Identifying the influence of a large alluvial valley on train-induced vibration propagation in Rome by an integrated approach

In recent decades, the number of tunnels has increased within city centres worldwide due to the construction of new underground train lines, thus instigating subsequent issues related to an increase in the amount of vibrations affecting pre-existing buildings and infrastructures; therefore, more studies have been devoted to investigating the interactions between underground train lines and buildings within the framework of a site-city interaction (SCI) scheme. The already designed layout of line C of the Rome Metro was chosen as the research object of a case study focusing on underground train-induced vibration propagation in the city centre of Rome (Italy). Numerical modelling was carried out to analyse the propagation of future vibrations within the large buried alluvial valley and to assess the spatial extension of the induced vibration resentment.