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  The Kinetic Energy of Abrasive Particles Considering Specific Gravity in Waterjet Rock Cutting

  Waterjet technology has been increasingly applied to civil engineering such as rock excavation or concrete demolition from its various advantages. However, recent performance studies, based on the complex influence of the waterjet systems, lack sufficient theoretical approaches to be adequately applied to civil engineering. In particular, research on the particle kinetic energy is important for predicting performance and for planning excavation. In this study, the kinetic energy model considering the type of abrasives in the waterjet was verified theoretically and experimentally. For the analysis according to abrasive properties, steel shot and garnet were used and granite, the most common rock in Korea, was used as a cutting target. As a result, an abrasive particle energy equation based on the abrasive particle properties such as specific gravity and its diameter was proposed and verified with the result of a rock excavation experiment. Through this study, the relationship between the abrasive particle energy and the cutting performance was demonstrated.

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