Gold tailings liquefaction under critical state soil mechanics

Bedin, J.; Schnaid, Fernando; Fonseca, A. Viana da; Filho, L. de Moura Costa

doi:10.1680/geot.10.p.037

Cited by 71 publications

(39 citation statements)

References 12 publications

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“…Been et al (1991) reported the existence of a bilinear critical state line (CSL) for drained and undrained shearing of sands, and Yamamuro and Lade (1996) showed that the sharp change in slope in the CSL observed was associated with a larger incidence of particle breakage. Similar observations were also reported by Bedin et al (2012) for mine tailings. In addition, Russell and Khalili (2004) identified a third linear segment of the CSL in which compression was the governing deformation mechanism.…”

Section: Introductionsupporting

confidence: 91%

“…In addition, while a single transition in slope in the CSL of other granular materials has been attributed to particle breakage or crushing from a qualitative standpoint, i.e. gold tailings at ′ = 225 (Bedin et al, 2012) and cambria sand at ′ = 4 (Yamamuro and Lade, 1996), only limited studies have demonstrated quantitatively the effects of breakage. Another aspect illustrated in Fig.…”

Section: Stress-strain Behaviour and Associated Breakagementioning

confidence: 99%

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Drained and Undrained Shear Behavior of Compacted Coal Wash

Heitor

Indraratna

Kaliboullah

et al. 2016

J. Geotech. Geoenviron. Eng.

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Coal wash is a granular waste material that is readily available in the vicinity of coal mining operations. While its potential use in structural fills has been recognized in the past, the effects of particle breakage on the geomechanical performance of the material have not been thoroughly investigated. In this paper, an experimental study on a selected coal wash is undertaken to characterize the influence of compaction and particle breakage on its corresponding stress-strain behavior. Particular emphasis is given to the role of compaction energy level and associated breakage incurred during compaction on the drained and undrained shearing behavior. The incidence of particle breakage for undrained and drained shearing was observed to be different, which in turn had a strong influence in the yielding behavior and the critical state. Furthermore, the critical state conditions for coal wash seem to be better described through a three-dimensional surface incorporating the effect of breakage. AbstractCoalwash is a granular waste material that is readily available in the vicinity of coal mining operations. While its potential use in structural fills has been recognised in the past, the effects of particle breakage on the geomechanical performance of the material have not been thoroughly investigated. In this paper, an experimental study on a selected coalwash is undertaken to characterize the influence of compaction and particle breakage on its corresponding stress-strain behaviour.Particular emphasis is given to the role of compaction energy level and associated breakage incurred during compaction on the drained and undrained shearing behaviour. The incidence of particle breakage for undrained and drained shearing was observed to be different, which in turn had a strong influence in the yielding behaviour and the critical state. Furthermore, the critical state conditions for coalwash seem to be better described through a three dimensional surface incorporating the effect of breakage. CE Database subject headings: coalwash; compaction; particle breakage; undrained and drained shear behaviour 23

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Section: Introductionsupporting

confidence: 91%

Section: Stress-strain Behaviour and Associated Breakagementioning

confidence: 99%

Drained and Undrained Shear Behavior of Compacted Coal Wash

Heitor

Indraratna

Kaliboullah

et al. 2016

J. Geotech. Geoenviron. Eng.

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“…Russell and Khalili (2004) described the behaviour of crushable granular materials using a three-segment CSL within a boundary surface constitutive model. Bedin et al (2012) through a series monotonic triaxial testing on gold tailings observed a highly non-linear shape of CSL and stated that the curvature was due to particle breakage. Daouadji et al (2001) represented the position of the CSL in terms of the amount of energy needed for grain breakage, showing that the CSL in the e-lnp' domain descends according to the evolution of particle gradation.…”

