Authors: A.V. Adamkov, Yu.V. Dmitrak, V.A. Atrushkevich, Yu.A. Lagunova

Title of the article: Analysis, evaluation and selection of rational technological options of rock mass fracturing during workings development at coal mines

Year: 2024, Issue: 3, Pages: 79-98

Branch of knowledge: 2.8.8 Mining machines, geotechnology (engineering)

Index UDK: 622.236

DOI: 10.26730/2618-7434-2024-3-79-98

Abstract: Domestic engineering practice defines the main direction of technical development of mining as complex mechanization in underground mining of mineral deposits, the basis of which is the technological process of fracturing of rock massif by combines. Due to the essential heterogeneity of the rock massif, its fracturing should be considered as a random process. In general case the structure of the fracture process (cutting of coal by a single tool) can be represented by a random sequence of elementary spalls, the stationarity of which occurrence is broken by the appearance of the areas of the leading edge and the areas of cutting through hard inclusions. The process of cutting coal is characterized by the occurrence of elementary chips of various shapes. According to a large number of oscillograms of coal cutting it is established that there is practically no connection between the parameters of neighboring spalls, and the appearance of advanced spalls and their duration are not related to the parameters of the preceding spalls. At the same time, it is shown that there is a mutual relationship between the parameters of a given spall, the laws of distribution of which are described by the gamma distribution. This article considers the mechanical destruction of the coal seam during preparation workings. The analysis and evaluation of works aimed at improving the mechanical method of destruction in the faces of preparatory workings are carried out, disadvantages inherent in the mechanical method of coal destruction in the preparatory face are given. The analysis and evaluation of works aimed at improving the mechanical method of fracturing in the faces of preparatory mine workings are performed, the disadvantages inherent in the mechanical method of coal fracturing in the preparatory face are given. The technological variant of coal seam fracturing by the method of «coarse chipping» in the preparatory workings is offered.

Key words: mechanical fracturing energy consumption of fracturing dust formation directions of improvement combined method of rock mass fracturing underground geotechnology

Receiving date: 30.07.2024

Approval date: 23.09.2024

Publication date: 05.12.2024

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