Performance analysis of drilling machines using rock modulus ratio

Rotary drills, diamond drills and percussive drills have been extensively used in open pits, quarries and construction sites. The prediction of the penetration rate of drilling machines is very important in the cost estimation and the planning of the rock excavation projects. The rock modulus ratio, which is the ratio of elastic modulus to compressive strength, indicating the deformability, is a very important rock property. However, there is no available published material on the relationship between modulus ratio and drillability. In this study, the correlations between the modulus ratio and drillability were statistically analysed using the raw data obtained from the experimental studies of different researchers. Rock properties and performance data obtained from the works of different researchers were listed in the respective tables.