Direct shear testing on unsaturated silty soils to investigate the effects of drying and wetting on shear strength parameters at low suction

Gallage, Chaminda & Uchimura, Taro (2016) Direct shear testing on unsaturated silty soils to investigate the effects of drying and wetting on shear strength parameters at low suction. Journal of Geotechnical and Geoenvironmental Engineering, 142(3), Article Number-04015081.

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A modified conventional direct shear device was used to measure unsaturated shear strength of two silty soils at low suction values (0 ~ 50 kPa) that were achieved by following drying and wetting paths of soil water characteristic curves (SWCCs). The results revealed that the internal friction angle of the soils was not significantly affected by either the suction or the drying wetting SWCCs. The apparent cohesion of soil increased with a decreasing rate as suction increased. Shear stress-shear displacement curves obtained from soil specimens subjected to the same net normal stress and different suction values showed a higher initial stiffness and a greater peak stress as suction increased. A soil in wetting exhibited slightly higher peak shear stress and more contractive volume change behavior than that of soil in drying at the same net normal stress and suction.

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ID Code: 90829
Item Type: Journal Article
Refereed: Yes
Keywords: Unsaturated soils, Direct shear tests, Suction, Hysteresis of suction, Unsaturated Shear strength
DOI: 10.1061/(ASCE)GT.1943-5606.0001416
ISSN: 1090-0241
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Facilities: Science and Engineering Centre
Copyright Owner: Copyright 2015 American Society of Civil Engineers
Deposited On: 27 Nov 2015 04:31
Last Modified: 01 Jun 2016 04:59

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