The damage-failure criteria for numerical stability analysis of underground excavations: A review

Heidarzadeh, Shahriyar; Saeidi, Ali; Rouleau, Alain

doi:10.1016/j.tust.2020.103633

Cited by 22 publications

(13 citation statements)

References 59 publications

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“…To avoid the disadvantages of empirical stability graph methods, many numerical modelling studies have been carried out to estimate ore dilution and HW overbreak using site-specific geometric and geotechnical data of mines. However, most early modelling studies, as well as current work, only focus on the stope overbreak assessment of an isolated type stope with no previous mined-out areas (Urli & Esmaieli, 2016;Heidarzadeh et al,2019;Vallejos & Díaz, 2020;Hefni et al, 2020). Alternatively, the stope overbreak is not actually modelled during stoping simulation, e.g., overbreak areas attach to stope wall rather than being mucked out in the modeling (El Mouhabbis et al, 2009).…”

Section: Proposed Numerical Modelling Methodologymentioning

confidence: 99%

Strategies for surface crown pillar design using numerical modelling – A case study

Chen

Mitri

2021

International Journal of Rock Mechanics and Mining Sciences

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Section: Proposed Numerical Modelling Methodologymentioning

confidence: 99%

Strategies for surface crown pillar design using numerical modelling – A case study

Chen

Mitri

2021

International Journal of Rock Mechanics and Mining Sciences

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“…Various researchers have adopted convergence indices to judge the failure or ultimate/serviceability limit state of the excavation (e.g. Heidarzadeh et al, 2021;Zhang and Mitri, 2008;Abdellah et al, 2018). Convergence ratio i.e.…”

Section: Convergencementioning

confidence: 99%

Modelling of sensitivity of underground space stability to the in situ stress uncertainties: case study at the Bukov underground research facility phase II (Rozna mine, Czechia)

Gong¹

2021

Acta Geodynamica Et Geomaterialia

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Numerical modelling has been widely used in the underground excavation design, where the in situ stress state plays a crucial role in the stability analysis. However, determination of an exact stress state for a specific geological region remains uncertain due to the complicated tectonic nature and measurement limitations. The stability is thus better analysed by considering the in situ stress as a finite spectrum and pinpointing the possible worst-case scenario. The most probable scenarios of in situ stress states in the Rožná mine area were analysed based on the varying trends in principal stress ratio and mean stress values obtained from four different measurement/analysis campaigns. The influence of different in situ stress judgement on the deformation and failure characteristics of the Bukov Underground Research Facility (URF) (Phase II, Czech) were investigated by the finite volume program FLAC3D. Results show that the increased horizontal stress anisotropy and the mean stress level jointly increase the overall deformation and lower the URF stability. Such influences on the roadway horizontal convergence are more considerable than the vertical ones. A mathematical model considering mean stress and horizontal stress ratio was proposed to quantitatively describe the overall stability, especially useful for excavations possessing complicated configuration.

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“…The choice of failure criteria in the numerical analysis of stability plays an important role in determining the stability of underground workings. The failure criterion will only be useful if it is selected based on the correct failure mechanism [59,60]. The accuracy of the study of numerical modeling will depend on the correct choice of the deformation criterion, the adequate formulation of the problem and the quality of the initial data [61,62].…”

Section: Introductionmentioning

confidence: 99%

Instability Assessment of Hanging Wall Rocks during Underground Mining of Iron Ores

et al. 2021

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The paper presents the study of the deformation processes development in unstable rocks of the hanging wall during mining a thick steeply dipping ore deposit in the example of the Yuzhno-Belozerskyi deposit. In the studied field, there are problems of stability of hanging wall rocks, represented by low-resistant shale rocks that do not withstand significant outcrops in time. A decrease in stability is manifested in the form of failure of the hanging wall rocks into the stope. Based on a detailed study of the ore deposit geological structure and the performance of the stopes mining, according to the survey data, an area of the deposit has been identified where the ore failure and dilution reach 4%–8% with a maximum value of 12%. This also makes it possible to determine the most important averaged source data for performing physical modeling on equivalent materials. It has been determined that the deformation value of the hanging wall rocks with subsequent failure into the stope and ore mass deformation in the sloping bottom change exponentially with an increase in the depth of the stope location, and the dynamics of increasing rock deformations in the hanging wall is noticeably higher than in the sloping bottom of the stope. This reduces the quality of the mined ore and increases the probability of rock failure area propagation to the hanging wall drifts with their subsequent destruction. The results of physical modeling are characterised by acceptable reliability and are confirmed by a high similarity with the actual data on ore dilution with broken rocks during the stopes development. It has been found that during the formation of a steeply dipping outcrop of stopes with an area of 1200 m2, unstable rocks of the hanging wall are prone to failure of significant volumes. For successful mining and achieving stope element stability, it is recommended to optimise its parameters, the height, width and the value of a steeply dipping outcrop, as well as to preserve the ore pillar in the hanging wall until the ore is broken and drawn from the rest of the stope.

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The damage-failure criteria for numerical stability analysis of underground excavations: A review

Cited by 22 publications

References 59 publications

Strategies for surface crown pillar design using numerical modelling – A case study

Strategies for surface crown pillar design using numerical modelling – A case study

Modelling of sensitivity of underground space stability to the in situ stress uncertainties: case study at the Bukov underground research facility phase II (Rozna mine, Czechia)

Instability Assessment of Hanging Wall Rocks during Underground Mining of Iron Ores

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