Extended Charge In Linear Explosion Effect And Numerical SimuLation In A Single Free Surface

Explosion of extended charge in single free face is a kind of familiar and important way in practical engineering. This way is sticking point of effecting excavating velocity and constructional cost in explosion of shaft, drift and tunnel excavating. A lot of engineering experts are studying this task now. But studying in physical process Explosion of in single free face is less satisfactory.Conclusion is theoretic counting formula of effective stress field, press field, movement of blasting cavity and blasting crater by studying in-depth for blasting theory of extended charge and model of stress wave theory.Numerical simulation of basting process of extended charge in single free face relys to mighty counting function of Ls-dyna program, and analyzes engendering and spreading of blasting stress wave and crashing process of rock in different radius of blast hole and different charge length. The beneficial conclusion by comparing result of numerical simulation and theoretical calculation is important referent value for similar blasting engineering.