Creep and consolidation of a stiff clay under saturated and unsaturated conditions

Mohammad Rezania, Meghdad Bagheri, Mohaddeseh Mousavi Nezhad

Research output: Contribution to journalArticle

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Abstract

In this paper the one-dimensional (1D) time-dependent behaviour of natural and reconstituted London Clay samples under saturated and unsaturated conditions is studied. For this purpose, a set of 1D consolidation tests including multi-staged loading (MSL) oedometer tests and single-staged loading (SSL) long-term oedometer creep tests were carried out on saturated and unsaturated specimens. Conventional oedometer cells were used for tests on saturated specimens, whereas a newly designed unsaturated oedometer cell, equipped with two high-capacity tensiometers (HCTs) for suction measurements, was used for unsaturated tests. The tests results revealed stress- and suction-dependency of primary and secondary consolidation responses of the soil samples. Furthermore, counter to formerly acknowledged suggestions of independency of the slope of normal consolidation line to suction changes, it was observed that an increase in suction results in a decrease of the slope of compression curve (Cc) and the creep index (Cαe) values, and an increase in yield vertical net stress (σp). Moreover, the Cαe/Cc ratio for London Clay was found to be stress- and suction-dependent, unlike the previously suggested hypotheses.
Original languageEnglish
Pages (from-to)(In-press)
JournalCanadian Geotechnical Journal
Volume(In-press)
Early online date27 Jun 2019
DOIs
Publication statusE-pub ahead of print - 27 Jun 2019

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suction
creep
consolidation
clay
London Clay
compression
oedometer test
time dependent behavior
tensiometer
test
soil

Bibliographical note

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively
from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • Stiff clay
  • Creep
  • Oedometer
  • Suction
  • Unsaturated soils

Cite this

Creep and consolidation of a stiff clay under saturated and unsaturated conditions. / Rezania, Mohammad; Bagheri, Meghdad; Mousavi Nezhad, Mohaddeseh.

In: Canadian Geotechnical Journal, Vol. (In-press), 27.06.2019, p. (In-press).

Research output: Contribution to journalArticle

Rezania, Mohammad ; Bagheri, Meghdad ; Mousavi Nezhad, Mohaddeseh. / Creep and consolidation of a stiff clay under saturated and unsaturated conditions. In: Canadian Geotechnical Journal. 2019 ; Vol. (In-press). pp. (In-press).
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N2 - In this paper the one-dimensional (1D) time-dependent behaviour of natural and reconstituted London Clay samples under saturated and unsaturated conditions is studied. For this purpose, a set of 1D consolidation tests including multi-staged loading (MSL) oedometer tests and single-staged loading (SSL) long-term oedometer creep tests were carried out on saturated and unsaturated specimens. Conventional oedometer cells were used for tests on saturated specimens, whereas a newly designed unsaturated oedometer cell, equipped with two high-capacity tensiometers (HCTs) for suction measurements, was used for unsaturated tests. The tests results revealed stress- and suction-dependency of primary and secondary consolidation responses of the soil samples. Furthermore, counter to formerly acknowledged suggestions of independency of the slope of normal consolidation line to suction changes, it was observed that an increase in suction results in a decrease of the slope of compression curve (Cc) and the creep index (Cαe) values, and an increase in yield vertical net stress (σp). Moreover, the Cαe/Cc ratio for London Clay was found to be stress- and suction-dependent, unlike the previously suggested hypotheses.

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