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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
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Official URL: http://dx.doi.org/10.1680/jgere.17.00016
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 | ||||||||
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| Subjects: | S Agriculture > S Agriculture (General) T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science > 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: |
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| 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 | ||||||||
| Open Access Version: |
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