Determining the Correlation Between Uniaxıal Compressive Strength, Modulus of Elasticity and Point Load Strength Index of Rocks

Abstract

In order to classify rocks according to their strengths, point load strength index, uniaxial compressive strength and modulus of elasticity are the most commonly used parameters. They are used in geotechnical calculations very often and affect many calculations in the field of geotechnical engineering. Rock strength parameters are required for many important geotechnical calculations such as rock socket piles, rock stability analyses, tunnel analyses etc.

It is possible to determine these parameters with the tests performed on the samples obtained from the boreholes. However, the lack of sufficient samples, the condition of the rock structure, the quality of the machinery and equipment used do not make it possible to obtain these parameters directly in some cases. In this case, it is necessary to use correlations and make conversions between parameters.

Within the scope of this thesis, it is aimed to determine the correlation coefficients of the rocks belonging to certain formations in our country and to compare these values with the literature. There are significant numerical differences among the correlations in the literature. Within the scope of these thesis, the acceptable ranges for the specified parameters are presented graphically. Suggestions are given in the content of the thesis about the points to be considered in the use of correlations. It will be beneficial for geotechnical engineers to consider these suggestions for safer and more realistic designs.