Interplay of strengths of nonuniformities in coal seams

The current calculation procedures of optimal parameters of coal mining machines and their cutting tools use the coal strength criterion of coal cuttability which is intrinsically a weighted mean of cuttabilities of coal and dirt bands, and neglects large solid inclusions contained in coal, while they drastically affect the dynamic stress and serviceability of mining machinery. Researches show that a more exhaustive estimation of strength and dynamic behavior of structurally complex coal seam is possible using the proposed index of the dynamic cuttability of coal. Geological descriptions of nonuniformities contained in coal seams use, as a rule, the value of the hardness f on Protodyakonov’s scale and the ultimate compression strength σ com. The authors offer the empirical relations for the transition from these values to the cuttability criterion used in the current procedure of coal mining machine design. It is recommended to use the proposed relations in optimization designs of coal mining machines.

Keywords: coal seam, cuttability, solid inclusions, dirt bands, hardness, coal mining machine, parameter selection, dynamic stress.
For citation:

Linnik Yu. N., Linnik V. Yu., Zhabin A. B., Zich A. Interplay of strengths of nonuniformities in coal seams. MIAB. Mining Inf. Anal. Bull. 2023;(3):5-15. [In Russ]. DOI: 10.25018/0236_1493_2023_3_0_5.

Issue number: 3
Year: 2023
Page number: 5-15
ISBN: 0236-1493
UDK: 622.023.23
DOI: 10.25018/0236_1493_2023_3_0_5
Article receipt date: 06.09.2021
Date of review receipt: 18.01.2023
Date of the editorial board′s decision on the article′s publishing: 10.02.2023
About authors:

Yu.N. Linnik1, Dr. Sci. (Eng.), Professor,
V.Yu. Linnik1, Dr. Sci. (Econ.), Assistant Professor, Professor, e-mail:,
A.B. Zhabin, Dr. Sci. (Eng.), Professor, Tula State University, 300012, Tula, Russia, Full Member of Academy of Mining Sciences,
A. Zich, Dr. Sci. (Eng.), Energy and Environmental Management Representative, Ontex Hygieneartikel, Germany, Grospostwitz,
1 State University of Management, 109542, Moscow, Russia.


For contacts:

V.Yu. Linnik, e-mail:


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