Abstract
The shear strength of jointed rock is influenced by effective normal stress, joint wall compressive strength and joint roughness. Since joint roughness has considerable influence on the shear strength of jointed rock, many studies have been conducted to get a quantitative joint roughness value. Until now, Joint Roughness Coefficient (JRC) proposed by Barton has been prevalently used as a rock joint roughness parameter in spite of its inherent disadvantages. In this study, a quantification of rock joint roughness is performed using the surface roughness parameter, RS and the proposed method is applied to rock core specimens. Based on the quantification of joint surface roughness, joint shear tests are performed with the portable shear box. The relationship between joint surface roughness and joint shear strength is investigated and finally, a new peak shear strength criterion for rock joints is derived from these results. The criterion has considerable credibility and originality in that it is obtained from laboratory tests and expressed with quantified roughness parameters. (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”.
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