| Summary: | 碩士 === 國立中央大學 === 應用地質研究所 === 94 === “Rock Avalanche” with long runout distance frequently bring out great loss of life and property. Consequently, evaluations of the susceptibility of rock avalanche and its influence zone are important. In this study, the stable angle (FS=1) of non-structural control failures using Bishop’s method was evaluated. Using nonlinear regression and optimization method, equations which can be plot as GSI-based slope performance curves were proposed. The proposed equations can be used to estimate the stable angle of rock slope with known material constants (mi), intact rock strength(σci), geological strength index(GSI) and slope height. The ratio of the slope angle and calculated stable angle can be used as the rock avalanche susceptibility-index. Besides, this study estimated the mass movement volume of a rock avalanche according to the results of slope stability analysis. The runout distance of rock avalanche can be estimated using a empirical relation of slid mass volume and runout distance. Base on the statistics analysis, this study proposed equations for estimating the runout distance with known slope angle and slope height. Finally, the influence zone, including upslope and downslope, of rock avalanche has been proposed. The proposed influence zone of rock avalanche are function of slope angle and slope height.
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