Effect of in-situ stress on crack propagation in rock under blast wave
With the increasing depth of underground engineering,the influence of ground stress on the drilling and blasting method can not be ignored.In order to explore the influence of the magnitude and direction of ground stress on rock blasting,firstly,the blasting simulation method coupled with finite element(LS-DYNA)and discrete element(Particle Flow Code,PFC)are compared with the blasting test.The effectiveness of this method for the study of blasting stress wave propagation and rock crack propagation is verified,then the effect of ground stress on rock blasting is studied by using this method.The results show that the biaxial stress has little influence on the near-field cracks of rock,but has a greater inhibitory influence on the far-field cracks.The compressive effect in the direction perpendicular to the stress is enhanced,while the tensile effect is suppressed,and the number of cracks in the direction perpendicular to the stress is much smaller than that in the direction parallel to the stress.According to the characteristics of blasting engineering,a new computer simulation technology is proposed in this paper,which can provide a reference for the study of dynamic evolution of mechanical behavior of deep rock mass under complex in-situ stress conditions.
rock blastingdiscrete elementnumerical simulationcrack propagationshock wave
万方数据
维普
