Simulation Research On Preventive Measures Of Wind-blown Snow Disaster On Keta Railway

The phenomenon of wind and snow blowing occurs frequently in Xinjiang,Jilin and other regions in China,which will have a significant impact on the safety of traffic lines and residents’ lives,and cause huge economic losses to the local people.With the gradual improvement of Xinjiang’s railway network,it is of great practical significance to study the formation mechanism of wind and snow and railway prevention measures,and optimize the parameters of snow prevention measures to make it play the best snow prevention effect and ensure the safe operation of railways.Taking the Keta Railway as the research object,based on the wind and precipitation data of the Xinjiang Uygur Autonomous Region over the years,the basic wind speed during the 50-year return period was calculated,and the areas with severe wind and snow disasters were obtained;then use Fluent numerical simulation software to study the anti-wind and snow flow effects of different protective measures under the 50-year return period wind speed,which provides a theoretical basis for the construction of railway subgrades in Xinjiang and the setting of anti-wind and snow measures.The main achievements of this thesis are as follows:(1)According to the route of the Keta Railway and the characteristics of wind and snow along the line,the wind speed,direction and precipitation data of the past49 years are analyzed,and the range of the roadbed section prone to wind and snow disasters on the Keta Railway and the cause mechanism of the wind and snow disasters are obtained.And calculated the basic wind speed during the 50-year return period in the area(2)Using Fluent software,a numerical model of the subgrade section,snow fence and wind deflector under a certain proportion was established.Study the impact of different embankments,different snow fence parameters,and different wind deflector parameters on wind and snow disasters under the 50-year return period wind speed;Change the height of the embankment and the side slope to obtain the changes and laws of the wind speed field near the embankment in various forms;Change the air permeability and layout spacing of the snow fence,and analyze the effect of different snow fence parameters;Change the angle and height of the wind deflector,comprehensively analyze the wind speed changes on the roadbed surface,and determine the optimal characteristic parameters of the prevention and control measures(3)Under the 50-year return period wind speed,the actual size embankment model and the embankment model under certain snow protection measures are numerically simulated,and Analyze the snow cover area of the embankment and the setting of snow protection measures,and get the snow cover and control effect under the actual size model.(4)Analyzing the simulation results,summarizing the two aspects of active prevention and passive prevention,and according to the distribution of snow and the prevention effect of snow prevention measures,reasonable prevention and control suggestions for the wind and snow disasters of the Keta Railway are put forward.The spatial distribution,influencing factors and technical countermeasures of the wind and snow disasters of the Keta Railway have been studied,which has important theoretical reference and technical support for the prevention and control of the railway wind and snow disasters.