Implementation of Smoothed Particle Hydrodynamics for Detonation of Explosive with Application to Rock Fragmentation

The paper presents a methodology in the SPH framework to analyze physical phenomena those occur in detonation process of an explosive. It mainly investigates the dynamic failure mechanism in surrounding brittle rock media under blast-induced stress wave and expansion of high pressure product gases....

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Bibliographic Details
Published in:Rock mechanics and rock engineering 2015-07, Vol.48 (4), p.1683-1698
Main Authors: Pramanik, R., Deb, D.
Format: Article
Language:English
Subjects:
Anisotropy
Blast holes
Civil Engineering
Density
Detonation
Earth and Environmental Science
Earth Sciences
Explosions
Explosives
Fluid mechanics
Fracture mechanics
Free surfaces
Geophysics/Geodesy
High pressure
Hydrodynamics
Mathematical models
Original Paper
Rock
Rocks
Simulation
Stress analysis
Stresses
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Summary:The paper presents a methodology in the SPH framework to analyze physical phenomena those occur in detonation process of an explosive. It mainly investigates the dynamic failure mechanism in surrounding brittle rock media under blast-induced stress wave and expansion of high pressure product gases. A program burn model is implemented along with JWL equation of state to simulate the reaction zone in between unreacted explosive and product gas. Numerical examples of detonation of one- and two-dimensional explosive slab have been carried out to investigate the effect of reaction zone in detonation process and outward dispersion of gaseous product. The results are compared with those obtained from existing solutions. A procedure is also developed in SPH framework to apply continuity conditions between gas and rock interface boundaries. The modified Grady–Kipp damage model for the onset of tensile yielding and Drucker–Prager model for shear failure are implemented for elasto-plastic analysis of rock medium. The results show that high compressive stress causes high crack density in the vicinity of blast hole. The major principal stress (tensile) is responsible for forming radial cracks from the blast hole. Spalling zones are also developed due to stress waves reflected from the free surfaces.
ISSN:0723-2632
1434-453X
DOI:10.1007/s00603-014-0657-y