AE energy evolution during CJB fracture affected by rock heterogeneity and column irregularity under lateral pressure

Considering that the mechanical mechanism and energy release law of gradual failure columnar jointed basalt (CJB) are affected by lateral pressure, rock heterogeneity column irregularity, etc., numerical CJB models with various dip angles, irregularity degrees pressures were established through digital image correlation. The progressive process released CJBs simulated under loading rate 0.05 mm/step based continuum mechanics statistical damage theory. influences inhomogeneity, degree, model boundary on nonlinear deformation comprehensively investigated. results demonstrate effect inhomogeneity index depends angle, equivalent modulus is more sensitive to than pressure. Moreover, compressive strength along direction perpendicular axis basically decreases degree increasing when meso 120 MPa. Besides, properties elastic irregular greatly boundaries. These achievements will contribute understanding inner evolution CJBs.