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Introduction to the Task A Task Force Meeting B. Garitte and A. Gens 2nd DECOVALEX 2011 workshop, 20 th of October 2008, Wakkanai, Japan Dept. of Geotechnical Engineering and Geosciences TECHNICAL UNIVERSITY OF CATALONIA (UPC)
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Data from VE test (NF-PRO)
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Schedule of Task A Background of Task A Description of step 0 Participants Index
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Schedule of Task A Step 0: Identification of relevant processes and of Opalinus Clay parameters. Modelling of the laboratory drying test. Step 1: Hydromechanical modelling up to the end of Phase 1. Step 2: Hydromechanical modelling up to the end of Phase 2 using parameters backcalculated from step 1. Advanced features as permeability anisotropy, rock damage and permeability increase in the damaged zone may be considered. Step 3: Hydromechanical and geochemical modelling of the full test. Conservative transport and one species considered. Step 4: Hydromechanical and geochemical modelling of the full test. Reactive transport and full geochemical model (optional).
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Schedule of Task A Step 0: Identification of relevant processes and of Opalinus Clay parameters. Modelling of the laboratory drying test. Step 1: Hydromechanical modelling up to the end of Phase 1. Step 2: Hydromechanical modelling up to the end of Phase 2 using parameters backcalculated from step 1. Advanced features as permeability anisotropy, rock damage and permeability increase in the damaged zone may be considered. Step 3: Hydromechanical and geochemical modelling of the full test. Conservative transport and one species considered. Step 4: Hydromechanical and geochemical modelling of the full test. Reactive transport and full geochemical model (optional).
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Schedule of Task A Step 0: Identification of relevant processes and of Opalinus Clay parameters. Modelling of the laboratory drying test. Step 1: Hydromechanical modelling up to the end of Phase 1. Step 2: Hydromechanical modelling up to the end of Phase 2 using parameters backcalculated from step 1. Advanced features as permeability anisotropy, rock damage and permeability increase in the damaged zone may be considered. Step 3: Hydromechanical and geochemical modelling of the full test. Conservative transport and one species considered. Step 4: Hydromechanical and geochemical modelling of the full test. Reactive transport and full geochemical model (optional).
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Granite 200m – 450 m deep Generic, purpose-built Opalinus (hard) clay 400m deep Generic, not purpose-built C-O argillite (hard clay) 450m – 520 m deep Site-specific Boom clay (plastic) 230m deep Generic, purpose-built Rock salt 490m – 800m deep Generic, not purpose-built Granite 450m deep Generic, not purpose-built Background of Task A
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Mont Terri Project Located in Northern Switzerland Opalinus clay (shale) 400 m deep Operating since 1995 Generic, not purpose - built 1: Mont Terri rock laboratory, 400 m beneath the hill 2: Southern entrance of the motorway tunnel Source: Mont Terri website Background of Task A
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Overconsolidated clay Low porosity (±15%) Water content (±6%) Density (2.45 g/cm 3 ) Low permeability (±10 -13 m/s) Variation of stiffness (2 to 10 GPa) UCS (10 to 20 MPa) Anisotropic material Temperature Mechanical (Strength and stiffness) Hydraulic (?: selfhealing) Stiff layered Mesozoic clay of marine origin Background of Task A
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Location of the ventilation test Raise bored horizontal microtunnel
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Background of Task A Ventilation test section MI niche 1.3m
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Background of Task A Saturation 1: 11 months Desaturation 1: 8 months Saturation 2: 11.5 months Desaturation 2: 20.5 months Continuous water mass balance Water content profiles Relative humidity Water pressure Displacements Geochemical characterization Ventilation test
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Objective of Task A The main objective of the task is to examine the hydromechanical and chemical changes that may occur in argillaceous host rocks, especially in relation to the ventilation of drifts.
