Effect of Stress Release on Shear Modulus of Clays

An experimental study using resonant column tests determined the effect of a temporary release of confining pressure (under conditions of no drainage) on the low-amplitude shear modulus, Go, of two cohesive soils. The soils tested were a remolded kaolinite clay and a natural "undisturbed"...

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Bibliographic Details
Published in:Journal of geotechnical engineering 1983-10, Vol.109 (10), p.1233-1245
Main Authors: Athanasopoulos, G. A, Richart, F. E
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Exact sciences and technology
Geotechnics
Soil investigations. Testing
TECHNICAL PAPERS
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Summary:An experimental study using resonant column tests determined the effect of a temporary release of confining pressure (under conditions of no drainage) on the low-amplitude shear modulus, Go, of two cohesive soils. The soils tested were a remolded kaolinite clay and a natural "undisturbed" silty clay. It was found that a temporary release of confining pressure induces disturbances which are manifested by a drop in the value of Go. After reapplication of the original confining pressure the cohesive soil regains the lost amount of Go, with the logarithm of "regain-time" increasing linearly with the logarithm of the duration of the confinement prior to its release (i.e. the "age" of the cohesive soil). It is suggested that the findings be used for estimation of the secondary time that must be taken into account in a resonant column test on "undisturbed" samples, to establish Go representative of the in-situ value.
ISSN:0733-9410
1944-8368
DOI:10.1061/(ASCE)0733-9410(1983)109:10(1233)