Thermal Stress State in the Vicinity of Underground Roadways
V. M. Seryakov
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Mineral deposit, great depth, rocks, temperature, stress state, mined-out stope, backfill, mining sequence, calculations, initial stress state, stiffness matrix, mining stages
Abstract
The article addresses the problem on thermal stresses and stress-strain behavior of rock mass during deep-level mining. The author proposes an approach to determining the stationary field of temperatures in the zone of mining with cemented paste backfill with single formation of stiffness matrix in the calculation. It is found that inclusion of the temperature change depthward rock mass in the analysis results in the increase in the initial horizontal stresses while the initial vertical stresses remain unaltered. The calculation method of stress redistribution in the course of mining with backfill, with the same stiffness matrix used at all calculation stages, is modified for taking into account the thermal stresses. The calculation of the thermal stress state of surrounding rocks and backfill is carried out for a variant of mining with backfill in a gently dipping ore body.
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