Authors: A.S. Liskovets, V.P. Tatsienko, I.A. Ermakova

Title of the article: Application of finite element method for calculation of mine working with plugging layer behind arch support

Year: 2025, Issue: 6, Pages: 84-93

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.2

DOI: 10.26730/1999-4125-2025-6-84-93

Abstract: When using an arched metal frame support, it becomes necessary to install frame fences. One of the promising ways to fill voids behind the frame (arched) support and create an interframe fence, as well as ensure full contact of the support with the rock mass, is to create a grouting layer behind the support. The existing methods of analytical calculations of the stress-strain state (SSS) of mining operations consider simplified problem statements: the workings have a circular or elliptical shape, the rock mass is represented by a homogeneous and isotropic medium. It is proposed to use the finite element method to fully take into account the mining and geological conditions of mining, as well as the presence of a grouting layer. The work investigated the SSS of a preparatory mine, fixed with an arched support with a grouting layer behind the support. The design area in the flat cross-section of the mine working includes a coal seam, rock layers, an arched support and a grouting layer. The boundary conditions and loading conditions of the computational domain are substantiated. A grid of finite elements and their number is selected, which makes it possible to calculate the stress state of rocks, supports and grouting layer with an error of less than 1%. The assessment of the strength of rock layers, coal seam, grouting layer and support was carried out according to the Mohr criterion, on the basis of which the softening zones were identified. The results obtained make it possible to establish the load on the support for its full calculation, as well as to determine the necessary uniaxial compressive strength of the grouting layer to maintain its strength.

Key words: arch support grouting layer pressure on support finite element method

Receiving date: 14.05.2025

Approval date: 15.11.2025

Publication date: 22.12.2025

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