Effect of Mining Geometry on Natural Stress Field in Underground Ore Mining with Conventional and Nature-Like Technologies
V. A. Eremenko1, Yu. P. Galchenko2, M. A. Kosyreva1
1College of Mining, National University of Mining and Technology, Moscow, 119991 Russia
2Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, 111020 Russia
Keywords: Техногенно измененные недра, природоподобные горнотехнические системы, исходное и вторичное поле напряжений, система подземной разработки, каркасные и сотовые горные конструкции, микродеформации, скальный массив, коэффициент влияния, критерий прочности Хука - Брауна, категории устойчивости массива, Mining-altered subsoil, nature-like mining system, natural and induced stress field, underground mining system, frame and honeycomb mine structures, microstrains, rock mass, response factor, Hoek-Brown failure criterion, rock mass stability rating
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-response factor. 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 nature-like 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 response factor is a characteristic of the frame mine structure.
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