Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Behavior of sand-contaminated ballast reinforced with geogrid under cyclic loading
Highlights Cyclic responses of sand fouled ballast reinforced with geogrid were investigated. Effect of sand content and geogrid properties on ballast settlement was derived. A novel model for prediction of ballast settlement was developed. Method of geogrid reinforcement for the best ballast performance was derived.
Abstract A ballasted railway track is contaminated when passes through sandy areas. Due to sand penetration into the ballast voids, mechanical behavior of tracks deteriorates. Despite the dynamic nature of the load in the railway system, mechanical behavior of ballast reinforced with geogrid and contaminated with sand under cyclic loading have not been investigated. To study the influence of geogrid on improvement of cyclic mechanical properties of contaminated ballast, extensive laboratory tests were performed in this research. To this end, a ballast box machine was used in order to model in-situ cyclic loads. The tests were carried out on ballast samples contaminated with various sand dosages and reinforced with different geogrids. The results indicate that sand materials make ballast aggregates move and slide easier, causing more ballast settlement. It was shown that by geogrid reinforcement, settlement decreases (up to 75%), degradation (breakage) of ballast reduces (up to 23%), and its stiffness increases (up to 50%). An innovative model was developed which takes into account sand content and geogrid reinforcement that provides the settlement of ballast. An effective method of geogrid reinforcement for obtaining the best performance of ballast under cyclic loading was derived.
Behavior of sand-contaminated ballast reinforced with geogrid under cyclic loading
Highlights Cyclic responses of sand fouled ballast reinforced with geogrid were investigated. Effect of sand content and geogrid properties on ballast settlement was derived. A novel model for prediction of ballast settlement was developed. Method of geogrid reinforcement for the best ballast performance was derived.
Abstract A ballasted railway track is contaminated when passes through sandy areas. Due to sand penetration into the ballast voids, mechanical behavior of tracks deteriorates. Despite the dynamic nature of the load in the railway system, mechanical behavior of ballast reinforced with geogrid and contaminated with sand under cyclic loading have not been investigated. To study the influence of geogrid on improvement of cyclic mechanical properties of contaminated ballast, extensive laboratory tests were performed in this research. To this end, a ballast box machine was used in order to model in-situ cyclic loads. The tests were carried out on ballast samples contaminated with various sand dosages and reinforced with different geogrids. The results indicate that sand materials make ballast aggregates move and slide easier, causing more ballast settlement. It was shown that by geogrid reinforcement, settlement decreases (up to 75%), degradation (breakage) of ballast reduces (up to 23%), and its stiffness increases (up to 50%). An innovative model was developed which takes into account sand content and geogrid reinforcement that provides the settlement of ballast. An effective method of geogrid reinforcement for obtaining the best performance of ballast under cyclic loading was derived.
Behavior of sand-contaminated ballast reinforced with geogrid under cyclic loading
Sadeghi, Javad (Autor:in) / Tolou Kian, Ali Reza (Autor:in) / Khanmoradi, Ali (Autor:in) / Chopani, Mohammad (Autor:in)
01.11.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
The lateral displacement response of geogrid-reinforced ballast under cyclic loading
| Online Contents | 2013