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Induced vibrations due to high-speed trains: Córdoba-Málaga high speed line
| Content Provider | Semantic Scholar |
|---|---|
| Author | Galvín, Pedro Abascal, José Domínguez |
| Copyright Year | 2007 |
| Abstract | Numerical models to obtain ground vibrations induced by the passage of HST, based on finite element method and boundary element method, have been developed in the last years. A few models have been validated, comparing the results obtained from numerical models and those obtained from experimental measurements. Most of these models contain important simplifications, i.e; the ground geometry around the track is not considered or close structures can not be taken into account. Other models only produce the vertical displacements of the ground. In this paper, a three-dimensional BEM-FEM model based on time domain formulation to solve wave propagation problems is presented. The soil is assumed to be a uniform half-space with viscoelastic properties, and the structures can be represented by FE or BE. From the proposed numerical model, vibrations induced by the passage of HST have been obtained. The geometry and the properties of the ballast have been also considered. The numerical results obtained from the proposed model have been compared with in situ measurements performed during the passage of AVE high speed trains on the track between Córdoba-Málaga. The agreement between both sets of results is quite good. INTRODUCTION High speed trains are becoming a usual mean of transportation for intermediate distances in many countries. New lines have been constructed in recent years. Factors such as: vibrations in the train, wave propagation in soil next to the track and dynamic effects in nearby constructions, are much more important in high speed trains than in conventional ones. These effects require a deep analysis in order to maintain security and comfort in the trains and to avoid problems in nearby constructions due to vibrations induced by waves transmitted through the soil. Particularly serious would be situations in which the train speed may be higher than that of the surface waves in the underneath soil. This possibility was completely unthinkable in conventional trains but it is now something that should be taken into account when high speed trains operate at locations with particularly soft soils or underground discontinuities that may result in relatively low surface wave speed. The study of these problems require of comprehensive models that take into account many factors related to the characteristics of the train, the track, and the particular soil properties. Nearby structures should also be modelled in case the effects on these structures are being analyzed. Different analytical, semi-analytical or numerical methods have been developed in recent years. Numerical methods are intended to reproduce more precisely the particular conditions of the problem taking into account the important dynamic interaction effects. Finite Element Method (FEM) and Boundary Element Method (BEM) have been used for the study the problem of high speed train passing taking into account propagation of waves in the soil and dynamic soil-structure interaction [1,2]. The main differences between these models are based on the way in which excitation and interaction effects are considered. It is known that Boundary Elements are very well suited for dynamic soil-structure interaction problems. They are able to represent unbounded regions in a natural way due to the fact that the fundamental solution and, therefore the solution of the problem at hand, satisfy the radiation conditions. In the case that a full space fundamental solution is used for soil problems, the whole soil surface extending to infinity should be represented. Nevertheless, the discretization can be truncated at a short distance from the zone of interest without lost of accuracy [1]. These |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://idus.us.es/xmlui/bitstream/handle/11441/52695/Ponencia_Galvin_2007_ica2007_induced.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
