WorldCat Identities

Gunzburger, Yann

Overview
Works: 16 works in 24 publications in 2 languages and 180 library holdings
Roles: Author, Editor, Thesis advisor, Opponent, Publishing director, Other
Classifications: HD9552.7.L6, 338.272850944
Publication Timeline
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Most widely held works by Yann Gunzburger
Le gaz de charbon en Lorraine : quelle intégration dans le territoire? by Yann Gunzburger( )

7 editions published between 2017 and 2019 in French and Undetermined and held by 161 WorldCat member libraries worldwide

Le méthane contenu dans le charbon a longtemps constitué un danger pour les exploitations minières (c'est le "grisou" des mineurs) du fait des risques d'explosion qu'il présente. Aujourd'hui, alors que le passé minier tend à s'effacer progressivement, ce gaz naturel pourrait être capté par forage depuis la surface pour servir de nouvelle source d'énergie. En Lorraine, cette perspective soulève de nombreuses interrogations, teintées tantôt d'enthousiasme, tantôt d'inquiétude. D'avril 2013 à décembre 2015, une équipe pluridisciplinaire de chercheurs et d'enseignants-chercheurs de dix laboratoires universitaires français et québécois ont conduit une action de recherche dénommée "GazHouille" portant sur le projet d'exploitation du gaz de charbon en Lorraine et son intégration dans le territoire. L'originalité de leur travail réside dans son caractère transverse, car il apporte des éclairages géographiques, géologiques, de psychologie sociale, économiques, juridiques, politiques, etc., permettant d'appréhender le projet d'exploitation dans plusieurs de ses dimensions. Cet ouvrage rend compte des résultats majeurs de leur étude. Il n'a pas la prétention d'être exhaustif, mais peut servir à alimenter un débat ou une consultation publique sur le thème de gaz de charbon en Lorraine, ainsi qu'à expliciter et formuler les interrogations soulevées par les perspectives de son éventuelle exploitation
Influence of expertise on rockfall hazard assessment using empirical methods by Adeline Delonca( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Rôle de la thermique dans la prédisposition, la préparation et le déclenchement des mouvements de versants complexes : exemple des Rochers de Valabre (Alpes-Maritimes) by Yann Gunzburger( Book )

2 editions published in 2004 in French and held by 2 WorldCat member libraries worldwide

Le versant des Rochers de Valabres a été le siège d'une importante chute de bloc dont nous nous attachons à décrire une cause potentielle, susceptible d'être à l'origine de nouveaux éboulements: en l'absence d'un facteur déclencheur manifeste, nous quantifions les effets des variations journalières de température de surface sur la stabilité de l'édifice de blocs qui constitue le versant. Ces effets, bien que faible magnitude, peuvent, en s'accumulant de jour en jour, jouer le rôle de facteur préparatoire des éboulements, comme le montre un modèle numérique dans lequel les variations en question entraînent la "reptation" progressive vers l'aval d'un bloc rocheux situé dans une configuration géométrique favorable. En outre, une partie du versant, utilisée comme site-laboratoire, a été équipée d'un dispositif d'auscultation tachéométrique de précision destiné à capter les mouvements d'origine thermique et dont les résultats sont comparés à ceux issus de la modélisation numérique
Impact of Geological Heterogeneities on Induced-Seismicity in a Deep Sublevel Stoping Mine by Francesca De Santis( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Auscultation d'un versant rocheux soumis aux sollicitations thermiques naturelles. Cas des Rochers de Valabres (Alpes-Maritimes) by Cécile Clément( Book )

2 editions published in 2008 in French and held by 2 WorldCat member libraries worldwide

