Abstract Summary
This experimental study aims to assess fatigue related risks in H2 storage projects. In particular, it focuses on the cyclic behaviour of caprock materials under large confining pressures. A series of monotonic and cyclic undrained triaxial tests were performed to investigate the response of the material. When subjected to cyclic loading, structured stiff clays were found to undergo a progressive destructuration, leading, eventually, to a fragile failure. This process was found to be controlled by loading frequency, maximum deviator stress and loading amplitude.
