Investigating the use of Boyle's Law to relate pore air pressures and volume changes in unsaturated triaxial samples
Investigating the use of Boyle's Law to relate pore air pressures and volume changes in unsaturated triaxial samples
Measuring the volume changes of unsaturated triaxial soil samples is one of the main challenges when performing unsaturated triaxial tests. Under fully undrained conditions, Boyle's Law can be used to calculate the sample's volume changes caused by the compression of air, as Boyle's Law relates changes in volume to changes in pore air pressures within the sample. This method has been used to calculate the volumetric strains and pore air pressures in unsaturated samples tested under cyclic loading conditions. However, the volume changes calculated from using Boyle's Law and the increases in pore air pressures, have not been compared with the actual measured volume changes of unsaturated samples. This study presents the pore pressures and compares the measured and predicted volumetric strains calculated from using Boyle's Law, in unsaturated triaxial samples that were tested cyclically. In some cases, using Boyle's Law was found to be similar to the volume changes estimated from direct measurement, but sometimes the method did not appear to work. Reasons for the discrepancies will also be discussed.
Kwa, Katherine
18faee0d-75d9-4683-a2c8-604625eecbb0
Airey, David
068f1c7a-f649-4df6-87e1-3f72065908fe
2019
Kwa, Katherine
18faee0d-75d9-4683-a2c8-604625eecbb0
Airey, David
068f1c7a-f649-4df6-87e1-3f72065908fe
Kwa, Katherine and Airey, David
(2019)
Investigating the use of Boyle's Law to relate pore air pressures and volume changes in unsaturated triaxial samples.
E3S Web of Conferences, 92, [07001].
(doi:10.1051/e3sconf/20199207001).
Abstract
Measuring the volume changes of unsaturated triaxial soil samples is one of the main challenges when performing unsaturated triaxial tests. Under fully undrained conditions, Boyle's Law can be used to calculate the sample's volume changes caused by the compression of air, as Boyle's Law relates changes in volume to changes in pore air pressures within the sample. This method has been used to calculate the volumetric strains and pore air pressures in unsaturated samples tested under cyclic loading conditions. However, the volume changes calculated from using Boyle's Law and the increases in pore air pressures, have not been compared with the actual measured volume changes of unsaturated samples. This study presents the pore pressures and compares the measured and predicted volumetric strains calculated from using Boyle's Law, in unsaturated triaxial samples that were tested cyclically. In some cases, using Boyle's Law was found to be similar to the volume changes estimated from direct measurement, but sometimes the method did not appear to work. Reasons for the discrepancies will also be discussed.
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e3sconf_isg2019_07001
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e-pub ahead of print date: 25 June 2019
Published date: 2019
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Local EPrints ID: 435490
URI: http://eprints.soton.ac.uk/id/eprint/435490
ISSN: 2267-1242
PURE UUID: f0f3ac58-978e-4b18-b1ee-d2175507baa2
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Date deposited: 08 Nov 2019 17:30
Last modified: 17 Mar 2024 03:57
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David Airey
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