Theoretical and numerical simulation investigation of deep hole dispersed charge cut blasting

Abstract Drilling and blasting methods have been used as a common driving technique for shallow-hole in rock roadways. With the advent of digital electronic detonators need increased production efficiency, traditional design is no longer suitable deep hole blasting. In this paper, disperse charge cut method was proposed to address issues low excavation depth high block rate undercut First, model illustrate mechanism dispersive process. Then, continuous dispersed models were developed using smooth particle hydrodynamics-finite element (SPH-FEM). The cutting parameters determined theoretically, efficiency introduced evaluate effect. effects two charging analyzed utilizing evolution law damage, number particles thrown, efficiency. results show that improves by about 20% breakage compared charge. addition, important such spacing, upper proportion also significant impact on Finally, technology combined with detonator through field engineering practice. It provides reference subsequent use