Kalinichenko O. Scientific principles of controlling the stress-strain state of the massif in forming artificial underground structures

The work aims to develop scientific principles of controlling the stress-strain state of the massif through specifying regularities of stress field interaction when forming underground workings to enhance efficiency and safety of underground ore mining. The object of the research is processes of interaction of different module media when ore deposit stoping. The research methods involve use of the integrated investigation method including analysis and generalization of literature on geomechanics; the theory of experiment planning and physical modeling of the stress-strain state of the massif applying equivalent materials; analytical tools of the elasticity theory for determining values of maximum stresses in floor pillars, the finite elements method for determining daylight surface deformation values at ore deposit stoping; simulation modeling of ore drawing from stopes; experimental testing of the thesis results and their implementation into production. The scientific value of the work consists in developing scientific principles of controlling the stress-strain state of the massif when forming underground workings, determining regularities of daylight surface deformation depending on the mining depth, deposit dip angles, physical and mechanical properties of rocks and backfilling materials, stope crown shapes and artificial pillar structures which enable substantiation of parameters and development of efficient and safe mining technologies to prevent surface subsidence when applying underground mining methods. The practical value of the work consists in development of methodological recommendations “Selection and substantiation of stable crown shapes when mining iron ores at great depths” at the PrJSC “Sukha Balka”, “Selection and substantiation of stable crown shapes when mining iron ores at great depths at the deposit of Rodina underground mine of the PJSC Kryvbaszalizrudkom”; “Rules and regulations of determining safe and stable parameters of stopes at the underground mines of VostGOK”; application of the results by the State Enterprise “State Institute for Design of Mining Enterprises Kryvbasproekt” to develop mining projects for Kryvbas underground mines; the Enterprise Standard “Methods of calculating specific rates of consuming basic material resources at the underground mining complex VostGOK”; the Enterprise Standard “Rates of consuming basic material resources for underground mining operations at the underground mine group (as underground mines) of the mining department of ArcelorMittal Krivoy Rog”. The annual economic effect of implementing the technological solutions of the thesis at Kryvyi Rih basin mining enterprises will make 1314.714 thousand UAH.