ABSTRACT
Rock excavation is essential for the development of underground space. In general, rock excavation is performed by a mechanical method such as a jumbo drill or blasting using explosives. These conventional methods cause various complaints owing to factors such as dust, noise, vibration when excavating hard rocks such as granite. These complaints cause significant economic loss during the construction process. Waterjet drilling is a method for excavating rocks using only water and abrasives. Waterjets for drilling rocks can overcome problems associated with conventional rock excavation methods. The waterjet rock drilling system minimizes dust and vibration generated during the hard rock drilling process. In this study, a waterjet drilling system equipped with a double nozzle was developed. In addition, granite drilling performance was analyzed using the developed waterjet drilling system. This new drilling method reduces the construction time and cost by resolving complaints.
