Influence of grading on the mechanical behaviour of Stava tailings

Carrera, Alicia; Coop, M. R.; Lancellotta, Renato

doi:10.1680/geot.9.p.009

Cited by 204 publications

(123 citation statements)

References 27 publications

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“…The value of stress ratio at the critical state, (q/p') cs , has been predicted from the stress-dilatancy graph (Fig. A1(b)) for the test, extending the last part of the curve to the point of intersection with the zero dilatancy axis (Carrera et al 2011). The rate of volumetric strain, δε v /δε s , plotted against the stress ratio was used to assess dilatancy, where ε v is volumetric strain and ε s is deviatoric strain.…”

Section: Appendix A: Example Of Estimation Of Critical Statementioning

confidence: 93%

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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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Section: Appendix A: Example Of Estimation Of Critical Statementioning

confidence: 93%

“…The pre-shear void ratios (e i ) for the ballast specimens have been determined from weight-volume relationships and been summarised in Table 2. The critical state was determined by extrapolation of stress-strain data to a most probable value following an approach recommended by Carrera et al (2011). The BBI values calculated by eq.…”

Section: Model Validationmentioning

confidence: 99%

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

2015

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“…plane. As theˆnes content increases and the soil becomes better graded, many have found that the critical state line moves downwards (e.g., Fourie and Papageorgiou, 2001) and some have seen that as theˆnes content is increased further, it then starts to move back upwards (e.g., Thevanayagam et al, 2002;Murthy et al, 2007;Carrera et al, 2011). In these examples, the predominant movement in the critical state line was a vertical translation, whereas in other cases, signiˆcant changes of gradient have been seen with less pronounced translation (e.g., Coop and Atkinson, 1993;Andrianopoulos et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Particle Breakage on the Location of the Critical State Line of Sands

Bandini

Coop

2011

Soils and Foundations

227

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Recent constitutive models for sands that incorporate the eŠects of particle breakage have emphasised the change of location of the critical state line in the void ratio: logarithm of the mean eŠective stress plane as the grading changes. This approach diŠers from earlier experimental work in which a unique and static critical state line was assumed: the basic diŠerence between the two approaches being the question of whether the soil``knows'' about the breakage that it has undergone. A series of triaxial tests was therefore conducted to investigate the eŠect of particle breakage on the current location of the critical state line. Two diŠerent shearing stages were used: theˆrst to produce particle breakage and the second one to see if the material``remembers'' the original state if sheared again. It was found that the critical state line does move with particle breakage, so indicating that the soil does``know'' about the breakage that has occurred. However, large amounts of breakage were required to create a signiˆcant shift. The results show, furthermore, that the eŠect of the change of grading is not only a verticle movement in the the critical state line but also a rotation. Comparisons with the behaviour of reconstituted samples with the same grading as the pre-sheared samples demonstrated that while the soil does have some``knowledge'' that it has undergone breakage, the initial grading remains more important than the current grading in determining its behaviour. An analysis of thin sections showed that this is probably because when particles break, the broken fragments remain in close proximity to each other and are not distributed uniformly throughout the soils.

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“…For the specimens prepared at RC level of 90% and tested at high effective confining pressures that did not reached critical state at axial strains of 35%, an extrapolation method proposed by Carrera et al (2011) was adopted to estimate the location of critical state.…”

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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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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Influence of grading on the mechanical behaviour of Stava tailings

Cited by 204 publications

References 27 publications

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

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

The Influence of Particle Breakage on the Location of the Critical State Line of Sands

Drained and Undrained Shear Behavior of Compacted Coal Wash

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