3D large-scale numerical model of open-pit lake slope stability—case study of Lake Most

Renaud, Vincent; Heib, Marwan Al; Burda, Jan

doi:10.1007/s10064-022-02771-3

Cited by 9 publications

(10 citation statements)

References 41 publications

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“…They comprise clays and sandy-clays with variable carbonate occurrence. These sediments can be classified into two primary geotechnical soil types [5] (Figure 1). The first one (in situ soils) corresponds to a clay layer and coal seam, sandy clays (PJIL layer), three plastic clay layers (JIL1, JIL2 and JIL3), and the Quaternary gravel layer.…”

Section: Study Areamentioning

confidence: 99%

“…The second group, corresponding to dump materials produced by the mining operation, is a complicated heterogeneous system. For the stable calculations, it was divided into the following geotechnical units [5]:…”

Section: Study Areamentioning

confidence: 99%

“…The creation of artificial lakes by flooding former open pit mines has become the most common strategy for the long-term rehabilitation of abandoned mine sites [1][2][3][4][5]. The forming lakes constitute important sites of culture and recreation.…”

Section: Introductionmentioning

confidence: 99%

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Pit Lake Slope Stability under Water Level Variations

Steiakakis,

Syllignakis,

Galetakis

et al. 2024

Geosciences

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This paper presents the results of a geotechnical investigation regarding the slope stability in a pit lake, emphasizing the impact of water level variations. Advanced analysis techniques were utilized for this study. The research was performed by using fully coupled flow-deformation analyses. For the fully coupled approach, Bishop’s effective-stress equation was used, and for the description of soil hydraulic behavior, the Van Genuchten’s model was applied. The analysis of slope stability associated with reservoir water level changes revealed that the slope tended to become unstable as the water level decreased; the stability factor was negatively related to the rate of water level reduction. Concerning the water level fluctuations, the analyses revealed that the soil mass seemed to become less stable as the rate of water level change increased. Under a specific range of rates of water level variation, the safety factor became higher as the number of fluctuations increased. Additionally, the simulation results concerning the water level rising indicate that the pressure due to the external water level acts on the slope surface with a positive impact on the stability factor. The results obtained reflect the effects under a specific site condition, but they can be used as a reference for evaluating slope stability in a pit lake design.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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Pit Lake Slope Stability under Water Level Variations

Steiakakis,

Syllignakis,

Galetakis

et al. 2024

Geosciences

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“…corresponding to low hazard. Additionally to qualitative assessment, an advance risk assessment was carried using 3D -large scale numerical modelling, considering the geology and the presence of a weak layer (Renaud et al, 2022). The weak layer has very low friction angle.…”

Section: Lake Case Studymentioning

confidence: 99%

A framework for assessing hazards related to pit lakes – application on European case studies

Heib

Varouchakis

Galetakis

et al. 2023

Preprint

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The number of abandoned mines is continuously increasing in the word. The sustainable exploitation of these abandoned mines is a top priority globally. Open-pit lakes created in the abandoned mining site provide benefits and present risks for the mining region. The paper presents a methodology to assess the hazards (mining and natural). The proposed methodology framework is based on well-established and internationally accepted risk management standards and allows the assessment of the long-term stability of pit lakes. Ground movement, water pollution, fire hazards are presented, and their impact evaluated based on feedback and international experiences. The methodology was applied for 13 European open-pit lakes created in former European coal and lignite mines. A risk assessment of Most lake, using qualitative and a weighted probabilistic approach that considers the overall and the individual effect of identified mining and natural hazards, shown that the main potential hazards are the ground movement and the flooding.

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“…The research focused on the Oltetu open-pit and was directed in such a way as to allow consideration in the stability analyses of natural (predisposing the investigated area to landslides) and anthropogenic (speci c to open-pit mining) factors and causes as well as their combined effect (Lazar 2022). The large-scale numerical model was built, based on the site observations, large scale LiDAR data, in situ characterisation tests, and statistical analysis of geotechnical data, on DTMs de ning the complex geology of the site and local and global safety factor were calculated using the strength reduction method (Renaud 2022). Computer modelling and analysis of the slope models were performed using Slide (v.5.0) and Phase2 (v.6.0) software.…”

Section: Introductionmentioning

confidence: 99%

The influence of loose layer water cut-off curtain on the slope stability of open-pit coal mines

Wang

2023

Preprint

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Water-rich open-pit mines in China face the problems of large water inflow, slope reinforcement difficulties and high mining risks. The construction of a water cut-off curtain to control groundwater in the loose layer of open-pit mines can effectively reduce the amount of water drainage, thus solving the problem of flooding in open-pit mines. However, the rise of the water level outside the curtain and the change in the geotechnical properties of the slope will affect the stability and safety of the slope of the open-pit mine. A computational model was constructed, and the limit equilibrium method and numerical simulation method were used for calculation and analysis to study and analyse the influence law of the water cut-off curtain of the loose layer on the stability of the slope. The research results show that under the effect of the water cut-off curtain, the water level on the outside of the cut-off curtain in the loose layer of the open-pit mine continues to rise, and the hydrostatic pressure and horizontal thrust of the slope body increase. As a result, the sliding force of the slope increases and the anti-skid force decreases, ultimately leading to a decrease in the slope stability coefficient of the open-pit. Assuming that the water level outside the curtain remains unchanged, if the construction position of the curtain is moved outwards, the stability coefficient of the slope will increase; conversely, if the position of the curtain is moved inwards, the stability coefficient of the slope will decrease. The maximum shear stress on the slope increases as the water level outside the water curtain rises. The maximum shear stress is mainly concentrated at the toe of the slope of the first platform below the surface and at the interface between the curtain and the bottom of the Quaternary System. The water curtain can control the water table. The water cut-off curtain can control the groundwater level of the slope and maintain slope stability.

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3D large-scale numerical model of open-pit lake slope stability—case study of Lake Most

Cited by 9 publications

References 41 publications

Pit Lake Slope Stability under Water Level Variations

Pit Lake Slope Stability under Water Level Variations

A framework for assessing hazards related to pit lakes – application on European case studies

The influence of loose layer water cut-off curtain on the slope stability of open-pit coal mines

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