Geogrid reinforcement of ballasted railway superstructure for stabilization of the railway track geometry

Geogrid reinforcement of ballasted railway superstructure for stabilization of the railway track geometry – A case study

Fischer, Szabolcs

Abstract

Abstract Background This article deals with a unique topic related to railway infrastructure, civil and geotechnical engineering, and modern materials. In the past 20–30 years, more and more synthetic materials have been applied in engineering and everyday life. Geogrid and geotextile products are adequate for substituting lacking abilities of the soils, and granular materials, mainly low tensile and shear strength, etc. This paper aims to introduce the result of the author's research dealing with investigating the behavior of geogrid-reinforced railway ballast based on a long-term field test in the busiest main railway line in Hungary. The duration of the test is more than eleven years. Methods Five different types of geosynthetics were installed in the superstructure of the No. 1 main railway line (Kelenföld – Hegyeshalom state border) in Hungary in 2010. More than eleven years have elapsed since the installation. The experiences are formulated in this paper. Mathematical-statistical analysis was performed to compare the (sub)sections with each other and with the designated reference sections where no geogrids were applied. Results As a result of the examination, the author summarized the main differences in the behavior of railway track geometry, and the geometrical deterioration rates, considering the different types of reinforcement products.

Highlights • Five geogrid types were examined in same railway circumstances. • More than 11-year geometrical deterioration process was analyzed. • Water pockets and drainage problems were also considered. • Mathematical statistical methods were applied to compare the geogrids. • The paper focused on engineering design and maintenance aspects.