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Cartographie des champs vibratoires à la surface des sols en milieu urbain : Application ferroviaire et chantiers

Abstract : The urban vibratory environment is currently undergoing profound transformations. The creation of tram networks in many cities, as well as the proliferation of real estate projects near railway tracks, entail high risks of vibration and acoustic annoyance for residents. Therefore, it becomes essential for acoustic consultants and engineering firms to be able to estimate the vibration level propagated from a source in the ground and in the surrounding constructions. The interaction model presented in this work assumes a structure resting on the ground surface and a contact occuring on relatively small surfaces. It is based on an analytical development starting from the equations of motion for a layered soil. The modeling method for the structure is not specified in order to preserve versatility. The numeric resolution scheme is suitable for carrying out parametric and dimensioning studies. A measurement campaign is carried out nearby a viaduct supporting a metro line. The mechanical characteristics of the ground are estimated using the MASW (Multichannel Analysis of Surface Waves) method, and the vertical vibration velocities on the viaduct deck and at several locations on the ground surface are measured as metro trains pass by. The vibration transfer from the deck to the ground is adequately reproduced by the interaction model. The uncertain parameters of the problem, such as the thickness of the deck or the resonance frequency of the uncoupling elements placed under the deck, are studied separately in order to best match the simulation to the measurement. The limits of the model are also highlighted, in particular near the piles of the viaduct. The ground vibration model is then extended to the time domain. A comparison with a measurement of the ground excited by an impact hammer produces satisfactory results. This opens up different application perspectives relating to risk assessment of structural damage and perturbation of sensitive equipment.
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Submitted on : Friday, September 9, 2022 - 10:16:12 AM
Last modification on : Saturday, September 10, 2022 - 3:39:01 AM

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  • HAL Id : tel-03773332, version 1

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Ghislain Duval. Cartographie des champs vibratoires à la surface des sols en milieu urbain : Application ferroviaire et chantiers. Acoustique [physics.class-ph]. Université de Lyon, 2022. Français. ⟨NNT : 2022LYSEI043⟩. ⟨tel-03773332⟩

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