Impact force propagation mechanism of rock into sand cushion using 2D-DEM

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  • 二次元個別要素法解析による敷砂緩衝材の衝撃力伝達メカニズム
  • ニジゲン コベツ ヨウソホウ カイセキ ニ ヨル シキズナ カンショウザイ ノ ショウゲキリョク デンタツ メカニズム

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Abstract

Cushioning materials, such as sand cushion and granular mats placed on rock sheds, can effectively disperse and reduce rock fall energy before rocks collide with protection works. To elucidate the cushioning mechanism of cushioning materials, particularly sand cushion, this study examines the manner by which impact force is transmitted in a sand mat in case of different external force and sand cushion thickness. The results obtained are summarized as follows: (1) The maximum transfer impact force increases the duration of rockfall impact force; (2) changes in the ratio of transmitted impact force and rockfall impact force by external force conditions and sand cushion conditions are reflected by stress propagation behavior and the duration time of rockfall impact force.

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