The present work focuses on the monitoring of a rockslope, prone to instability, named “Rochers de Valabres”, subjected to natural thermal fluctuation at the rock surface. Thermal variations are supposed to be a preparatory factor for rockfalls. Their action is continuous, slow and imperceptible. This phenomenum is not widly studied and seldom quantified. As a first step, investigations, based on topographic survey using Lidar, stress measurements and laboratory testing, have been performed. They reveals parameters of the rockslope, as well as the stress field at shallow depths, characterized by high magnitudes, high turnover of the principal orientations and affected by topography and geological heterogeneities. Thermomechanical monitoring was performed by a network composed of strain cells and thermal sensors, deployed in boreholes. Thermal data give us information about thermal transfer, as a function of time or space. Strain variation data, although affected by thermal artefacts, give quantitative information on strains, equivalent stresses and depth of influence, on daily and seasonal basis. In order to evaluate the assumption of fracture propagation on thermal loading, an analytical model, based on fracture mechanic, is suggested. Using specific conditions and assumptions, this model reveals that measured stress and strains are sufficient to lead to propagation of pre-existing discontinuities. Consequently, this study confirms that thermomechanical variations can be considered as a non negligible preparatory factor for rockfall and can contribute to mechanical degradation of the rock masse and discontinuities
Origin of seismicity related to a flooded abandoned coal mining district at Gardanne, Provence, France by Dalija Namjesnik( )

1 edition published in 2021 in English and held by 1 WorldCat member library worldwide

The closure of mines and post-mining management nowadays present a major challenge as the problems that arise can greatly concern public security. When mines are abandoned, groundwater pumping systems are usually stopped and the water which progressively fills the remaining voids can affect the mechanical stability of underground structures. In general, mechanisms of observed seismicity in flooded, post-mining districts have been poorly understood. As a case study, this thesis focused on the abandoned, flooded coal mine in Gardanne, France, which has been experiencing significant post-mining seismicity problems. Seismic activity in Gardanne mine seems to originate from an interaction between rocks and fluids, as spatio-temporal distribution of events suggests the link with intense rainfall events as well as the active pumping. The knowledge on the origin and the triggering mechanisms of the seismic activity in Gréasque and Regagnas sector is the key for seismic hazard assessment of the entire Gardanne basin. Thesis work focused on questions concerning precise identification of seismic source origin evaluating two hypothesis, determination of the mechanism behind the seismicity, link between seismicity and the hydrogeological system, as well as improving of the detection and location of microseismicity with a sparse network. The new developed detection and location methodology adapts the full waveform-based method BTBB by Poiata by overcoming the challenges of the sparse seismic monitoring network, and includes a novel approach for noise removal from continuous dataset as well as location quality-based classification system. The seismicity clustering behaviour was indicated by the new seismic catalogue 2014-2017, which was further analysed more thoroughly. All results are in favour of the origin of the seismic sources on the fault below the mine. Spatial and temporal characteristics of observed seismic events and multiplet and repeater occurrences provided a clearer image of the active geological structures and allowed a preliminary interpretation of possible mechanisms affecting the initiation and driving of the repeating or after-shock like behavior of seismic events, based on comparison with available hydrological data. Despite the general understanding of the mechanism behind the seismicity, the maximum magnitude of the events that can be triggered is at this moment is difficult to quantify and predict due to limitations of available data. As a prospective, in order to better understand the seismic hazard, more accurate observations of the seismicity, mechanical parameters and water level changes in the seismically active zone are required to improve the understanding and the interconnection between these factors
La mine en France by Philippe Kister( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

L'ancrage territorial d'un projet d'exploitation de gaz de charbon au sein d'un espace en mutation : l'ancien bassin houiller lorrain by Yann Beauloye( )

1 edition published in 2020 in French and held by 1 WorldCat member library worldwide

