Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The `Bow-Wave' Effect in Soft Subgrade Beneath High Speed Rail Lines
This paper discusses the critical speed (the `bow-wave' effect) and how it is influenced by soil stiffness. In order to reach the centers of major conurbation, modern high- speed rail lines are increasingly utilizing marginal land avoiding previously built housing areas. This land often has low soil stiffness. The critical speed of waves across such soils can approach the speed of modern high-speed trains. The large deflections caused can increase environmental noise and the track maintenance required and decrease ride quality. This paper discusses how the effect of train speeds can be predicted using computer modeling and an instrumented impact device. The modeling of possible remedies to the problem are discussed. A convolution teclmique is used to model axles travelling at different speeds and the effects of multiple axles. The resulting displacements are highly dependent on the amount of damping introduced into the system modeled. In-situ testing, laboratory testing and finite element modeling are compared and are shown to provide consistent results. The conclusion is that a powerful analytical tool for the prediction of the `bow-wave' effect has been devised.
The `Bow-Wave' Effect in Soft Subgrade Beneath High Speed Rail Lines
This paper discusses the critical speed (the `bow-wave' effect) and how it is influenced by soil stiffness. In order to reach the centers of major conurbation, modern high- speed rail lines are increasingly utilizing marginal land avoiding previously built housing areas. This land often has low soil stiffness. The critical speed of waves across such soils can approach the speed of modern high-speed trains. The large deflections caused can increase environmental noise and the track maintenance required and decrease ride quality. This paper discusses how the effect of train speeds can be predicted using computer modeling and an instrumented impact device. The modeling of possible remedies to the problem are discussed. A convolution teclmique is used to model axles travelling at different speeds and the effects of multiple axles. The resulting displacements are highly dependent on the amount of damping introduced into the system modeled. In-situ testing, laboratory testing and finite element modeling are compared and are shown to provide consistent results. The conclusion is that a powerful analytical tool for the prediction of the `bow-wave' effect has been devised.
The `Bow-Wave' Effect in Soft Subgrade Beneath High Speed Rail Lines
Heelis, Michael E. (Autor:in) / Collop, Andrew C. (Autor:in) / Dawson, Andrew R. (Autor:in) / Chapman, David N. (Autor:in) / Krylov, Victor V. (Autor:in)
Specialty Conference on Performance Confirmation of Constructed Geotechnical Facilities ; 2000 ; Amherst, Massachusetts, United States
03.04.2000
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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