One-dimensional self-weight consolidation of a lumpy clay fill

Yang, Lijing; Tan, Thiam‐Soon; Tan, Siew‐Ann; Leung, C.F.

doi:10.1680/geot.52.10.713.38851

Cited by 7 publications

(19 citation statements)

References 14 publications

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“…reconstituted soil in the inter-lump voids and the lumps diminishes. Still, the consolidation properties are still relevant to the original structure as also indicated by Yang et al (2002). Within the second stage, the shear strength of the clayfill is governed by the reconstituted soil existing in the inter-lump voids.…”

Section: Structure Transition Of Lumpy Materialsmentioning

confidence: 97%

Laboratory investigation of artificial lumpy materials

Shi

2014

Engineering Geology

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Section: Structure Transition Of Lumpy Materialsmentioning

confidence: 97%

Laboratory investigation of artificial lumpy materials

Shi

2014

Engineering Geology

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“…Wilson & Aifantis (1982) proposed a general coupled flow-deformation model for a fissured porous medium. As a lumpy clay system is similar to a fractured porous medium, Nogami et al (2001) and Yang et al (2002) have adapted the double porosity theory to describe the consolidation of a lumpy clay fill.…”

Section: Introductionmentioning

confidence: 99%

“…The theory of lumpy clay consolidation is summarised by the following partial differential equations (Yang et al, 2002): À 1 þ e ð Þ dó 9 de @ 2 u @x 2 ¼ â 1 @ p 1 @x þ â 2 @ p 2 @x þ ª…”

Section: Introductionmentioning

confidence: 99%

“…Exact solutions to the above equations have been found only for problems with an elastic skeleton, a simple geometry and simple boundary conditions (Wilson & Aifantis, 1982;Yang et al, 2002). For more realistic problems, numerical techniques are needed to integrate these equations.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the one-dimensional lumpy clay consolidation formulation developed by Yang et al (2002) is implemented using finite element analysis, taking into account non-linear void ratio against permeability and effective stress relations to ensure a more realistic prediction. This implementation was then used to analyse results from the two one-dimensional consolidation tests on a lumpy clay layer.…”

Section: Introductionmentioning

confidence: 99%

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One-dimensional consolidation of lumpy clay with non-linear properties

Yang

Tan

2005

Géotechnique

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When dredged clay lumps are used as reclamation fill, large voids exist between the lumps. Thus consolidation of the lumps themselves, and closing up of inter-lump voids, contribute to the overall settlement, making the fill a complicated non-linear medium. Yang et al. (2002, Géotechnique 52, No. 10, 713-725) have used the double porosity model to describe the consolidation of this type of fill using linear properties to arrive at analytical solutions. In reality, the behaviour is highly non-linear, and the finite element (FE) method is used to solve the non-linear equations. Results from the FE analysis of the consolidation of the lumpy clay fill were shown to be able to match the analytical solutions. Two one-dimensional consolidation tests were conducted for this study. In the first case, water was used to fill the inter-lump voids, whereas in the second case, slurry was used. The procedure for determining the permeability and the e-logó9 relationships for the inter-lump and intra-lump systems is explained in this paper. All the parameters could be estimated from various tests, except for the fluid transfer parameter, and this was back-analysed, using data from other works as a guide. The results presented show that the model can predict well the measured settlement and pore pressures in inter-lump and intra-lump systems in both experiments, essentially because this is a back-analysis. But the fact that the model can provide consistent prediction of numerous parameters indicates that the model is able to capture the essence of the mechanics of a lumpy clay system.Lorsque des morceaux d'argile draguée sont utilisés pour remblayer des terres récupérées, de grands vides se produisent entre les morceaux. Ainsi la consolidation des morceaux eux-mêmes, et le remplissage de ces vides, contribuent au tassement global, faisant du remblai un matériau non linéaire compliqué. Yang et al. (2002, Géo-technique 52, No. 10. 713-725) ont utilisé le modèle de porosité double pour décrire la consolidation de ce type de sol utilisant les propriétés linéaires pour arriver à des solutions analytiques. En réalité, le comportement est extrêmement non linéaire, et nous utilisons la méthode d'éléments finis (FE) pour résoudre les équations non linéaires. Les résultats des analyses FE sur la consolidation du remblai d'argile en morceaux ont montré qu'ils pouvaient correspondre aux solutions analytiques. Nous avons réalisé pour cette étude, deux essais de consolidation unidimensionnels. Dans le premier cas, de l'eau a été utilisée pour remplir les vides entre les morceaux alors que, dans le second cas, de la boue a été utilisée. Nous expliquons dans cet exposé la procédure visant à détermi-ner la perméabilité et les relations e-logó pour les systèmes inter et intra morceaux. Tous les paramètres ont pu être estimés à partir de divers essais, sauf en ce qui concerne le paramètre de transfert liquide qui a fait l'objet d'une rétro-analyse, utilisant comme guide des données provenant d'autres travaux. Les résultats pré-sentés montrent que ...

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Sedimentation–consolidation of a double porosity material

Wong

Leo

Pereira

et al. 2007

Computers and Geotechnics

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This paper studies the sedimentation-consolidation of a double porosity material, such as lumpy clay. Large displacements and finite strains are accounted for in a multidimensional setting. Fundamental equations are derived using a phenomenological approach and non-equilibrium thermodynamics, as set out by Coussy [5]. These equations particularise to three non-linear partial differential equations in one dimensional context. Numerical implementation in a finite element code is currently being undertaken.

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One-dimensional self-weight consolidation of a lumpy clay fill

Cited by 7 publications

References 14 publications

Laboratory investigation of artificial lumpy materials

Laboratory investigation of artificial lumpy materials

One-dimensional consolidation of lumpy clay with non-linear properties

Sedimentation–consolidation of a double porosity material

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