可拓评判方法在岩体质量分类中的应用

岩体质量分类方法多种多样,考虑的因素有多有少。但不同分类方法中考虑的因素,由于评分标准的不同不可以任意相互选用,导致了传统岩体质量分类方法的局限性。可拓评判则从可拓集合理论出发,建立多指标性能参数的质量评定模型,通过定量的数值表示评价结果,这种评判方法最大的优点是可以从各种分类方法中选用不同的考虑因素进行综合评价,这样可以使评价指标最优化地接近实际的工程地质情况,分类结果自然比传统分类方法更加准确。结合隶属度的概念,应用可拓理论对岩体进行分类,从不同的分类方法中选取最适合工程实际的评价指标,提出了一种定量的指标权重的确定方法,较好地解决了工程中的实际问题。

APPLICATION OF EXTENICS IN EVALUATING OF ENGINEERING QUALITY OF ROCK MASSES

There are various methods for evaluating engineering quality of rock masses,and indexes for different methods are different. Those different factors or indexes in different methods cannot be employed together due to the difference in the evaluation standard of different methods. This leads to the limitation of the traditional evaluation method. Based on extenics,a quantitative evaluation model of rock mass quality of multiple parameters is developed. The advantage of this model is that different factors from different traditional evaluation methods can be considered simultaneously. For example,the factor RQD in RMR can not be used together with the factor Jr in Q system previously because of differences in evaluation standard. But through linear dimensionless method, factors are converted to dimensionless numbers,so those two factors can be used together. Based on the concept of degree of membership and extenics,different factors from different traditional methods are selected and converted to dimensionless numbers. A quantitative method for define the weight of those factors are put forward according to importance of factors. The results of a case show that this evaluation method is feasible.