Authors: B.A. Anfyorov, L.V. Kuznetsova

Title of the article: Management of the roof coal by its disintegration during the development of the coal seam by drawing it onto the face conveyor

Year: 2021, Issue: 4, Pages: 77-85

Branch of knowledge: 25.00.22 Geotechnology (underground, open and construction)s

Index UDK: 622.275

DOI: 10.26730/1999-4125-2021-4-77-85

Abstract: The urgency of the discussed issue. When developing a thick, flat seam with the release of coal from the under-roof layer to the face conveyor, the stability factor of the coal mass of the under-roof layer has a great influence on the efficiency of mining operations. With a weak, highly fractured coal, on the one hand, it is easier to separate from the roof, the hanging of coal decreases, and its self-collapse improves; on the other hand, the stability of the roof coal and coal face in the undercut layer decreases, which complicates the coal face operations.
The main aim of the study. Ensure the destruction of the under-roof massif directly above the outlet window of the support section due to the forces of rock pressure as the working face of the undercut layer moves up and the coal produced is captured without loss (cost) of time for performing additional technological operations.
The methods used in the study. Generalization and analysis of the conditions for the disintegration of the coal mass.
The results. Under the conditions of a constantly acting distributed load due to the mass of the under-roof layer, it is proposed to act on its lower part with alternating loads that provoke its destruction directly above the outlet window of each support section. It is proposed to influence the coal mass by overlapping the support sections, thereby providing compression of the ceiling coal, then to reduce the specific thrust force, instead of increasing repeatedly the tensile forces from the coal leading to its destruction. The early disintegration of the near-roof part of the under-roof massif provides partial degassing of the seam, its temporary unloading from the rock pressure, improves the separation of coal from the immediate roof, which together contributes to an increase in the safety and efficiency of the coal face operations.

Key words: disintegration under-roofing powered roof support coal produced specific thrust force

Receiving date: 16.04.2021

Publication date: 15.09.2021

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