Optimizing the load on powered support during intensity fluctuations of rock pressure manifestations
Hennadii Symanovych1, Galyna Starushenko1, Serhii Minieiev2, Ivan Sheka1, Roman Halkov1, Ivan Vivcharenko1
1Dnipro University of Technology, Dnipro, Ukraine
2M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Dnipro, Ukraine
Min. miner. depos. 2026, 20(2):122-135
https://doi.org/10.33271/mining20.02.122
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      ABSTRACT
      Purpose. The research aims to identify the peculiarities of rock shear in the coal-overlaying formation in the mining-geological conditions of Western Donbas and to substantiate the mechanism of loading the stope complex support during fluctuations in the intensity of rock pressure manifestations.
      Methods. The research was based on an analysis of the mining-geological conditions of the extraction site, the collection and statistical processing of long-term data on the rock mass state, and mine monitoring of pressure in the hydraulic prop stays of powered support sections under different technological parameters of stoping face operation. Graphical and comparative analyses were used to assess the influence of roof rock texture, deformation and strength characteristics, rheological properties, stoping face advance velocity, and stoppage duration on the load acting on the powered support.
      Findings. Analysis of existing ideas about the deformation processes of roof rocks in the area of the stope face has enabled the development of a scheme for coal-overlaying formation shear. A mechanism of loading the powered support has been developed, taking into account geomechanical and technological factors. Qualitative patterns of the influence of parameters on the load of powered support have been obtained in the context of a system planning tool for research in mine conditions.
      Originality. The patterns of the influence of the texture and mechanical characteristics of roof rocks, including their rheological properties, have been identified; stope face advance velocity, time of its stoppage, step of the main roof settlement and the bearing reaction of support on the mechanism of the coal-overlaying formation shear.
      Practical implications. The established relationships between the pressure in powered support hydraulic prop stays, the longwall face advance velocity, roof rock texture, main roof caving step, and face stoppage duration can be used to adjust the operating parameters of powered support and stope operations. This makes it possible to identify potentially hazardous loading conditions, select a rational face advance rate, and reduce the risk of powered support overloading during main roof settlement and prolonged longwall stoppages.
      Keywords: coal; geomechanics; rock pressure; powered support; optimization
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