Integrated effect of size on ultimate compressive strength of rock samples

The ultimate compressive strength is a key physical property of rocks and is included in various designs and procedures. Despite general similarity of approaches to experimental determination of this value, there are yet some differences. This study reviews the current methods of rock compression testing in use in Russia and abroad. The foreign techniques conform with the first test variant of the Russian State Standard. At the same time, the differences lie in recommended geometrical parameters of test samples. The logarithmic function-based expression is obtained for determining an influence factor of difference between the actual height/diameter ratio of a rock sample in compression and the reference state standard-set value (2 to 1). Another exponential function-based expression determines an influence factor of deviation of a sample diameter from the reference value (42 mm). These expressions are used to derive a dependence integrating the effects of the sample diameter deviation and its height/diameter deviation from the reference parameters. The application of the dependence is illustrated. These results may be of use to experts engaged in foreign engineering projects.

Keywords: rocks, ultimate compressive strength, test methods, size effect, sample geometry factor, calculated dependences, correction factor, harmonization of engineering standards.
For citation:

Zhabin A. B., Polyakov A. V., Averin E. A., Linnik Yu. N., Linnik V. Yu. Integrated effect of size on ultimate compressive strength of rock samples. MIAB. Mining Inf. Anal. Bull. 2022;(8):5-13. [In Russ]. DOI: 10.25018/0236_1493_2022_8_0_5.

Issue number: 8
Year: 2022
Page number: 5-13
ISBN: 0236-1493
UDK: 622.023.23
DOI: 10.25018/0236_1493_2022_8_0_5
Article receipt date: 10.03.2022
Date of review receipt: 18.03.2022
Date of the editorial board′s decision on the article′s publishing: 10.07.2022
About authors:

A.B. Zhabin, Dr. Sci. (Eng.), Professor, e-mail:, Tula State University, 300012, Tula, Russia,
A.V. Polyakov, Dr. Sci. (Eng.), Engineer-Expert, LLC «Expertise of Industrial Safety», 300000, Tula, Russia, e-mail:,
E.A. Averin, Cand. Sci. (Eng.), Engineer-Designer, LLC «Skyratovsky Experimental Plant», 300911, Tula, Russia, e-mail:,
Yu.N. Linnik1, Dr. Sci. (Eng.), Professor, e-mail:,
V.Yu. Linnik1, Dr. Sci. (Econ.), Professor, e-mail:,
1 State University of Management, 109542, Moscow, Russia.

For contacts:

A.V. Polyakov, e-mail:


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