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Modélisation THMC de la congélation artificielle des terrains : Application à la mine de Cigar Lake

Abstract : Artifical ground freezing (AGF) has been used for decades as a temporary soil stabilisation and waterproofing technique inorder to solve civil or mining engineering problems at lower costs. A successful implementation of this technique requires the use of numerical tools to predict the freezing evolution and the site stability. Through a thermodynamically consistent framework, a fully coupled thermo-hydro-mechanical formalism, considering the salinity effect and capturing the most relevant phenomena of ground freezing, is derived. The formalism includes an elasto-viscoplastic constitutive model, able to correctly reproduce the mechanical behavior of frozen soil, and fitted against temperature and strain rate-controlled triaxial tests carried out using a newly-developed experimental facility. The proposed approach is validated by meansof freezing laboratory tests, carried out on specimens initially fully saturated with pure water or with sodium chloride solutions at various concentrations. At the field scale, the formalism is applied to the case of the Cigar Lake mine. Fully coupled thermo-hydro-mechanical simulations of the ground freezing and excavation activities taking place in the mine are performed, in order to predict the freezing evolution in the ground and its influence on the ground movements in the vicinity of production tunnels excavated below the frozen ground.
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Submitted on : Thursday, February 27, 2020 - 3:37:22 PM
Last modification on : Wednesday, October 14, 2020 - 3:52:18 AM

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2019PSLEM053_archivage.pdf
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  • HAL Id : tel-02493110, version 1

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Hafssa Tounsi. Modélisation THMC de la congélation artificielle des terrains : Application à la mine de Cigar Lake. Géologie appliquée. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEM053⟩. ⟨tel-02493110⟩

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