Study of regularities of manifestation of geomechanical processes in the maintenance of workings at the border with the mined-out space behind the lava
Исследование закономерностей проявления геомеханических процессов при поддержании выработок на границе с выработанным пространством позади лавы
Kainazarova A.S. Demin V.F. Kaynazarov A.S. Akhmatnurov D.R.
2025North Caucasian Institute of Mining and Metallurgy, State Technological University
Sustainable Development of Mountain Territories
2025#17Issue 31606 - 1613 pp.
Status. An analysis of scientific research shows that most existing work focuses on the stress-strain state of the rock mass near the working face. However, the issues of maintaining workings in the mined-out area behind the longwall, which is characterized by reduced rock mass bearing capacity, remain insufficiently studied. Purpose of the research. The purpose of this study is to substantiate the parameters of rock bolt support for mine workings located at the boundary with the goaf behind the longwall face. Materials and Methods. A scientific and engineering approach was applied to qualitatively assess the stability of the physical and mechanical properties of the rock mass during roadway maintenance. Numerical modeling was performed to determine the parameters of rock bolt and combined support systems under a longwall mining scheme with direct-flow ventilation for the conditions of the K7 coal seam at the Abayskaya mine of the Karaganda Coal Basin. Results. Numerical modeling was carried out to determine the parameters of rock bolt and combined support systems for a longwall panel length of 230 m prior to face advance, under conditions of both bolted and combined support. The study identified mining and technological factors that significantly affect roof displacements. The influence of these factors becomes noticeable when the roadway width exceeds 5 m and the height exceeds 3 m. Increasing the roadway width from 4 to 5 m leads to a 25–29 % increase in displacements, while increasing the height from 3.5 to 4.0 m results in a 15–20 % increase. With an increase in mining depth from 500 to 820 m in seams with a thickness of 1.6–5.5 m, deformations increase by a factor of 3.3 in rocks with uniaxial compressive strength σcom < 45 MPa and by 2.4 times in rocks with σcom = 45–80 MPa. The numerical assessment of the influence of mining and technological factors on the stress–strain state of rocks surrounding the roadway contour made it possible to establish empirical relationships between deformation parameters and operational conditions. Conclusions. The study evaluates the influence of mining and technological parameters on the stability of mine workings located at the boundary with the goaf at the Abayskaya mine of the Karaganda Coal Basin. The regularities of geomechanical process development during the maintenance of mine workings behind the longwall face were established, including an assessment of the influence of mining factors on the technological stability of exposed rock surfaces in operating roadways.
coal seam deposits , geomechanical pressure , goaf , support methods and systems , underground mining
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Mining Department, K. Satpayev Ekibastuz Engineering Technical Institute, 54A, Energetikov str., Ekibastuz, 141208, Kazakhstan
Department of Mineral Deposit Development, Abylkas Saginov Karaganda Technical University, 56, Nazarbaev str, Karaganda, 100027, Kazakhstan
Laboratory of Methane Energy, Abylkas Saginov Karaganda Technical University, 56, Nazarbaev str., Karaganda, 100027, Kazakhstan
Mining Department
Department of Mineral Deposit Development
Laboratory of Methane Energy
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