عنوان مقاله [English]
Buckling and geometric variation of railway track are the phenomena that threaten railway stability. The lateral resistance is the factor that maintains stability of railway track against them. In ballasted tracks, there are some regions that lateral forces increase, for example, in areas with high differences in temperature or in curves with low radii. In these places, the train speed will be restricted for keeping lateral stability. This approach will decrease the capacity of passengers and freight train transition. A lot of investigations by different researchers were carried out by using beam model or Euler theory Such as Kerr 1999 and Kish et al . Other experimental and field studies have been done by Plasser and Theurer studies, Le pen and some Msc Dissertations in School of Railway engineering (SRE) of Iran University of Science and Technology (IUST). In this school a lot of bachelor and master thesis with this base defined and carried out. In related with numerical study of lateral resistance, there are limited studies like an article with subject “A numerical study of the lateral ballast resistance in railway tracks” presented by Kabo . The technical investigation showed that different parameters affect the lateral resistance such as type and weight of sleeper (winged sleeper, frictional sleeper etc.), ballast density, fouling, extent and material of ballast layer. This paper presents an innovative approach with using concrete asphalt in ballast shoulder that will increase lateral stability of railway. In this approach ballast material in shoulder substitutes with concrete asphalt and performance of shoulder will be evaluated.