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Cavitation in high-capacity tensiometers : effect of water reservoir surface roughness

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Bagheri, Meghdad, Rezania, Mohammad and Mousavi Nezhad, Mohaddeseh (2018) Cavitation in high-capacity tensiometers : effect of water reservoir surface roughness. Geotechnical Research, 5 (2). pp. 81-95. doi:10.1680/jgere.17.00016 ISSN 2052-6156.

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Official URL: http://dx.doi.org/10.1680/jgere.17.00016

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Abstract

High-capacity tensiometers (HCTs) are sensors made to measure negative pore water pressure (suction) directly. In this paper, a new approach is proposed to expand the range and duration of suction measurements for a newly designed HCT. A new technique is employed to reduce significantly the roughness of the diaphragm’s surface on the water reservoir side in order to minimise the possibility of gas nuclei development and the subsequent early cavitation at the water–diaphragm interface. The procedures employed for the design, fabrication, saturation and calibration of the new tensiometers are explained in detail. Furthermore, the performance of the developed HCTs is examined based on a series of experiments carried out on a number of unsaturated clay specimens. An improvement in maximum sustainable suction in the range of 120–150% of their nominal capacity was obtained from different surface treatment methods. Moreover, the results show an improvement of up to 177% for the long-term stability of measurements, compared to the developed ordinary HCTs with untreated diaphragms.

Item Type: Journal Article
Subjects: S Agriculture > S Agriculture (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Tensiometers, Soil matric potential
Journal or Publication Title: Geotechnical Research
Publisher: ICE Publishing
ISSN: 2052-6156
Official Date: June 2018
Dates:
DateEvent
June 2018Published
20 February 2018Available
15 February 2018Accepted
Volume: 5
Number: 2
Number of Pages: 15
Page Range: pp. 81-95
DOI: 10.1680/jgere.17.00016
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 1 May 2018
Date of first compliant Open Access: 1 May 2018
Open Access Version:
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