Analysis of hydro-mechanical processes in a ventilated tunnel in an argillaceous rock on the basis of different modelling approaches

Autor: Benoit Garitte, Chuanqing Zhang, Antonio Gens, Shigeo Nakama, A. Millard, Christopher McDermott, Alex Bond
Přispěvatelé: Laboratoire de Mécanique Systèmes et Simulation (LM2S), Service d'Etudes Mécaniques et Thermiques (SEMT), Département de Modélisation des Systèmes et Structures (DM2S), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Modélisation des Systèmes et Structures (DM2S), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Engineering
Civil
0211 other engineering and technologies
Engineering
Multidisciplinary
02 engineering and technology
010502 geochemistry & geophysics
01 natural sciences
law.invention
[SPI]Engineering Sciences [physics]
Argillite
Hydraulic conductivity
law
Relative humidity
Geotechnical engineering
Engineering
Ocean
Diffusion (business)
Rock mass classification
Water content
Engineering
Aerospace
Engineering
Biomedical
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Darcy's law
Advection
Water permeability
Geotechnical Engineering and Engineering Geology
Computer Science
Software Engineering
Engineering
Marine
Hydro-mechanical (HM) coupling
Mont Terri Underground Rock Laboratory (URL)
Engineering
Manufacturing
Engineering
Mechanical
Numerical modelling
Ventilation (architecture)
Engineering
Industrial
Ventilation experiment (VE)
Geology
Zdroj: Journal of Rock Mechanics and Geotechnical Engineering
Journal of Rock Mechanics and Geotechnical Engineering, Elsevier, 2013, 5 (1), pp.1-17. ⟨10.1016/j.jrmge.2012.09.001⟩
Scipedia Open Access
Scipedia SL
Journal of Rock Mechanics and Geotechnical Engineering, 2013, 5 (1), pp.1-17. ⟨10.1016/j.jrmge.2012.09.001⟩
ISSN: 1674-7755
DOI: 10.1016/j.jrmge.2012.09.001⟩
Popis: In this paper, a modelling benchmark exercise from the DECOVALEX-2011 project is presented. The benchmark is based on the performance and results of a laboratory drying test and of the ventilation experiment (VE) carried out in the Mont Terri Underground Rock Laboratory (URL). Both tests involve Opalinus clay. The work aims at the identification, understanding and quantification of mechanisms taking place during the ventilation of a gallery in argillaceous host rocks on one hand and at investigating the capacity of different codes and individuals to reproduce these processes on the other hand. The 4-year in situ VE took place in a 1.3m diameter unlined tunnel and included two resaturation–desaturation cycles. The test area was equipped with over one hundred sensors (including the global water mass balance of the system, relative humidity (RH), water content, liquid pressure, relative displacement and concentration of some chemical species) to monitor the rock behaviour during ventilation. The laboratory drying experiment, carried out before the VE, was designed to mimic the in situ conditions. The work was organized in a progressive manner in terms of complexity of the computations to be performed, geared towards the full hydro-mechano-chemical (HMC) understanding of the VE, the final objective. The main results from the modelling work reported herein are that the response of the host rock to ventilation inargillaceous rocksis mainly governed by hydraulic processes (advectiveDarcy flowand non-advective vapour diffusion) and that the hydro-mechanical (TM) back coupling is weak. A ventilation experiment may thus be regarded as a large scale-long time pump test and it is used to determine thehydraulic conductivityof the rock mass.
Databáze: OpenAIRE
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