Secondary stress evolution in frame structure mines

The process of the secondary stress field formation in thick orebody mining using a frame mine structure is described as a case-study of a unit extraction block. For the variation valuation of the initial stress field in the course of mining, the authors introduce new indexes – the influence coefficient and the rock mass stability rating. Numerical modeling, with the model adjustment per stages of the frame mine structure construction, determines the initial stress field variation ranges, the geometric outlines of the tensile strain zones and the boundaries of rock mass areas where the first fractures are recorded and grow up to the boundaries of stoping. It is found that the highest effect on the secondary stress field and on the size of the initiated tensile strain zones is exerted by stoping, while backfilling brings the adjacent rock mass back to its initial condition. The best coefficients of influence in terms of enclosing rock mass stability are obtained after backfilling. The proposed approach enables efficient stress–strain assessment of rock mass affected by stoping using different mining systems, including the novel frame structures and honeycomb structures of mines, and allows structural optimization of mines at the stage of mine planning and design.

Umarov A. R., Eremenko V. A. Secondary stress evolution in frame structure mines. MIAB. Mining Inf. Anal. Bull. 2023;(4):77-92.[InRuss]. DOI: 10.25018/0236_1493_2023_ 4_0_77.

A.R. Umarov¹, Graduate Student, e-mail: flek1231998@mail.ru,
V.A. Eremenko¹, Dr. Sci. (Eng.), Professor, Director of Research Center for Applied Geomechanics and Convergent Technologies in Mining, Professor at Department of Physical Processes in Mining and Geocontrol, e-mail: prof.eremenko@gmail.com, 
¹ Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

V.A. Eremenko, e-mail: prof.eremenko@gmail.com.

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