REPRODUCTION ANALYSIS OF ACTUAL SLOPE COLLAPSE AND PARAMETRIC STUDY FOR EVACUATION OF THE DEPOSIT VOLUME BY A SIMPLE MODEL OF DISTINCT ELEMENT METHOD

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  • 個別要素法簡易モデルによる地震起因斜面崩落土の堆積範囲評価法の提案

Abstract

 In safety estimation of nuclear facilities, it is required to estimate the risk of earthquakes even stronger than assumed in design. The authors have proposed a simple model by the distinct element method to evaluate the traveling distances of the collapsed rock mass when slope collapse happened. There, reproduction simulation was carried out for a 0.8m height collapsed slope and results of the accumulation distribution of the traveling distances of rock mass were comparable or conservative.<br> However, for the restoration plan of access routes assumed to be occluded by the collapsed sediment the estimation of collapsed sediment volume is necessary, since only the conservative estimation for the collapsed distances of sediment is not enough. In this study, reproduction simulation is carried out for the ground of Nakadori area of Fukushima Prefecture, damaged by the 2011 Tohoku-Pacific Ocean Earthquake. Based on the proposed simple model its reproducibility is shown and friction effect to both collapsed distance of sediment and volume of deposit is discussed.

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