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Effect of soil moisture evaporation rate on dynamic measurement of water retention curve with high capacity tensiometer

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Bagheri, Meghdad and Rezania, Mohammad (2022) Effect of soil moisture evaporation rate on dynamic measurement of water retention curve with high capacity tensiometer. International Journal of Geomechanics, 22 (3). 04021301. doi:10.1061/(ASCE)GM.1943-5622.0002291

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Official URL: https://doi.org/10.1061/(ASCE)GM.1943-5622.0002291

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Abstract

This paper investigates the effect of soil moisture evaporation rate on the soil water retention curve (SWRC) of clays obtained using high-capacity tensiometer (HCT) technique and following the continuous drying (dynamic) method. SWRC measurements, with and without soil moisture evaporation rate control, were carried out on reconstituted London clay specimens using 12 performance-improved HCTs recently developed at the University of Warwick. Furthermore, the HCTs’ performance in terms of the maximum attainable suction (smax) and maximum measurement duration (tmax) was evaluated. Moreover, the suitability of a curve fitting-based model, available in the literature, for attaining the entire retention curve (beyond the capacity of HCTs) was evaluated. The SWRCs for tests with controlled evaporation rate were found to be generally exhibiting higher suctions at a given water content, hence inducing air-entry values that were on average 16% higher than those obtained from tests without evaporation rate control. It was also found that for suctions beyond 2 MPa, the curve fitting-based model predictions of data obtained from tests with controlled evaporation rate exhibit significantly lower suctions at a given water content than those without evaporation rate control, suggesting that such curve fitting correlations should be used with caution.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Soil moisture , Soil absorption and adsorption, Soil moisture -- Measurement, Tensiometers , Evaporation control
Journal or Publication Title: International Journal of Geomechanics
Publisher: American Society of Civil Engineers
ISSN: 1532-3641
Official Date: March 2022
Dates:
DateEvent
March 2022Published
22 December 2021Available
31 October 2021Accepted
Volume: 22
Number: 3
Article Number: 04021301
DOI: 10.1061/(ASCE)GM.1943-5622.0002291
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://doi.org/10.1061/(ASCE)GM.1943-5622.0002291
Access rights to Published version: Restricted or Subscription Access

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