Abstract
The uniaxial compressive strength of Belencito claystone was studied through stress control and suction control path tests. Short-term uniaxial compression tests on conditioned specimens at different values of suction and long-term hydro-mechanical tests using a climatic box were performed. Volumetric deformation data and acoustic emission measurements from the short-term tests were used to determine σCD (crack damage stress threshold). Regardless of the level of suction, the σCD threshold occurred between 70 and 83% of the σpeak.short-term. The experimental results confirmed that the interpretation made by Brace and Bombolakis (J Geophys Res 68:3709–3713, 1963) and Bieniawski (Int J Rock Mech Min Sci 4:395–406, 1967) regarding long-term and short-term rock strength remains valid when considering the hydro-mechanical behaviour.
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