Comparison of the Uniaxial Compressive Strength of the Belencito Claystone Under Stress Control and Suction Control Paths

摘要

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 sigma(CD) (crack damage stress threshold). Regardless of the level of suction, the sigma(CD) threshold occurred between 70 and 83% of the sigma(peak.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.