Effect of jet dispersion on the underground excavation in rock using abrasive waterjet

Abstract

An abrasive waterjet with low noise and vibration characteristics enables effective rock excavation. For deep excavation, it is necessary to insert the waterjet nozzle into pre-drilled holes, which requires ensuring a sufficient excavation width. In this study, we set the standoff distance and focusing tube length as variables that dominantly influence the excavation width. An experimental test was conducted to investigate the dispersion of the jet based on different standoff distances and focusing tube lengths. This research has the potential to enhance the efficiency of rock excavation by enabling accurate estimation and control of the excavation width. Operators can improve productivity and minimize disturbances during excavation operations by optimizing these parameters.