Assessment of the Stability of Rock Slopes by the Slope Stability Rating Classification System |
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| Authors: | Abbas Taheri Kazuo Tani |
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| Institution: | (1) Department of Civil Engineering, Tokyo University of Science, 2641 Yamazaki, Noda Chiba, 278-8510, Japan;(2) Department of Civil Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan |
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| Abstract: | Given the lack of suitable systems in the characterization of slope stability of heavily jointed rock masses, a new rock mass
classification system called Slope Stability Rating (SSR) is proposed. In addition to the so-called modified Geological Strength
Index, the proposed system considers five additional parameters whose relative effects on the stability of fractured rock
slopes were precisely examined based on data retrieved from eight different rock slope sites in Iran. An overall rating for
the rock mass is obtained from the summation of the individual ratings of each parameter. A number of design charts are provided
as illustration. The new system was then validated based on 46 slope case histories from Iran and Australia. For this, by
means of the design charts previously mentioned, a recommended stable angle for each slope was given and compared with the
current slope conditions. As a result, SSR design charts for maximum excavation angle (FS = 1.0) and also for other more conservative
excavation angles (FS = 1.2, 1.3, 1.5) were presented. |
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