干旱区生态环境知识资源中心

One of the important issues of railway in desert regions is the filling of spaces between the grains from fine particles by windy sands. Windy sands as polluters of ballast layer cause to increase the track stiffness therefore will incur serious damages to sleepers, pads rails and vehicles. In this paper according to change of track stiffness, subject of environmental vibration transfer due to train-induced has been studied. In order to,firstly the field studies of windy sand in Iran have been investigated and then the railway track in two-dimensional plane strain by using software of ABAQUS has been analyzed and track vibrations have been examined by changing the values of ballast layer stiffness. Vibrations caused by axle load at different distances from cross-section of track were analyzed and the amount of vertical vibration displacement, velocity and acceleration has been examined. Results show that with increasing ballast layer stiffness caused by the filling of sand, vertical vibration acceleration levels increased. At the end of the paper,reduction methods of train-induced vibrations have been introduced.