Fig. 4From: Geomechanical behaviour of Opalinus Clay at multiple scales: results from Mont Terri rock laboratory (Switzerland)ISRM classes based on the UCS of the material (according to ISRM 1979). The UCS for Opalinus Clay at its natural water content is shown in the dark blue box. The increase in UCS with increasing suction is shown in the light blue box Back to article page