落体質量と衝突速度の異なる外力条件を受ける敷砂緩衝材の衝撃力伝達挙動に関する数値解析的検討

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  • Numerical study for impact force propagation behavior of rock fall into sand cushion with different masses and velocities
  • ラクタイ シツリョウ ト ショウトツ ソクド ノ コトナル ガイリョク ジョウケン オ ウケル シキズナ カンショウザイ ノ ショウゲキリョク デンタツ キョドウ ニ カンスル スウチ カイセキテキ ケントウ

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Cushioning materials, such as sand cushion placed on rock sheds, have attracted attention as construction devices that can effectively disperse and reduce rock fall energy before rocks collide with rock fall protection structures. To support performance-based designs for rock fall countermeasures, the present study estimated rock fall behaviors and impact forces using 2D discrete element method (2D-DEM). The propagation of impact forces in sand cushion with different masses and velocities of rock fall were investigated. It was discussed that comparison between effects of mass effect and impact velocity on the impact behaviors, the mechanism of impact forces in sand cushion. Even under the equivalent impact energy, the maximum impact forces increase with incresing mass.

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