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Modelling blast induced damage from a fully coupled explosive charge.

Authors
Onederra-IA; Furtney-JK; Sellers-E; Iverson-S
Source
Int J Rock Mech Min Sci 2013 Feb; 58(1):73-84
NIOSHTIC No.
20041872
Abstract
This paper presents one of the latest developments in the blasting engineering modelling field-the Hybrid Stress Blasting Model (HSBM). HSBM includes a rock breakage engine to model detonation, wave propagation, rock fragmentation, and muck pile formation. Results from two controlled blasting experiments were used to evaluate the code's ability to predict the extent of damage. Results indicate that the code is capable of adequately predicting both the extent and shape of the damage zone associated with the influence of point-of-initiation and free-face boundary conditions. Radial fractures extending towards a free face are apparent in the modelling output and matched those mapped after the experiment. In the stage 2 validation experiment, the maximum extent of visible damage was of the order of 1.45 m for the fully coupled 38-mm emulsion charge. Peak radial velocities were predicted within a relative difference of only 1.59% at the nearest history point at 0.3 m from the explosive charge. Discrepancies were larger further away from the charge, with relative differences of -22.4% and -42.9% at distances of 0.46 m and 0.61 m, respectively, meaning that the model overestimated particle velocities at these distances. This attenuation deficiency in the modelling produced an overestimation of the damage zone at the corner of the block due to excessive stress reflections. The extent of visible damage in the immediate vicinity of the blasthole adequately matched the measurements.
Keywords
Blasting-agents; Engineering; Models; Explosion; Rock-mechanics; Analytical-processes; Author Keywords: Blast damage; Blast modelling; Damage modelling; Blasting; Rock breakage; Rock; Fragmentation
Contact
Italo A. Onederra, The University of Queensland, WH Bryan Mining and Geology Research Centre, Australia
CODEN
IJRMA2
Publication Date
20130201
Document Type
Journal Article
Email Address
i.onederra@uq.edu.au
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
B20121218D
Issue of Publication
1
ISSN
1365-1609
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
International Journal of Rock Mechanics and Mining Sciences
State
MN; WA
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