Experimental and Numerical Studies on Interaction Mechanism between Joints and a Hole in Rock-like Materials under Uniaxial Compression

To investigate the influence of joints on stability underground opening, uniaxial compression tests and FE analyses based a microplane damage model for rocks has been conducted rock-like models with circular hole set non-persistent joints. It was found that peak strength Young’s modulus decrease increase in joint continuity factor k, variation them inclination angle β are W or V-shaped curves minima maxima at = 30° 90°, respectively. The failure modes specimens collapse can be related to crack coalescence between matrix. Numerical simulation reproduce main features macroscopic mechanical behavior explain anisotropic mechanism. strong interaction nearest revealed. During elastic stage, stress concentration around will altered by presence joints, effect may strengthened k. At strength, current areas transferred from surface interior due loosening localization bands/zones, higher hoop lead lower strength.