Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

The progressive collapse behavior and energy release of columnar jointed basalts (CJBs) can be greatly influenced by different joint distance ratios. By adopting the digital image correlation, a series heterogeneous CJB models are established. continuous fracture process acoustic emissions (AEs) captured numerically under varying lateral pressures. load curves ratios model boundaries analyzed. Meanwhile, strength, deformation modulus AE rule discussed. data indicate that plane strain, troughs compression strength appear at column dip angle β = 30°, 150°, 210° or 330°; equivalent changes in an elliptical way with increasing; higher than case between stress strain When accumulation corresponding to peak but becomes lower when increases 60°, which implies critical transformation energy-related failure precursor affected angle. These achievements will contribute design, construction support slopes tunnels encountering CJBs.