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Probabilistic Stability Analysis of Open Stopes in Sublevel Stoping Method by Numerical Modeling.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Probabilistic Stability Analysis of Open Stopes in Sublevel Stoping Method by Numerical Modeling./
作者:	Heidarzadeh, Shahriyar.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	190 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
Contained By:	Dissertations Abstracts International80-09B.
標題:	Geotechnology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13428132
ISBN:	9780438848566

Probabilistic Stability Analysis of Open Stopes in Sublevel Stoping Method by Numerical Modeling.
Heidarzadeh, Shahriyar.

Probabilistic Stability Analysis of Open Stopes in Sublevel Stoping Method by Numerical Modeling. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 190 p.

Source: Dissertations Abstracts International, Volume: 80-09, Section: B.

Thesis (Ph.D.)--Universite du Quebec a Chicoutimi (Canada), 2019.

This item must not be added to any third party search indexes.

Over the past years, maintaining the stability of underground excavations has grabbed attention with the growing tendency of exploitation of deep underground mineral resources. Since sublevel stoping is recognized as the most widely applied method in Canadian underground mines, assessing the open stope stability develops concern for rock mechanics engineers over preserving mining production capacity and providing safety for workers and equipment. Stress-induced failure is among the most common causes of instability for underground open stopes. The probability of failure (POF) depends on a number of factors including rock mass properties, in situ stress state and stope geometry. One of the most reliable approaches for evaluating the influence of the above mentioned factors on open stope stability, is the use of probabilistic methods in conjunction with numerical analysis. Various powerful probabilistic methods (e.g. Monte Carlo Simulation, Random Monte Carlo Simulation and Response Surface Methodology) in conjunction with the finite difference code FLAC3D have been applied throughout our research. In fact, the present research provides a comprehensive methodology to perform a numerical evaluation of the effect of open stope geometrical parameters (i.e., stope strike length, stope width, and etc.) on the potential of rock mass brittle damage, as well as the probability of stope failure (POF) by considering two modes of relaxation-related gravity driven (tensile) failure, and rock mass brittle failure. Monte Carlo Simulation (MCS) and Response Surface Methodology (RSM) are employed to determine the significant individual effects and their interactions of the geometric parameters. This study applies geometrical parameters derived from a survey of numerous open stopes from the Canadian Shield. Evaluation of the effect of stope geometry on the rock mass brittle damage indicates that independent from mining depth, the highest range of brittle damage is observed for the stopes with moderate range of hanging wall hydraulic radius (HR) and high range of hanging wall dip. While the lowest values of brittle damage is observed for the stopes having low-moderate values of hanging wall HR and low-moderate values of hanging wall dip. Also, the individual and interactive effect of stope geometrical parameters on the rock mass brittle damage is found to be significant. Assessing of the effect of stope geometry on the probability of tensile failure (POF) has pointed out that three parameters, which are the stope hanging wall HR, stope span width and stope hanging wall dip, have a strong influence on the stope stability state. Also it was found that the POF is significantly controlled by interaction effects between span width / hanging wall HR and hanging wall dip / hanging wall HR. Moreover, according to the results of the mathematical optimization, the maximum stability (in terms of POF) occurs for shallow dipping narrow stopes having large hanging wall HR. Whereas, the minimum stability would happen in moderately to steeply dipping wide stopes with small hanging wall HR values. Also, a probabilistic stability analysis was performed on seven primary open stopes located in mining blocks V and VI at the Niobec underground mine (Saint-Honore, Quebec). Probabilistic methods with the finite difference code FLAC3D, are employed to evaluate the stability state of each studied stope, taking into onsideration the inherent variability associated with the geomechanical parameters of the rock mass. The stability state is defined via the tensile and compressive probabilities of failure (POF) and the probability of brittle damage initiation (PDI). Monte Carlo simulation generates the probabilistic rock mass input parameters while Random Monte Carlo simulations applied a random spatial distribution of the geomechanical parameters within the rock mass. The results indicate that for the evaluated open stopes, tensile and compressive failures share similar POFs. However, according to the PDI values around all the open stopes, no brittle failure is expected to occur under the existing conditions of rock mass quality and in-situ stress regime in mining blocks V and VI at the Niobec Mine.

