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Congélation artificielle des terrains : de la modélisation à l’application

Abstract : Artificial ground freezing has been used for decades as a temporary ground stabilization and waterproofing technique to solve civil or mining engineering problems at low cost. However, the water-ice phase change can induce ground movements at the surface or in adjacent nonfrozen areas. The magnitude of these movements depends, among other things, on the geological and hydrogeological conditions. Thus, to assess the risks associated with the use of artificial ground freezing, a coupled Thermo-Hydro-Mechanical-Chemical (THMC) model, allowing to predict the extent of the frozen zone and the stability of the ground, is presented. This model is based on a macroscopic continuum approach and uses simplifying assumptions to overcome the computational difficulties associated with the modeling of complex mining environments over a long period of time. The model is applied to the case of the Cigar Lake mine (Canada). Fully coupled THM simulations of the ground freezing and excavation activities taking place in the mine allowed to accurately predict the freezing evolution around the deposit and the settlements observed around a production tunnel excavated below the frozen ground.
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Contributor : AHMED ROUABHI Connect in order to contact the contributor
Submitted on : Saturday, September 10, 2022 - 3:09:58 PM
Last modification on : Monday, September 12, 2022 - 3:02:29 AM



Hafssa Tounsi, Ahmed Rouabhi. Congélation artificielle des terrains : de la modélisation à l’application. Revue française de Géotechnique, edp sciences, 2022, pp.2. ⟨10.1051/geotech/2022008⟩. ⟨hal-03774401⟩



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