Electromagnetic Emission in Rocks under Large-Scale Basting
A. A. BESPAL’KOA1, L. V. YAVOROVICHA1, A. A. EREMENKOB2, V. A. SHTIRTSC3
1National Research Tomsk Polytechnic University, Tomsk 634050 Russia
2Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
3EVRAZRUDA, Tashtagol, Russia
Keywords: электромагнитная эмиссия, горная порода, взрыв, месторождение, амплитуда, трение, electromagnetic emission, rock, blast, deposit, amplitude, friction
Abstract
Physical modeling of electromagnetic response of rock mass to low-energy impacts in terms of the Tashtagol iron ore deposit shows that multiple low-energy series of impacts initially increase the amplitudes of electromagnetic signals which later on decrease to the same level. This circumstance is indicative of the fact that the slowly varying levels of electromagnetic signals recorded after large-scale blasts are conditioned by the rock mass movement along various slip planes. The change in the stress-strain state of rocks is a slow process which takes from units to tens of hours.
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