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Reliability of empirical equations to predict uniaxial compressive strength of rocks using Schmidt hammer

ABSTRACT While the direct measurement of uniaxial compressive strength (UCS) of rocks is expensive and time-consuming, many empirical equations were developed to predict UCS of rocks by the indirect method such as Schmidt hammer rebound number (RL). However, to the best of our knowledge, the reliability of these equations is not investigated. The aim of this paper is to check the reliability of the available empirical equations to predict UCS for limestone rocks using L-type Schmidt hammer (RL) test. A total of 112 core sample test results of limestone rocks, which were collected from four different borrow areas in Iraq, were measured. Results of this study showed that the equation developed by Arslan et al., 2015 [“Prediction of Durability and Strength from Schmidt Rebound Hammer Number for Limestone Rocks from Salt Range, Pakistan.” Journal of Himalayan Earth Science 48: 1] is the more reliable regression model to predict UCS from RL. Furthermore, the performance of the selected equation is enhanced using the measured values of UCS from this study.