Effect of Discontinuity Orientation on the Success of Pre-Split Blasting


Konya, Calvin J.


Previous approaches to pre-split blasting theory have tended to concentrate on the mathematics of dynamic stress wave interaction, while only recognizing some interaction with quasi-static stresses induced by expanding gases in the boreholes. However, the decoupling used in pre-splitting is specifically designed to reduce dynamic effects to a level that a small degree of radial fracturing is created around the borehole which is emphasized and extended by quasi-static gas effects. It can thus be argued that the process has more in common with hydrofracture than with more conventional use of explosives. A research program was designed to test a simple analytical approach to pre-split blasting through an extensive model blasting program incorporating the use of both idealized material and rock, and an equally extensive field observation program and trials on pre-split highway cuts in Scotland. Conclusions from the work are given.

Meeting Name

Proceedings of the Tenth Conference on Explosives and Blasting Technique.


Mining Engineering

Document Type

Article - Conference proceedings

Document Version


File Type





© 1984 International Society of Explosives Engineers (ISEE), All rights reserved.

Publication Date

01 Jan 1984

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