Introduction to the Task A Task Force Meeting B. Garitte and A. Gens 2nd DECOVALEX 2011 workshop, 20...

Introduction to the Task A Task Force Meeting

B. Garitte and A. Gens

2nd DECOVALEX 2011 workshop, 20th of October 2008, Wakkanai , Japan

Dept. of Geotechnical Engineering and GeosciencesTECHNICAL UNIVERSITY OF CATALONIA (UPC)

Data from VE test (NF-PRO)

Schedule of Task A

Background of Task A

Description of step 0

Participants

Index

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).

Granite200m – 450 m deepGeneric, purpose-built

Opalinus (hard) clay400m deepGeneric, not purpose-built

C-O argillite (hard clay)450m – 520 m deep Site-specific

Boom clay (plastic)230m deepGeneric, purpose-built

Rock salt490m – 800m deepGeneric, not purpose-built

Granite450m deepGeneric, not purpose-built


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 hill2: Southern entrance of the motorway tunnelSource: Mont Terri website


• Overconsolidated clay

• Low porosity (±15%)

• Water content (±6%)

• Density (2.45 g/cm3)

• Low permeability (±10-13m/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



Location of the ventilation test

Raise bored horizontal microtunnel


Ventilation test section

Section SA3

In flow

RH-out

Water pan 1SA1

SB1 SC1SA2 SD1 SE

SC2 SB2SD2 SA4

SA3

Rear doors

Out flow

RH-outRH-in RH-1 RH-2

Water Pan 2

RH-in

Instru m ented section:SA : M in i P ie zo m e tersSB : H um id ity se ns orsSC : T D RsSD : Exten so m e te rsSE : G e oe le ctric

Forward doors

Le gend :

R H-n : hyg ro m e te rRH-rRH-l

10 m

7 m

1,50 m

1,00 m

0,65 m

0,65 m

0,60 m

0,60 m

0,60 m

0,60 m

1,00 m

0,65 m

0,65 m

1,50 m

MI niche1.3m

0

10

20

30

40

50

60

70

80

90

100

11/03/1997

24/07/1998

06/12/1999

19/04/2001

01/09/2002

14/01/2004

28/05/2005

10/10/2006

22/02/2008

06/07/2009

18/11/2010

Time

Re

lati

ve h

um

idit

y o

f in

co

min

g a

ir

[%]

9/4

/98:

Exc

. NG

1/2

/99:

Exc

. MT

8/7

/02:

Sea

ling

ve

ntil

ate

d s

ect

ion

24/9/06

8/7/02

28/5/03 29/1/04 11/7/05


Section SA3

In flow

RH-out

Water pan 1SA1

SB1 SC1SA2 SD1 SE

SC2 SB2SD2 SA4

SA3

Rear doors

Out flow

RH-outRH-in RH-1 RH-2

Water Pan 2

RH-in

Instru m ented section:SA : M in i P ie zo m e tersSB : H um id ity se ns orsSC : T D RsSD : Exten so m e te rsSE : G e oe le ctric

Forward doors

Le gend :

R H-n : hyg ro m e te rRH-rRH-l

10 m

7 m

1,50 m

1,00 m

0,65 m

0,65 m

0,60 m

0,60 m

0,60 m

0,60 m

1,00 m

0,65 m

0,65 m

1,50 m

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

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.


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)


Drying test: lay out


Impermeable lateral boundaries

10cm

28cm

Tem

per

atu

re 30ºC

Rel

ativ

e h

um

idit

y [%

]

20%

50%

142 days


Impermeable lateral boundaries

10cm

28cm

Air

vel

oci

ty [

cm/s

]

30 [cm/s]

70 [cm/s]

9000gr.

Mas

s [g

ram

s]

Water pan: = 9.2cm


0

0.05

0.1

0.15

0.2

0.25

0 2 4 6 8water content [%]

dis

tan

ce t

o b

ase

[m]

Initial water content

Measurements at 21 days

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0 50 100 150Time [days]

Wat

er l

oss

[kg

]

Sample C


Water lost during drying

Initial water content (porosity = 16%), = 7%. Amount to 352gr. water

59gr. water

60gr. water

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0 50 100 150Time [days]

Wat

er l

oss

[kg

]

Sample B Sample C

0

0.05

0.1

0.15

0.2

0.25


dis

tan

ce t

o b

ase

[m]








121gr. water

130gr. water

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0 50 100 150Time [days]

Wat

er l

oss

[kg

]

Sample A Sample B Sample C

0

0.05

0.1

0.15

0.2

0.25


dis

tan

ce t

o b

ase

[m]









0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0 50 100 150Time [days]

Wat

er l

oss

[kg

]

Sample A Sample B Sample C

0

0.05

0.1

0.15

0.2

0.25


dis

tan

ce t

o b

ase

[m]









151gr. water

156gr. water

Participants

Modelling team CAS CEA JAEA Quintessa UoE

Person Liu Xiaoyan/Jing Lanru Alain Millard Shigeo Nakama Alex Bond Chris McDermott

On behalf of WHU IRSN JAEA NDA NDA

Country China France Japan UK UK

Comparison issues between different teams:

(T)H(M) formulation

Parameter set for Opalinus Clay

Model setup (top boundary condition)

Model results

Participants

CAS CEA JAEA Quintessa UoE

Physical

Solid grain density ρs [kg/m3]

Porosity φ

Hydraulic

Intrinsic permeability k [m2]

Dynamic viscosity μ [Pa.s]

Liquid relative permeability λ’

Vapour diffusion coefficient

Mechanical

Young modulus E [GPa]

Poisson coefficient ν

Friction angle φ [º]

Cohesion c [MPa]

Hydro-Mech. coupling

Suction bulk modulus Ks [GPa]

Air entry value (retention curve) P0 [MPa]

Shape parameter (retention curve) λ

Maximum suction (retention curve)* Ps [MPa]

Second shape parameter (retention curve)* λs

Residual and maximum saturation (retention curve) Srl – Srs

2 /wgD m s

* Modified Van Genuchten

Participants

CAS CEA JAEA Quintessa UoE

Physical

Solid grain density ρs [kg/m3]

Porosity φ

Hydraulic

Intrinsic permeability k [m2]

Dynamic viscosity μ [Pa.s]

Liquid relative permeability λ’

Vapour diffusion coefficient

Mechanical

Young modulus E [GPa]

Poisson coefficient ν

Friction angle φ [º]

Cohesion c [MPa]

Hydro-Mech. coupling

Suction bulk modulus Ks [GPa]

Air entry value (retention curve) P0 [MPa]

Shape parameter (retention curve) λ

Maximum suction (retention curve)* Ps [MPa]

Second shape parameter (retention curve)* λs

Residual and maximum saturation (retention curve) Srl – Srs

2 /wgD m s

* Modified Van Genuchten

0.1

1

10

100

1000

0 0.2 0.4 0.6 0.8 1Degree of saturation

Pg

-Pl [

MP

a]

Drying Path (Muñoz, 2003)

Wetting Path (Muñoz, 2003)

Gens (2000)

Drying path (Zhang, 2005)

Wetting path (Zhang, 2005)

Drying path (Villar, 2007)

Introduction to the Task A Task Force Meeting B. Garitte and A. Gens 2nd DECOVALEX 2011 workshop, 20...

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Transcript of Introduction to the Task A Task Force Meeting B. Garitte and A. Gens 2nd DECOVALEX 2011 workshop, 20...