En ce début de XXIè siècle, l'essor de la consommation et les limites des ressources énergétiques traditionnelles ont suscité un intérêt grandissant pour la recherche de nouvelles ressources gazières dites «non conventionnelles ». En Europe, ces nouveaux projets d'exploitation n'ont jusqu'à présent que rarement abouti, notamment à cause des craintes de dégradation de l'environnement qu'ils ont suscité auprès des populations des territoires concernés. L'hypothèse suivant laquelle le caractère agricole et touristique des territoires prospectés a contribué à l'échec de ces projets peut être testée en en prenant le contrepied. Un projet d'extraction de gaz non conventionnel peut-il plus facilement s'implanter dans un territoire marqué par une forte culture industrielle et une tradition d'exploitation des ressources du sous-sol ?C'est le cas de l'ancien bassin houiller lorrain où un nouveau projet d'exploitation de gaz de charbon tente de trouver sa place. Après avoir été lourdement impacté par la disparition des mines de charbon, mais également par la crise économique de 2008, ce territoire est en pleine mutation et doit désormais faire face à d'autres obstacles : le rétrécissement urbain, la métropolisation de la société et la progression de la concurrence des régions à aménités. Ces difficultés, partagées globalement par l'ancienne région Lorraine, imposent aux élus locaux de construire une solide stratégie de redynamisation traduite au sein des documents d'urbanisme et de planification. Cette stratégie repose notamment sur la construction d'une nouvelle image locale. Dans ce contexte, le projet d'exploitation de gaz de charbon, permettant un renouveau de l'exploitation du sous-sol à partir de nouvelles technologies, est présenté par le porteur de projet comme étant un potentiel levier local de redynamisation. Il pourrait aussi trouver sa place dans la transition énergétique locale, en contribuant à faciliter l'insertion des énergies renouvelables et à réduire les émissions carbonées du système énergétique. Dans cette vision, les intérêts de la firme et du territoire sont donc supposés se croiser.En s'appuyant sur les concepts d'acceptabilité sociale et d'ancrage territorial, cette recherche vise à étudier la compatibilité de ce nouveau projet minier avec les stratégies locales de développement. Par le biais de cette étude de cas, nous souhaitons par ailleurs analyser les apports du principe de « co-construction » des projets économiques, qui peuvent, et doivent être considérés comme étant des projets d'aménagement du territoire à part entière
Rôle de la thermique dans la prédisposition, la préparation et le déclenchement des mouvements de versants complexes exemple des Rochers de Valabre (Alpes-Maritimes) by Yann Gunzburger( )

1 edition published in 2004 in French and held by 1 WorldCat member library worldwide

The present dissertation describes a rockfall that has affected the Rochers de Valabres slope and discusses one possible mechanism for its occurrence, along with the potential for future ones. ln the absence of an obvious explanatory trigger factor, we set out to examine whether natural daily surface temperature changes could have played a role in this event. ln particular, it is suspected that these slight, yet repeated, perturbations may be a preparatory factor for rockfalls, with a day-to-day cumulative effect. A numerical model strengthens this hypothesis by showing that thermally-induced deformations can be sufficient to cause the graduai downward creep of rock blocks located in an awkward position. To investigate this notion more thoroughly, a currently-vulnerable part of the slope has been instrumented with a high-precision geodetic monitoring system to capture thermally-induced movements. Measured data are compared herein with numerical modelling results
Les incertitudes lors de l'évaluation de l'aléa de départ des éboulements rocheux by Adeline Delonca( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

The present dissertation proposes to study uncertainties in rockfall hazard assessment process, on the basis of the Baecher & Christian typology (2005), which identifies (1) decision uncertainties, (2) knowledge uncertainties, and (3) natural variability. Decision uncertainties are due to the subjectivity of experts' assessment. An experiment has been realized in order to evaluate the influence of the expertise level, and the chosen method (qualitative or quantitative) on the rockfall hazard. The rockfall hazard levels obtained by the qualitative method are quite uniform while the quantitative method produces more disparate results. We have shown that, classically, the expertise level has no influence on the assessment if the method is precisely detailed. In the case of spectacular sites, experts do not overestimate the hazard. The natural variability is associated to the temporal variability of the rockfalls. We have studied the statistical correlation between meteorological and rockfall databases. We have developed a method that takes into account the probability of occurrence of the studied triggering factor (rainfalls and temperatures). This new approach is easy to use, and also helps to determine the conditional probability of rockfall according to a given meteorological factor. This approach will help to optimize risk management in studied areas based on their meteorological conditions. A work on these databases also has allowed the unpredictability of the rockfalls to be highlighted. Indeed, the delay between two rockfalls follows a Poisson distribution. Knowledge uncertainties may concern the preparatory factors. We have studied them with numerical models of a rock block sliding along a planar joint, depending on the proportion and position of rock bridges (distinct elements - UDEC). Two stages of the failure process have been highlighted; they have been controlled by the stress redistribution induced by the failure, and the propagation of the rock bridges. However, these two phases are not identified when studying block displacements. We also have shown the influence of the position of rock bridges on the propagation of failure. This research provides an operational tool, and guidelines on assessment process that may help engineers in charge of a rockfall risk analysis to justify and refine the obtained risk estimations
Interprétation de mesures de déformation en forage en terrain anisotrope : retour d'expérience de l'utilisation de cellules CSIRO dans l'argilite de Tournemire (Aveyron) by Abdelmonem Ben Ouanas( )

