Sellado de galerías profundas en roca arcillosa. Modelación de un ensayo a gran escala
[ANGLÈS] The NSC essay is one of the activities that the ANDRA – the french agency for nuclear waste management – is carrying out at the underground laboratory of Bure. The aim of this technological center is to provide accurate data about the Callivo-Oxfordian clay behaviour, preparing the site for...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | español |
| OAI Identifier: | oai:upcommons.upc.edu:2099.1/18860 |
| Acceso en línea: | https://hdl.handle.net/2099.1/18860 |
| Access Level: | acceso abierto |
| Palabra clave: | Geology Geologia Àrees temàtiques de la UPC::Enginyeria civil::Geologia |
| Sumario: | [ANGLÈS] The NSC essay is one of the activities that the ANDRA – the french agency for nuclear waste management – is carrying out at the underground laboratory of Bure. The aim of this technological center is to provide accurate data about the Callivo-Oxfordian clay behaviour, preparing the site for nuclear waste stock coming from the 58 nuclear plants in France in the years to come. The build of this scientific center goes with parallel action in countries having the same issues and having chosen the same kind of stock disposal for long active nuclear waste such as Belgium and Switzerland. The NSC essay aims to prove that the sealing of a buried gallery is the best way to grant impermeability. To sum up with, the whole sealing accounts for 4 parts. These are the core, the gap, the concrete volumes and the EDZ (early damaged zone). The core is made of a blend of bentonite and sand, the up concrete volume plays the role of a injection chamber, the southern concrete volume is a fixed point and grants stability and closes the GES gallery and the EDZ is the area of the Cox (Callovo Oxfordian clay) next to the core that may be affected by his swelling during the wetting process. The experiment can be divided in many phases which the 4 first ones are construction steps. This paper focus on the 5th and 6th phases which are the wetting steo and the test of performance step respectively. Results are provided using a Code_Bright, an algorithm that uses a finite element platform to solve hydro-mechanical coupled problems with emphasis in the use of constitutive models adapted for unsatured soils with more or less swelling capacity. The parameters used for showing the results of the process are typically porosity, saturation degree, liquid pressure, unit flows, total stresses and displacements. These parameters are each time presented for each of the sealing parts, this to say, the core and gap, the EDZ and the concrete volumes. Questions related to hydraulic sensibility of the NSC essay and the amounts of water to be collected during the 5th step are answered. A description of the essay and its instrumentation and previous concepts that enable the NSC essay understanding are also reviewed. Then, some boundary conditions are changed. Also, the constitutive models ruling the behaviour of some materials are enhanced. The aim of such modifications is to complete the wide range of options for the numerical analysis of the NSC essay and improve the understanding of the whole process. It also meets with the purpose of introducing the reader to wetting paths interpretation and fulfilling the difficult process of finding new parameters for modeling soils based on experimental data. |
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