.The set pair potentials of sections D4,D5,D6,D7,and D9 belong to micro⁃reversal potential and tend to be unsafe.The stability of roadway at different levels is in the following descending order:290#level>150#level>90#level.The practical verification has proven that this model has an evaluation result consistent with the actual situation.