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Numerical analyses of the effect of larger-scale geological structures on the hangingwall subsidence at Kiirunavaara mine
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-9766-0106
2010 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

The current mining method, sublevel caving at the Kiirunavaara iron ore mine, has induced large scale subsidence to the hangingwall. The orebody dips, on average, 60° eastward. Therefore the subsidence is developing toward the city of Kiruna, the railway and other infrastructure. One of the most important factors which can affect the hangingwall subsidence is the existence of large-scale geological structures in the hangingwall. The 2D distinct element code UDEC was used in this work to evaluate the effect of geological structures on the hangingwall subsidence. One so called "basic model" was run without any geological structures. One structure set with the dip in the interval 50° - 90° to the east has been then analyzed. The failure surface at each mining level was defined for the different models through failure indicators e.g. yielded elements in shear and tension and surface critical vertical displacement. To evaluate the effect of each orientation on the hangingwall subsidence, the break angle was calculated at each mining level. The results showed that inclined structures had an obvious effect on the extension of the failure surface on the hangingwall. All models with large-scale structures showed a decrease of the break angle compared to the basic model. The structure orientations showed a tendency to govern the direction of shear and tensile failure in the models. The results indicate that it is important to identify the dominating structures and their orientation and the structural geological domains. Keywords: Numerical analysis, Geological structures, failure surface, Break angle.

Place, publisher, year, edition, pages
2010.
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-29948Local ID: 3959ac30-08f6-11e0-b767-000ea68e967bOAI: oai:DiVA.org:ltu-29948DiVA, id: diva2:1003175
Conference
Scandinavian Rock Mechanic Conference : 09/07/2010 - 12/07/2010
Note
Godkänd; 2010; 20101216 (shashi)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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Shirzadegan, ShahinNordlund, ErlingVillegas, Tomas

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