Closure to “Plastic Limit, Liquid Limit and Undrained Shear Strength of Soil—Reappraisal” by Binu Sharma and Padma K. Bora

Sharma, Binu; Bora, Padma K.

doi:10.1061/(asce)1090-0241(2005)131:3(403)

J. Geotech. Geoenviron. Eng.

2005

DOI: 10.1061/(asce)1090-0241(2005)131:3(403)

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Closure to “Plastic Limit, Liquid Limit and Undrained Shear Strength of Soil—Reappraisal” by Binu Sharma and Padma K. Bora

Binu Sharma

Padma K. Bora

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Cited by 2 publications

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Undrained shear strength–water content relationship for sewage sludge

O’Kelly

2013

Proceedings of the Institution of Civil Engineers - Geotechnica

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Micro-fibrous organic clays include sludges and residues derived from municipal and industrial treatment processes. This paper studies the relationship of water content w against remoulded undrained shear strength s ur of one such material, namely sewage sludge (biosolids), and the factors affecting the coefficients a and b in the equation w ¼ as 2b ur : Data for s ur in fall-cone, vane shear and triaxial compression (TC) tests were examined, considering the material's mineralogical, physiochemical and biological properties. The effects of the different shearing modes, rates and confinement pressure on the mobilised strength were studied, since the different apparatuses approach the estimation of strength in different ways. The scalar relating the deduced s ur values in vane shear to TC was not singular, but was particularly sensitive to the confining pressure (ó 3 ) applied in TC tests, and also to the difference in strain rate between the different tests. The deduced s ur from the miniature vane was between 1 . 19 and 1 . 40 times that mobilised in quick-undrained TC of 38 mm diameter specimens under ó 3 of 100 kPa. New methods of analysis are presented to estimate the strength contribution of the gel-like pore fluid to the mobilised s ur , and also to determine more accurately the water content corresponding to the fall-cone liquid limit condition.

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Undrained shear strength–water content relationship for sewage sludge

O’Kelly

2013

Proceedings of the Institution of Civil Engineers - Geotechnica

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Characterisation and undrained strength of amorphous clay

O’Kelly

2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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This paper presents the physiochemical properties and relationship of saturated remoulded undrained shear strength, s ur , against water content, w, for an amorphous organic clay, namely an alum water-treatment residue material derived from the production of potable water. The log w-log s ur relationship was found to be strongly linear, and extended well beyond the measured plastic range. The effects of microstructure, and the shearing modes, rates and specimen confinement, are reported, along with the correspondence between s ur measured in triaxial compression and that deduced from fall-cone and miniature vane tests. The mobilised strength exhibited high strain-rate dependence, increasing by ,30%/log _ å cycle increase. The bulk water-treatment residue material could be easily remoulded at water contents below the measured Casagrande plastic limit, indicating that the reported plastic range was notional and, furthermore, that the use of liquidity index as an indicator of the material's consistency is unreliable. The paper concludes by presenting a conceptual model that goes towards explaining the relatively high values of s ur mobilised for this material at extremely high water contents.

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Closure to “Plastic Limit, Liquid Limit and Undrained Shear Strength of Soil—Reappraisal” by Binu Sharma and Padma K. Bora

Cited by 2 publications

References 6 publications

Undrained shear strength–water content relationship for sewage sludge

Undrained shear strength–water content relationship for sewage sludge

Characterisation and undrained strength of amorphous clay

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