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Description of step 0 Objectives: Brainstorming about theoretical formulations to be used in Task A Determination of a set of parameters for Opalinus Clay Reproduction of a laboratory drying experiment (Floria et al, 2002) Material provided: Physical prop. All (project data), water content prof. Hydraulic prop. Floria (2002), Muñoz (2003), Solexperts (2003) Mechanical prop. Bock (2001) Hydro-Mech. coupling Various Hydro-Mechanical info from chemical reports. Traber ( 2003, 2004), Fernandez (2007), Noy (2003)
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Description of step 0 Drying test: lay out
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Description of step 0 Impermeable lateral boundaries 10cm 28cm Temperature 30ºC Relative humidity [%] 20% 50% 142 days
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Description of step 0 Impermeable lateral boundaries 10cm 28cm Air velocity [cm/s] 30 [cm/s] 70 [cm/s] 9000gr. Mass [grams] Water pan: = 9.2cm
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Description of step 0 Water content profiles Water lost during drying Initial water content (porosity = 16%), = 7%. Amount to 352gr. water 59gr. water 60gr. water
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Description of step 0 Water content profiles Water lost during drying Initial water content (porosity = 16%), = 7%. Amount to 352gr. water 121gr. water 130gr. water
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Description of step 0 Water content profiles Water lost during drying Initial water content (porosity = 16%), = 7%. Amount to 352gr. water
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Description of step 0 Water content profiles Water lost during drying Initial water content (porosity = 16%), = 7%. Amount to 352gr. water 151gr. water 156gr. water
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Participants Modelling teamCASCEAJAEAQuintessaUoE PersonLiu Xiaoyan/Jing LanruAlain Millard Shigeo Nakama Alex BondChris McDermott On behalf ofWHUIRSNJAEANDA CountryChinaFranceJapanUK Comparison issues between different teams: (T)H(M) formulation Parameter set for Opalinus Clay Model setup (top boundary condition) Model results
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Participants CASCEAJAEAQuintessaUoE Physical Solid grain densityρ s [kg/m3] Porosityφ Hydraulic Intrinsic permeabilityk [m2] Dynamic viscosityμ [Pa.s] Liquid relative permeabilityλ’ Vapour diffusion coefficient Mechanical Young modulusE [GPa] Poisson coefficientν Friction angleφ [º] Cohesionc [MPa] Hydro-Mech. coupling Suction bulk modulusK s [GPa] Air entry value (retention curve)P 0 [MPa] Shape parameter (retention curve)λ Maximum suction (retention curve)*P s [MPa] Second shape parameter (retention curve)*λsλs Residual and maximum saturation (retention curve)S rl – S rs * Modified Van Genuchten
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Participants CASCEAJAEAQuintessaUoE Physical Solid grain densityρ s [kg/m3] Porosityφ Hydraulic Intrinsic permeabilityk [m2] Dynamic viscosityμ [Pa.s] Liquid relative permeabilityλ’ Vapour diffusion coefficient Mechanical Young modulusE [GPa] Poisson coefficientν Friction angleφ [º] Cohesionc [MPa] Hydro-Mech. coupling Suction bulk modulusK s [GPa] Air entry value (retention curve)P 0 [MPa] Shape parameter (retention curve)λ Maximum suction (retention curve)*P s [MPa] Second shape parameter (retention curve)*λsλs Residual and maximum saturation (retention curve)S rl – S rs * Modified Van Genuchten
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Participants CASCEAJAEAQuintessaUoE Physical Solid grain densityρ s [kg/m3] Porosityφ Hydraulic Intrinsic permeabilityk [m2] Dynamic viscosityμ [Pa.s] Liquid relative permeabilityλ’ Vapour diffusion coefficient Mechanical Young modulusE [GPa] Poisson coefficientν Friction angleφ [º] Cohesionc [MPa] Hydro-Mech. coupling Suction bulk modulusK s [GPa] Air entry value (retention curve)P 0 [MPa] Shape parameter (retention curve)λ Maximum suction (retention curve)*P s [MPa] Second shape parameter (retention curve)*λsλs Residual and maximum saturation (retention curve)S rl – S rs * Modified Van Genuchten
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Participants CASCEAJAEAQuintessaUoE Physical Solid grain densityρ s [kg/m3] Porosityφ Hydraulic Intrinsic permeabilityk [m2] Dynamic viscosityμ [Pa.s] Liquid relative permeabilityλ’ Vapour diffusion coefficient Mechanical Young modulusE [GPa] Poisson coefficientν Friction angleφ [º] Cohesionc [MPa] Hydro-Mech. coupling Suction bulk modulusK s [GPa] Air entry value (retention curve)P 0 [MPa] Shape parameter (retention curve)λ Maximum suction (retention curve)*P s [MPa] Second shape parameter (retention curve)*λsλs Residual and maximum saturation (retention curve)S rl – S rs * Modified Van Genuchten
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Participants CASCEAJAEAQuintessaUoE Physical Solid grain densityρ s [kg/m3] Porosityφ Hydraulic Intrinsic permeabilityk [m2] Dynamic viscosityμ [Pa.s] Liquid relative permeabilityλ’ Vapour diffusion coefficient Mechanical Young modulusE [GPa] Poisson coefficientν Friction angleφ [º] Cohesionc [MPa] Hydro-Mech. coupling Suction bulk modulusK s [GPa] Air entry value (retention curve)P 0 [MPa] Shape parameter (retention curve)λ Maximum suction (retention curve)*P s [MPa] Second shape parameter (retention curve)*λsλs Residual and maximum saturation (retention curve)S rl – S rs * Modified Van Genuchten
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