Examining the relation between rock mass cuttability index and rock drilling properties

• Equations are suggested considering correlation coefficients among DRI, RMCI values and rock properties.
• Most effective rock property in estimating DRI and RMCI values is found as Schmidt hardness.
• Most suitable interval for excavation machine has been found out as 15 m3/h–46 m3/h.

Drilling rate is a substantial index value in drilling and excavation operations at mining. It is not only a help in determining physical and mechanical features of rocks, but also delivers strong estimations about instantaneous cutting rates. By this way, work durations to be finished on time, proper machine/equipment selection and efficient excavation works can be achieved. In this study, physical and mechanical properties of surrounding rocks and ore zones are determined by investigations carried out on specimens taken from an underground ore mine. Later, relationships among rock mass classifications, drillability rates, cuttability, and abrasivity have been investigated using multi regression analysis. As a result, equations having high regression rates have been found out among instantaneous cutting rates and geomechanical properties of rocks. Moreover, excavation machine selection for the study area has been made at the best possible interval.

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