Empirical charts for estimation of minimum time response (Tmin) in free face blasting

Onederra, I. (2007) Empirical charts for estimation of minimum time response (Tmin) in free face blasting. Transactions of the Institutions of Mining and Metallurgy Section A: Mining Technology, 116 1: 7-15.


Author Onederra, I.
Title Empirical charts for estimation of minimum time response (Tmin) in free face blasting
Formatted title Empirical charts for estimation of minimum time response (Tmin) in free face blasting
Journal name Transactions of the Institutions of Mining and Metallurgy Section A: Mining Technology   Check publisher's open access policy
ISSN 1474-9009
1743-2863
Publication date 2007
Sub-type Article (original research)
DOI 10.1179/174328407X172987
Volume 116
Issue 1
Start page 7
End page 15
Total pages 9
Editor P. A. Dowd
Place of publication Hanover Walk, Leeds, W. Yorks, U.K.
Publisher Maney Publishing
Collection year 2008
Language eng
Subject C1
290701 Mining Engineering
640200 Primary Mining and Extraction Processes
091405 Mining Engineering
Formatted abstract In drilling and blasting, it is widely accepted that the optimisation of delay timing (interhole and inter-row) can have a positive impact on fragmentation, muckpile characteristics, damage control and ground vibrations. In surface (free face) blasting in particular, minimum response time, also referred to as burden movement time Tmin has shown to be a useful engineering index to help with the selection of optimal interhole and inter-row delays. Minimum response time is defined as the time between explosive detonation and rock mass movement. It is hypothesised that in order to improve breakage through the cooperation of adjacent explosive charges, delay intervals should be less than the expected minimum response time; conversely, in order to provide adequate relief between rows of holes and thus reduce confinement, delay intervals should exceed the expected minimum response time. This paper presents an empirical approach to estimate Tmin values for different blasting conditions. The proposed model is explained and empirical charts developed with the view to provide a practical tool for first pass calculations.
Keyword Surface blasting
Bueden movement time
Response time
Delay timing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Mon, 25 Feb 2008, 13:51:23 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre