基于D-S证据理论的岩体质量分级组合评价方法

现有岩体质量分级方法评价结果存在非一致性的问题.为此,在组合评价思想的基础上,选取多种岩体质量分级方法作为基础分级方法,建立了岩体质量分级组合评价计算模型.并考虑到D-S证据理论是一种较严谨的不确定性推理方法,其具有较强的信息融合能力,并且能够反映不同信息之间的一致性和冲突性,将其引入建立一种新的组合评价方法合成规则.然后,针对D-S合成规则需要解决确定基础分级方法基本概率分配函数这一问题,引入欧氏距离建立基础分级方法基本概率分配函数的确定方法,从而最终建立基于D-S证据理论的岩体质量分级组合评价方法.最后,工程实例分析表明,3种基础分级方法存在冲突性,但是D-S证据理论能够较好地解决这一问题.

Combination Evaluation Method for the Classification of Rock Mass Quality Based on D-S Theory of Evidence

There are some inconsistency issues in the evaluation results obtained by different rock mass classification quality methods. According to the combination evaluation idea, several fundamental methods were introduced to build the model for the classification of rock mass quality. The Dempster-Shafer theory of evidence is a very rigorous uncertainty reasoning method with strong capability for information fusion and reflects the consistency and conflict of different information. This paper introduced the D-S theory of evidence to establish a new synthetic rule for the building of a new model of the combination evaluation. Then, due to the combination rule of D-S theory of evidence, which is difficult to define the basic probability assignment, Euclidean distance was introduced to build a method to define the basic probability assignment, and ultimately the combination evaluation method for the classification of rock mass quality based on D-S theory of evidence was established. Finally, a practical project shows that confliction exists in the three fundamental methods but D-S theory of evidence can solve this problem.