The Theory of One-Dimensional Consolidation of Saturated Clays

Gibson, R. E.; England, Gavin L.; Hussey, M. J. L.

doi:10.1680/geot.1967.17.3.261

Cited by 637 publications

(157 citation statements)

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“…Several modelling techniques (of varying complexities) have been proposed to simulate these bed consolidation processes. The most comprehensive and widely used approach, at least for primary consolidation (Grasso et al 2015), is known as the Gibson model (Gibson et al 1967), which computes the time evolution of vertical concentration profiles over the unified hindered settling and initial consolidation phases of bed evolution (Toorman 1996). The Gibson theory was developed for, and has been applied successfully to simulate, consolidation processes in monodisperse cohesive sediments (i.e.…”

Section: Previous Work On Sand-mud Sedimentationmentioning

confidence: 99%

Monitoring and characterisation of sand-mud sedimentation processes

et al. 2016

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Estuaries and tidal inlets are often characterised by the presence of both cohesive and non-cohesive sediments. Knowledge of the sedimentation behaviour of sand-mud mixtures is therefore crucial to the understanding and prediction of the time-dependent structure (i.e. mixed or segregated), composition and erodibility of sediment bed deposits developing within these environments. In the current study, a series of settling column tests are conducted to investigate the hindered settling and initial bed consolidation phases of a range of sandclay mixtures to determine the parametric conditions under which bed segregation occurs. A new, non-invasive, electrical resistivity measurement technique is employed to capture both temporal and spatial changes in the density, porosity and composition of the evolving sand-clay bed deposits, complimented by time-lapsed images of the sedimentation process within the column. The results show that the formation of segregated (sand-clay) bed layers with bed deposits is largely controlled by the initial fractional composition (i.e. relative sand and clay concentrations). Specifically, mixtures with low clay contents are shown to form well-defined (sandclay) layer segregation within the resulting deposits, while higher clay contents result in more transitional segregation patterns or no layer segregation (for very high clay concentrations). The physical mechanisms under which these different segregation types can be generated are illustrated through predictions from an existing polydisperse hindered settling model. This model indicates that the degree of bed segregation, and time scale over which this occurs, correlates well with the difference in predicted hindered settling characteristics and upward displacements associated with the sand and clay fractions, respectively. In this regard, the new experimental dataset provides validation for the polydisperse model (for the first time), with the combined data and model predictions providing new insight into mixed (sand-clay) sedimentation processes.

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Section: Previous Work On Sand-mud Sedimentationmentioning

confidence: 99%

Monitoring and characterisation of sand-mud sedimentation processes

et al. 2016

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“…Regarding Equation 3, Gibson et al 18 proposed the following equation for C F Geotechnical Engineering 162 Issue GE6 Discussion…”

Section: Authors' Replymentioning

confidence: 99%

“…However, Gibson et al 18 have stated that in most applications it is preferable to work in terms of the equation…”

Section: Authors' Replymentioning

confidence: 99%

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Discussion: Constant rate of displacement test on ultra-soft soil

Bo¹,

Wong²,

Choa³

2009

Proceedings of the Institution of Civil Engineers - Geotechnica

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The authors have elucidated the underlying importance of using an appropriate strain rate (R) in order to obtain the true e-log ó9 v response and the non-linear steady-state C v and k values (Equations 8 and 9) from the constant rate of displacement (CRD) consolidation test, and their proposed method, based on estimated compression index values, for selecting a suitable strain rate for large-strain CRD testing of slurry sediments is welcomed. In carrying out a series of CRD tests for R between 0 . 01%/min and 0 . 1%/min on highplasticity clay (CH) slurry specimens, the authors rightly point out that the high measured pseudo-preconsolidation pressures, which clearly do not exist in reconstituted ultra-soft soil, are due to viscous effects during the test procedure.

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“…Such variations would inevitably affect the development of porewater pressure and surface settlement. Many attempts have been made to derive analytical solutions for traditional 1D consolidation problems considering the nonlinear variations of soil permeability and compressibility (Davis and Raymond 1965;Gibson et al 1967;Gibson et al 1990;Xie et al 2002;Lekha et al 2003;Indraratna et al 2005;Geng et al 2006;Walker and Indraratna 2006;Cai et al 2007;Hu et al 2009;Walker et al 2012;Abuel-Naga and Pender 2012;Zhu and Yin 2012;Hsu and Tsai 2015). However, the analytical solution for electroosmotic consolidation with variable soil parameters has seldom been studied.…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for Electroosmotic Consolidation Considering Nonlinear Variation of Soil Parameters

et al. 2017

Int. J. Geomech.

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Electroosmotic consolidation can be used as an efficient technique for soft soil improvement. Considering the limitation in previous theories that soil parameters keep constant during electroosmotic consolidation, the nonlinear relationships between soil compressibility, hydraulic and electroosmosis conductivities, and void ratio are incorporated in a one-dimensional model in the present study. The analytical solutions for the ultimate excess pore-water pressure and surface settlement are derived. A comparison between the proposed analytical solutions and traditional theory indicates that the nonlinear variation of hydraulic conductivity results in a larger ultimate excess pore-water pressure, whereas the nonlinear variation of electroosmosis conductivity leads to a smaller one. The effects are more significant for soils with higher compressibility. The nonlinear variation of soil compressibility exhibits remarkable impact on the development of excess pore-water pressure when the nonlinear variations of hydraulic and electroosmosis conductivities are considered. Compared with the ultimate excess pore-water pressure, the impact of nonlinear variations of soil parameters on the ultimate surface settlement is less significant.

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The Theory of One-Dimensional Consolidation of Saturated Clays

Cited by 637 publications

References 5 publications

Monitoring and characterisation of sand-mud sedimentation processes

Monitoring and characterisation of sand-mud sedimentation processes

Discussion: Constant rate of displacement test on ultra-soft soil

Analytical Solution for Electroosmotic Consolidation Considering Nonlinear Variation of Soil Parameters

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