Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine
Building on the empirical research completed in the footwall contact zone of LKAB’s Malmberget mine, a method has been developed for predicting damage in the crosscut entries of the mine layout. Threedimensional stress measurements combined with analyses of measured and observed damage in the crossc...
Published in: | Caving 2022: Fifth International Conference on Block and Sublevel Caving |
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Luleå tekniska universitet, Geoteknologi
2022
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ftluleatu:oai:DiVA.org:ltu-93518 2023-05-15T17:10:09+02:00 Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine Jones, TH Saiang, David 2022 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-93518 https://doi.org/10.36487/ACG_repo/2205_69 eng eng Luleå tekniska universitet, Geoteknologi LKAB, Sweden Caving 2022: Fifth International Conference on Block and Sublevel Caving Volume Two, p. 1007-1018 orcid:0000-0001-8001-9745 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-93518 doi:10.36487/ACG_repo/2205_69 info:eu-repo/semantics/openAccess differential stress damage condition ratings Geologic Strength Index Mineral and Mine Engineering Mineral- och gruvteknik Conference paper info:eu-repo/semantics/conferenceObject text 2022 ftluleatu https://doi.org/10.36487/ACG_repo/2205_69 2022-10-25T20:59:03Z Building on the empirical research completed in the footwall contact zone of LKAB’s Malmberget mine, a method has been developed for predicting damage in the crosscut entries of the mine layout. Threedimensional stress measurements combined with analyses of measured and observed damage in the crosscuts have allowed new interpretations of the crosscut performance. Stress analysis focused on the relative differential stresses measured in the area of interest. These stress changes were then linked directly to observed changes in the entry condition according to the Entry Condition Rating (ECR) system, a damage mapping system developed for the mine. A bilinear model was used to describe the entry condition rate of change such that the peak measured differential stress corresponds to increased degradation rates. These bilinear degradation rate trends are shown to be directly related to the geotechnical qualities of the rock using the Geologic Strength Index (GSI) of the monitored locations, irrespective of lithology. The final step was to develop an empirical model that allows prediction of a crosscut’s future ECR based on changes in the relative differential stress and the GSI of the crosscut. In combination with simple numerical modelling tools the model can be used to predict ahead of time when additional reinforcement will be necessary. Funder: Luossavaara Kiirunavaara AB (406); ISBN för värdpublikation: 978-0-6450938-3-4 Design Methods for Variable Stress, Variable-Geology Environments Conference Object Malmberget Luleå University of Technology Publications (DiVA) Luossavaara ENVELOPE(20.233,20.233,67.867,67.867) Caving 2022: Fifth International Conference on Block and Sublevel Caving 1007 1018 |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
differential stress damage condition ratings Geologic Strength Index Mineral and Mine Engineering Mineral- och gruvteknik |
spellingShingle |
differential stress damage condition ratings Geologic Strength Index Mineral and Mine Engineering Mineral- och gruvteknik Jones, TH Saiang, David Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine |
topic_facet |
differential stress damage condition ratings Geologic Strength Index Mineral and Mine Engineering Mineral- och gruvteknik |
description |
Building on the empirical research completed in the footwall contact zone of LKAB’s Malmberget mine, a method has been developed for predicting damage in the crosscut entries of the mine layout. Threedimensional stress measurements combined with analyses of measured and observed damage in the crosscuts have allowed new interpretations of the crosscut performance. Stress analysis focused on the relative differential stresses measured in the area of interest. These stress changes were then linked directly to observed changes in the entry condition according to the Entry Condition Rating (ECR) system, a damage mapping system developed for the mine. A bilinear model was used to describe the entry condition rate of change such that the peak measured differential stress corresponds to increased degradation rates. These bilinear degradation rate trends are shown to be directly related to the geotechnical qualities of the rock using the Geologic Strength Index (GSI) of the monitored locations, irrespective of lithology. The final step was to develop an empirical model that allows prediction of a crosscut’s future ECR based on changes in the relative differential stress and the GSI of the crosscut. In combination with simple numerical modelling tools the model can be used to predict ahead of time when additional reinforcement will be necessary. Funder: Luossavaara Kiirunavaara AB (406); ISBN för värdpublikation: 978-0-6450938-3-4 Design Methods for Variable Stress, Variable-Geology Environments |
format |
Conference Object |
author |
Jones, TH Saiang, David |
author_facet |
Jones, TH Saiang, David |
author_sort |
Jones, TH |
title |
Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine |
title_short |
Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine |
title_full |
Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine |
title_fullStr |
Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine |
title_full_unstemmed |
Empirical damage prediction in sublevel cave crosscuts at the Malmberget mine |
title_sort |
empirical damage prediction in sublevel cave crosscuts at the malmberget mine |
publisher |
Luleå tekniska universitet, Geoteknologi |
publishDate |
2022 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-93518 https://doi.org/10.36487/ACG_repo/2205_69 |
long_lat |
ENVELOPE(20.233,20.233,67.867,67.867) |
geographic |
Luossavaara |
geographic_facet |
Luossavaara |
genre |
Malmberget |
genre_facet |
Malmberget |
op_relation |
Caving 2022: Fifth International Conference on Block and Sublevel Caving Volume Two, p. 1007-1018 orcid:0000-0001-8001-9745 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-93518 doi:10.36487/ACG_repo/2205_69 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.36487/ACG_repo/2205_69 |
container_title |
Caving 2022: Fifth International Conference on Block and Sublevel Caving |
container_start_page |
1007 |
op_container_end_page |
1018 |
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1766066583494459392 |