Critical state interpretation of effects of fines in silty sands

Kwa, Katherine; Airey, David

doi:10.1680/jgele.15.00176

Cited by 17 publications

(8 citation statements)

References 17 publications

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“…It has been previously suggested that the transitional behaviour is due to different reasons such as fines content [19] or fabric structure [12]. However, the findings of this study show that although these factors affect the location of the CSL, the initial void ratio strongly influences transitional behaviour.…”

Section: Resultscontrasting

confidence: 67%

“…Recent studies [10,8,[11][12][13] on intermediate soils reported that soils with a mixture of particles ranging between sand and clay that were remoulded in laboratory conditions did not approach a unique critical state line (CSL). Shipton and Coop [10] showed that each type of soil produced a wide range of CSLs, and the authors proposed that these lines are influenced by the presence of fine particles within the soil mass.…”

Section: Introductionmentioning

confidence: 99%

“…Shipton and Coop [10] showed that each type of soil produced a wide range of CSLs, and the authors proposed that these lines are influenced by the presence of fine particles within the soil mass. Kwa and Airey [12] experimentally investigated different mixes of sand and fines, and found that in all cases, two unique lines were approached in which the denser samples tended to approach a parallel line located below that of the samples with higher void ratios. The relation between the initial void ratio and the CSL was investigated by Ferreira and Bica [8].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Initial Void Ratio on Critical State Behaviour of Poorly Graded Fine Sands

2020

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The application of critical state framework depends on the presence of either a unique critical state line (CSL). However, many authors have observed that a transitional behaviour occurs in certain granular intermediate soils in which the fines content as well as the initial void ratio have a significant effect on the location of this line. This work investigates these effects in poorly graded granular soils as previous studies reported that this type of soil does not exhibit transitional behaviour. Results from this study reveal that poorly graded fine-grained sand exhibits transitional behaviour similar to that of intermediate soils and subsequently, it can be grouped into ranges of initial densities in which each group approaches a unique CSL in v:lnp' space. A unique state boundary surface is identified by determining the critical state parameters from each group and using these parameters to normalize the stress paths; this shows that the critical state framework can be successfully applied to this type of soil.

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Section: Resultscontrasting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Initial Void Ratio on Critical State Behaviour of Poorly Graded Fine Sands

2020

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“…Kwa and Airey [15] determined the effect of the addition of non-plastic feldspar particles (<0.075 mm) on the properties of quartzite sand. The authors performed tests on samples of well-grained, fully saturated soils, compacted with the standard Proctor method (at optimum water content) and minimally compacted, to determine the effect of fine particles on the location of the critical state line (CSL) on the e-log p .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Compacted Fly Ash as a Transitional Soil

Zabielska-Adamska

2020

Materials

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Cohesive and non-cohesive soils show a number of properties typical of a given category. Cohesive soils are characterized by cohesion, and the properties of compacted soils closely depend on moisture at compaction. However, many researchers have found the existence of so-called mixed or transitional soils. Compacted transitional soils, macroscopically recognized as non-cohesive, are characterized by mechanical properties and hydraulic conductivity which are strictly dependent on the moisture content at compaction. The aim of this work is to show the influence of the content of fine particles in fly ash on the variation of California Bearing Ratio (CBR) values as a parameter strictly dependent on initial compaction. The CBR values were interpreted in terms of moisture at compaction, void ratio and intergranular void ratio. Three different research samples were selected with fine contents of 45%, 55% and 70%; all samples corresponded in terms of grading with sandy silt. Fly ash containing only non-plastic fines behaved as cohesive soils despite the lack of plasticity. The CBR values decreased with increasing moisture at compaction or void ratio. The CBR values, plotted as a function of the intergranular void ratio, have lower penetration resistance together with fine content.

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“…Bedin et al [14] and Carrera et al [23] successfully investigated the behaviour of gold or Stava tailings within the critical state framework. Under this framework, the effects of finer particles, i.e., silts on sands behaviour, have been analyzed [24][25][26][27]. It can be seen that the fly ash is normally employed as additive and to be mixed with soils with poor geotechnical characteristics for the purpose of improving their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Interpretation of Effects of Aeolian FineSands on Coal Fly Ash in Northern Shaanxi Province, China

Wei

Gao

et al. 2020

Advances in Civil Engineering

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The coal fly ash (CFA) is massively produced as a consequence of coal source residues in Northern Shaanxi Province, China. Since disposing the waste materials in mountainous gully widely distributed in the same area is one of the possibilities, the high compressibility and low strength of CFA become a severe problem for the stacking. The aeolian fine sands are close to Mu Us Desert, as the addition material was introduced to improve the mechanical behaviours of CFA. A series of oedometer and triaxial tests were performed on pure CFA, pure sands, and their mixtures containing 25%, 50%, and 80% of sands by weight, respectively. Test results were analyzed within the framework of critical state soil mechanics. With increasing sands content, normally consolidated lines (NCLs) and critical state lines (CSLs) of tested materials change in volume space as well as their compression or shearing paths. The mechanical parameters like C c , Г, λ decrease as a result of increasing sands content. On the contrary, the M and ∅ c s ' increase with augmenting sands content. It is concluded that the aeolian sands can significantly decrease the compressibility of the CFA and increase its shear strength. These findings would be useful for the treatment of CFA, which is significant for solving environmental problems in northern Shaanxi Province.

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Critical state interpretation of effects of fines in silty sands

Cited by 17 publications

References 17 publications

Influence of Initial Void Ratio on Critical State Behaviour of Poorly Graded Fine Sands

Influence of Initial Void Ratio on Critical State Behaviour of Poorly Graded Fine Sands

Characteristics of Compacted Fly Ash as a Transitional Soil

Mechanical Interpretation of Effects of Aeolian FineSands on Coal Fly Ash in Northern Shaanxi Province, China

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