Application Study On Blasting In Rock With Shaped Charge

With the development of science and technology, more and more rock blasting relate to shaped charges. In order to get excavated faces with even faces in rock blasting, to increase the finishing product rate in mining rock, and to improve the stability of surface profiles, the ordinary smooth blasting can' t satisfy all requirements from all sides. The directional fracture controlled blasting, which is an emerging blasting methodology that is developing in recent years by utilizing the advantages of smooth blasting, is widely used in rock blasting. The directional fracture controlled blasting with shaped charge is a satisfied blasting with a little explosive. The process of cutting rock with LSC (linear shaped charge) is a complex one of two-dimensional non-steady dynamics, and the complexity of rock mass feature brings many difficulties to related theoretical researches and field experiments.Penetration mechanism of cumulative energy jet is analyzed and engineering calculation of jet is generalized, the calculation expressions related to penetration and critical condition of forming cumulative energy jet are summarized. At the same time, formation and development of blasting theories, the propagation characteristic of explosion stress wave in rock are expounded.Based on the dynamics of explosion and fracture mechanics, the mechanism of crack initiation and its expansion of directional fracture controlled blasting by shaped charge with wedge-type liners in rock were rough studied macroscopically. The blasting parameters and their designs are expounded, and cumulative energy effect is in detail discussed by molecular interaction potential in a microscopic level. In paper, the rock around boreholes are considered infinite elastic mass with circular drill way,...