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

The most widely used and the best known rock mass classification, the RMR system doesn't represent local geological characteristics enough. The canonical correlation analysis was carried out with 3 kinds of face mapping data obtained from granite, sedimentary rock and phyllite in order to clarify a discrepancy between rock types. According to analysis results, as a type of rocks changes, RMR factors have different influences on the total rating of RMR. Based on the result, this study shows there is necessity to adjust rating ranges of each of RMR parameters according to engineering geological units. (A) This paper was presented at Safety in the underground space - Proceedings of the ITA-AITES 2006 World Tunnel Congress and the 32nd ITA General Assembly, Seoul, Korea, 22-27 April 2006. For the covering abstract see ITRD E129148. “Reprinted with permission from Elsevier”.