Adjustment of maximum ratings of RMR parameters using a canonical correlation analysis

摘要

In Korea, the RMR and the Q-system are most widely used for the rock mass classification method in designing tunnels. Since these systems do not consider local geological characteristics and use the same rating ranges for every rock types, they cannot sufficiently present the engineering anisotropy of rocks. Therefore, there is low reliability in selecting support categories with rock mass classification results. This causes frequent design changes in tunnel supports and gives one of reasons to collapse during tunnel construction. Therefore, there have been many studies on how to classify rock masses, reflecting geological characteristics. In this study, tunnel face mapping data of 3 tunnels excavated in massive granites, anisotropic phyllites, and sedimentary rock are analyzed to find out how geological anisotropy affects the observation of face mapping. And the canonical correlation analysis was carried out to clarify a discrepancy of rock mass classification caused by differences of geological characteristics. And we would like to introduce adjustments of maximum ratings of RMR parameters.