Author(s): Huhtala Timo, Ruohonen Mikael, Kylliäinen Mikko
Due to urbanization and ecological aspects there has been a growing need to plan new residential areas with easy access to the public transportation. In many areas in Finland, new housing is located close to railway or metro lines. Depending on soil conditions there is a risk of having acoustical challenges related to vibration or ground-borne noise.\n\nThere has been a research project funded by the Finnish Transport Agency where a deep stabilization was used to mitigate ground-borne vibrations and to protect new housing area located near the main railway track. Research project and the acoustical engineering related to vibration mitigation structure was carried out by the department of acoustical engineering of AINS Group. Research included field measurements before and after the construction of the mitigation structure and cost analyses with respect to the permitted building area. According to the measurement results in vertical direction, attenuation was estimated to be about 50 % at the distance of 10 meters from the structure. At the distance of 45 meters the attenuation was about 40 %. In horizontal direction, the attenuation of 80 % was measured at both distances. Housing protected by the stabilization structure consisted of about 13 250 square meters and the total cost including constructor work was estimated to be 83 000 € (0 % VAT). From these figures one can notice that in this case, the cost of the mitigation structure is only about 6,30 € per square meter meaning that it is very cost efficient way to reduce train induced vibrations.
Name: Mr Timo Huhtala