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Estimation of Joint Roughness Coefficient(JRC) using Modified Divider Method  

Jang Hyun-Shic (Dept. of Geophysics, Kangwon National University)
Jang Bo-An (Dept. of Geophysics, Kangwon National University)
Kim Yul (Highway & Transportation Technology Institute, Korea Highway Corporation)
Publication Information
The Journal of Engineering Geology / v.15, no.3, 2005 , pp. 269-280 More about this Journal
Abstract
We assigned points on surface of standard roughness profile by 0.1mm along the length and measured coordinates of points. Then, the lengths of profile were measured with different scales using modified divider method. The fractal dimensions and intercepts of slopes were determined by plotting the length vs scale in log-log scale. The fractal dimensions as well as intercepts of slopes show well correlation with joint roughness coefficients(JRC). However, multiplication of the kactal dimension by intercept show better correlation with IRC and we derived a new equation to estimate JRC from fractal dimension and intercept. The crossover length in which we can determine the correct fractal dimension was between 0.3-3.2mm. We measured joint roughness of 26 natural joints and calculated JRC using the equation suggested by Tse and Cruden(1979) and new equation derived by us. IRC values calculated by both equations are almost the same, indicating new equation is effective in measuring IRC.
Keywords
joint roughness coefficient(JRC); standard roughness profiles; modified divider method; fractal dimension; intercept;
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