Document Type: Original Research Paper

Authors

1 Department of Mining Engineering, Faculty of Technical and Engineering, Imam Khomeini International University, Qazvin, Iran

2 Department of Geology, Faculty of Science, Imam Khomeini International University, Qazvin, Iran

10.22044/jme.2020.9520.1863

Abstract

Rock abrasivity, as one of the most important parameters affecting the rock drillability, significantly influences the drilling rate in mines. Therefore, rock abrasivity should be carefully evaluated prior to selecting and employing drilling machines. Since the tests for a rock abrasivity assessment require sophisticated laboratory equipment, empirical models can be used to predict rock abrasivity. Several indices based on five known methods have been introduced for assessing rock abrasivity including rock abrasivity index (RAI), Cerchar abrasivity index (CAI), Schimazek’s abrasivity factor (F-abrasivity), bit wear index (BWI), and LCPC abrasivity coefficient (LAC). In this work, 12 rock types with different origins were investigated using the uniaxial compressive strength (UCS), Brazilian test for tensile strength, and longitudinal wave velocity and LCPC tests, and microscopic observations were made to obtain a correlation for estimating the LCPC abrasivity coefficient by conducting the conventional rock mechanics tests. Using the equivalent quartz content, velocity of longitudinal waves, and rock brittleness index, a linear correlation was obtained with a coefficient of determination (R2) of 93.3% using SPSS in order to estimate LAC.

Keywords

[1]. Osanloo, M. (1996). Drilling Methods. Sadra Publications.

[2]. Ersoy, A. and Waller, M.D. (1995). Textural characterization of rocks. J. of Engineering Geology, Vol. 39, No. 3. Pp.123-136. DOI: 10.1016/0013-7952(95)00005-Z.

[3]. Büchi, E. and WYSS, S. (1995). Gesteinsabrasivität-ein bedeutender Kostenfaktor beim mechanischen Abbau von Fest-und Lockergestein. Tunnel, Vol. 14, No. 5. pp. 38–44.

[4]. Plinninger R., Kasling H., Thuro K. and Spaun G. (2003). Testing conditions and geomechanical properties influencing the Cerchar abrasiveness index (CAI) value. Technical note. Int J Rock Mech Min Sci, Vol. 40, No. 2, 259–263, DOI: 10.1016/S1365-1609(02)00140-5.

[5]. Deliormanl, A.H. (2012). Cerchar abrasivity index (CAI) and its relation to strength and abrasion test methods for marble stones. Construction and Building Materials, Vol. 30, pp. 16–21, DOI: 10.1016/j.conbuildmat.2011.11.023.

[6]. Thuro, K., Singer, J., Kasling, H. and Bauer, M. (2007). Determining abrasivity with the LCPC Test, In E. Eberhardt, D. Stead & T. Morrison (eds.). Proceedings of the 1st Canada–U.S. Rock Mechanics Symposium, 27.-31.05.2007, Vancouver B.C., London: Taylor & Francis.

[7]. Tripathy, A., Singh, T.N. and Kundu, J. (2015). “Prediction of abrasiveness index of some Indian rocks using soft computing methods. “Measurement, Vol. 68, pp. 302–309, DOI: 10.1016/j.measurement.2015.03.009.

[8]. Moradizadeh, M., Cheshomi, A., Ghafoori, M. and Trigh Azali, S. (2016). Correlation of equivalent quartz content, Slake durability index and Is50 with Cerchar abrasiveness index for different types of rock. International Journal of Rock Mechanics & Mining Sciences, Vol. 86, pp. 42–47, DOI: 10.1016/j.ijrmms.2016.04.003.

[9]. Abu Bakar, M.Z., Majeed, Y. and Rostami, J. (2016). Effects of rock water content on CERCHAR Abrasivity Index. Wear, Vol. 368, pp.132–145, DOI: 10.1016/j.wear.2016.09.007.

[10]. Young, K., Kon, K., Son, Y. and Jeon, S. (2016). Effect of geomechanical properties on Cerchar Abrasivity Index (CAI) and its application to TBM tunneling. Tunnelling and Underground Space Technology, 57, 99-111.

[11]. Kahraman, S., Fener, M., Käsling, H. and Thuro, K. (2016). The influences of textural parameters of grains on the LCPC abrasivity of coarse-grained igneous rocks. Tunnelling and Underground Space Technology, Vol. 58, pp. 216–223, DOI: 10.1016/j.tust.2016.05.011.

[12]. Capik, M. and Yilmaz, O. (2017). Correlation between Cerchar abrasivity index, rock properties and drill bit lifetime. Arab J Geosci, Vol. 10, No. 1.

[13]. Ataei, M. and Hosseini, S.H. (2008). “Investigation of the effect of abrasion on the rock drilling ability." Earth Sciences, Vol. 19, No. 74, pp. 137-142.

[14]. Thuro, K. (1997). Drillability prediction-geological influence in hard rock drill and blast tunneling.  Geol Runsch, Vol. 86, No. 2, pp. 426-438, DOI: 10.1007/s005310050.

[15]. Ulusay, R. and Hudson, J.A. (2007). The complete ISRM suggested methods for rock characterization, testing and monitoring. ISRM Turkish National Group, Ankara, Turkey.

[16]. Ko, T.Y., Kim, T.K., Son, Y. and Jeon, S. (2016). Effect of geomechanical properties on Cerchar Abrasivity Index (CAI) and its application to TBM tunneling. Tunnelling and Underground Space Technology, Vol. 57, pp. 99-111, DOI: 10.1016/j.tust.2016.02.006.

[17]. Hucka, V. and Das, B. (1974). “Brittleness determination of rocks by different methods. Int. J. Rock Mech. Min. Sci. Geomech. Abstr, Vol. 11, No. 10, pp. 389–392, DOI: 10.1016/0148-9062(74)91109-7.

[18]. Esmailian, M. and Rabiee, M.R (2015). “Comprehensive SPSS 22 help. Dibagaran Tehran Art & Cultural Institute, Tehran.

[19]. Taleb Beydokhti, A. (2014). Engineering Geological Characteristics of Karaj Formation Tuffs with an Emphasis on Time-Dependent Behaviors (Weathering and Creep) from North Qazvin to North Tehran. Engineering Geology PhD Thesis, Department of Basic Sciences, Bu-Ali Sina University, Hamedan, Iran.