定向断裂控制爆破中空孔间距的理论计算和数值模拟

he best empty hole spacing in directional fracture controlled blasting is studied in this paper。It's concluded that blasting stress wave propagation in rockmass and stress concentration of the empty hole in theory first.Then based on theory of the strength,explosion and elastic mechanics , Analysis the relationship between empty hole spacing and the blasting parameters and get the best choice of empty hole spacing in theory. The best charge hole spacing of theoretical analysis and andnumerical simulation are 1056mm and 1140mm when there is a empty hole between two charging holes,but they are 592mm and 680mm when there's no empty holes through actual an example. The numerical simulation results are identical to the theoretical analysis .So laying empty blast hole not only can enhance explosive energy utilization ration obviously,but can reduce the effect of the blasting seism.