Improving a technique to calculate strength of cylindrical rock samples in terms of uniaxial compression

Leonid Vasyliev¹, Mykola Malich², Dmytro Vasyliev¹, Volodymyr Katan³, Zahar Rizo¹

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine

²Ukrainian State University of Science and Technology, Dnipro, Ukraine

³Oles Honchar Dnipro National University, Dnipro, Ukraine

Min. miner. depos. 2023, 17(1):43-50

https://doi.org/10.33271/mining17.01.043

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ABSTRACT

Purpose is to improve analytical technique to calculate strength of cylindrical rock samples taking into consideration standard horizontal stresses.

Methods. Mathematical modeling of cylindrical rock sample breakage under the truncated-wedge destruction was performed taking into consideration the standard horizontal stresses using four experimental characteristics (i.e. k being shear strength; f_с and μ being contact and internal friction coefficients; and Е being elasticity modulus) as well as comparing the design strength with experimental data obtained in the process of uniaxial compression.

Findings. The technique makes it possible to identify both maximum strength and residual strength of cylindrical rock samples using four indicators of properties which can be simply defined by experiment. Comparison of the analytical strength limits and experimental data, obtained in terms of uniaxial compression, supports the idea of high efficiency of the proposed technique.

Originality. For the first time, analytical modeling of cylindrical rock sample breakage has been performed in terms of the truncated-wedge destruction taking into consideration the standard horizontal stresses as well as contact and internal friction parameters.

Practical implications. The technique advantage is to apply promptly the calculation results in the context of industrial enterprises since their environment helps apply simple procedures to define indices of physiсomechanical characteristics of rocks for determination of stability of underground structures and reduction of energy consumption while disintegrating in open pits and mining and processing complexes.

Keywords: rock, strength, breakage, crack, stress, uniaxial compression

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