ISBN: 9780438848566Subjects--Topical Terms:

1018558
Geotechnology.

Probabilistic Stability Analysis of Open Stopes in Sublevel Stoping Method by Numerical Modeling.
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245 1 0 $a Probabilistic Stability Analysis of Open Stopes in Sublevel Stoping Method by Numerical Modeling.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 190 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Saeidi, Ali;Rouleau, Alain.
502 $a Thesis (Ph.D.)--Universite du Quebec a Chicoutimi (Canada), 2019.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Over the past years, maintaining the stability of underground excavations has grabbed attention with the growing tendency of exploitation of deep underground mineral resources. Since sublevel stoping is recognized as the most widely applied method in Canadian underground mines, assessing the open stope stability develops concern for rock mechanics engineers over preserving mining production capacity and providing safety for workers and equipment. Stress-induced failure is among the most common causes of instability for underground open stopes. The probability of failure (POF) depends on a number of factors including rock mass properties, in situ stress state and stope geometry. One of the most reliable approaches for evaluating the influence of the above mentioned factors on open stope stability, is the use of probabilistic methods in conjunction with numerical analysis. Various powerful probabilistic methods (e.g. Monte Carlo Simulation, Random Monte Carlo Simulation and Response Surface Methodology) in conjunction with the finite difference code FLAC3D have been applied throughout our research. In fact, the present research provides a comprehensive methodology to perform a numerical evaluation of the effect of open stope geometrical parameters (i.e., stope strike length, stope width, and etc.) on the potential of rock mass brittle damage, as well as the probability of stope failure (POF) by considering two modes of relaxation-related gravity driven (tensile) failure, and rock mass brittle failure. Monte Carlo Simulation (MCS) and Response Surface Methodology (RSM) are employed to determine the significant individual effects and their interactions of the geometric parameters. This study applies geometrical parameters derived from a survey of numerous open stopes from the Canadian Shield. Evaluation of the effect of stope geometry on the rock mass brittle damage indicates that independent from mining depth, the highest range of brittle damage is observed for the stopes with moderate range of hanging wall hydraulic radius (HR) and high range of hanging wall dip. While the lowest values of brittle damage is observed for the stopes having low-moderate values of hanging wall HR and low-moderate values of hanging wall dip. Also, the individual and interactive effect of stope geometrical parameters on the rock mass brittle damage is found to be significant. Assessing of the effect of stope geometry on the probability of tensile failure (POF) has pointed out that three parameters, which are the stope hanging wall HR, stope span width and stope hanging wall dip, have a strong influence on the stope stability state. Also it was found that the POF is significantly controlled by interaction effects between span width / hanging wall HR and hanging wall dip / hanging wall HR. Moreover, according to the results of the mathematical optimization, the maximum stability (in terms of POF) occurs for shallow dipping narrow stopes having large hanging wall HR. Whereas, the minimum stability would happen in moderately to steeply dipping wide stopes with small hanging wall HR values. Also, a probabilistic stability analysis was performed on seven primary open stopes located in mining blocks V and VI at the Niobec underground mine (Saint-Honore, Quebec). Probabilistic methods with the finite difference code FLAC3D, are employed to evaluate the stability state of each studied stope, taking into onsideration the inherent variability associated with the geomechanical parameters of the rock mass. The stability state is defined via the tensile and compressive probabilities of failure (POF) and the probability of brittle damage initiation (PDI). Monte Carlo simulation generates the probabilistic rock mass input parameters while Random Monte Carlo simulations applied a random spatial distribution of the geomechanical parameters within the rock mass. The results indicate that for the evaluated open stopes, tensile and compressive failures share similar POFs. However, according to the PDI values around all the open stopes, no brittle failure is expected to occur under the existing conditions of rock mass quality and in-situ stress regime in mining blocks V and VI at the Niobec Mine.
