Some aspects of the compressibility behaviour of a clayey sand

Martins, Flavia Burmeister; Bressani, Luiz Antônio; Coop, M. R.; Bica, Adriano Virgílio Damiani

doi:10.1139/cgj-38-6-1177

Cited by 16 publications

(18 citation statements)

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“…Emphasis is given to the compression and shearing behaviour, static liquefaction, the possible occurrence of transitional behaviour (as defined by e.g. Martins et al, 2001;Altuhafi and Coop, 2011;Xu and Coop, 2016), sample preparation effects as well as their small-strain stiffness/stiffness anisotropy.…”

Section: Introductionmentioning

confidence: 99%

The mechanics of a silt-sized gold tailing

Coop

Senetakis

et al. 2018

Engineering Geology

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Tailing dam failures result in irreversible environmental impacts and cause fatalities. In recent years the mechanical behaviour of tailing geo-materials has received more attention by the geomechanics and engineering geology communities in an attempt to understand better their behaviour in the light of designing safer tailing dams. In this study, the mechanical behaviour of a gold tailing from Brazil is thoroughly investigated by conducting a series of compression and shearing tests as well as dynamic element tests. Fabric effects from the sample preparation method, the susceptibility to liquefaction and the possibility of any transitional behaviour are presented and discussed within a soil mechanics framework. Comparisons are made between the present gold tailing and previously published data on other tailings, giving a general view of the mechanics of tailings and the effects of grading. The results show that for this tailing the rate of convergence for different initial densities to the normal compression line is slow, and so the depositional density would affect the volume to far higher stresses than the material would be expected to experience in-situ. For this tailing any fabric effects from the sample preparation method were found to be very small to negligible with respect to smallstrain behaviour and critical state behaviour. For different tailings, even if the particle sizes may cover a wide range, the susceptibility to static liquefaction, as determined by the location of the horizontal asymptote of the critical state line in the specific volume-log stress plane, shows no consistent variation. So it can be concluded that neither the pond nor the upper beach tailings are more susceptible.

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Section: Introductionmentioning

confidence: 99%

The mechanics of a silt-sized gold tailing

Coop

Senetakis

et al. 2018

Engineering Geology

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“…For some soils a rapid change of soil stiffness can be observed, and this is taken as the commencement of virgin yielding (e.g., Burland 1990;Leroueil and Vaughan 1990;Hight et al 1992;Liu and Carter 2000a). However, for other types of soil, such as many sands, there may be no clear difference in soil stiffness (e.g., Liu et al 2000;Martins et al 2001).…”

Section: Loading Within the Yield Surfacementioning

confidence: 99%

Sydney Soil Model. I: Theoretical Formulation

2011

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In this paper a theoretical study of the behavior of structured soils, including both clays and sands, is presented. A new model, which is referred to as the "Sydney soil model," is formulated within the framework of critical state soil mechanics. In the proposed model, the mechanical behavior of soil is divided into two parts, that at a reference state and that attributed to the influence of soil structure. The reference state behavior is formulated according to the soil properties at the critical state of deformation, based on the concept of plastic volumetric hardening. The effects of structure are captured in the model by incorporation of the additional voids ratio that arises owing to the presence of soil structure. The formulation is generalized to include both isotropic compression and general shearing. In part I of this paper, a new theoretical framework for modeling structured soil behavior and the formulation of the proposed Sydney soil model are introduced. In part II of this paper, the Sydney soil model is employed to simulate the behavior of clays and sands, including calcareous clays and sands subjected to both drained and undrained shearing, and the performance of the model is evaluated.

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“…Such soils have been described as transitional in the literature. Martins et al 2001 concluded that transitional soil behavior is a characteristic of gap-graded soils. However, this type of behavior can also be observed in well-graded materials and silty soils (e.g.…”

Section: Introductionmentioning

confidence: 99%

Compression and Strength Characteristics of Two Silts of Low and High Plasticity

Georgiannou

Coop

Altuhafi

et al. 2018

J. Geotech. Geoenviron. Eng.

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The potential for enhanced strength or stiffness arising from the microstructure of natural silty soils compared to their reconstituted state is examined using the framework proposed by Burland for clays, to assess to what extent it can be used for silts. A detailed study performed on two clayey silts of low and high plasticity respectively, in their intact and reconstituted state, is used to illustrate the different response of the silts compared to clays in terms of compressibility and strength e.g. multiplicity and shape of the normal compression lines and strong dilative tendencies during undrained and drained shearing. This paper shows that the response of the reconstituted silts can be used as a reference to identify the influence of the microstructure on the compressibility and strength of the intact silts. The results are found to give clear signs of structure in both compression and shearing only for the low plasticity silt. Stiffness measurements corroborate these findings.

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Some aspects of the compressibility behaviour of a clayey sand

Cited by 16 publications

References 0 publications

The mechanics of a silt-sized gold tailing

The mechanics of a silt-sized gold tailing

Sydney Soil Model. I: Theoretical Formulation

Compression and Strength Characteristics of Two Silts of Low and High Plasticity

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