1 edition published in 2010 in French and held by 1 WorldCat member library worldwide

En géomécanique, la caractérisation de l'état de contrainte et de la rhéologie d'un massif rocheux peut être obtenue en mesurant la réponse en déformation du terrain sous l'effet d'une sollicitation connue. Une méthode parmi d'autres consiste à recourir pour cela à une cellule de mesure intégrée (comportant des capteurs de déformation orientés selon différentes directions) installée dans un forage et rendue solidaire du massif par l'intermédiaire d'une colle époxy. Ce principe de mesure est utilisé, notamment, pour déterminer l'état de contraintes in situ par la méthode dite de « surcarottage » et les caractéristiques élastiques de la roche à partir de l'essai « biaxial ».Entre novembre 2005 et janvier 2006, une campagne d'essais géomécaniques de ce type a été menée dans l'argilite de Tournemire (Aveyron, France), à l'aide des cellules CSIRO. Les mesures de déformation obtenues ont révélé des phénomènes inhabituels qui ont rendu délicate la détermination des caractéristiques élastiques anisotropes de la roche et impossible l'accès aux contraintes du site.La présente thèse a pour objectif de contribuer, par la recherche d'explications à l'origine de ces phénomènes, d'une part, à l'amélioration de la connaissance du comportement de l'argilite de Tournemire et, d'autre part, à l'amélioration du protocole de mesure et d'interprétation de déformations obtenues par cellules CSIRO.Notre démarche consiste, dans un premier temps, à émettre un certain nombre d'hypothèses explicatives des phénomènes observés par la recherche bibliographique. Dans un deuxième temps, nous testons ces hypothèses à travers la modélisation analytique et numérique des essais de surcarottage et biaxiaux, puis à travers la réalisation de nouvelles expérimentations in situ et en laboratoire sur l'argilite, mais aussi sur des matériaux-tests (ciment, échantillon de colle).Nous concluons que les phénomènes inhabituels observés résultent, pour l'essentiel, des conditions de mise en œuvre in situ des cellules CSIRO. En particulier, nous mettons l'accent sur les artéfacts induits par le comportement visco-plastique de la colle époxy lorsqu'elle n'est pas parfaitement polymérisée. Le rôle de l'endommagement de la roche généré par les opérations de forage est également discuté. Nous en tirons des recommandations pratiques pour la réalisation de nouveaux essais dans des conditions similaires
Estimation et évolution des vides miniers aux Mines Domaniales de Potasse d'Alsace (MDPA) par mesures géodésiques et modélisation géomécanique by Guillaume Modeste( )

1 edition published in 2020 in French and held by 1 WorldCat member library worldwide

Les Mines Domaniales de Potasse d'Alsace sont sujettes à un ennoyage tardif, conséquence de l'extraction du minerai. L'eau suinte le long des puits miniers rebouchés, emplissant les vides résiduels et perturbant la mécanique du milieu. L'estimation des vides miniers est alors d'un intérêt de premier ordre. La technique InSAR est appliquée pour étudier l'évolution des affaissements miniers en lien avec la compaction des matériaux foudroyés. En traitant les archives d'images SAR de 1995 à 2018, les déplacements verticaux annuels passent de l'échelle centimétrique à millimétrique et les déplacements sont encore détectables près de 20 ans après la fin des ravaux. En complément, des mesures lidar sont menées dans des galeries de sel à 550 m de profondeur pour caractériser le comportement mécanique du massif. L'ensemble des études et observations passées du bassin potassique alsacien concernant sa géologie et son champ de contraintes ambiant sont synthétisées au sein d'un modèle équivalent. En combinant ce modèle à nos données, nous estimons des vides résiduels dans certains secteurs, de l'ordre de 20% en 2020, avec une vitesse de fermeture tendant vers 0.1%/an
La rupture brutale des piliers conditionne-t-elle les effondrements miniers ? : approches énergétiques par modélisation numérique by Thomas Hauquin( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

