Abstract:

Traditional formulas used for calculating the general explosive charge mass required to produce a crater only show the impacts of rock and soil types, burial depths of explosive charges, and explosion parameters. Meanwhile, there has not been a formula that is applied for calculating the linear explosive charge mass required to produce a crater, and that takes into account the effects of charge lengths. Field experience shows that destruction radius increases as a result of the increased charge length and then standstills at a given charge length value. This fact makes field blasting works challenging. It has drawn the attention of many world researchers; yet a final formula to be applied in practical term remains to be seen. By streamlining and continuing previous studies, notably those by Russian academician O.E Vlaxop, a group of researchers headed by Lê Văn Trung has studied blasting works conducted in soil and rock environments with reference to pressure using a general oval-shaped charge mass. Based on the explosion waves produced by linear charges, this group studies their change in shape from cylindrical to elliptical and finally orbicular as they move away from explosion center. The discovery of the pressure absorption of soil and rock, the evolution of explosion waves is the core features and successes of the group's success. The research results produce a generalized theoretical formula that is used to develop linear charges for creating craters