Strength Properties and Damage Evolution Mechanism of Single-Flawed Brazilian Discs: An Experimental Study and Particle Flow Simulation

Understanding the tensile strength properties and damage evolution mechanism in fissured rock is very important to fundamental research engineering design. The effects of flaw dip angle on strength, macroscopic crack propagation failure mode symmetrical Brazilian discs rock-like materials were investigated. A parallel bonding model was proposed examine pre-flawed under splitting load. microscopic parameters particles bonds that can characterize materials’ mechanical deformation obtained by calibrating against laboratory test results. development, energy characteristics Brazil containing a single pre-existing studied at scale. results show significantly weakens disc, both peak load initial cracking decrease with increasing angle. modes specimens are mainly divided into three types: wing penetration mode, tensile-shear radial mode. Except for 0°, cracks generally sprouted tip pre-flaw, tips pre-flaw centrosymmetric. Crack coalescence concentrated post-peak stage. Based particle flow code (PFC) partitions, variables characterized dissipation proposed. disc specimen’s pre-peak decreased angle, phase.