Impact of Blasting in Neighborhood of Roadways and Stopes in Rockburst-Hazardous Conditions in the Altai-Sayan Mountainous Region
A. A. Eremenko1, V. A. Eremenko2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2National University of Science and Technology-NUST MISIS, Moscow, Russia
Keywords: Deposit, fault, stress-strain behavior, blast, roadway, stope, rock, geodynamic phenomena, damaged rock zones
Abstract
The geology and geomechanics of the Altai-Sayan Mountainous Region are studied. Deep faults are identified, displacements along which activate seismicity in neighborhood of the rock-burst hazardous Tashtagol and Sheregesh deposits. The influence of large-scale mining operations on the intensity of geodynamic phenomena at great depths is studied. The patterns of earthquakes in the vicinity of the test deposits are examined. The energy classes of blasts (2.5-8.0) and geodynamic phenomena (2.0-6.5), as well as their magnitudes (1.5-2.9) are determined. The scope of the study embraced the influence of blasting on the formation of zones of rock disintegration (I), induced jointing (II) and micro-jointing (III). It is found that the maximal sizes of zones I-III during heading operations are, respectively, 0.48, 1.68 and 4.44 m; these values in blasting using grammonite M21 and an emulsion explosion are, respectively, 2.19 (1.9), 3.84 (3.33) and 15.34 (13.64) m. Using the microseismicity method, the location of the nearest concentration zones of shocks with a seismic energy of 2·102-107 J in the mine field during blasting in roadways and stopes at a distance of 3.33-15.34 m is determined.
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