Abstract
Nine rock types including Sandstone, Limestone, Siltstone, Dolomite and Marl collected from six
different rock formations of the Salt Range area of Pakistan were tested to evaluate the
correlations between the uniaxial compressive strength and the corresponding values of the point
load index. Two hundred rock cores were drilled and used for the uniaxial compressive strength
and point load index tests. Results indicate the existence of two rock groups showing distinct
behaviour in the context of this correlation. The first group of rocks, Group A, consists of hard
Jutana Sandstone, Baghanwala Sandstone, Siltstone, Sakessar Massive Limestone, Khewra
Sandstone and Dolomite. The second group of rocks, Group B, consists of relatively soft Dandot
Sandstone, Sakessar Nodular Limestone and Marl. The correlation equations for predicting
compressive strength using point load index for each group are presented along with their
confidence limits to show the variability of results produced from each equation.
M. Akram, M. Z. A. Bakar. (2007) Correlation between Uniaxial Compressive Strength and Point Load Index for Salt-Range Rocks, Pakistan Journal of Engineering and Applied Sciences, Volume 1, Issue 1.
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