Experimental study of change in physical and mechanical properties of anthracite under temperature exposure

The paper presents the experimental data of laboratory thermomechanical tests of anthracite specimens from the Gorlovsky Coal Basin (Novosibirsk Region). It is confirmed that the physical and mechanical properties of geomaterials undergo significant changes under conditions of higher temperature. The experimental results demonstrate a quite significant decrease in the ultimate uniaxial compressive strength σc and the static modulus of elasticity E of the anthracite samples. It is shown that anisotropy of mechanical properties accounts for differences in the temperature dependences of the strength characteristics and deformation behavior of the anthracite specimens subjected to heating. Consideration is given to such a fundamentally significant aspect of experimental geomechanics as the reliability of the results of laboratory tests of geomaterials. Importantly, our experimental investigation involved non-destructive laser ultrasonic diagnostics to qualitatively assess the degree of disturbances of the internal structure of anthracite specimens; subsequently some specimens were rejected («censored»). As a result, a statistically significant sample of specimens is created, having low variability in the physical and mechanical properties. Thus, it can be concluded that the efficiency of quantitative assessment of the strength characteristics and deformation behavior of geomaterials can be increased if both destructive and non-destructive (introscopic) methods are employed.

Keywords: geomaterials, anthracite, structure, anisotropy, stratification, physical and mechanical properties, laser-ultrasonic diagnostics, temperature effect, ultimate strength in uniaxial compression, elastic modulus.
For citation:

Ivanov P. N., Blokhin D. I., Zakorshmennyy I. M. Experimental study of change in physical and mechanical properties of anthracite under temperature exposure. MIAB. Mining Inf. Anal. Bull. 2021;(4-1):41—51. [In Russ]. DOI: 10.25018/0236_1493_2021_41_0_41.

Issue number: 4
Year: 2021
Page number: 41-51
ISBN: 0236-1493
UDK: 622.023.2+622.335
DOI: 10.25018/0236_1493_2021_41_0_41
Article receipt date: 20.01.2021
Date of review receipt: 15.02.2021
Date of the editorial board′s decision on the article′s publishing: 10.03.2021
About authors:

Ivanov P. N.1, PhD-student, pavelnivanov@mail.ru;
Blokhin D. I.1,2, Cand. Sci. (Eng.);
Zakorshmennyy I. M.2, Dr. Sci. (Eng.);
1 National Research Technological University «MISiS» , Moscow, Russia;
2 Institute of Comprehensive Exploitation of Mineral Resources Russian Academy of Sciences, Moscow, Russia.


For contacts:

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