Correlation of Schmidt Hammer Rebound Number and Point Load Index with Compressive Strength of Sedimentary, Igneous and Metamorphic Rocks
N. Abbas1, K. Li2, N. Abbas1, R. Ali1
1Karakoram International University Gilgit, Gilgit, Pakistan
2Kunming University of Science and Technology, Kunming, China
Keywords: Uniaxial compressive strength, point load index, Schmidt hammer, rock types, correlation
Abstract
To predict uniaxial compressive strength using the indirect techniques of the Schmidt hammer rebound number (N) and Point Load Index (PLI), it is required to have valid empirical equations based on rock types. This study is an attempt to address this issue by developing a model that is valid for various rock types. Three models, i.e. linear, power and quadratic, were tested on each rock type (sedimentary, ingenious and metamorphic). The highest correlation was achieved by the quadratic model. The generalized model showed the lowest correlation as against the individual models.
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