Stress wave superposition effect and crack initiation mechanism between two adjacent boreholes

In rock blasting, the effect that stress wave superposition between boreholes has on fragmentation remains controversial. Here, we experimentally study two adjacent by combining model experiment method and high-speed digital image correlation experimental system. Numerical simulations based continuous-discontinuous element are also used to analyze crack initiation mechanism boreholes. The results show that, in area boreholes, component direction of connection line is mainly compressive, while perpendicular tensile. Superposition blasting waves strengthens both components, but strengthening (mainly tensile) significantly less than compressive). Moreover, these enhancements not sufficient induce simulation analysis further shows relatively stringent requirements explosive parameters, properties borehole spacing, which difficult observe engineering practice experiments.