Abstract
The authors examine the blast action near free surface in brittle solid rocks, where fracture takes shape of crack development. The calculation model of kinematics of cracks initiated from the explosion center and extending onto free surface is worked out based on the linear brittle failure theory. To simplify the problem, cracks are assumed axially symmetric. The calculations involved specific parameters of a medium, charge and its installation depth. The calculations allow the shapes of cracks and their size-to-time relation, as well as the size and shape of explosion crater under the concentrated charge blasting near free surface.
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Original Russian Text © E.N. Sher, A.M. Mokhailov, A.G. Chernikov, 2011, Published In Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, 2011, No. 6, pp. 35–42.
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Sher, E.N., Mikhailov, A.M. & Chernikov, A.G. Brittle failure zone size under the concentrated charge blasting near free surface. J Min Sci 47, 734–740 (2011). https://doi.org/10.1134/S1062739147060050
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DOI: https://doi.org/10.1134/S1062739147060050