兰新高速铁路挡风墙合理高度研究

为保障兰新高速铁路列车运行安全,建立了动车组、线路和挡风墙等的三维模型进行数值仿真计算.经动模型试验和风洞试验验证,结果表明：合理挡风墙高度随路基高度的变化是非线性的,即在路堑上,合理挡风墙高度随路堑深度的增加而减小;在平地和路堤上,最优挡风墙的高度为3.5～4.0 m;合理设置挡风墙后,其最大防御风速随路基高度的增加而减小,路基越高越危险.

A Study of the Reasonable Helght of Windbreaks for the Lanzhou-Xlnjiang High-speed Railway

In order to guarantee the safe running of trains on the Lanzhou-Xinjiang high-speed railway,a 3-D model for EMUs,lines and wind walls is built for simulation calculation.The dynamic model testing and wind tunnel testing show that the variation of the reasonable height of the wind break wall in relation to the roadbed is non-linear: in trenches,the reasonable height of the wind break wall decreases with the increase of the depth of the trench;on flat land and on embankments,the optimal wall height ranges from 3.5 to 4.0 meters.After the reasonable height is determined,the maximum wind speed to be defended against decreases with the increase of the height of the roadbed;the higher the roadbed,the more dangerous it is.