Temperature effect on in-situ THM behaviour of COx claystone

The deep geological disposal is recognised as one of the most reliable solution for long-term management of radioactive wastes. The charactisation of in-situ THM behaviour of host rock is significant for the design of the underground disposal facility and for the long-term safety [1].
Indeed, the heat generated by the waste must not affect the favourable properties of the clay host rock for containment, especially its transport properties. In the near-field (the vicinity of gallery), the excess pore pressure generated by the thermal expansion of pore water could induce fracture re-opening or propagation. In the far-field, the zone subjected to thermal loading from two neighbor galleries could induce tensile or even shear failure and/or reactivate old fractures. The above behaviour could potentially alter the permeability of host rock as a result.
The overall objective of present work is to improve the knowledge of temperature alteration effect on in-situ THM behavior of host rock, to help optimize the repository design.