The Research On Wind Field And Wind Blowing Snow Around Road And Bridge Transition Section

The research content of this paper mainly relies on the transportation science and technology project of Shandong Province-"Research on the impact of expressway construction on the evolution of regional ecological environment field and regulation technology".In recent years,China has caused serious traffic accidents due to wind and snow flow disasters.How to ensure driving safety in windy and snowy weather is an important research direction.Planting windbreak forest can not only protect the area from storing snow in snowy weather,but also solve the problem of vehicle overturning safety.It is of great significance to ensure driving safety.In this paper,numerical simulation is used to study the wind field and snow cover in the transition section of road and bridge.The main research contents and conclusions of this paper are as follows:(1)Based on the existing wind field research,the standard k-ε turbulence model method is used to simulate the regional wind field by integrating the height of tree and the change of air permeability throughout the year.It is found that the wind shielding effect is obvious and the influence of tree height is significant under the air permeability of trees in spring and summer;the wind shielding effect is unobvious in the wind field under the air permeability of trees in autumn and winter,and the influence of tree height is very small.(2)The two-phase flow model is verified.The two-dimensional simulation of wind blowing snow on the playground is carried out and the simulation results are compared with the simulation results of references,the consistent snow particle distribution law is obtained.Therefore,it is determined that the model to be used in this paper is EulerianEulerian two fluid model.(3)The Eulerian-Eulerian two-phase flow model is used to discuss the snow cover in the transition section of road and bridge under different working conditions.It is found that the snow cover distribution in the transition section of road and bridge is less under the wind speed of 10m/s,the tree height of 10 m,the tree arrangement distance of 7m,the air permeability of 65% and 30 ° wind angle.(4)Using the snow coefficient defined by the mechanics principle of the interaction between wind and snow to discuss the snow cover law,and it is compared with the conclusion of wind snow two-phase flow simulation.It is found that under the same working conditions,the distribution and variation of snow cover obtained by the two analysis methods are similar.