Mining of Mineral Deposits

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Optimization of rational parameters for fastening and protection systems of mine workings in conditions of occurrence of unpredictable rock pressure manifestations

Hennadii Symanovych1, Vyacheslav Krasnyk2, Mykola Odnovol1, Maksym Snihur1, Ivan Sheka1

1Dnipro University of Technology, Dnipro, Ukraine

2SE “STC “Vuhleinnovatsiia”, Kyiv, Ukraine


Min. miner. depos. 2025, 19(2):107-120


https://doi.org/10.33271/mining19.02.107

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      ABSTRACT

      Purpose. To develop and substantiate rational parameters of a support and protective system for maintaining mine workings under conditions of potential unpredictable manifestations of rock pressure, ensuring the stability of the workings for their subsequent reuse after longwall face retreat.

      Methods. The study is based on geomechanical modeling within an elastic-plastic framework using a bilinear “stress-strain” diagram for each lithological unit and support element. Calculations were performed considering the actual physical and mechanical properties of the surrounding rock. The modeling included standard and combined support schemes involving cable bolts (6.0 m length) and steel-polymer bolts (2.8 m length), with the inclusion of additional support elements in the zone of potential secondary caving.

      Findings. The proposed combined support system comprising cable and steel-polymer bolts enabled the formation of a high-load-bearing reinforced rock plate. Comparative analysis of the stress-strain state (SSS) demonstrated a reduction in hazardous stress concentrations by 10-40%, and the affected areas decreased by a factor of 4.2-4.6. The recommended system effectively counteracts rock pressure even under unpredictable geotechnical conditions.

      Originality. For the first time, the correlation between the structural configuration of the combined bolting system and the spatial stress distribution in the rock mass has been substantiated, ensuring the transition from a frame-bearing to a rock-reinforced bearing structure. A methodology for selecting support parameters is proposed, considering the integrated influence of jointing, water saturation, and rock rheology.

      Practical implications. The obtained results allow for a significant improvement in the reliability and safety of mine workings in complex geotechnical conditions and facilitate their reuse with minimal repair costs.

      Keywords: coal, mine, rock pressure, mine workings, fastening system


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