DEVELOPMENT OF METHODS FOR PREVENTING GEODYNAMIC PHENOMENA IN ROCKBURST-HAZARDOUS DEPOSITS
E. A. Khristolyubov1, A. A. Eremenko2, V. N. Filippov2
1Mine Sheregesh, JSC “Evraz ZSMK”, Sheregesh, Russia
2Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Mine fields, stress-strain state of the rock mass, inelastic deformation zone, relief holes, rock ledge decompaction
Abstract
When assessing the stress-strain state of the rock mass of a ledge of the Sheregesh deposit, it was found that zones of inelastic deformation are formed near the mined-out spaces in the southwestern part of the pillar. It is shown that location of the relief holes at elevation +195 m, providing decompaction of the rock ledge in its peripheral regions, causes additional unloading of the rock mass. In this case, the compressive horizontal stresses in the boundary part of the ledge are reduced, the corresponding shear stresses comparable with the rock mass adhesion are reduced by 40 - 50 %, which leads to a decrease in inelastic deformations in the rock ledge.
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