基于组合赋权–未确知测度理论的围岩稳定性评价

Evaluation of rock stability based on combined weighting-unascertained measurement theory

针对岩体围岩稳定性评价多指标性和不确定性的特点,使用改进的层次分析法和熵值法确定各影响指标权重,并在此基础上,提出一种新的组合赋权规则,得到相对客观准确的结果。依据岩体围岩稳定性影响指标和分级标准,甄选了6个定性指标和8个定量指标,采用组合赋权–未确知测度理论耦合评价模型,构建了评价指标未确知测度函数、评价指标组合赋权值、置信度判别准则,对研究评价12处围岩断面进行了稳定性评价,获得了每个围岩断面稳定性等级,并与现场评价和模糊理论评价结果对比,评价结果基本符合实际情况。研究表明:岩体围岩稳定性的组合赋权–未确知测度模型是一种科学合理的方法,确保了评测对象信息的完整性和评测结果的客观性、准确性、可靠性,为工程岩体围岩稳定性的评价分级提供了一种新思维,具有工程实践指导意义。

Owing to multi-objectivity and uncertainty in the evaluation of rock stability, the modified analytic hierarchy process（AHP） and the entropy method are used to calculate the weights of factors. On this basis, a new combination rule is proposed to determine the weight which can help us to get a relatively objective and accurate result. According to the influence factors and grading standards of the rock stability, six qualitative indices and eight quantitative indices are selected. Based on the combined weighting-unascertained measurement theory coupled valuation model, the stabilities of 12 surrounding rocks in the study area are assessed and analyzed by using the unascertained measurement function, combination weighting and confidence criterion. The stability of each surrounding rock is obtained. Compared with the results of field evaluation and fuzzy matter-element, the evaluated results are consistent with the actual situations. Therefore, the combination weighting- unascertained measurement theory evaluation model is scientifically reasonable for the rock stability. The integrality of assessment object information is ensured, and the accuracy, objectivity and reliability of the evaluated results are guaranteed. The proposed model can be applied to the actual projects.