The publication describes the problem of transcendental deformation mode of interchamber pillar and ore deposit associated with the formation of hazardous zones in the rock mass in process of development of rockburst-hazardous rock masses at the great depth. Geomechanical software PRESS 3D URAL is used to assess the impact of the range of geological and technological factors on the mode of interchamber pillars deformation and ore deposit. The software allows to solve spatial problems in the elastic-plastic formulation. The results of step-by-step modeling of different mining and technical situations with a test of the bearing capacity of interchamber pillars showed that some of them can’t withstand the mountain pressure and go to the transcendental mode of deformation with subsequent destruction. Identification of the destroyed pillars allows to adjust the boundary conditions of loading the ore mass. At the same time the neglect of transcendental mode of deformation of interchamber pillars can lead to an undervaluation of the stress level in the ore mass by 1.5 or more times. This can lead to an error in predicting the parameters of zones dangerous due to rock bumps.
The key trend in the aluminum sector sustainability is efficient replenishment of mineral resources and reserves at preservation of mining safety and environmental standards. The production framework for the sustainable development is mineral processing feedstock and effective and balanced processing. The economic condition for the sustainable development of mining-and-metallurgical holdings is efficient technical-and-economic Value Added Chains. The social factors of the sustainable development are safety of operation and competitive salary, as well as favorable effect on social modernization in the mining business territory. The ecological factors of the aluminum sector sustainability are minimized air emissions and efficient mining waste management. Complex geological, geomechanical and geodynamic conditions in Severouralsk bauxite fields govern the engineering decision-making difficulty, including production safety. The methods to determine parameters of hazardous zone are justified, and the results of destressing drilling toward rockburst hazard reduction at different depths of mining are presented. It is shown that material expenses connected with production safety increase, and inclusion of these expenses in tax deduction from the mineral tax is validated. This approach converts fiscal policy of the mineral taxation into renting, and represents a component of the sustainable development of a mining-and-metallurgical holding, the sector and the national economy. The study was supported by the Russian Foundation for Basic Research and by the Ministry of Education, Culture, Science and Sports of Mongolia, Project No. 19-510-44013\19.
The publication examines the problems of concentrator of elevated tension formation in pillars and ore massif. The article presents the results of modeling the stress state of interchamber pillars and ore deposits, using specialized geomechanical software PRESS 3D URAL. In the process of numerical experiments, it was found that the increase of natural flexibility in pillars leads to a decrease of normal stresses in comparison with the variant of a stiff scheme. If interchamber pillar involves different varieties of ores, there is a redistribution of stress on the site with more stiff ores. The article shows that the stress state control of interchamber pillars and ore massif in conditions of OJSC «Sevuralboxitruda» can be achieved by drilling relief holes.
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