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Observations and modelling of failure of hard rock masses
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2007 (English)In: Deep Mining 07: proceedings of the fourth International Seminar on Deep and High Stress Mining, 7-9 November 2007, Perth, Australia / [ed] Yves Potvin, Perth, W.A: Australian Centre for Geomechanics, 2007, 81-94 p.Conference paper (Refereed)
Abstract [en]

The objective of this paper is to run field data, without modification, for a number of case studies in different numerical models to find the best non-calibrated approach. The purpose of the comparison is to identify which frequently used approach gives the best agreement with the observed fallouts with respect to location, depth, shape, and extent. All of the five case studies are situated in hard rock masses that are massive or sparsely fractured, at depths of 630-965 m below surface. The observed fallouts are compared with the results from numerical models in Examine2D and Phase2D. None of the studied approaches give perfect agreement with the actual fallouts. This study demonstrates that when rock mass strength parameters are defined by either the Hoek-Brown or the Mohr-Coulomb criterion, the elastic and elastic-perfectly plastic models reasonably well predict actual fallout depth, although the extent of fallout is exaggerated and the shape incorrect. Therefore, a precise estimation can not be expected. When using the m=0 approach, the results were in poor agreement with the observed fallout. The fallouts are significantly overestimated when applying the brittle-plastic models using instantaneous softening by cohesion and friction or cohesion weakening.

Place, publisher, year, edition, pages
Perth, W.A: Australian Centre for Geomechanics, 2007. 81-94 p.
Research subject
Mining and Rock Engineering
URN: urn:nbn:se:ltu:diva-30681Local ID: 491e0130-668c-11dc-a0c3-000ea68e967bISBN: 9780980418521OAI: diva2:1003910
International Seminar on Deep and High Stress Mining : 07/11/2007 - 09/11/2007
Godkänd; 2007; 20070919 (carik)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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