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

Article


Rezania, M., Bagheri, M. and Mousavi-Nezhad, M. 2020. Creep and consolidation of a stiff clay under saturated and unsaturated conditions. Canadian Geotechnical Journal. 57 (5), pp. 728-741. https://doi.org/10.1139/cgj-2018-0398
AuthorsRezania, M., Bagheri, M. and Mousavi-Nezhad, M.
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 dependency 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 (C꜀) and the creep index (Cₐₑ) values and an increase in yield vertical net stress (σₚ). Moreover, the Cₐₑ/C꜀ ratio for London Clay was found to be stress- and suction-dependent, unlike the previously suggested hypotheses.

Keywordsstiff clay; creep; oedometer; suction; unsaturated soils
JournalCanadian Geotechnical Journal
Journal citation57 (5), pp. 728-741
ISSN0008-3674
1208-6010
Year2020
Publisher Canadian Science Publishing
Digital Object Identifier (DOI)https://doi.org/10.1139/cgj-2018-0398
Publication dates
Online27 Jun 2019
PrintMay 2020
Publication process dates
Deposited01 Mar 2024
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