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  Structural borne noise and number of neighbours affected during TBM excavation of the Follo Line Project

  The main part of the tunnel in the Follo Line Project is constructed by means of tunnel boring machines (TBMs). Available noise modelling and measurements from various TBM tunnelling projects show a large scatter of results depending on geological conditions, TBM design and actual TBM boring diameter. Not much reference data from TBM excavation with similar boundary conditions is available, and the number of neighbours that will be affected by the tunnel boring is uncertain. Hence the Follo Line Project did a calculation based on available data, but also commenced measuring noise and vibrations in a recreational area to calibrate the calculation model prior to the TBMs reaching residential areas. The paper presents the measurements and the use of the data and finally how this will be managed towards the neighbours.

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