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Correlation between Cerchar abrasivity index, rock properties, and drill bit lifetime

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Abstract

The Cerchar abrasivity index (CAI) is one of the most widely known index method for identification of rock abrasivity. It is a simple and fast testing method providing reliable information on rock abrasiveness. In this study, the relationships between the CAI and some rock properties such as uniaxial compressive strength (UCS), point load strength, Brazilian tensile strength and Schmidt rebound hardness, and equivalent quartz content (EQC) are examined. The relationships between the CAI and drill bit lifetime is also investigated and the type of drill bit wear observed is mentioned. Additionally, the CAI is modeled using simple and multiple linear regression analysis based on the rock properties. Drill bit lifetime is also modeled based on the CAI. The results show that the CAI increases with the increase of the UCS, point load strength, Brazilian tensile strength, L-type and N-type Schmidt rebound hardness, and the EQC. It is concluded that the higher and the lower bit lifetime are obtained for marl and andesitic-basaltic formation, respectively. Moreover, flushing holes, inserted button, button removal, and failures of button on the bits are determined as the type of drill bit wear. The modeling results show that the models based on the UCS and the EQC give the better forecasting performances for the CAI.

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Acknowledgements

The authors would like to thank Karadeniz Technical University, Scientific Research Projects Units for the financial support (Project Number: 8683). Furthermore, the authors greatly appreciate NAS-YSE and AS-YOL Construction Company for the permission of collecting data in the tunnels. The thin section tests were carried out in Istanbul Technical University with the generous helps of Assoc. Prof. Gultekin Topuz. Additionally, the authors are thankful to Assoc. Prof. Gokhan Aydin for his suggestions to improve the manuscript quality. Finally, the authors gratefully acknowledge Assoc. Prof. Olgay Yarali (Zonguldak, Turkey).

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  1. Department of Mining Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    Mehmet Capik & Ali Osman Yilmaz

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  1. Mehmet Capik
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  2. Ali Osman Yilmaz
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Correspondence to Mehmet Capik.

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Capik, M., Yilmaz, A.O. Correlation between Cerchar abrasivity index, rock properties, and drill bit lifetime. Arab J Geosci 10, 15 (2017). https://doi.org/10.1007/s12517-016-2798-7

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