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*博士（工学） (独) 寒地土木研究所 寒冷沿岸域チーム（〒062-8602 札幌市豊平区平岸 1 条 3 丁目 34 号） ** 博士（工学）八戸工業大学教授，工学部環境建設工学科（〒031-8501 八戸市妙大開 88-1） ** 博士（工学）北海道大学大学院教授，工学研究科社会基盤工学専攻（〒060-8628 札幌市北区北 13 条西 8 丁目） This paper reports on the results of a medium-scale experiment regarding the impact applied by ice floes with a length of 0.15 to 1.2m and with an impact velocity of 0.14 to 5.4m/s against a pile structure and numerical simulation using the 3-D discrete element method (DEM). Ice caused brittle failure/splitting in most cases. In those cases, we found that the increase rate of maximum impact load due to impact velocity decreased in comparison with that in non-fracture cases, and that the length of ice floe in the impact direction did not affect the impact load. We also developed a fundamental numerical method to simulate the impact of ice. The simulation results showed a close correlation with the experimental outcome in terms of the time-series change of impact loads, the dynamic failure processes of the ice floe.

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