Wave Pre-Destruction of Solid Rocks under Blasting
A. N. KOCHANOV, V. N. ODINTSEV
Institute of Integrated Mineral Development-IPKON, Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 111020 Russia
Keywords: горная порода, камуфлетный взрыв, упругая волна, растяжение породы, микротрещины, волновое предразрушение, скорость детонации, rock, confined explosion, elastic wave, tension, microcracks, wave pre-destruction, detonation velocity
Abstract
Considering features of wave pre-destruction (microfailure) of rocks under blasting, the authors put forward a new investigation approach with the use of relations of dynamic elastic stress distribution in rocks and theory of cracks. The obtained relation to estimate pre-destruction zone size in relatively solid rocks under confined explosion involves pressure of gases in explosion chamber, rock pressure, crack resistance of rocks, characteristic dimension of natural jointing (presence of defects) and deformation characteristics of rocks. It is shown that dimension of pre-destruction zone in rocks depends both on natural and production factors and can differ by a few times.
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