Guidelines and recommendations on minimum factors of safety for slope stability of tailings dams

Schnaid, Fernando; Mello, Luiz Guilherme F.S. de; Dzialoszynski, Bruno S.

doi:10.28927/sr.433369

Cited by 12 publications

(8 citation statements)

References 21 publications

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“…The general guidelines suggest the minimum values of FS as 1.3, 1.5 and 1.3 for the End of construction stage, steady seepage condition and sudden draw down condition respectively for the tailing dam design without seismic force. Considering seismic force the minimum FS may be 1.1 [16]. The values of FS for phase 1 and phase 2 dam constructions are observed to fall within these limits.…”

Section: Rapid Draw Down Conditionmentioning

confidence: 87%

Reuse of red mud in construction of tailing dam

Pavani

Jain

Das

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Red mud, a by-product of the alumina industry, is disposed through construction of clay lined dams or dykes. Into these constructions, red mud is pumped and allowed to dry naturally. This red mud when disposed is slurry with a solid concentration of 10%, high ionic strength and pH in the range of 10-13. It should be noted that it is toxic in nature at this stage because of the harmful chemical composition present in it. Hence utilization of it in various applications results in decrease of its environmental impact. In the present study, red mud has been used in the construction of a tailing dam. Its stability has been evaluated considering various cases such as end of construction, steady seepage, rapid draw down and seismic conditions. The data from this evaluation has been compared with borrowed soil to assess the compatibility of red mud. The comparison has shown that there is little difference between usage of either borrowed soil or red mud as tailing dam material. However, red mud gives better factor of safety compared to the borrowed soil considered in this study.

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Section: Rapid Draw Down Conditionmentioning

confidence: 87%

Reuse of red mud in construction of tailing dam

Pavani

Jain

Das

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Currently stable areas close to the unstable state (1 ≤ FS < 1.5-2) which require a more detailed and comprehensive investigation. This FS range was selected as a compromise between different approaches to separate between the stable and unstable state of the slope (Kramer 1996;Silva et al 2008;Stark and Ruffing 2017;Herza et al 2018; 1 3 Schnaid et al 2020). Parts of the slopes at St. Niklausen, Weggis, Kastanienbaum, and Muota sites belong to this group (Fig.…”

Section: Static One-dimensional Infinite Slope Stability Analysismentioning

confidence: 99%

“…Additionally, the minimum factor of safety (FS) which is considered a boundary between the stable and unstable states depends on the goals of a study. Generally, it is selected between 1 and 1.5 or even more (Kramer 1996;Silva et al 2008;Duncan et al 2014;Stark and Ruffing 2017;Herza et al 2018;Schnaid et al 2020).…”

Section: Slope Stability Analysismentioning

confidence: 99%

Geotechnical characterization and stability analysis of subaqueous slopes in Lake Lucerne (Switzerland)

et al. 2022

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Tsunamis occur not only in marine settings but also in lacustrine environments. Most of the lacustrine tsunamis are caused by seismically- or aseismically-triggered mass movements. Therefore, an assessment of the stability of subaqueous slopes is crucial for tsunami hazard assessment in a lake. We selected Lake Lucerne (Switzerland) as a natural laboratory to perform an in-depth geotechnical characterization of its subaqueous slopes. This lake experienced documented tsunamis in 1601 and 1687. Some of its slopes still bear sediment volumes with a potential for tsunamigenic failure. To identify such slopes, we interpreted available reflection seismic data and analyzed the bathymetric map. Then, we performed 152 dynamic Cone Penetration Tests with pore pressure measurement (CPTu) and retrieved 49 sediment cores at different locations in the lake. These data were used to characterize the failure-prone sediments and to evaluate the present-day static stability of subaqueous slopes. Obtained results allowed the definition of three classes of slopes in terms of static stability: unstable slopes, stable slopes close to the unstable state, and stable areas. Non-deltaic slopes with thicker unconsolidated fine-grained sediment drape and moderate-to-high slope gradients (> 5–10°) have the lowest Factor of Safety. In agreement with previous studies, the failure plane for the non-deltaic slopes is embedded within the fine-grained glaciolacustrine sediments. Deltaic slopes with prevailing coarse-grained sediments mostly appear statically stable. Finally, we generalized the measured undrained shear strength profiles $${s}_{u}(z)$$ s u ( z ) into the depth-dependent power-law models. These models define the $${s}_{u}$$ s u of Lake Lucerne’s sediments and can be applied to other lakes with similar sedimentation history.

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“…Thus, PF was calculated by 3519/10,000 = 0.3519 (35.190%) However, the safety factor was calculated by the probabilistic analysis with random variables in a critical scenario. The recommended international standard presents the minimum factor required for safety for embankments and foundations, which are 1.3 for endof-construction conditions and 1.1-1.2 for the rapid drawdown condition [29]. The sensitivity analysis results in Figures 8-10 were guidelines for improving the strength properties of the Bang-Ban-Bang-Sai Road embankment.…”

Section: Random Variables Without a Floodwatermentioning

confidence: 99%

Probabilistic Analysis of Slope against Uncertain Soil Parameters

et al. 2022

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The purpose of this article was to investigate the influence of uncertain soil parameters on slope stability problems using the probability method. The most important soil instability is probably the inherent spatial variability of soil properties and its influence on slope safety factors. The probability method is recognized for its validity both in practice and academic research. This method of geotechnical risk management involves uncertain parameters. In this study, randomly selected uncertain parameters were combined with traditional analysis using Bishop’s simple methodology and Monte Carlo simulation. The minimum safety factor and critical slip surface of the slope stability were analyzed by Bishop’s simple method. The influence of uncertain soil parameters was analyzed by the back analysis method with Monte Carlo simulation. The calculation was controlled by a critical slip surface, and the safety factor was equal to 1. The results of the analysis show the minimum safety factor and the significant slippery surface of slope stability with the original soil strength parameters. The new soil strength parameters were recommended by Monte Carlo simulation that was used for improving the soil strength parameters in construction. In addition, probability analysis can identify an insufficient understanding of groundwater level distribution and that the assumption of a uniform distribution increases the probability of failure. Governments can use the results of water level analysis in flood warnings and flood management projects to reduce risks to life and property.

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Guidelines and recommendations on minimum factors of safety for slope stability of tailings dams

Cited by 12 publications

References 21 publications

Reuse of red mud in construction of tailing dam

Reuse of red mud in construction of tailing dam

Geotechnical characterization and stability analysis of subaqueous slopes in Lake Lucerne (Switzerland)

Probabilistic Analysis of Slope against Uncertain Soil Parameters

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