STABILITY LOSS IN AN EXTENDED CYLINDRICAL WORKING BEYOND THE ELASTIC LIMIT
A.I. Chanyshev1,2, O.E. Belousova1, O.A. Lykyashko1
1Chinakal Institute of Mining Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University of Economics and Management, Novosibirsk, Russia
Keywords: Cylindrical working, axisymmetric deformation, stability criterion, Leibenson - Ishlinsky, critical load
Abstract
In the axisymmetric case of Leibenson - Ishlinsky formulation, the problem of stability loss in a mine working with initial circular cylindrical shape is solved. It is assumed that at the moment of stability loss bulges are formed, facing the inside of the mined-out space. The rock mass around the mine working is considered in one of three states: elastic, elastoplastic and post-limiting deformation. The critical load depending on the length of working, radius and physical/mechanical rock properties is determined.
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