Shales are a fine-grained and laminated sedimentary geomaterials. Due to their particular features and their large worldwide presence in the Earth’s crust, they are of interest in several geo-engineering applications such as oil and gas extraction, CO2 sequestration and nuclear waste disposal. In light of the engineering applications many challenges exist related to the characterization of the mechanical behaviour of these geomaterials for which temperature, chemistry and unsaturated conditions play a key role. In particular, it is really important to study and understand how these materials behave in the partially saturated condition in which they are found. It is also relevant to know how their geomechanical proprieties vary due to the changes in water content.