Gas pressurisation of blast-induced conical cracks

Post-blast observations of fracture networks in rock and PMMA indicate two predominant fracture types, namely wedge- and cone-shaped fractures. Fracturing occurs due to stress waves and pressurisation by detonation gases, where generally the gas pressure is the dominant fracture driving mechanism. P...

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Bibliographic Details
Published inInternational journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 34; no. 3-4; pp. 263.e1 - 263.e17
Main Authors Daehnke, A., Rossmanith, H.P., Napier, J.A.L.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.04.1997
Subjects
Blast-Induced Fracturing
Blasting
Conical Cracks
Dynamic Fracture Propagation
Fracture
Gas Pressure
Dynamic Fracture Propagation
Blast-Induced Fracturing
Fracture
Conical Cracks
Gas Pressure
Blasting
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Summary:Post-blast observations of fracture networks in rock and PMMA indicate two predominant fracture types, namely wedge- and cone-shaped fractures. Fracturing occurs due to stress waves and pressurisation by detonation gases, where generally the gas pressure is the dominant fracture driving mechanism. Previously gas-driven wedge- and penny-shaped cracks were analysed by analytical/numerical methods, and in this study the method is extended to allow the analysis of gas-driven conical cracks. The modified model is verified by back-analysing a laboratory experiment and good agreement between the numerical and experimental data is observed. For a given explosive charge, conical cracks are found to propagate further than penny-shaped cracks, and it is recognised that the conical geometry appreciably influences fracture growth.
ISSN:1365-1609
1873-4545
DOI:10.1016/S1365-1609(97)00282-7