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ArticleName Methods of uniaxial tension testing of rock samples with splitting: Comparison
DOI 10.17580/gzh.2024.03.09
ArticleAuthor Trofimov A. V., Fedoseev A. V., Kisel A. A., Ilchenko N. M.

Gipronickel Institute, Saint-Petersburg, Russia

A. V. Trofimov, Head, Geotechnique Laboratory, Candidate of Engineering Sciences
A. V. Fedoseev, Leading Researcher, Candidate of Engineering Sciences,
N. M. Ilchenko, Category I Engineer

NorNickel’s Polar Division, Norilsk, Russia

A. A. Kisel, Chief Engineer, Center for Geodynamic Safety


For the mines at the Oktyabrsky and Talnakh deposits, from the implemented geomechanical research, it is found that the stability of ore and rocks ranges widely, from extreme instability to stability. The lithological diversity also lays emphasis on the accuracy of strength characteristics. A generally accepted value to characterize the strength of rocks is the uniaxial compression strength. In the meanwhile, the tension strength is also a very important determinant of the physical and mechanical properties of rocks since the process of rock failure is, among other things, governed by the action of the tensile load, especially in mechanical and blast-induced loading. In view of the difficult nature of direct tension testing of rock samples, numerous tension tests of rocks were performed using different methods. The world practices use widely indirect tension testing under complex stress states when failure mode of test samples generally depends on the maximal tension component of the stress tensor. The comparative tests of uniaxial compression strength are carried out for lithologically various rocks from the Oktyabrsky and Talnakh deposits. The experimental estimation of the effect of the contact conditions at the loading point of the test samples in the indirect tension testing of rocks is carried out. The destructive load ratios are found for different contact conditions on identical test samples. The uniaxial tension strength coefficients are determined for application conditions of different loading surfaces.

keywords Rocks, physical and mechanical characteristics, stresses, sampling, tensile strength, Brazilian test, Hertz contact problem, tensile crack, contact condition, loading surface, high-speed video filming

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