Size effect on rock strength

The article reviews the studies into the uniaxial compressive strength of different-size rock samples and analyzes some major theories of impact exerted by size effect on the strength limit. Numerous researches disclose different laws of this phenomenon. As rock samples grow in size, their strength can decrease, increase, remain the same or alternate. In order to add the available knowledge, we carried out experiments on estimation of the size effect in sedimentary, metamorphic and magmatic rock samples made as cubes 20×20×20 mm to 60×60×60 mm in size. The influence of alternate freezing and thawing on the strength limit was studied for 21 types of rocks with regard to their average dry density. We also tested strength of samples cut out from different height-wise zones in the same laminated layer of Myachkovo limestone. The influence of lamination and strength nonuniformity is tested depending on the direction of the compressive load applied. Using the obtained results with a view to improving accuracy of testing, the recommendations on the sizes and number of samples are given in accordance with state standard GOST 30629-2011. It is concluded that the obtained results on strength of rock samples are applicable to estimating strength properties in rock mass.

Keywords: size effect (scale), uniaxial compression, rock strength, rock sample size, frost resistance, rock tests, rock mass structure, laminations, strength anisotropy.
For citation:

Suprun V. I., Levchenko Ya. V., Kolotovkin A. S., Voroshilin K. S. Size effect on rock strength. MIAB. Mining Inf. Anal. Bull. 2023;(10):5-19. [In Russ]. DOI: 10.25018/ 0236_1493_2023_10_0_5.

Issue number: 10
Year: 2023
Page number: 5-19
ISBN: 0236-1493
UDK: 620.173+622.023
DOI: 10.25018/0236_1493_2023_10_0_5
Article receipt date: 02.03.2023
Date of review receipt: 05.06.2023
Date of the editorial board′s decision on the article′s publishing: 10.09.2023
About authors:

V.I. Suprun1, Dr. Sci. (Eng.), Director PEC of NUST «MISIS», e-mail:, ORCID ID: 0000-0003-4585-8003,
Ya.V. Levchenko1, Cand. Sci. (Eng.), Assistant Professor, e-mail:, ORCID ID: 0000-0002-2080-6330,
A.S. Kolotovkin1, Graduate Student, e-mail:,
K.S. Voroshilin1, Senior Lecturer, e-mail:,
1 Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.


For contacts:

Ya.V. Levchenko, e-mail:


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