2021 Fiscal Year Final Research Report

Evaluation of mechanical characteristics related to the collapse phenomenon of the snow bank formed by snow removal work

Research Project

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Project/Area Number	19K04973
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 25030:Disaster prevention engineering-related
Research Institution	Nagaoka National College of Technology
Principal Investigator	KAWADA YOSHITAKA 長岡工業高等専門学校, 機械工学科, 教授 (50177705)
Co-Investigator(Kenkyū-buntansha)	上村靖司長岡技術科学大学, 工学研究科, 教授 (70224673)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	雪堤 / 崩れ / 力学的強度 / せん断強度 / 雪層境界
Outline of Final Research Achievements	In snowfall areas, in addition to natural snowfall, removed snow is piled up on the sides of the road, forming snow banks. The purpose of this study is to understand the mechanical properties (mainly snow strength) that are likely to be related to the phenomenon of snow bank collapse as a basic research to develop countermeasures to prevent the collapse. Granulated snow was used as a test sample. The main findings were as follows. The strength of a snowpack increases with the passage of days. However, this trend disappears when the snow contains more water. The shear strength at the boundary between two snow layers with different stacking dates does not change with the passage of days when the pressure applied to the boundary is small, but increases with the passage of days when the pressure is large.
Free Research Field	熱工学
Academic Significance and Societal Importance of the Research Achievements	学術的意義については、雪層の崩れ現象に関して雪崩（なだれ）に関する研究が多数行われているが、それらの研究で対象とする雪層は自然に降り積もった雪である。それに対して、本研究で対象としている雪堤の雪は、路上の積雪を除雪機で積み上げたものと自然積雪の複層構造になっているため、自然に降り積もった雪とは構造・性状が異なるとともに、不純物を多く混入している点も異なる。これにより力学的特性も両者で大きく異なると考えられる。社会的意義については、本研究の最終目的は交通事故等の被害を招く雪堤の崩れを防止することであり、今回の成果をさらに発展させればその目的を達成できる。