Rock Fragmentation And Heave From Stoping Blastholes During Controlled Gas Penetration Tests

J. R. Brinkmann

doi:10.1117/12.975567

1 September 1987 Rock Fragmentation And Heave From Stoping Blastholes During Controlled Gas Penetration Tests

J. R. Brinkmann

Proceedings Volume 0674, 17th Intl Congress on High Speed Photography and Photonics; (1987) https://doi.org/10.1117/12.975567
Event: 17th International Conference on High Speed Photography and Photonics, 1986, Pretoria, South Africa

Abstract

Over the past 40 to 50 years numerous theories of rock breakage by explosives have evolved. These theories can be divided into two general categories depending on the relative importance ascribed to fracturing caused by gas expansion and stress wave energy sources. A major obstacle in the study of explosive rock breakage mechanisms is separation of affects from these two energy sources. A technique is under development which restricts by means of a blasthole liner, the penetration of explosive gas products into the rock mass surrounding the charge. Thus the character of stress waves developed in the rock is virtually identical to an unlined hole while the breaking action due to gas expansion is severely curtailed. This paper summarizes preliminary results from initial experiments using this technique to study the rock breakage mechanisms operative in gold mine stope blasting. Each experiment incorporated high speed photography and other instrumentation to observe and record the burden rock response to contrasting explosive loading conditions.

Citation Download Citation

J. R. Brinkmann "Rock Fragmentation And Heave From Stoping Blastholes During Controlled Gas Penetration Tests", Proc. SPIE 0674, 17th Intl Congress on High Speed Photography and Photonics, (1 September 1987); https://doi.org/10.1117/12.975567

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