Research on damage evolution mechanism of layered rock mass under blasting load

Rock mass consisted of lots of discontinuities, such as faults, joints, etc, and the layered joints are a common kind of rock mass structure. The joints affected the stress wave propagation, and blasting is one economical and efficient rock breaking method for rock mass engineering. So, rock mass fragmentation effect and construction progress are affected by these layered joints. The numerical studies were carried out to analyze the damage evolution process of intact rock and rock mass with layered joints subjected to blasting load based on the RHT model in the LS-DYNA software, and the effect of the location of initiation points, fracture distribution on dynamic damage evolution of the rock mass was discussed. It is useful to know the damage mechanism of the rock mass with layered joints and to improve the effect of rock mass fragmentation by blasting. These results have very important theoretical significance and application value for optimization of the blasting construction technology.