Abstract
Nowadays, the rising demand for new railway networks in Brussels is associated to discomfort and disturbance felt by the neighbourhood. This problem is a major concern of inhabitant surrounding rail infrastructure and causes part of the delay in the Brussels RER network construction. The present paper focuses on the vibratory nuisances generated by domestic trains in Brussels region. A compound experimental/numerical analysis is presented, based on recent investigations on line L161 between Brussels and Luxembourg. A specific site was chosen due to the presence of a singular rail surface defect which induces large ground vibrations when trains pass over. The effect of this defect is examined by means of free field ground vibrations measured during the passing of an AM96 unit, and completed by numerical results obtained from a numerical model. For this assessment, a fully 3D numerical prediction model is built, based on a two-step approach which combines multibody analysis of the vehicle and finite element analysis of the track and surrounding ground. Calculated high ground vibrations stem from singular rail surface defects. The prediction model is validated first and then used to quantify the gain brought by fixing of rail surfaces, with a reduction of local defects.
Highlights
Problems of railway-induced ground vibrations received considerable attention these last years
Speaking, the mastering of ground vibration sources and their effects on neighbour structures is not sufficiently known due to the difficulty to model all the components that intervene in the generation and the propagation of ground waves [1]
The present paper aims to be complementary to this aforementioned research by analysing the effect of rail surface conditions on the ground vibrations
Summary
Problems of railway-induced ground vibrations received considerable attention these last years. Due to the development of new networks, complains are more and more important to such an extent to hinder the prosperity of new solution to traffic congestion Among these complaints, vibrations take an important place since they generate annoyance for humans and possible damage to buildings. Kouroussis et al [8] have analysed the vehicle contribution in the case of an important local defect: without introducing countermeasures in the track or in the soil, it is possible to reduce the energy transmitted from the track to the ground (up to 70%) by modifying the mechanical characteristics of the train. Emphasis is put on the specificities of the studied site: a singular rail surface defect and local embankment conditions In addition to these conditions, the horizontal vibrations and vehicle speed are discussed
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