Strain rate effects on characteristic stresses and acoustic emission properties of granite under quasi-static compression

In order to further investigate the strain rate effects on characteristic stresses and acoustic emission parameters of rock under quasi-static compression, uniaxial compressive tests were conducted cylindrical specimens measuring 50 mm in diameter 100 height using a material testing machine multi-channel monitoring system at rates ranging from 10 –6 s −1 –2 . The stress-strain curves samples, stresses, energy data, temporal spatial distribution signals obtained analyzed. experimental results certified linearly positive correlation between logarithm rates, despite fact that linear varies for different whereas ratios essentially do not change with increasing rates. input elastic damage point, UCS point failure stress exhibit when exceeds –5 Meanwhile, characteristics conversion or dissipated points explored. Based this, process compression can be divided into three stages: accumulation, dissipation, release, respectively. Besides, it is noted total number located AE events decreases as increase , majority occur during crack closure stage unstable growth stage. Finally, based perspective structural properties multi-scale defects rock, mechanism was proposed: is, subjected higher activate small-scale defects, which necessitates more external load via continuous work causes an associated stresses.