Professor Akihiro Fujimoto, an academic researcher at the University of Fukui, and Professor Katsuhisa Kawashima of the Research Institute for Natural Hazards and Reconstruction at Niigata University By investigating the stalling, we clarified the formation of a snow-packed road surface with severe unevenness and the mechanism of generation of vehicles that cannot transmit.
According to Niigata University and others, Associate Professor Fujimoto and his colleagues found in a field survey during heavy snowfall that snow-packed road surfaces were scattered in sections where vehicles were stuck one after another.A vehicle transmission test was conducted at the Katsuyama Snow Removal Base on the Chubu Jukan Expressway in Katsuyama City, Fukui Prefecture, and it was found that the unevenness of the snow-packed road surface produced a vehicle that was stuck.
As a result of investigating the change in the snow pressure condition when the vehicle was stopped on the snow-packed road surface on the prefectural road in Uonuma City, Niigata Prefecture, it became clear that the tires sank into the snow-packed snow when the vehicle was stopped, and it was easy for the vehicle to get stuck.The depth of the tire sinking is about 20 cm in 4 minutes.When the tires slipped when starting, the dents in the compressed snow became extremely deep, making it even easier to get stuck.
The tires of the following vehicle fit into these dents, and by spinning the tires, a vicious cycle that deepens the dents occurs, and the dents increase in a chain reaction, forming a heavily uneven snow-packed road surface.Associate Professor Fujimoto and his colleagues believe that the weight and heat of the tire compresses and melts the compressed snow, causing the tire to settle more in the compressed snow and reducing the frictional force between the tire and the compressed snow, causing the vehicle to get stuck.
