Undrained Fragility of Clean Sands, Silty Sands, and Sandy Silts

Thevanayagam, S.; Shenthan, T.; Mohan, Soumya; Liang, J.

doi:10.1061/(asce)1090-0241(2002)128:10(849)

Cited by 533 publications

(232 citation statements)

References 15 publications

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“…9(a). This is similar to the fully dispersed or partially dispersed state proposed by Thevanayagam et al (2002) for sand-silt mixtures. It can be expected that the behaviour of the pond samples will be dominated by the matrix of platy particles with the bulky particles providing secondary support.…”

Section: Particle Interaction In Gold Tailingssupporting

confidence: 88%

The effect of fabric on the behaviour of gold tailings

Chang¹,

Heymann²,

Clayton³

2011

Géotechnique

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Undisturbed sampling of gold tailings, especially under the water table, is difficult and in many cases impossible. For this reason laboratory testing of tailings is generally conducted on reconstituted material. It has been shown that laboratory sample preparation methods can affect the mechanical behaviour of cohesionless soil and it is generally believed that the difference in mechanical behaviour is attributable to a difference in the fabric (particle arrangement) inherent in the preparation method. An experimental programme was conducted to (a) examine the fabric which ensues upon sample preparation and (b) to investigate the effect of any fabric differences on the mechanical behaviour of gold tailings. Comparison was made between the behaviour and fabric of undisturbed and reconstituted moist tamped and slurry deposited samples. The results from the experimental programme show that there is indeed a difference in fabric between undisturbed and reconstituted gold tailings samples. Slurry preparation generally replicates the fabric and behaviour of the undisturbed sample better than moist tamping, but neither fully replicates the undisturbed sample. At large strains, the samples reach a unique critical state friction angle, but at different stress states.

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Section: Particle Interaction In Gold Tailingssupporting

confidence: 88%

The effect of fabric on the behaviour of gold tailings

Chang¹,

Heymann²,

Clayton³

2011

Géotechnique

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“…This behavior is typical of sands containing less than around 30 % fines and is characteristic of gap-graded mixtures and mixtures whose finer fraction is significantly smaller than the coarser fraction. Similar behavior has been observed in other studies published in the literature (Cubrinovski and Ishihara 2002;Lade et al 1998;Salgado et al 2000;Thevanayagam et al 2002) and is due to the fact that the finer particles occupy the void space between sand particles, reducing the global void ratio of the mixture. Any fine particles originally located between the surface of adjacent sand grains are later displaced into the voids between the sand particles during densification, as e min techniques require a significant amount of energy (vibration or tapping) to densify the samples.…”

Section: Limiting Void Ratiossupporting

confidence: 89%

“…Furthermore, this technique enables specimen reconstitution at void ratios that may be too high and thus not possible for natural soil deposits formed underwater (Kuerbis 1989;Vaid 1994). Loose, saturated MT specimens of sands containing fines are typically the most contractive (Thevanayagam et al 2002;Vaid et al 1999).…”

Section: Specimen Preparationmentioning

confidence: 99%

A New Slurry-Based Method of Preparation of Specimens of Sand Containing Fines

Carraro¹,

Prezzi

2008

Geotechnical Testing Journal

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ABSTRACT:A new method of specimen reconstitution is presented that is appropriate for element testing of sands containing either plastic or nonplastic fines. The method allows reconstitution of homogeneous, saturated specimens of sands containing fines whose stress-strain response closely resembles the stress-strain response of natural soil deposits formed underwater (e.g., alluvial and offshore submarine deposits, hydraulic fills, and tailings dams). A procedure is described to evaluate the maximum void ratio (e max ) of sands containing fines under conditions that more appropriately represent soil deposition at its loosest state in aquatic environments. For soils deposited in water, the data obtained with the procedure proposed in this paper suggest that ASTM D 4254 overestimates the e max of sands containing plastic fines and underestimates the e max of sands containing nonplastic fines.

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“…To account for such a mechanism, Thevanayagam et al (2002) proposed the concept of equivalent granular void ratio, e*, for f c , f thre…”

mentioning

confidence: 99%

“…where b is the fraction of fines that take part in the skeleton force structure and f thre is the threshold fines content as defined in Thevanayagam et al (2002). It is evident that e s = e*.…”

mentioning

confidence: 99%