In Geotechnical Engineering, determining the Unconfined Compressive Strength (UCS) of rock is of prime importance as their role in design and analysis of geotechnical problems is crucial. Although laboratory test is the most direct way for estimating the rock compressive strength but UCS determination in the laboratory would be problematic if the rock masses are weathered mainly because obtaining proper core segments for testing purpose is difficult in this situation. Hence, the use of index testing as an alternative for predicting UCS is investigated by researchers. It is well established that indirect tensile strength or Brazilian Tensile Strength (BTS) is related to UCS. In this paper, in order to develop a new correlation between UCS and BTS, some laboratory tests on dry limestone specimens including 20 Unconfined Compression Tests (UCT) and 20 Brazilian Tests (BT) have been conducted. The paper also reviews some recent correlations between UCS and BTS as well as investigates the reliability of these correlations. Findings show the results of the experimental tests are in good agreement with previous studies. Based on the results, new strong correlation with coefficient of determination of 0.9 is introduced for predicting the UCS of limestone core samples from its BTS. A critical review on the degree of accuracy of recent correlations between UCS and BTS shows that apart from Kahraman`s correlation, other correlations either overestimate or under estimate UCS of rock samples to a significant amount.
کلید واژگان :Brazilian Test, Indirect Tensile Strength, Limestone, Unconfined Compressive Strength.
ارزش ریالی : 600000 ریال
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