Abstract：The stress-strain curves of deep fine sandstone were obtained by using a typical material test( TMT)method and a digital-image-correlation( DIC) method. The effects of strain rates and saturated water of the specimens on the stress-strain curves were analyzed. By using the DIC method,the variations of the strains were investigated at different positions in the specimens with the time during the tests. It was found that the strains in the specimens were not uniform during the failure process. Based on the comparison between TMT and DIC results,the applicable range of the TMT method was discussed. Using scanning electron microscope,the fracture surface of recovered specimens was observed so as to investigate the effect of loading rates and saturability on the failure mode of rock in quasi-static compressive tests.

Keyword：deep fine sandstone;digital-image-correlation method;strain distribution;strain rate effect;failure mode;