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A feasibility study on controlling ground vibrations caused by blasts in Malmberget underground mine
LKAB, Research & Development, 983 81 Malmberget.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
LKAB, Research & Development, 983 81 Malmberget.
LKAB, Research & Development, 983 81 Malmberget.
2010 (English)In: Fragblast, ISSN 1385-514X, E-ISSN 1744-4977, Vol. 8, no 1, p. 3-21Article in journal (Refereed) Published
Abstract [en]

In order to control or reduce the ground vibrations caused by underground blasts in Malmberget mine, a number of blast tests were carried out during production blasts and a series of single shot waveforms were obtained. Then the single shot waveforms from the same ring or different rings were analysed and compared with each other. The results showed that the single shots are reproducible, meaning that the ground vibrations caused by underground blasts can be controlled by means of the interference of the vibration waveforms measured. Finally, a formal test using electronic detonators and employing an optimum delay time of 8 ms was done in production. The test for an 11-borehole ring shows that the maximum vertical ground vibrations are reduced to the maximum vertical vibrations of a single shot. Particularly, the total vibration history for the 11-borehole-ring blast is shortened to about 200 ms over a velocity of 2 mm/s. However, the total vibration history of a normal production blast of 11-borehole ring is always 1400 ms over a velocity of 2 mm/s, namely the total vibration time of a production blast can be reduced to one seventh of that of the common production blasts by using the vibration control method. This indicates that the vibration control method introduced in the paper is feasible for underground mining blasts

Place, publisher, year, edition, pages
2010. Vol. 8, no 1, p. 3-21
Keywords [en]
Civil engineering and architecture - Geoengineering and mining engineering
Keywords [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-9457DOI: 10.1080/13855140512331389604Local ID: 818dc0a0-2aa7-11df-be83-000ea68e967bOAI: oai:DiVA.org:ltu-9457DiVA, id: diva2:982395
Note

Validerad; 2010; 20100308 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-20Bibliographically approved

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Lindqvist, Per-Arne

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