520 $a Pendant les dernieres annees, le maintien de la stabilitedes excavations souterraines a attire l'attention avec la tendancecroissante a l'exploitation des ressources minerales souterrainesprofondes. Etant donne que la methode des chantiers ouvertsest reconnue comme la methode la plus largement utilisee dansles mines souterraines canadiennes, l'evaluation de la stabilitede ces chantiers suscite des inquietudes chez les ingenieursen mecanique des roches quant a la preservation de lacapacite de production miniere et a la securitedes travailleurs et de l'equipement. La rupture induite par la concentrationdes contraintes est l'une des causes les plus courantes d'instabilitepour les chantiers souterrains ouverts. La probabilite de rupture (POF)depend d'un certain nombre de facteurs, dont les proprietesdu massif rocheux, l'etat de contrainte in situ et la geometriedu chantier. L'utilisation de methodes probabilistesen conjonction avec l'analyse numerique est l'une des approchesles plus fiables pour evaluer l'influence des facteurs susmentionnessur la stabilite des chantiers. Diverses methodes probabilistesayant fait leurs preuves (par exemple, la simulation de Monte Carlo, la simulationde Monte Carlo aleatoire et la methodologie de surface de reponse),associees au code de differences finies FLAC3D, ont eteappliquees tout au long de la presente recherche. En fait, la presente recherche fournit une methodologie completepour effectuer une evaluation numerique de l'effet desparametres geometriques des chantiers ouverts (c'est-a-direla longueur du chantier, la largeur du chantier, etc.) sur le potentiel desdommages et la probabilite de rupture du chantier (POF) en considerantdeux modes de rupture, soit celle due a la gravite (traction)liee a la relaxation et la rupture fragile de la masse rocheuse.La simulation de Monte Carlo (MCS) et la methodologie de surface dereponse (RSM) sont utilisees pour determiner les effetsindividuels et d'interaction significatifs des parametres geometriques.Cette etude applique des parametres geometriquesderives d'un inventaire de nombreux chantiers ouverts dans leBouclier canadien. L'evaluation de l'effet de la geometriedu chantier sur des dommages fragiles du massif rocheux indique qu'independammentde la profondeur des chantiers, les chantiers presentant un rayon hydrauliquemodere et une pente elevee montre un plus granddommage fragile. Par contre, les chantiers avec les valeurs de rayon hydrauliquedu toit bas a modere, et un pendage de toit egalementbas a modere montrent une dommage fragile minimal. En outre, l'effet individuel et interactif des parametres geometriquesdu chantier sur les dommages fragiles du massif rocheux s'averesignificatif. L'evaluation de l'effet de la geometriedu chantier sur la probabilite de rupture en traction a montreque trois parametres, qui sont le rayon hydraulique du toit, la largeurdu chantier et le pendage de la paroi, ont une forte influence sur la stabilitedu chantier. Il a egalement ete constate que lePOF est controle de maniere significative par des effetsd'interaction entre la largeur du chantier / le rayon hydraulique dutoit, et le pendage du toit / le rayon hydraulique du toit. De plus, selonles resultats de l'optimisation mathematique, la stabilitemaximale (en termes de POF) se produit pour les chantiers etroits peuprofonds, a faible pendage et ayant de fortes valeurs de rayon hydrauliquedu toit. Alors que la stabilite minimale se produirait pour des chantierslarges et de pendage modere a eleve, avecun toit ayant faibles valeurs de rayon hydraulique. De plus, uneanalyse de stabilite probabiliste a ete est effectueesur sept chantiers principaux parmi les ouvrages souterrains situesaux niveaux V et VI de la mine souterraine Niobec (Saint-Honore, Quebec).Les methodes probabilistes utilisant le code de differencesfinies FLAC3D sont utilisees pour evaluer l'etatde stabilite de chaque chantier etudie, en tenant comptede la variabilite inherente associee aux parametresgeomecaniques de la masse rocheuse. L'etat de stabiliteest defini par les probabilites de rupture en traction et encompression (POF), et la probabilite d'initiation de degradationfragile (PDI). La simulation de Monte Carlo genere les parametresprobabilistes du massif rocheux tandis que les simulations aleatoiresde Monte Carlo ont applique une distribution spatiale aleatoiredes parametres geomecaniques dans le massif rocheux.Les resultats indiquent que pour les chantiers ouverts evalues,les ruptures de traction et de compression partagent des POF similaires. Cependant,selon les valeurs de PDI autour de tous les chantiers ouverts, aucune defaillancefragile ne devrait se produire dans les conditions existantes de la qualitedu massif rocheux et du regime de contraintes in situ aux niveaux Vet VI de la mine Niobec.
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