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Prediction and follow-up of failure and fallouts in footwall drifts in the Kiirunavaara 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.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2012 (English)In: Canadian geotechnical journal (Print), ISSN 0008-3674, E-ISSN 1208-6010, Vol. 49, no 5, p. 546-559Article in journal (Refereed) Published
Abstract [en]

A likely result of changes in rock stresses due to progressing mining is an increased number of compressive stress–induced failures. This paper presents the results from numerical analysis and observations of stress-induced fallouts infootwall drifts in the Kiirunavaara underground mine. A brittle-plastic cohesion-softening friction-hardening (CSFH) material model was used for simulating brittle fallouts. To account for mining-induced stress changes, the local model stress boundary conditions were extracted from a global model. The rock mass properties were based on field observations in the footwall drifts as well as on results from laboratory testing. A multi-stage analysis was carried out to gradually change the stresses to simulate mining progress. A parametric study was conducted in which strength properties, location, and shape of the footwall drift were varied. Yielded elements and maximum shear strain were used as damage and fallout indicators. The modelling results were sensitive to the shape of the drift. The location of the predicted fallouts was in good agreement with the location of observed fallouts for the case in which the drift roof was simulated flatter than the theoretical cross section. The results indicate that the true shape of the drift is different from the planned one

Place, publisher, year, edition, pages
2012. Vol. 49, no 5, p. 546-559
Keywords [en]
Civil engineering and architecture - Geoengineering and mining engineering
Keywords [sv]
Bergmekanik, Mining, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-4638DOI: 10.1139/t2012-012ISI: 000303505000004Scopus ID: 2-s2.0-84860465685Local ID: 29ca456b-92b2-48a6-85b0-741a42347aaeOAI: oai:DiVA.org:ltu-4638DiVA, id: diva2:977512
Note

Validerad; 2012; 20120412 (carik)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Edelbro, CatrinSjöberg, JonnyDahner-Lindqvist, ChristinaMalmgren, Lars

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