A simplified approach to assess seismic stability of tailings dams

Nimbalkar, Sanjay; Annapareddy, V. S. Ramakrishna; Pain, Anindya

doi:10.1016/j.jrmge.2018.06.003

Cited by 20 publications

(4 citation statements)

References 26 publications

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“…A reliable seismic slope stability analysis requires a relatively precise evaluation of seismic acceleration generated at different levels in the dam (Nimbalkar, Annapareddy & Pain 2018). Geotechnical engineers usually perform tailings dam's stability analysis, called pseudostatic approach, that employs a seismic coefficient under the load of a seismic event to calculate the factor of safety of a tailings dam (Ozkan 1998;Singh, Roy & Das 2007;Sousa, Ferreira & Gomes 2021).…”

Section: Introductionmentioning

confidence: 99%

Mining Induced Ground Motions in a Tailings Dam

Dias

Braga

Cunha³

et al. 2022

Anu. Inst. Geociênc.

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Mining induced seismicity can expose tailings dams to ground motions with potential to trigger a failure, if the structure reaches a certain level of vibrations that could exceed the seismic coefficient design criteria from pseudostatic analysis. Despite the cited risk, mainly for dams that are closer to open pits, few dams in Brazil are monitored by microseismic systems, and there are no references in the literature about continuous seismic monitoring both in open pit (source) and tailings dam, which represents the motivation of this paper. A microseismic system was commissioned in Cajati Mine, São Paulo, to record seismic events continuously in an array of 16 geophones (14 Hz and 4.5 Hz), installed in boreholes near the open pit (12 sensors) and in the dam (4 sensors), has measured values of PGA (Peak Ground Acceleration) and PGV (Peak Ground Velocity) related to 2,972 induced events from rock removal in the open pit. During the period monitored, the total of 109 events have triggered sensors in both structures, producing 920 seismograms, with the highest values of PGA and PGV of 0.0135 m/s2 (0.1358% of g) and 0.0892 mm/s. The highest PGA value is 36 times lower than the vertical coefficient of 3% of g defined by Brazilian technical standard to dam design criteria, normally used in common pseudostatic analysis from geotechnical engineers. A routine microseismic monitoring brings a new set of valuable actionable data and information to support the management of geotechnical tailings dams’ risks, under the conditions of vibrations induced by mining production.

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Section: Introductionmentioning

confidence: 99%

Mining Induced Ground Motions in a Tailings Dam

Dias

Braga

Cunha³

et al. 2022

Anu. Inst. Geociênc.

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“…Coarse granular aggregates, e.g., rockfill and ballast, have been widely used in constructing public facilities, due to its high mechanical qualities [1][2][3][4]. However, it has been long found that when subjected to external loads, particle breakage would occur in coarse aggregates, which significantly influenced the strength and deformation behaviour of the material [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Fractional Plasticity Model for Coarse Aggregates Incorporating Particle Breakage under Triaxial Loading

Yang

Sun

2021

Advances in Civil Engineering

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Fractional plasticity has been originally proposed for capturing the state-dependent nonassociated behaviour of sand, with no use of state variables and additional plastic potentials. However, for coarse aggregates, significant particle breakage would occur, which could influence the stress-strain behaviour of the material, by shifting the critical state line in the e − ln p ′ plane. In this note, an extension of the fractional plasticity for constitutive modelling of coarse aggregates is made by incorporating particle breakage under triaxial loading. The developed model is validated by simulating a series of laboratory test results of different coarse aggregates under triaxial loading, where a good agreement between the model simulations and test results is observed.

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“…Yang et al [14] found that the application of geotextile tubes in the construction of TD is a good alternative for fine tailings disposal. e impedance ratio and the depth of foundation have the significant effect on the seismic factor of safety of TD [15]. e Earth observationbased service could be used to forecast any potential risk from TDs several weeks in advance [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Shear Wave Velocity and Triaxial Mechanical Performance of Tailings Core from Tailings Dam

Luo

2021

Advances in Civil Engineering

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The physical and mechanical parameters of tailings are important to study the stability of tailings dams (TDs). In this study, a series of laboratory experiments (shear wave velocity, triaxial compressive, and peak strain strength testing) were conducted to obtain the mechanical properties of tailings from TD. The results showed the following. (1) The linear function fitting could characterize the quantitative relationship between shear wave velocity and hole depth. (2) The corresponding static pressure coefficient increased as the confining pressure increased. The exponential fitting could characterize the quantitative function relation between the static pressure coefficient and the confining pressure. (3) The cohesion and internal friction angle of the tailings sample were 20 kPa and 41°, respectively, and the logarithmic fitting could better characterize the quantitative relation between shear peak strength and confining pressure. The results of this study can provide important references for further research on the stability of TD.

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A simplified approach to assess seismic stability of tailings dams

Cited by 20 publications

References 26 publications

Mining Induced Ground Motions in a Tailings Dam

Mining Induced Ground Motions in a Tailings Dam

Fractional Plasticity Model for Coarse Aggregates Incorporating Particle Breakage under Triaxial Loading

Investigation on Shear Wave Velocity and Triaxial Mechanical Performance of Tailings Core from Tailings Dam

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