At different locations around the world, the room-and-pillar mining method truns out to be associated with two major types of hazards affecting the surface: the continuous subsidence and the sudden collapse. The Lorraine iron basin (France) have known on many occasions both continuous subsidences and sudden collapses, notably since the decline of the French mining activity in the 1960's. The collapses are more dangerous than the continuous subsidences. This is why researchers and engineers developed statistical methods capable of distinguishing between the sectors subjected to a collapse hazard and those subjected to a continuous subsidence hazard. The objective of that study if to develop indicators capable of making the same distinction but on the basis of mechanical criteria, for the purpose of improving the understanding of the collapse mechanism and for validating the statistical indicators. The main assumption of this work is that both the continuous subsidences and the collapses are caused by damage of the pillars within the mines. Chapter 1 presents a literature review concerning the actual knowledge about the pillars mechanical behaviour. We notice that pillars are traditionally characterized by two criteria: the factor of safety (pic compressive resistance/average vertical stress), which determines whether or not pillars are susceptible to fail, and a criterion of stability in case of a failure, which consists of comparing the flexural stiffness of the surrounding rock to the pillars axial stiffness in the post-pic domain of their behaviour. We identify two limits regarding the traditional approaches: i) The question of the average vertical stress has only been little studied in the case of pillars with irregular geometry, which is often the case in old mines; ii) The model allowing to estimate whether or not an instability is susceptible to occur comes from a 1D model proposed in the 1960's and that has never been developed furthermore for being applied to real configurations in various geomechanical conditions. In Chapter 2, we develop a new method for taking the irregularity of the pillars dimensions into account in estimating their average vertical stress, for the purpose of having a better precision in the factor of safety calculation. We introduce the concept of relative extraction ratio and show, on the basis on numerical modelling, that a quadratic function of this ratio is more precise in estimating the average pillar stress than the classical tributary area method.Chapter 3 is devoted to the development and the application of an original explicit method for modelling pillar instability based on the kinetic energy. We show that the numerical results obtained in 2D configurations are compatible with the traditional 1D model of pillar instability. Moreover, we show how the modelling method we are using helps to locate and to quantify the kinetic energy in excess induced by the instability. The magnitudes of modelled kinetic energies are similar to Richter magnitudes of typical seismic energies recorded during real pillar bursts. The problem of the Lorraine iron basin collapses is treated in Chapter 4. Based on 3D modelling results, we show that pillar failure and instability criteria are capable of well distinguishing between the sectors affected by collapses and those affected by continuous subsidences in the iron basin. Both the sectors subjected to collapses and continuous subsidences are characterized by a factor of safety lower than one regarding the limit of elasticity. But the collapsed sectors are distinguished by a factor of safety also lower than one regarding the pic compressive resistance. This observation is confirmed by simplified 2D modelling, which suggests, furthermore, that the properties of the overburden have no effect on the occurrence of the collapses. Some studies provide contrary conclusions. So, we propose some points to be discussed
Mining risk assessment at the territory scale : development of a tool tested on the example of gold mining in French Guiana by Ottone Scammacca( )

1 edition published in 2020 in English and held by 1 WorldCat member library worldwide

Mining can be the source and target of opportunities and threats of different natures exceeding the mine-site perimeter, affecting the socio-ecological system where mining is performed and leading to social tensions and entrepreneurial risks for mining companies. Hence, a mining project is a matter of land-planning rather than a simple industrial object. Nevertheless, current mandatory risk and impact assessment methods are often performed on one project at a time, sometimes neglecting the cumulative dimension of risks, the great variability of coexistent mining activities, and the socio-ecological vulnerability in which mining is performed. This thesis proposes an approach to develop and compare, based on the assessment of their risk, different potential scenarios for land-planning strategies in mining territories. This approach is operationalized through the development of a framework via its application on French Guiana gold mining sector. Here, gold mining involves a great variety of forms and techniques in a very sensitive socio-ecological context. Five territorial mining scenarios (TMS) involving different mine-types (e.g. legal artisanal, medium, large scale mining, illegal mining) are developed for the same amount of gold production. For each TMS, two types of risk scenarios are distinguished whether they concern the normal or accidental (e.g. dam failure) functioning of the mining project(s). Risks are assessed through a GIS-based approach that consider the socio-ecological vulnerability of the territory where the mines are located. The TMS are finally weighted, discussed and compared based on a global risk score. Despite the reliability of its results, this thesis provides an original and adaptable approach for the rapid comparison of mining strategies at the territory level, based on risk assessment. Further developments need to be achieved in order to optimize and improve the proposed approach and its application to the selected case-study (e.g. integration of the uncertainty analysis, better probabilistic models, data availability, GIS-automated tools)
Rock mass mechanical behavior in deep mines : in situ monitoring and numerical modelling for improving seismic hazard assessment by Francesca De Santis( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

