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Dahner-Lindqvist, Christina
Publications (2 of 2) Show all publications
Edelbro, C., Sjöberg, J., Dahner-Lindqvist, C. & Malmgren, L. (2012). Prediction and follow-up of failure and fallouts in footwall drifts in the Kiirunavaara mine (ed.). Canadian geotechnical journal (Print), 49(5), 546-559
Open this publication in new window or tab >>Prediction and follow-up of failure and fallouts in footwall drifts in the Kiirunavaara mine
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

Keywords
Civil engineering and architecture - Geoengineering and mining engineering, Bergmekanik, Mining, Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-4638 (URN)10.1139/t2012-012 (DOI)000303505000004 ()2-s2.0-84860465685 (Scopus ID)29ca456b-92b2-48a6-85b0-741a42347aae (Local ID)29ca456b-92b2-48a6-85b0-741a42347aae (Archive number)29ca456b-92b2-48a6-85b0-741a42347aae (OAI)
Note

Validerad; 2012; 20120412 (carik)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Villegas, T., Nordlund, E. & Dahner-Lindqvist, C. (2011). Hangingwall surface subsidence at the Kiirunavaara mine, Sweden (ed.). Paper presented at . Engineering Geology, 121(1-2), 18-27
Open this publication in new window or tab >>Hangingwall surface subsidence at the Kiirunavaara mine, Sweden
2011 (English)In: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 121, no 1-2, p. 18-27Article in journal (Refereed) Published
Abstract [en]

Large scale surface subsidence has been experienced at the Kiirunavaara mine since sublevel caving was implemented as a mining method. Surface disturbances are affecting part of the city of Kiruna, the railway, and the power station. Continuous and discontinuous subsidences characterize the hangingwall deformation, which is periodically monitored using surveying techniques and mapping of surface cracks. A historic review of subsidence prognoses was carried out and the results were compared with the actual condition of the hangingwall. The review showed discrepancies between different prognoses. In addition, limit equilibrium analyses indicated that break angles flatten while the mining depth increases. However, this tendency is not clear in the field where break angles show a large dispersion of values. On the other hand, using surveying data, two different analyses were performed. The time-dependent movements of the hangingwall were described using time-displacement curves and strain analysis was performed for different sections of the hangingwall. Three different stages of the time-displacement behaviour were identified and described. Finally, it was concluded that extension strain can reach values which may damage civil structures before surface crack can be observed.

National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-13580 (URN)10.1016/j.enggeo.2011.04.010 (DOI)000292943100003 ()2-s2.0-79959276552 (Scopus ID)cd130d2f-9718-4d53-8b1f-b232b346c0d4 (Local ID)cd130d2f-9718-4d53-8b1f-b232b346c0d4 (Archive number)cd130d2f-9718-4d53-8b1f-b232b346c0d4 (OAI)
Note
Validerad; 2011; 20110416 (tomvil)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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