Drillability Evaluation of Limestone Rock Quarries in Punjab and Khyber Pakhtunkhwa, Pakistan

Muhammad Mansoor Iqbal, Zubair Abu Bakar


The Compressive and Tensile Strengths of the rocks vis-a-vis Brittleness concepts (BCs) have often been used by various researchers to find empirical relations for the evaluation of drillability of the rocks. In this work the Uniaxial Compressive Strength (UCS), Brazilian Tensile Strength (BTS) and five BCs (B1, B2, B3, B4, and B5) have been used to evaluate the drillability of the Limestone Rock quarries. For this purpose representative block samples of limestone rock were collected from the quarries of four Cement Factories which are operative in Sakesar and Samana Suk Formations of Punjab and Khyber Pakhtunkhwa (KPK), Pakistan. UCS and BTS tests were conducted for the determination of BCs (B1, B2, B3, B4, and B5), whereas the Sievers’ J- Miniature drill tests and Brittleness (S20) Tests were conducted in the laboratory to find the Drilling Rate Index (DRI) of the rocks. The measured indices of the rocks were correlated with the rock strength parameters and BCs. Strong linear decreasing relations were found between DRI, UCS, BCs values B3, B4, and B5, whereas weak relations were found between DRI, BTS, BCs values B1 and B2.

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