Rock drillability and abrasivity testing

Drilling rate index determined based on Brittleness and Miniature drill tests.
Granite sample prepared for Sievers’ miniature drill test in SMCOY laboratory.

In excavation drillability of the rock has significant effect on the whole operation costs. Already 50 years ago it was proven that drilling rate index has strong relationship with rock drillability (Selmer-Olsen & Blendheim, 1970). Drilling rate index is determined based on Siever’s miniature drill test and brittleness test, which describe the two most important factors of percussion drilling process. Uniaxial compressive strength can also be correlated with rock drillability with appropriate correlation (Hosseini et al., 2014), however the test type is not designed for assessing the drillability of the rock.

Drillability testing is fast, cost-efficient and reliable way to estimate excavation time and costs in advance

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Selmer-Olsen, R. and Blendheim, O.T. (1970). On the drillability of of rocks by percussive drilling. Proc. 2nd congress of the ISRM, Vol. 3. Belgrade.

Hosseini, S., Ataie, M., Aghababaie, H. (2014). A laboratory study of rock properties affecting the penetration rate of pneumatic top hammer drills. Journal of Mining and Environment, 5(1), 25-34. doi: 10.22044/jme.2014.216

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