The metro line in Naples, opened in sections starting from 1992, is characterized by four different infrastructure types: ballasted track on viaducts, double tracked tunnel (cut and cover) with indirect rail fastening to the concrete slab, single tracked deep tunnel with indirect rail fastening to the concrete slab and single tracked deep tunnel with floating slab (mass-spring system). Some complaints, relative to vibrations annoyance, were presented from the inhabitants of the buildings over the line, especially in the portion were the cut and cover tunnel is present. In a test campaign in collaboration with the University of Florence, the vibration levels in various sites along the line were monitored on the infrastructure (track and tunnel). The difference in vibration levels between the three tunnel infrastructures was investigated along with the influence of the rail corrugation. The influence of track formation and maintenance practices are discussed, together with some proposal for vibration annoyance control.
Groundborne vibrations from underground metros: the experience in Metronapoli / A.Bracciali; F.Piccioli; V.Orazzo. - ELETTRONICO. - (2007), pp. 1-9. (Intervento presentato al convegno Railway Engineering 2007 tenutosi a London, UK).
Groundborne vibrations from underground metros: the experience in Metronapoli
BRACCIALI, ANDREA
;PICCIOLI, FABIO;
2007
Abstract
The metro line in Naples, opened in sections starting from 1992, is characterized by four different infrastructure types: ballasted track on viaducts, double tracked tunnel (cut and cover) with indirect rail fastening to the concrete slab, single tracked deep tunnel with indirect rail fastening to the concrete slab and single tracked deep tunnel with floating slab (mass-spring system). Some complaints, relative to vibrations annoyance, were presented from the inhabitants of the buildings over the line, especially in the portion were the cut and cover tunnel is present. In a test campaign in collaboration with the University of Florence, the vibration levels in various sites along the line were monitored on the infrastructure (track and tunnel). The difference in vibration levels between the three tunnel infrastructures was investigated along with the influence of the rail corrugation. The influence of track formation and maintenance practices are discussed, together with some proposal for vibration annoyance control.
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