Research on the Formation of Wind-Blown Snow Disaster in Road Cuttingsand Their Prevention
Wind-blown snow disaster is a common natural hazard in cold mountainous areas,and field surveys find that road cutting is one of the roadbed types most vulnerable to wind-blow snow disaster.This study is focused on the formation and prevention of wind-blown snow disasters in road cuttings.The Euler-Euler method and Mixture model are used to simulate the two-phase flow of wind and snow,and the simulation results are validated using field measurements.The evolution process of wind and snow distribution in typical road cuttings affected by wind-blown snow disasters is investigated,and a comparative analysis of the disaster characteristics in different forms of road cuttings is conducted.The results show that wind-blown snow disasters are most severe in road cuttings where the slope ratio on both sides is smaller than 1∶2.The formation of severe wind and snow disasters in such road cuttings is attributed to the increased snow accumulation on both side slopes,which compresses the scale of the vortex on the road surface and weakens the backflow acceleration effect of the vortex.It is also observed that the snow cornice represents a safety reserve period until it reaches the midpoint of the windward slope,at which point the snow accumulation on the windward slope reaches the critical storage level.
万方数据
维普
