Effect of Mining Geometry on Natural Stress Field in Underground Ore Mining with Conventional and Nature-Like Technologi
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__________________________ MINERAL MINING ________________________________ TECHNOLOGY
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Effect of Mining Geometry on Natural Stress Field in Underground Ore Mining with Conventional and Nature-Like Technologies V. A. Eremenkoa*, Yu. P. Galchenkob, and M. A. Kosyrevaa a
College of Mining, National University of Mining and Technology–NUST MISIS, Moscow, 119991 Russia *e-mail: prof.eremenko@gmailcom b Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources–IPKON, Russian Academy of Sciences, Moscow, 111020 Russia Received April 28, 2020 Revised May 10, 2020 Accepted May 29, 2020 Abstract—The authors study the process of the induced stress field formation in mining with the conventional and nature-like geotechnical systems, including frame and honeycomb mine structures. The rate of change in the natural stress field during mining is estimated using a new index—coefficient of influence. Based on the data of experimental mine research, as well as physical and numerical models, with regard to the numerical model calibration, the diagram of influence exerted on the rate of change in the natural stress field by the geometry of stopes in underground ore mining with the conventional and naturelike geotechnologies is plotted. It is found that the highest effect on the size of the induced tensile strain zones is exerted by the mining systems with caving of ore and enclosing rocks. The optimum coefficient of influence is a characteristic of the frame mine structure. Keywords: Mining-altered subsoil, nature-like mining system, natural and induced stress field, underground mining system, frame and honeycomb mine structures, microstrains, rock mass, coefficient of influence, Hoek–Brown failure criterion, rock mass stability rating. DOI: 10.1134/S1062739120036702
The resource and energy base of the contemporary technocratic civilization is the substance extracted from the interior of the Earth during mineral mining. Geophysically, a mining process can be interpreted as a progressive formation of a system of inhomogeneities of zero or varied density in a solid rock mass. Geomechanically, this means that the anthropogenic alteration of the lithosphere induces a zone of secondary stresses in the natural stress field, and the outward boundary of the secondary stress zone delineates a new lithosphere object—manmade altered subsoil. Regarding the mining safety, the optimal scale of this object is governed in each particular case by the ability of the disturbed geophysical structure to localize the secondary stress zone and to entail it into the lithosphere evolution. The geomechanical safety of solid mineral mining is associated with the fundamental problem in geomechanics—disclosure of the mechanism of anthropogenic impact on the dynamic structure of the lithosphere.
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