Abstract
This paper evaluates the most suitable thickness of both asphalt and ballast layers to improve the conventional high-speed ballasted tracks. The work was conducted by designing asphalt mixture using the Marshal method in the laboratory and using the ANSYS software to evaluate the best thickness of both theballast and asphalt layer to minimize vertical deformations and corresponding stresses. The results of the numerical analysis showed that the minimum deformations and stresses for a track containing a bituminous sub-ballast system are lower than the deformations and stresses for a conventional system when the thickness of the ballast layer was 250 mm. However, when the thickness of the ballast layer was 300 mm, the vertical deformation increased when the asphalt layer thickness increased. This theoretical analysis proved that a track that consists of 250 mm ballast and 120 mm bituminous sub-ballast layers enhances the structural behavior of the high-speed ballasted tracks.
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