Numerical Study on the Dynamic Propagation Model of Cracks from Different Angles under the Effect of Circular Hole Explosion

A dynamic disturbance will induce cracks around the tunnel in blasting or shield construction. To investigate overall stability of with various angles during a fixed borehole (round hole explosion) blasting, models containing an individual crack different were introduced for simulation research. The research set up thin sheet model length 350 mm and width 150 mm, 7 diameter pre-existing 75 5 middle. evolution stress wave propagation simulated using AUTODYN software. And this study, theory is used to creatively explain load under action formation reasons danger zone. results indicate that from have impact on blast new generated itself. At 45–90°, direct reflected waves promote some faster growth rates than others, these special growths longer lengths more easily connect free surface other cracks, resulting instability. conditions are consistent prediction made by study. certain guiding significance analysis hazardous area existing cracks.