Authors: Yu.N. Linnik, V.Yu. Linnik

Title of the article: Evaluation of rock and coal fracture processes: a methodological analysis for various loading regimes

Year: 2026, Issue: 3, Pages: 94-104

Branch of knowledge: 2.8.8. Geotechnology, Mining machines (engineering)

Index UDK: 622-1/-9, 622.023

DOI: 10.26730/1816-4528-2026-3-94-104

Abstract: One of the preconditions for the optimal performance and reliability of coal mining machinery is the correspondence of its design parameters to the physical and mechanical properties of the coal seams being extracted. Therefore, when solving tasks related to calculating the parameters and operating modes of mining machines, determining their rational application range, estimating face load, etc., an indicator is required that integrally accounts for the strength properties of coal seams. In this regard, for many years, various countries, including Russia, have conducted theoretical and experimental research to find methods and criteria for assessing the brittle fracture of various materials, including rocks and coals. This research has united specialists from many disciplines: solid-state physics; continuum mechanics; materials science; engineering design; etc. While acknowledging the undeniable contributions of predecessors in the field of brittle fracture, it should be noted that their obtained results and methods are of limited scope and cannot be fully applied to evaluating coal seams as objects destroyed by the cutters of mining machine toolheads. The accumulated knowledge in brittle fracture has allowed for the development of equipment, a method, and criteria for assessing coal seams in relation to selecting optimal parameters for coal mining machinery. The article reviews the primary methods for assessing brittle fracture proposed at various times by Russian and foreign scientists, which ultimately led to the development of a universally accepted indicator for the cuttability resistance of coal seams.

Key words: brittle failure cutting rock coal assessment method hardness strength petrographic-chemical properties energy indicators cuttability resistance

Receiving date: 19.02.2025

Approval date: 15.05.2025

Publication date: 04.06.2026

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