Evaluation of railway track geometry stabilisation effect of geogrid layers under ballast on the basis of laboratory multi-level shear box tests

Abstract

In this article authors investigated the railway track geometry stabilisation effect of geogrid layers under ballast with a specific laboratory multi-level shear box. During the laboratory tests four different types of geogrid layer (in two cases combined with geotextiles) were analysed when railway ballast was uncompacted and compacted. Two types from these (geogrid type 2 and geocomposite type 2) have not utilised for railway track geometry stabilisation yet. The authors determined inner shear resistance of railway ballast in case of without and with geogrid reinforcement, as well as five multiplication factors were defined which are adequate for determining inner shear resistance of reinforced and unreinforced railway ballast in consideration of different parameters.