| Budget Amount *help |
¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
Fiscal Year 2016: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Outline of Final Research Achievements |
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. Although the construction costs for sedimentary layers are low, these layers are attracting attention as construction devices that can substantially improve the margin of safety ratio. To elucidate the mechanism that governs the impact force waveform of falling mass, this study examines the loading rate dependency of sand cushion by DEM simulation. In the simulation, particular attention is paid to the velocity of stress waves that propagate in sand cushion.
For responding to a wider range of falling rocks impact by absorbing system using soils, we carried out falling-weight impact test against alternating layers absorbing systems. Upper and under layers of alternating layers is composed of sand and middle layer is composed of gravel.
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