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Analyse et interprétation de la pression d'eau en fondation des barrages-voûtes à partir des mesures d'auscultation

Abstract : The aperture of the rock-concrete interface of arch dams is a frequently observed phenomenon that shows through the non-linear features it induces in the local piezometry: threshold effects, couplings between its explanatory factors (hydrostatic effects, thermal effects, temporal effects). In order to interpret the corresponding monitoring measurements, it is necessary to take into account the non-additivity of those influences. This is not feasible with the multi-linear regression models that are commonly used in engineering. In that context, the aim of this thesis is to come to a better understanding of the hydraulic phenomena that occur at the rock-concrete interface based on the analysis and interpretation of monitoring measurements. In parallel, the objective is to characterise the state of deterioration of the contact, and more particularly its spatial extent, thanks to those measurements. To that end, two models were developed, the first one based on artificial neural networks, the second one based on a non-linear formulation of HST, enabling to make explicit the effects of the different loads on the flow. The interpretation of the piezometry in terms of reversible and irreversible effects made it possible to propose a geometrical characterisation of the contact state in an upstream-downstream profile, based only on the analysis of those effects. Then, an analytical flow model was expressed and investigated, built on this geometrical description of the contact. It permits to interpret the pressure field in several measuring points in one profile.
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https://tel.archives-ouvertes.fr/tel-02406469
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Submitted on : Thursday, December 12, 2019 - 10:26:06 AM
Last modification on : Wednesday, October 7, 2020 - 1:06:02 PM
Long-term archiving on: : Friday, March 13, 2020 - 6:59:56 PM

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  • HAL Id : tel-02406469, version 1

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Mathilde de Bigault de Granrut. Analyse et interprétation de la pression d'eau en fondation des barrages-voûtes à partir des mesures d'auscultation. Mécanique des solides [physics.class-ph]. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAI048⟩. ⟨tel-02406469⟩

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