Study On Formation Mechanism And Prevention Technology Of Wind And Snow Disaster On Afuzhun Railway

Wind-blown snow disasters are often prone to occur in areas with strong wind and snow in northwestern and northeastern China.Wind-blown snow disasters often lead to snow accumulation on the line,affecting traffic safety and safety,and posing great security risks.According to incomplete statistics,because wind and snow disasters have caused traffic disruptions in dozens of railway lines in China and even buried trains,it has greatly affected people's production and life safety.With the improvement of the railway network in the border areas,it is more and more important to study the formation mechanism and prevention measures of the railway wind and snow disaster.Based on the purpose of providing scientific basis for the prevention and reduction of wind and snow disasters,this paper relies on the newly built Afu quasi-road Afu section,set up a typical test section for snow and snow monitoring on the spot,and studied the wind and snow flow of different types of roadbeds and different snow fences.The effect,through the indoor wind tunnel test and numerical simulation calculation,carried out an in-depth analysis of the disaster prevention and mitigation of railway wind and snow disasters.The main work carried out in this paper is:(1)According to the line trend of Afu Railway and the characteristics of wind and snow along the line,wind and snow monitoring equipment is installed in the whole line and key monitoring areas,and the wind speed and snow depth monitoring data of two complete snow seasons in 2017-2019 have been obtained.The wind station and wind speed characteristics in the project area are compared with the weather station data of many years along the line.The characteristics of the wind-blown snow disaster-prone road base and the cause mechanism of the wind-blown snow disaster are analyzed.The properties of the snow particle are tested on site,which is the model parameter of the simulation test.Provide guidance with the determination of particle parameters.(2)Based on the Fluent program,a numerical model is established based on the section of the physical engineering subgrade and the size of the fence.The degree of influence of different types of embankments and roads on wind-blown snow disasters is studied,and the height of the embankment section is changed.The depth of the section and the snow platform are The value of width and other values can be used to obtain the variation law of wind speed field in various forms of roadbed and snow protection project.By changing the porosity of the fence,the spacing of the arrangement and the number of rows arranged,the parameters affecting the distribution of snow deposition and their effects were analyzed,and the protective benefits of different working conditions were compared and analyzed.(3)Establishing a model of railway lines and various prevention measures.Through the wind tunnel test,the effects of different forms of snow fences on the embankment and the wind field and the distribution of snow cover are studied under different wind speed conditions.The snow protection effect of different measures was tested by changing the porosity of the snow fence and the number of rows.The results were compared with the numerical simulation to determine the optimal characteristic parameters of each protective measure.(4)Comprehensive field investigation,instrument monitoring,numerical simulation and wind tunnel test data results,summarizing wind and snow disaster prevention and control measures from active prevention and passive prevention,according to different forms of snow distribution of embankment and road wind and snow field,Targeted prevention and control recommendations from wind and snow disasters in the study area.