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Experimental Study on Load Transfer Characteristic by Adjacent Slope Excavation in a Jointed Rock Mass  

Lee, Jin-Wook (한국철도기술연구원 철도구조연구실)
Lee, Sang-Duk (아주대학교 환경건설교통공학부)
Publication Information
Journal of the Korean Society for Railway / v.12, no.2, 2009 , pp. 321-328 More about this Journal
Abstract
A optimal reinforcement in the joint rock slope excavation adjacent to an existing tunnel would be influenced by excavation distance from the tunnel, slope angel, and joint conditions but has been empirically determined so far. In this study, large scale model tests were conducted to find out the relationship between load translation on the excavation surface and bebavior of the tunnel according to excavation steps of the jointed rock slope. Consequently, two main parameters, joint dip and sloped angle were investigated in those model tests. From the test results, it was found that tunnel deformation was the largest one when the excavation of joints located closer to the tunnel crown or invert. Stability of the slope and the tunnel were varied in a certain excavation stage related to the angle of slope. In the future, based on results of this study the reinforcement method for the tunnel and slope safety in a jointed rock mass will be demonstrated.
Keywords
Joint rock mass; Slop excavation; Bebavior of tunnel; Horizontal pressure; Load transfer;
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