采用BQ和Q两种岩体质量分级系统对某抽水蓄能电站地下厂房围岩岩体质量进行分级，并指明了岩体质量较差部位，结果表明，该地下洞室围岩岩体质量等级以Ⅱ级、Ⅲ级为主。根据勘探平洞洞壁波速测试结果发现：Ⅱ级、Ⅲ级围岩岩体波速为4200~5300 ms-1，相应平洞岩体自稳性好，Ⅳ级、Ⅴ级围岩波速一般小于4000 ms-1，特别是Ⅴ级围岩波速一般小于2200ms-1。根据对不同分级法得到的岩体质量指标相关性分析结果表明，两种分级法得到的岩体质量指标之间呈指数关系，波速-呈线性关系。对同一工程，岩体质量评价的两种分级方法所得的分级结果不同，但是它们的分级基础是相似的，即都以地质因素为主导，因此各种分级方法之间是可以换算和对比的。
The rock mass quality surrounding the underground plant of a pumped storage station is classified with BQ and Q classification systems. The distribution of rock masses with poor quality is pointed out. The results indicate that the rock mass quality is commonly at the gradeⅡor Ⅲ. On the other hand, the result of wave velocity testing shows that the wave velocity of the rock mass of gradeⅡor Ⅲ is between 4200~5300 ms-1, and these rock mass has good stability. However, the wave velocity of the grade Ⅳand Ⅴ is less than 4000 ms-1. Especially, the rock mass wave of the grade Ⅴ is less than 2200 ms-1. The rock mass quality indices from the two classification systems have similarities. The two indices have the relationship of exponential function. The relation between wave velocity and \[BQ\] is linear. For the same project, the classification results from the two classification systems are different, but the classification bases are similar, which are dominated by the geological elements. So, there are the methods for conversion and comparison between the two classification systems.