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Yield stress of super soft clays

Lookup NU author(s): Emeritus Professor Colin Jones, Professor Barry Clarke


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Super soft clays can be defined as insensitive cohesive soils that have a water content higher than the liquid limit. It is difficult to define and measure the strength of these soils using conventional soil mechanics apparatus. It is proposed that the shear strength be determined using a rotary viscometer and be defined as the shear stress at zero strain (shear strain) rate in this test of viscosity. In this paper a number of potential methods to determine the shear strength or yield stress of super soft clays is considered. The yield stress of four super soft soils, each with varying water contents, have been measured using a rotary viscometer. The results of these tests together with published data are used to develop a relationship between the yield stress and the index properties of super soft clays.

Publication metadata

Author(s): Fakher A, Jones CJFP, Clarke BG

Publication type: Article

Publication status: Published

Journal: Journal of Geotechnical and Geoenvironmental Engineering

Year: 1999

Volume: 125

Issue: 6

Pages: 499-509

Print publication date: 01/06/1999

ISSN (print): 1090-0241

ISSN (electronic): 1943-5606

Publisher: American Society of Civil Engineers


DOI: 10.1061/(ASCE)1090-0241(1999)125:6(499)


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