NUMERICAL SIMULATION OF CRACK GROWTH AND ACOUSTIC EMISSION CHARACTERISTICS IN SPECIMENS WITH COLINEAR CRACKS UNDER UNIAXIAL STRESS.

In order to study the mechanical influence of different dip angles of colinear cracks on rock specimens. RFPA code is applied and numerical simulations are carried out. The crack propagation process, acoustic emission characteristics and stress-strain curves are obtained. Results show that three patterns of crack propagation which contains wing cracks, anti-wing cracks and colinear cracks are observed. Peak AE hits get larger with the increase of the inclination angles. The stress-strain curves undergoes three stages, the elastic deformation stage, the nonlinear deformation stage and the residual deformation stage and the peak stress becomes higher as the dip angles increase. The research results provide a reference for the understanding of rock failure process and the prevention of rock catastrophe. Future works should focus on the effect of the environmental contributions on the process of crack propagation. [ABSTRACT FROM AUTHOR]