Change of hydraulic conductivity during compression of undisturbed and remolded clays

Eight series of falling head hydraulic conductivity tests were performed on both undisturbed and remolded specimens of four clays from China using a modified oedometer to investigate the change of hydraulic conductivity during compression. Similar to their compression behavior, the undisturbed speci...

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Bibliographic Details
Published in:Applied clay science 2011-01, Vol.51 (1-2), p.86-93
Main Authors: Zeng, Ling-Ling, Hong, Zhen-Shun, Cai, Yuan-Qiang, Han, Jie
Format: Article
Language:English
Subjects:
Clay mineral
Clays
Compressibility
Compressing
Compression tests
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fluid dynamics
Fluid flow
Hydraulic conductivity
Hydraulics
Liquid limit
Mineralogy
Silicates
Strain
Void ratio
Voids
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Summary:Eight series of falling head hydraulic conductivity tests were performed on both undisturbed and remolded specimens of four clays from China using a modified oedometer to investigate the change of hydraulic conductivity during compression. Similar to their compression behavior, the undisturbed specimens showed the curves of hydraulic conductivity versus effective vertical stress lying above those of the remolded specimens. Past studies showed that the compression curves of remolded clays could be unified into a unique line using the void index. However, such unification between the void index and the hydraulic conductivity for remolded clays was not found in this study. The relationship between the void index (or void ratio) and the hydraulic conductivity for undisturbed specimen was almost identical to that of the remolded specimen. The relationship between the void ratio and the hydraulic conductivity on a logarithm scale was nearly linear with a slope of 0.5 times the initial void ratio at strains
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2010.11.005