Simulation And Experiment Studies On Medium-length Borehole Cut Blasting And Fragement Control

The research of cut blasting with slotted charge and fragment control were carried out, in which theoretical analysis, numerical simulation and field test combined methods were adopted. Slotted charge cut blasting of both rectanglar and trianglar borehole distribution were simulated according 2-borehole blasting results. The propagation law of stress wave between boreholes was analyzed. Three types of air-deck charge structures and different initiation methods were considered. The simulation results manifested that well-proportioned and bigger average pressure could be achieved, with increased charge quality at top and bottom initiation. At last, the simulation results were validated by cut blasting and air-deck charge field tests. Field tests showed that the utilization rate of borehole was increased significently, and the average utilization rate of borehole reached to 93%. The blasting fragment was improved effectively with the optimized air-deck charge structure.