Rate-dependency and Stress-Relaxation of Unsaturated Clays

Meghdad Bagheri, Mohammad Rezania, Mohaddeseh Mousavi Nezhad

Research output: Contribution to journalArticle

Abstract

This paper presents the experimental program conducted for evaluation of the rate-dependent and stress-relaxation behaviour of unsaturated reconstituted London Clay. A series of constant rate of strain (CRS) oedometer tests were performed in an innovative suction- and temperature-controlled CRS oedometer cell where soil suction evolutions were monitored using two high-capacity tensiometers (HCTs). The coupled and independent effects of strain-rate and soil suction on one-dimensional stress–strain and stress-relaxation responses including the effects of pre-relaxation strain, stress, and strain-rate under both saturated and unsaturated conditions were evaluated. It was observed that the rate and magnitude of the relaxed stresses increase with increase in pre-relaxation strain, stress, and strain-rate, and decrease with increase in soil suction. The experimental results were further used for determination of time-dependent parameters, such as creep and compression indices, based on the stress-relaxation coefficient.
Original languageEnglish
Pages (from-to)(In-press)
JournalInternational Journal of Geomechanics
Volume(In-press)
Publication statusAccepted/In press - 12 Apr 2019

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clay
suction
strain rate
London Clay
oedometer test
tensiometer
soil
creep
rate
compression
temperature
effect

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Bagheri, M., Rezania, M., & Mousavi Nezhad, M. (Accepted/In press). Rate-dependency and Stress-Relaxation of Unsaturated Clays. International Journal of Geomechanics, (In-press), (In-press).

Rate-dependency and Stress-Relaxation of Unsaturated Clays. / Bagheri, Meghdad; Rezania, Mohammad; Mousavi Nezhad, Mohaddeseh.

In: International Journal of Geomechanics, Vol. (In-press), 12.04.2019, p. (In-press).

Research output: Contribution to journalArticle

Bagheri, M, Rezania, M & Mousavi Nezhad, M 2019, 'Rate-dependency and Stress-Relaxation of Unsaturated Clays' International Journal of Geomechanics, vol. (In-press), pp. (In-press).
Bagheri, Meghdad ; Rezania, Mohammad ; Mousavi Nezhad, Mohaddeseh. / Rate-dependency and Stress-Relaxation of Unsaturated Clays. In: International Journal of Geomechanics. 2019 ; Vol. (In-press). pp. (In-press).
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