| 研究実績の概要 |
This research investigated the mechanism of spontaneous corrugation on the snowy and icy roads which are instructive for prevention technology and road management to promote the safety of traffic and pedestrian. Through this research, various data and inspired conclusions have been obtained, and 2 oral presentations on the international conference (1 invited speech) have been given. The PI moved to a university in the cold region of China and will continue this research.
For experiments, a self-designed device was used to clarify the deformation and movement of sand and snow on road stimulated by a moving oscillator. The property of material, air temperature, moving speed, and touching pressure of the oscillator, are used to simulate the weather and traffic conditions. This helps us to propose reasonable traffic management suggestions. For field survey, we aimed to measure the size and distribution of spontaneous corrugation, but due to the abnormal weather and COVID-19, although we went to the field 10 times, no ideal corrugation had been reported. The journal paper will be completed after the size and distribution data are obtained.
For theoretical research, we have established mathematical models to explain the corrugation and developed 7 numerical models based on different assumptions of compressibility and mobility. Compared to indoor experiments, 2 numerical models perform well. These 2 models help us to identify the influence of touching pressure, natural frequency, compressibility, and mobility on the forming and developing progress of spontaneous corrugation.
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