A new approach for determining compressibility and permeability characteristics of dredged slurries with high water content

Shi, Li; Yin, Xing; Sun, Honglei; Pan, Xiaodong; Yuan, Zonghao; Cai, Yuanqiang

doi:10.1139/cgj-2020-0676

Cited by 9 publications

(3 citation statements)

References 51 publications

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“…The dynamics of the cake layer thickness are shown below. Some results of numerical calculations using (33) and (34) are shown in Figures 4-6. From the curves in the figures, with the beginning of the unloading process at the boundary of the sediment and the filter, the pressure vanishes due to the hydraulic resistance of the filter.…”

Section: Results Of Numerical Analysismentioning

confidence: 99%

“…deformable medium can be identified [32,33]. When loading the system by creating a pressure difference or creating a filtration rate, the cake is deformed and it consolidates, causing changes in the porosity, permeability, concentration of solid particles, etc.…”

Section: Derivation Of Equationsmentioning

confidence: 99%

“…Until now, the cake has mainly been considered as a medium, the deformation of which occurs in a purely elastic regime. Many studies where the cake layer is considered as an elastically deformable medium can be identified [32,33]. When loading the system by creating a pressure difference or creating a filtration rate, the cake is deformed and it consolidates, causing changes in the porosity, permeability, concentration of solid particles, etc.…”

Section: Introductionmentioning

confidence: 99%

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An Axisymmetric Problem of Suspension Filtering with Formation of Elastic–Plastic Cake Layer

et al. 2022

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The paper considers an axisymmetric problem of filtering suspensions with the formation of a cake on the filter surface. It is supposed that the cake has elastic–plastic properties. Using the mass conservation equation and Darcy’s law, the suspension filtration equations at the elastic–plastic regime are derived, which characterize the partial irreversibility of the filtration characteristics when the system is unloaded after loading. An equation is also derived that describes the increase in the thickness of the cake. Problems of suspension filtering for the derived equations are posed and numerically solved. The role of partial irreversibility of deformation on the filtration characteristics is estimated. Distributions of compression pressure, the concentration of solid particles in the cake, relative permeability in the mode of primary and secondary loading of the system, as well as in the mode of unloading after the first loading are obtained. The growth dynamics of the cake thickness are also established. The parameters of plasticity in terms of particle concentration and permeability mainly affect the corresponding indicators, i.e., on the particle concentration distribution and on the relative permeability of the cake. It is shown, that depending on the change in the model parameters characterizing the elastic–plastic properties of the cake, the filtration characteristics change significantly. This indicates a significant effect of the elastic–plastic deformation of the cake on the suspension filtration characteristics.

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Section: Results Of Numerical Analysismentioning

confidence: 99%

Section: Derivation Of Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Axisymmetric Problem of Suspension Filtering with Formation of Elastic–Plastic Cake Layer

et al. 2022

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A two‐stage combined filtration‐consolidation model for slurry ground treated by vacuum preloading

Ye,

Shi,

Cai

2024

Num Anal Meth Geomechanics

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The vacuum preloading technique is extensively employed for ground improvement, particularly for slurry ground characterized by high‐water content and low strength. Such ground frequently exhibits a delay in pore water pressure dissipation when treated with prefabricated vertical drains. To clarify the drainage and consolidation behaviour of high‐water content slurry ground under vacuum preloading, this study proposed a two‐stage combined model that integrates both filtration and consolidation processes. Initially, an axisymmetric filtration model was used to describe the formation of the soil column through the radial migration and compaction of the particles. The end‐of‐filtration radial distributions of void ratio, permeability coefficient, and effective pressure served as initial conditions for the consolidation stage analysis. This stage was depicted using a large strain consolidation model based on the free strain condition. The results showed the necessity of incorporating the filtration stage to capture the overall drainage mechanism and characteristics of slurry ground with vacuum preloading treatment.

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Study of design parameters for staged-filled slurry treated by prefabricated horizontal drains under vacuum preloading

Song,

Pan,

Chen

et al. 2024

Geotextiles and Geomembranes

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A new approach for determining compressibility and permeability characteristics of dredged slurries with high water content

Cited by 9 publications

References 51 publications

An Axisymmetric Problem of Suspension Filtering with Formation of Elastic–Plastic Cake Layer

An Axisymmetric Problem of Suspension Filtering with Formation of Elastic–Plastic Cake Layer

A two‐stage combined filtration‐consolidation model for slurry ground treated by vacuum preloading

Study of design parameters for staged-filled slurry treated by prefabricated horizontal drains under vacuum preloading

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