Experiment research on the rock blasting effect with radial jet cracker

Due to the low efficiency problem of cut blasting in rock drivage, a new type of jet cracker is invented. There are three development stages of this new type of radial jet cracker, and each stage has its corresponding experiment, and optimal design will be carried out based on the problems of the previous stage, but experimental principles of these radial jet crackers are still the same. The main structure of the radial jet cracker is circular tube, and there are several shaped rings designed on it, which not only can reduce charge quantity but also raise the utilization ratio of explosive energy. Experimental results show that, with this cracker, the utilization ratio of blasting hole is 98%, and the blasting efficiency and the length of cyclical footage had been improved. (C) 2015 Elsevier Ltd. All rights reserved.