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Monday, July 8 • 11:00 - 11:20
[NO-SHOW] GROUND BORNE NOISE AND VIBRATION TRANSFER FUNCTION INSIDE SENSITIVE NEO-CLASSIC BUILDINGS FROM PIRAEUS METRO TUNNEL DURING TBM\'S OPERATION

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Attiko Metro S.A., in view of the further development of the Athens Metro network, has fully initiated the new extension of 7.6 km, for line 3 "Haidari to Piraeus Dimotiko Theatre" towards "University of Piraeus" (forestation), connecting the major Piraeus Port with "Eleftherios Venizelos" International Airport. During the operation of this major urban subway rail transit system, vibrations are expected to be generated when transmitted through the soil and cause vibrations in nearby buildings. In urban areas, these vibrations are a consequence of the vehicle forces acting from the wheels onto the track in local defects. The transmission of ground-borne vibrations from a subway urban rail transit systems inside adjacent buildings is mainly governed by the transfer function (TF) of vibration diffusion from the tunnel wall or invert towards the soil surface in the façade and the interior of two sensitive neo classic buildings of great aesthetic and historical value e.g. the Municipal theatre of Piraeus and the building. During the construction of the extension of Athens Metro to Piraeus in both areas a methodology was proposed using as source of vibration : (a) the TBM operation (considered as linear source), and (b) a point source based on an impact force at the tunnel invert. Both set ups were tested in the above sites in order to determine the necessary TF of the rail vibration diffusion inside the given geological media demonstrating the vibration attenuation values in 1/3 octave band analysis. The proposed metrological approach aims to ensure a high accurate estimation of the expected vibration and ground borne noise levels in each receptor, during operation, and assess possible negative effects on local communities from the metropolitan railway–induced ground vibrations.

Moderators
avatar for Wim van Keulen

Wim van Keulen

owner, VANKEULEN advies
expert in low-noise pavements: - psycho-acoustical labelling,- contracts,- courses,- product development,- questionnaires,- measurements.

Authors

Monday July 8, 2019 11:00 - 11:20 EDT
Outremont 5
  T15 Road & rlway noise & vibr., RS01 Railway noise & vibr