Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Non-linear critical speed in high-speed ballasted railways with ground reinforcement
Financiado para publicación en acceso aberto: Universidade da Coruña/CISUG ; [Abstract:] When constructing or upgrading high-speed railway lines on soft soils, reinforcing the soil foundation becomes crucial. This not only involves small track displacements but also increases the critical speed, thereby ensuring safe and efficient regular operations. Nevertheless, existing studies on the critical speed phenomenon in high-speed railway tracks with ground reinforcement are limited, and they all assume a linear elastic behavior for both the soils and reinforcement materials. The main novelty of this research is that it presents the first study on the effect of non-linear soil behavior on the critical speed of high-speed railway ballasted tracks with soil reinforcement and introduces a novel simplified approach based on an equivalent homogeneous soil layer by replacing the soil layer containing inclusions/columns. To accomplish this, a full 3D non-linear numerical model was developed and experimentally validated. The findings from a detailed and comprehensive parametric analysis demonstrate a significant influence of non-linear behavior on the critical speed, resulting in reductions of up to 30% compared to the linear elastic scenario. Furthermore, it is found that the soil-reinforcement stiffness contrast, the area replacement ratio, and the plasticity index of the soil foundation play a crucial role in the critical speed. Other aspects such as the installation pattern and the thickness of soft soil have a relatively lower impact on the critical speed.
Non-linear critical speed in high-speed ballasted railways with ground reinforcement
Financiado para publicación en acceso aberto: Universidade da Coruña/CISUG ; [Abstract:] When constructing or upgrading high-speed railway lines on soft soils, reinforcing the soil foundation becomes crucial. This not only involves small track displacements but also increases the critical speed, thereby ensuring safe and efficient regular operations. Nevertheless, existing studies on the critical speed phenomenon in high-speed railway tracks with ground reinforcement are limited, and they all assume a linear elastic behavior for both the soils and reinforcement materials. The main novelty of this research is that it presents the first study on the effect of non-linear soil behavior on the critical speed of high-speed railway ballasted tracks with soil reinforcement and introduces a novel simplified approach based on an equivalent homogeneous soil layer by replacing the soil layer containing inclusions/columns. To accomplish this, a full 3D non-linear numerical model was developed and experimentally validated. The findings from a detailed and comprehensive parametric analysis demonstrate a significant influence of non-linear behavior on the critical speed, resulting in reductions of up to 30% compared to the linear elastic scenario. Furthermore, it is found that the soil-reinforcement stiffness contrast, the area replacement ratio, and the plasticity index of the soil foundation play a crucial role in the critical speed. Other aspects such as the installation pattern and the thickness of soft soil have a relatively lower impact on the critical speed.
Non-linear critical speed in high-speed ballasted railways with ground reinforcement
Fernández Ruiz, Jesús (Autor:in) / Pereira, Cláudio (Autor:in)
01.01.2024
doi:10.1016/j.trgeo.2024.101325
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC:
624
Non-linear critical speed in high-speed ballasted railways with ground reinforcement
| Elsevier | 2024
Geogrid stabilization in ballasted trackbed for high-speed railways
| Elsevier | 2024
Stiffness Optimization for Ballasted-Ballastless Track Transition Zones in High-Speed Railways
| Springer Verlag | 2024
Spatial Variation of Ground Vibrations in Ballasted High-Speed Railway Embankments
| Springer Verlag | 2020