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A New Concept for Timing Double Ring Blasts: Results from small-scale blasting tests
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Sub-level caving (SLC) is an important mass mining method which is based upon the utilization of gravity flow of waste material and blasted ore. The method function on the principle that ore is fragmented by blasting, while the overlying host rock fractures and caves by the action of mine induced stresses and gravity. The caved rock or debris from the previous blasted rings reduces the fragmentation and the swelling of the blasted ring as it absorbs some of the explosive energy and preventing all energy of the explosive to break the ore.The main objective of this thesis is to investigate a new concept for timing double ring blasts in terms of fragmentation. For this purpose, a series of tests has been made in small-scale SLC blocks. The idea is to blast two rings at the same time, but with a short delay time between the rings. In this case, the second ring will be blasted first which will create a slot between the blasted burden and the remaining rock which will eventually provide a free face for the first ring. This may result in improved fragmentation.

Place, publisher, year, edition, pages
2013. , 87 p.
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-47723Local ID: 53c893f7-d7ca-412f-a203-406f5e4e311eOAI: diva2:1021051
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Validerat; 20130501 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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