Description of work
A synthesis will be reported integrating the work previously performed on Boom Clay, Opalinus Clay and Callovo-Oxordian Clay. The report will be a literature review of the state of the art in the field of the thermo-hydro-mechanical behaviour of clays and the acceptable thermal limits that the host rock could sustain. Quantitative evidence for stress dependent permeability under isothermal and non-isothermal conditions will be collected. The survey will be mainly based on:
- Isothermal hydro-mechanical tests at ambient and elevated temperatures in laboratory on natural and reconstructed clays
- in-situ tests realised at Mont Terri and at Mol: ATLAS, HG-A, EZ-A, HE, GP-A/GS
- results from previous and ongoing EC projects CATSIUS CLAY, SELFRAC, EB, SAFETI and NF-PRO
This work will allow
- - Delineate the most important temperature-dependent material properties
- - Define the most important coupled governing processes and parameters
- - To assess the effect of discrete fractures and fracture connectivity on the effective hydraulic properties of the DZ.
- - To assess the importance of the chemical impact for each type of rock
- - To establish the state of the art in the constitutive models
In the frame of this workpackage the terminology EDZ and EdZ as defined during the EC Cluster Conference Workshop,
Luxembourg, 3 to 5 Nov. 2003 will be extended to the TDZ/TdZ and the CDZ/CdZ.