Tracking degradation of argillaceous rocks using bender elements.

摘要: The results of a comprehensive experimental program focused on the study progressive degradation processes low permeability argillaceous rock induced by hydraulic cycles is presented in paper. Relative humidity were applied with vapour transfer technique, and bender elements used to evaluate evolution shear stiffness during application paths. characterisation material included determination water retention properties (water curve), as well pore size distribution using mercury intrusion porosimetry, complemented SEM micrographs elemental analysis X-ray spectroscopy characterise micro-structural features detect clayey non-clayey constituents. Results showed cumulative irreversible swelling samples relative humidity cycles. Regarding stiffness, an important reduction (around 80%) was observed at end paths applied. Evidence macro-scale linked structural modifications micro-level.