ABSTRACT
ABSTRACT: To compare the deformation characteristics of Kimachi sandstone under confined triaxial compression and under confined triaxial extension test conditions, triaxial compression tests and triaxial extension tests were carried out. The failures observed in the triaxial extension test were more brittle than those observed in the triaxial compression test. Comparison at the same mean principal stresses showed that the octahedral shear stress τoct in the triaxial compression test was higher than that in the triaxial extension test and that the volumetric strain in the triaxial compression test was smaller than that in the triaxial extension test.
