engleski

The impact of ballast thickness on vertical track stability

The main elements of the upper structure of the classical rail track constructions are the rails, sleepers and the track screen (the ballast). The connection of the rails and the sleepers is achieved by an appropriate method of fastening. If the rail track ballast is observed, its main purpose is to elastically and equally transfer the loads caused by the rail vehicles to the plane of the lower structure, to secure the direction and height of the rail track and to dampen the vibrations in the rail track. For the ballast to fulfill the said requirements, it must have sufficient dimensions (width and thickness) and must be constructed of a good quality material. This paper considers impact of the thickness of the ballast on the vertical stability of the rail track. The measurements of track displacement were performed on the Croatian Railways network (location: Skrljevo - Meja - Pecine). This section is in a cut with longitudinal slope of 22 ‰ and thickness of the ballast is 15 to 20 cm. During the year 2005 the wooden sleepers were replaced with the concrete sleepers. After two years from the replacement, the new sleepers sunk due to further crushing of the ballast.

concrete sleeper; ballast; vertical track stability; vibrations

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