Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques

Detalhes bibliográficos
Autor(a) principal: Chaves,Leonardo Soares
Data de Publicação: 2020
Outros Autores: Carvalho,Luiz Alberto, Souza,Felipe Ribeiro, Nader,Beck, Ortiz,Carlos Enrique Arroyo, Torres,Vidal Félix Navarro, Câmara,Taís Renata, Napa-García,Gian Franco, Valadão,George Eduardo Sales
Tipo de documento: Artigo
Idioma: eng
Título da fonte: REM - International Engineering Journal
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2020000100119
Resumo: Abstract The traditionally and widely used Lerchs-Grossmann algorithm presents well-known limitations that newer propositions attempt to overcome. The direct block schedule (DBS) methodology, which has gained relevance with computational advances, obtains the final pit as a natural result of production sequencing, different from Lerchs-Grossmann-based algorithms. This process flow applies constraints in the final pit definition stage attempting to provide a more realistic result and to minimize risks. Slope instability is a common and inherent risk to open pit mining and may affect the project's net present value (NPV). A study of the impacts of slope angle variations on safety indexes and final pit NPV provides an auxiliary tool for the overall slope angle definition process. This article presents a case study in which the effects of variations of the overall slope angle on the safety factor (SF) and project NPV were analyzed. A total of 25 pits were generated by each studied final pit definition methodology, and each pit had the sections with the varied slope angles analyzed in the stability assessment, resulting in a total of 150 slopes analyzed. A comparison between the results obtained by the two different methodologies implemented in commercial software is presented. The results show no relationship between the NPV and the overall slope angle using the DBS methodology. An analysis of the results for each geotechnical sector obtained by the traditional methodology was conducted and may contribute to the trade-off analysis between the best slope angle to achieve a reasonable SF and the maximum NPV.
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spelling Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniquesoverall slope angledirect block scheduleoptimizationnet present valueAbstract The traditionally and widely used Lerchs-Grossmann algorithm presents well-known limitations that newer propositions attempt to overcome. The direct block schedule (DBS) methodology, which has gained relevance with computational advances, obtains the final pit as a natural result of production sequencing, different from Lerchs-Grossmann-based algorithms. This process flow applies constraints in the final pit definition stage attempting to provide a more realistic result and to minimize risks. Slope instability is a common and inherent risk to open pit mining and may affect the project's net present value (NPV). A study of the impacts of slope angle variations on safety indexes and final pit NPV provides an auxiliary tool for the overall slope angle definition process. This article presents a case study in which the effects of variations of the overall slope angle on the safety factor (SF) and project NPV were analyzed. A total of 25 pits were generated by each studied final pit definition methodology, and each pit had the sections with the varied slope angles analyzed in the stability assessment, resulting in a total of 150 slopes analyzed. A comparison between the results obtained by the two different methodologies implemented in commercial software is presented. The results show no relationship between the NPV and the overall slope angle using the DBS methodology. An analysis of the results for each geotechnical sector obtained by the traditional methodology was conducted and may contribute to the trade-off analysis between the best slope angle to achieve a reasonable SF and the maximum NPV.Fundação Gorceix2020-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2020000100119REM - International Engineering Journal v.73 n.1 2020reponame:REM - International Engineering Journalinstname:Fundação Gorceix (FG)instacron:FG10.1590/0370-44672019730011info:eu-repo/semantics/openAccessChaves,Leonardo SoaresCarvalho,Luiz AlbertoSouza,Felipe RibeiroNader,BeckOrtiz,Carlos Enrique ArroyoTorres,Vidal Félix NavarroCâmara,Taís RenataNapa-García,Gian FrancoValadão,George Eduardo Saleseng2020-01-06T00:00:00Zoai:scielo:S2448-167X2020000100119Revistahttps://www.rem.com.br/?lang=pt-brPRIhttps://old.scielo.br/oai/scielo-oai.php||editor@rem.com.br2448-167X2448-167Xopendoar:2020-01-06T00:00REM - International Engineering Journal - Fundação Gorceix (FG)false
dc.title.none.fl_str_mv Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
title Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
spellingShingle Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
Chaves,Leonardo Soares
overall slope angle
direct block schedule
optimization
net present value
title_short Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
title_full Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
title_fullStr Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
title_full_unstemmed Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
title_sort Analysis of the impacts of slope angle variation on slope stability and NPV via two different final pit definition techniques
author Chaves,Leonardo Soares
author_facet Chaves,Leonardo Soares
Carvalho,Luiz Alberto
Souza,Felipe Ribeiro
Nader,Beck
Ortiz,Carlos Enrique Arroyo
Torres,Vidal Félix Navarro
Câmara,Taís Renata
Napa-García,Gian Franco
Valadão,George Eduardo Sales
author_role author
author2 Carvalho,Luiz Alberto
Souza,Felipe Ribeiro
Nader,Beck
Ortiz,Carlos Enrique Arroyo
Torres,Vidal Félix Navarro
Câmara,Taís Renata
Napa-García,Gian Franco
Valadão,George Eduardo Sales
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Chaves,Leonardo Soares
Carvalho,Luiz Alberto
Souza,Felipe Ribeiro
Nader,Beck
Ortiz,Carlos Enrique Arroyo
Torres,Vidal Félix Navarro
Câmara,Taís Renata
Napa-García,Gian Franco
Valadão,George Eduardo Sales
dc.subject.por.fl_str_mv overall slope angle
direct block schedule
optimization
net present value
topic overall slope angle
direct block schedule
optimization
net present value
description Abstract The traditionally and widely used Lerchs-Grossmann algorithm presents well-known limitations that newer propositions attempt to overcome. The direct block schedule (DBS) methodology, which has gained relevance with computational advances, obtains the final pit as a natural result of production sequencing, different from Lerchs-Grossmann-based algorithms. This process flow applies constraints in the final pit definition stage attempting to provide a more realistic result and to minimize risks. Slope instability is a common and inherent risk to open pit mining and may affect the project's net present value (NPV). A study of the impacts of slope angle variations on safety indexes and final pit NPV provides an auxiliary tool for the overall slope angle definition process. This article presents a case study in which the effects of variations of the overall slope angle on the safety factor (SF) and project NPV were analyzed. A total of 25 pits were generated by each studied final pit definition methodology, and each pit had the sections with the varied slope angles analyzed in the stability assessment, resulting in a total of 150 slopes analyzed. A comparison between the results obtained by the two different methodologies implemented in commercial software is presented. The results show no relationship between the NPV and the overall slope angle using the DBS methodology. An analysis of the results for each geotechnical sector obtained by the traditional methodology was conducted and may contribute to the trade-off analysis between the best slope angle to achieve a reasonable SF and the maximum NPV.
publishDate 2020
dc.date.none.fl_str_mv 2020-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2020000100119
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2020000100119
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0370-44672019730011
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Fundação Gorceix
publisher.none.fl_str_mv Fundação Gorceix
dc.source.none.fl_str_mv REM - International Engineering Journal v.73 n.1 2020
reponame:REM - International Engineering Journal
instname:Fundação Gorceix (FG)
instacron:FG
instname_str Fundação Gorceix (FG)
instacron_str FG
institution FG
reponame_str REM - International Engineering Journal
collection REM - International Engineering Journal
repository.name.fl_str_mv REM - International Engineering Journal - Fundação Gorceix (FG)
repository.mail.fl_str_mv ||editor@rem.com.br
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