Study on Failure Evolution Process of Fractured Rock Specimen under Axial Force

Events number and 3D location distribution of Acoustic Emission (AE) are first-hand data for rock damage evolution process. It is widely used in geotechnical engineering disaster prediction and structural failure monitoring. By analyzing the destroy condition and mechanical property in simulating the axial compression test, it was found that the variation trend of acoustic emission obtained from the simulation was similar to the actual rock specimen. The total process includes four stages, namely: initial phase, premonition phase, damage phase, and residual phase. Through the simulation analysis of the fractured rock specimen, it can be found that the crack direction has a strong relationship with the internal damage of specimen. The weak surface along the shear direction has a great impact to the strength of the rock specimen which is key point in monitor. Along the axial weak surface, the inner destruction of rock specimen is more complex. In the early damage stage, the destruction is similar to the dense rock. In post stage, the rock damage along the fracture angle and weak surface.