Abstract
The vibrations induced by railway are a major problem in Western Finland’s soft soil areas, where the residential areas are located near railway. FTIA started to investigate the problem and together with VR-Transpoint, they organized extensive test drives in the Kokemäki-Pori railway. The rolling stock was brought to test drives from Russia. The test drives were monitored and the measured data is used in this study for the 2D modelling of the vibration phenomena. The main goal of this study was to investigate the resulting vibrations at various train speeds at particular site in 2D FE model. The study focuses on the frequency of the input load and the output vibration. The track-embankment-ground system has a frequency response to the input load, which can be assumed to be the natural frequency of the subsoil. The natural frequencies can be calculated with response analyses. With good assumption of the natural frequencies of the ground, the model can be used to discover which frequencies of the input load causes harmful vibration in the railroad environment. The train speed affects to the frequencies of the input load. The model can also be used to find the certain speed of a certain rolling stock, which will cause the certain frequency that will propagate and cause harmful vibrations in a certain soft soil areas.
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