Section: Introductionmentioning

confidence: 99%

Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage

2015

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A substantial amount of experimental evidence suggests that the critical state envelope for ballast is nonlinear, especially at low confining pressure. To study the implications of this nonlinearity and the associated role of particle breakage, monotonically loaded drained triaxial tests were conducted using a large-scale cylindrical triaxial apparatus. A nonlinear critical state envelope is determined in the q-p= and -lnp= planes. Mathematical expressions for critical state stress ratio and specific volume are proposed to incorporate the evolution of particle breakage during monotonic shearing. In this paper, an elastoplastic constitutive model based on the critical state soil mechanics framework is presented to capture the salient aspects of stress-strain behaviour and degradation of ballast. Constitutive parameters were conveniently determined from large-scale laboratory tests. The model is able to predict the monotonic shear behaviour of ballast corroborating with the laboratory measurements. The proposed model is further validated using experimental results available from past independent studies. Disciplines Engineering | Science and Technology Studies Publication DetailsIndraratna, B., Sun, Q. & Nimbalkar, S. (2015). Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage. Canadian Geotechnical Journal, 52 (1) Abstract: A substantial amount of experimental evidence suggests that the critical state envelope for ballast is non-linear, especially at low confining pressure. In order to study the implications of this non-linearity and the associated role of particle breakage, monotonically loaded drained triaxial tests were conducted using the large-scale cylindrical triaxial apparatus. A non-linear critical state envelope is determined in the q-p' and  -lnp' planes.Mathematical expressions for critical state stress ratio and specific volume are proposed to incorporate the evolution of particle breakage during monotonic shearing. In this paper, an elasto-plastic constitutive model based on the critical state soil mechanics framework is presented to capture the salient aspects of stress-strain behaviour and degradation of ballast.Constitutive parameters were conveniently determined from large-scale laboratory tests. The model is able to predict the monotonic shear behaviour of ballast corroborating with the laboratory measurements. The proposed model is further validated using experimental results available from past independent studies.

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“…The influence of atmospheric rainfall on the dam seepage is obvious, the heavier the rainfall, the higher the infiltration line, the more disadvantageous to the dam stability [9]. Tailings are non-sticky or less viscous bulk soils, which are easily led to be liquefied [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study on tailings dam over-topping failure model test and break mechanism under the rainfall condition

Wang

Jing-wen

et al. 2017

Teh. vjesn.

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Original scientific paper Based on self-designed tailings dam simulation experiment device of tailings dam-break, experimental study of tailings dam failure was carried out under the condition of rainfall. The change rule of infiltration line, the developing process, the mechanism of dam failure and the displacement of the dam body after collapse were obtained and recorded by the rainfall devices, the infiltration line measuring devices, the displacement monitoring devices and the camera. The results are as follows: in the early stage of rainfall, the changes of the infiltration line in the front reservoir and the outside slope of the dam were obviously lagging behind the water level, but in the middle and tail of the reservoir it was not obvious. In the later stage of the rainfall, the lagging phenomenon gradually disappeared, and the change of water level had an obvious effect on the change of infiltration line. At the early stage of the dam failure, seepage and water overflow occurred on the outer slope of the tailings dam, causing local collapse to occur. In the late stages of dam break, the water flew over the dam crest and continued to erode the dam body, thus lead to the dam failure. Under the action of seepage force, the phenomenon of piping occurred in the dam. With the continuous erosion of water flow, the seepage force, floating severe, buoyancy force and pore water pressure were increased, the anti-resistance was weakened and the stability of dam was reduced. After the dam failed, the settlement displacement in the breach was the largest, in addition to the breach, the settlement displacement occurred mainly at the dam abutment. The external expansion occurred mainly in the middle dam and dam foot. The research results provide some valuable guidance and reference for the mechanism analysis of the tailings dam-break, the disaster prevention and controlling when subjected to rainfall. Keywords: anti-resistance; model test; overtopping dam-failure; upstream-type tailings dam Studija o ispitivanju modela oštećenja jalovinskog nasipa prelijevanjem i mehanizma prekida pod kišnim uvjetimaIzvorni znanstveni članak Na temelju samo-konstruiranog uređaja za eksperimentiranje simulacijom prekida jalovinskog nasipa, eksperimentalna studija oštećenja nasipa provedena je u kišnim uvjetima. Zakonitost promjene linije infiltracije, proces razvoja tijela nasipa, mehanizam oštećenja nasipa i pomicanje nasipa nakon kolapsa dobiveni su pomoću uređaja za oborine, uređaja za mjerenje infiltracijske linije, uređaja za praćenje pomaka, kamere itd. Rezultati pokazuju sljedeće: u ranoj fazi kiše, promjena linije infiltracije u prednjem umjetnom jezeru i vanjskoj padini nasipa očito je zaostajala za razinom vode, a u sredini i kraju umjetnog jezera to nije uočeno. U kasnijoj fazi kiše, fenomen zaostajanja postupno nestaje, a promjena razine vode ima očiti učinak na promjenu linije infiltracije. U ranoj fazi oštećenja nasipa, curenje i preljev vode dogodili su se na vanjskoj padini nasipa, a došlo je do lokalnog kolapsa. U kasni...

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Gold tailings liquefaction under critical state soil mechanics

Cited by 71 publications

References 12 publications

Drained and Undrained Shear Behavior of Compacted Coal Wash

Drained and Undrained Shear Behavior of Compacted Coal Wash

Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage

Study on tailings dam over-topping failure model test and break mechanism under the rainfall condition

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