Modelling fracturing, disturbed and interaction zones around fully confined detonating charges

Onederra, I., Catalan, A. and Chitombo, G. (2013) Modelling fracturing, disturbed and interaction zones around fully confined detonating charges. Mining Technology, 122 1: 20-32. doi:10.1179/1743286312Y.0000000021

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Author Onederra, I.
Catalan, A.
Chitombo, G.
Title Modelling fracturing, disturbed and interaction zones around fully confined detonating charges
Journal name Mining Technology   Check publisher's open access policy
ISSN 1474-9009
1743-2863
Publication date 2013
Sub-type Article (original research)
DOI 10.1179/1743286312Y.0000000021
Volume 122
Issue 1
Start page 20
End page 32
Total pages 13
Place of publication Leeds, United Kingdom
Publisher Maney
Collection year 2014
Language eng
Abstract In order to gain better insights into the complex mechanisms at play under fully confined blasting conditions in mining applications, several models were constructed and analysed using the hybrid stress blasting model (HSBM). A disturbed zone or microdamage criterion was proposed and used in the modelling analysis. It combined a lattice bond contact tensile failure criteria and a simple peak particle velocity based approach. Estimates were made of the extent of fracturing, disturbed and interaction zones from fully confined blastholes spaced at distances of up to 18 m, simultaneously initiated with primers positioned every 8 m. Continuous interaction was evident along the explosive column at spacings of ,15 m. When blastholes were spaced at 18 m, the attenuation of the stress wave showed only partial or limited interaction along the column. With regards to the influence of in situ stress magnitudes in the range of 500–1500 m, modelling results appeared to capture the impact of stress intensity on the final extension of the macrofracturing zone. At depths of 1200 m and above, the degree of continuous interaction was diminished at the level of the initiating primers. For the simulated geotechnical conditions, the orientation of radial fractures with respect to the principal stress direction is more evident at anisotropy ratios greater than two. However, the extent and shape of the disturbed zone does not appear to be influenced by anisotropy, which showed a deficiency in the implementation of in situ stresses in the current modelling framework and further work is being conducted to address this limitation.
Keyword Confined blasting
Blast damage modelling
Blast preconditioning
Explosive rock interaction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
Sustainable Minerals Institute Publications
 
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Created: Wed, 10 Apr 2013, 11:11:50 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering