Mining of Mineral Deposits

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Generalization of trends in the influence of geomechanics factors on the choice of operation modes for the fastening system in the preparatory mine workings

I. Kovalevska1, M. Zhuravkov2, V. Chervatiuk3, O. Husiev4, V. Snihur5

1Dnipro University of Technology, Dnipro, Ukraine

2Belarusian State University, Minsk, Belarus

3LLC “DTEK Energy”, Kyiv, Ukraine

4MM “Dniprovske”, PJSC “DTEK Pavlohradvuhillia”, Pavlohrad, Ukraine

5MM “Heroiv Kosmosu”, PJSC “DTEK Pavlohradvuhillia”, Pavlohrad, Ukraine

Min. miner. depos. 2019, 13(3):1-11

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      Purpose. Substantiation of the mechanism of loading the preparatory mine working support to optimize its deformation-strength characteristics based on the calculation of the stress-strain state of the “massif – support” system. Improving the cost effective technologies for fastening and maintaining the preparatory mine workings.

      Methods. The analysis of the elements interaction modes of the “massif – support” system has been performed by the two-parameter diagram for optimizing the deformation-strength characteristics of the rock massif and the preparatory mine workings support using the research results of the stress-strain state of a system by means of finite element method. A comparison has been made of computational experiment with mine instrumental observations.

      Findings. The geomechanical model of the computational experiment on the choice of operation modes of the fastening system, as well as the methodology of the approach to optimize the process of interaction between the massif and the support have been substantiated. The analysis of search patterns for the rational deformation-strength characteristics of the fastening system in the preparatory mine working, taking into account the influence of the main geomechanics factors on this process, has been developed and performed.

      Originality.The patterns have been established of the geomechanics factors influence on the choice of rational operation modes of the load-bearing elements of the fastening system and the support in general based on research of the stress-strain state of the “massif – support” system. The optimization principles of interaction based on the analysis of a two-parameter interaction diagram have been substantiated.

      Practical implications. The wide perspective has been substantiated for strengthening the soft rocks in reusable preparatory mine workings with combined roof-bolting systems, which makes possible to realise the resource-saving conditions of maintenance. The calculations have been made with account of the optimization criteria for interaction of massif and support.

      Keywords: rock massif, preparatory mine working, support, deformation, loading, stability, geomechanics factors


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