Method for estimating railroad track settlements due to dynamic traffic loads
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Data
2005-12-01
Autores
Queiroz, Rudney C. [UNESP]
Macari, Emir José
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Resumo
This paper is the result of real-scale physical modeling study designed to simulate the load-deformation characteristics of railroad foundation systems that include the railroad ties, the ballast, and the sub-base layers of a railroad embankment. The study presents comparisons of the application of dynamic loads of 100kN on the rails, and the resulting deformations during a 500,000 cycle testing period for three rail support systems; wood, concrete and steel. The results show that the deformation curve has an exponential shape, with the larger portion of the deformation occurring during the first 50,000 load cycles followed by a tendency to stabilize between 100,000 to 500,000 cycles. These results indicate that the critical phase of deformations of a new railroad is within the first 50,000 cycles of loading, and after that, it slowly attenuates as it approaches a stable value. The paper also presents empirically derived formulations for the estimation of the deformations of the rail supports as a result of rail traffic.
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Cycle testing, Deformation curves, Dynamic traffic, Foundation systems, Load cycle, Load deformation, Physical modeling, Rail traffic, Sub-bases, Support systems, Track settlement, Concrete testing, Dynamic loads, Geotechnical engineering, Loading, Models, Railroads, Soil mechanics, Steel testing, Deformation
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Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment, v. 3, p. 1769-1772.