Authors: K.Kh. Li, A.I. Fomin

Title of the article: Mathematical modeling of the physical state of a coal seam around a mining mine during degassing

Year: 2026, Issue: 2, Pages: 124-133

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

Index UDK: 622.453; 622.411.33;622.831

DOI: 10.26730/1999-4125-2026-2-124-133

Abstract: In this article, the authors consider options for the mechanical and gas-dynamic interaction of a degassing well with a coal mass. Modeling of gas filtration through the space of a gas-filled coal deposit at stress concentrators is based on phenomenological physico-mechanical concepts of the structure of the array. The gas-bearing massif is considered as a kind of continuous medium with uniform or partially uniform distributed mechanical and gas-dynamic properties. Criteria for estimating the extent of the zones of influence of the well on the coal massif are proposed. From the natural state of the well-mass system, the effects of the well's influence on the natural state of the gas-free mass and the gas-filled mass before and during its degassing have been identified and studied. Numerical modeling of the mechanical and gas-dynamic interaction between the mass and the well shows the dependence of the well's influence zone on the mass from the time of degassing. At the same time, the length of the influence zone boundary during the massif degassing for 180 days is 3.6 of the well diameter, while before the start of degassing, the length of the influence zone is 1.4 of the well diameter. The conducted scientific research has established that the increase in the stress state of the massif near the well due to the decrease in the supporting effect of the reservoir gas pressure is one of the reasons for the increase in the influence zone of the well on the coal massif over time. The mathematical modeling of the physical state of the coal seam around the mine workings during degassing proposed by the authors allows for prompt multi-variant numerical studies of the time-varying profiles of gas reservoir pressure and stresses in the gas-bearing coal mass disturbed by structural elements. Due to the variety of mechanical, gas-dynamic, and geometric parameters of the well and the coal mass, the conducted studies indicate the need to solve a multi-parameter problem about the influence of the degassing well on the coal-bearing massif.

Key words: modeling coal seam degassing filtration sorption pressure reservoir pressure stress state piezoelectric conductivity of the array

Receiving date: 17.11.2025

Approval date: 15.05.2026

Publication date: 29.06.2026

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