Tensile strain-rate dependency of pore water pressure and failure strength of soil

Hallett, Paul D., Baumgartl, Thomas, Seville, Jonathan P. K., Horn, Rainer and Dexter, Anthony R. (2014) Tensile strain-rate dependency of pore water pressure and failure strength of soil. Vadose Zone Journal, 13 5: . doi:10.2136/vzj2013.06.0098

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Author Hallett, Paul D.
Baumgartl, Thomas
Seville, Jonathan P. K.
Horn, Rainer
Dexter, Anthony R.
Title Tensile strain-rate dependency of pore water pressure and failure strength of soil
Journal name Vadose Zone Journal   Check publisher's open access policy
ISSN 1539-1663
Publication date 2014-01-01
Sub-type Article (original research)
DOI 10.2136/vzj2013.06.0098
Open Access Status Not yet assessed
Volume 13
Issue 5
Total pages 6
Place of publication Madison, WI, United States
Publisher Soil Science Society of America
Language eng
Abstract With a tensiometer <1 mm in diameter, we demonstrated a direct impact of strain rate induced changes to capillary pressure on the tensile strength of soil. This work is relevant to understanding soil cultivation, crack formation in soil caused by desiccation, and the selection of strain rates for static testing of soils. Microtensiometer probes with a tip radius <1 mm were used for direct measurement of the change in pore water pressure caused by tensile loading at different strain rates in soils. These probes responded rapidly to changes in pore water pressure during testing and demonstrated that the applied tensile stress was transmitted almost entirely through the pore water, as would be expected. Above a strain rate of 1% min-1, viscous effects became significant, leading to a significant increase in the fracture stress. The results are described using an extended version of the Kelvin-Voigt model of rheological behavior. At low strain rates, capillary forces dominate the fracture stress. Above the critical strain rate, the viscosity of the soil also contributes to the fracture stress.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
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Created: Wed, 14 May 2014, 03:53:08 EST by Thomas Baumgartl on behalf of Centre For Mined Land Rehabilitation