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Field monitoring seismic response of underground excavations and rock bolts at kiirunavaara underground mine
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0003-4857-2238
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0001-9419-2207
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2019 (English)In: Rock Mechanics for Natural Resources and Infrastructure Development - Full Papers: Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering (ISRM 2019), September 13-18, 2019, Foz do Iguassu, Brazil / [ed] Sergio A.B. Fontoura; Ricardo Rocca; José Mendoza, Taylor & Francis, 2019, p. 1372-1379Conference paper, Published paper (Refereed)
Abstract [en]

To assess the performance of underground excavations and ground support when subjected to mining-induced seismicity, a site has been instrumented at the Kiirunavaara mine. Geophones, multi-point extensometers and instrumented bolts were installed at the site. After the installation, several large seismic events (local magnitude>1.5) have occurred near the site and caused serious damages. The results from site monitoring indicate that the seismic waves are amplified near the excavation surface. The rock mass and rock bolts respond to mining-induced seismicity with step changes in displacement. The ejection velocity back-calculated from the energy absorbed in the rock bolts shows good agreement with the measured peak particle velocity (PPV). It is concluded that the scaling law used to evaluate the ground motion near excavation surface needs to be improved by considering velocity amplification. Repeated loading from multiple seismic events should be considered to assess rockburst damage.

Place, publisher, year, edition, pages
Taylor & Francis, 2019. p. 1372-1379
Series
Proceedings in Earth and geosciences, ISSN 2639-7749, E-ISSN 2639-7757 ; 6
National Category
Mineral and Mine Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-80817Scopus ID: 2-s2.0-85084650551OAI: oai:DiVA.org:ltu-80817DiVA, id: diva2:1468210
Conference
14th International Congress on Rock Mechanics and Rock Engineering (ISRM 2019), Foz do Iguassu, Brazil, 13-18 September, 2019
Funder
VinnovaSwedish Research Council Formas
Note

ISBN för värdpublikation: 978-0-367-42284-4; 978-0-367-82317;

Funder: LKAB (2014-01944, 2017-02228); Lundin Mining; Conselho Nacional de Desenvolvimento Científico e Tecnológico

Available from: 2020-09-17 Created: 2020-09-17 Last updated: 2021-09-27Bibliographically approved

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Zhang, PingBotelho, AnnelieseDineva, Savka

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