With the aim of better understanding interactions between stress modifications induced by mining and the generation of seismic activity, a deep area of Garpenberg mine (Sweden) was instrumented by Ineris with microseismic probes and geotechnical cells. Spatiotemporal analysis of recorded seismicity between 2015 and 2016, as well as seismic source parameters, have highlighted two types of seismic rock mass responses: one local and temporally short directly induced by production blasts, the other long-lasting over time and remote from excavations being mainly controlled by geological heterogeneities. Geotechnical data analysis showed the occurrence of aseismic deformations, as well as creep phenomena induced by mining exploitation. In addition, seismic activity decays proportional to the decaying rate of measured strains. This latter observation implies that creep may be another mechanism driving seismicity, in addition to the immediate stress change induced by blasting. In the last part of this thesis, a 3D elasto-plastic geomechanical model has been realized and its results have been compared with geophysical data. This comparison showed that mine-wide numerical models can be suitable for the analysis of mining induced seismicity at large-scale. However, there are some aspects of the induced seismicity that the model cannot fully explain. This is particularly true for remote seismicity occurring at a distance from excavations, while better correlations are found when considering seismicity close to production areas. Results of this thesis demonstrated that a combined approach which associates seismic and geotechnical data with numerical modelling can significantly improve our understanding of the rock mass response to mining. The combination of these methodologies in an integrated approach can significantly reduce their straightforward limitations, which appears evident when these instruments are considered separately
Numerical modeling of stress redistribution to assess pillar rockburst proneness around longwall panels : Case study of the Provence coal mine, France by Samar Ahmed( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Rockburst is a violent explosion of rock that can occur in underground mines. In the current research, the main objective is to demonstrate the causes that may influence the rockburst proneness by using the numerical modeling tool. However, firstly, the pre-mining stress state and the induced stresses due to surrounding excavations have to be studied precisely. The Provence coal mine, where a rockburst took place in its shaft station that is surrounded by many longwall caving panels, has been chosen as a case study. A large-scale 3D numerical model has been constructed to include the shaft station area with its small-scale pillars and galleries, and the large-scale longwall panels with their accompanying goaf area. Many problems appeared while developing such large-scale numerical model, the first problem was the initialization of stress state at a large-scale, where the measured vertical stresses are in disagreement with the overburden weight, and the in-situ stresses are highly anisotropic. The second problem was the simulation of the goaf area accompanying longwall panels. The third problem was the assessment of pillars instability in terms of its strength/average stress ratio, and its volume. The Fourth problem was the assessment of rockburst proneness in the shaft station based on different rockburst criteria. Five methods were developed to initialize the heterogeneous pre-mining stress in the large-scale numerical model. These methods are based on the Simplex Method, which is mainly based on optimizing the difference between the in-situ measured stress values and the numerical stress values to develop stress gradients able to express the stress heterogeneity and compatible with the in-situ measurements. The method that is based on initiating the stress state with 3D stress gradients was found to be more efficient than the traditional method that is based on the horizontal-to-vertical stress ratios. Regarding the goaf simulation, three models were developed and implemented in the numerical model to express the mechanical behavior within the goaf area above longwall panels. Two of these models are based on an elastic behavior, and the third one is based on the strain-hardening elasto-plastic behavior that takes the consolidation phenomenon into consideration. It was found that the goaf area above longwall panels could reach up to 32 times the seam thickness, and the elastic modulus of caved area (the first few meters in the goaf area) did not exceed 220 MPa to fulfill the roof-floor convergence. But, with advance of the exploitation, this soft material consolidated under the pressure of the overlying strata. In case of critical and super-critical width, the vertical stress in the goaf area exceeded the overburden weight, and it increased up to 4 times the overburden weight on the rib-sides. The vertical stress increased in the shaft station pillars as a result of exploiting the nearby longwall panels. It was found that the pillar volume plays an important role in its stability. And, the strength/stress ratio was found to be insufficient to quantify the rockburst proneness in underground mines. Many rockburst criteria were implemented in the numerical model to assess the rockburst proneness. It was found that the criteria that are based on stress and strain changes were able to assess the rockburst proneness
 
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