Abstract：In order to meet the measurement requirements of joint roughness coefficient(JRC) in the condition of engineering practice，statistical analysis and numerical simulation method were adopted to carry out the vector analysis of the Bartons standard roughness rating profile curves and some undulate shape of practical rock joints. Taking the measurement condition of joints surface morphology fully into account，relative waviness Ra and elongation R were determined to evaluate JRC. At the same time，the standard roughness rating profile curves were classified as flat，wavy and serrated. Eventually experiential formulas were established and expressed by images and the sensitivity of JRC relative to the change of R and Ra was analyzed and the Bartons standard roughness rating profile curves were expressed by functions. Consequently，the quantitative determination of JRC and the fast calculation of joint shear strength using JRC-JCS model can be achieved.
2014, Vol. 33 
