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A Suggestion of the Modified Weighting Values of the RMR Parameters Using a Multiple Regression Analysis on Rock Slopes  

Chae Byung-Gon (Korea Institute of Geoscience and Mineral Resources)
Kim Kwang-Sik (Dept. of Earth & Environmental Sci. & Institute for Basic Science Research, Chungbuk National University)
Cho Yong-Chan (Korea Institute of Geoscience and Mineral Resources)
Seo Yong-Seok (Dept. of Earth & Environmental Sci. & Institute for Basic Science Research, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.16, no.1, 2006 , pp. 85-96 More about this Journal
Abstract
This study was conducted to suggest a method to determine weighting values of each parameter of the RMR system considered with geologic characteristics of a study area. This study reviewed the weighting values of the RMR system for the Cretaceous sedimentary rocks distributed in Ulsan area. Based on the data of field survey at the study area, a multiple regression analysis was used to set up an optimal weighting values of the RMR parameters. For the multiple regression analysis, each parameter of the RMR and the slope gradient were regarded as the independent variable and the dependent variable, respectively. The analysis result suggested a modified weighting values of the RMR parameters as follows; 30 for the intact strength of rock; 18 for RQD; 8 for spacing of discontinuities; 32 for the condition of discontinuities; and 12 for ground water.
Keywords
RMR system; weighting values; geologic characteristics; the Cretaceous sedimentary rocks; multiple regression analysis;
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