Rezania, Mohammad, Bagheri, Meghdad and Mousavi Nezhad, Mohaddeseh (2020) Creep and consolidation of a stiff clay under saturated and unsaturated conditions. Canadian Geotechnical Journal, 57 (5). pp. 728-741. doi:10.1139/cgj-2018-0398 ISSN 1208-6010.

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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.

Item Type:	Journal Article
Subjects:	Q Science > QE Geology T Technology > TN Mining engineering. Metallurgy T Technology > TP Chemical technology
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Clay , Clay -- Moisture, Soil moisture -- Measurement, Soil mechanics
Journal or Publication Title:	Canadian Geotechnical Journal
Publisher:	N R C Research Press
ISSN:	1208-6010
Official Date:	May 2020
Dates:	Date Event May 2020 Published 27 June 2019 Available 27 June 2019 Accepted
Volume:	57
Number:	5
Page Range:	pp. 728-741
DOI:	10.1139/cgj-2018-0398
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	5 July 2019
Date of first compliant Open Access:	10 March 2020

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