Numerical Simulation of the Effect of Decoupling Coefficient on Concentrated Energy Blasting under Prestressed Conditions
In order to explore the influence of uncoupled charge coefficient on the rock breaking effect of a shaped charge under the condition of pre-stress,based on the finite element software ANSYS/LS-DYNA,the numerical study on blasting effect under the coupling action of pre-stress,uncoupled charge coefficient and initiation mode was carried out,the rock-breaking ability of the charge was analyzed by monitoring the peak pressure on the inner wall of the borehole.The calculation results show that:the pre-stress has little effect on the crush zone caused by explosion,but has an obvious inhibitory effect on the length of the main crack in the fracture zone.Under the condition of σx=σz=14 MPa,σy=7 MPa,the peak pressure on the inner wall of the borehole decreases gradually with the increase of the uncoupling charge coefficient,the increasing of detonation pressure on the energy cumulative side of the shaped charge decreases at first and then increases.The detonation pressure on the concentrated side of the shaped charge increases by 26.3％in the coupling charge,the detonation pressure on the energy cumulative side increases by 22.1％when the uncoupling charge coefficient K=1.6.Compared with the central point initiation charge,the peak pressure of the shaped charge on the inner wall of the borehole increases by 11.9％,and the damage area increases by 15.1％.It has obvious directional effect.The research results have a certain guiding significance for the application of detonation concentrated blasting technology in deep high ground stress.
prestressdecoupling coefficientdetonation energy accumulationdeep rock massnumerical simulation
万方数据
维普
