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Particle loss: An initial investigation into size effects and stress-dilatancy

McDougall, John; Kelly, Darren; Daniel, Barreto

Authors

Darren Kelly



Abstract

Drained triaxial tests have been performed to explore the effect of particle loss on shearing behaviour and critical states in granular mixtures. The mixtures comprise Leighton Buzzard sand (d50 = 0.8 mm), to which was added 15% by mass of salt particles of different nominal sizes: 0.063 mm, 0.25 mm and 0.5 mm. Shearing behaviours before and after particle loss (by dissolution) were compared. A good fit is observed between the test data and a stress-dilatancy relationship for the post-dissolution tests, highlighting the ability of the stressdilatancy analysis as a means to interpret the effects of particle loss on shearing. It was noted that critical state strength parameter M is determined by the post-dissolution grading regardless of size of removed particle. However, the duration of contractant volumetric strain increased with the larger removed particles (0.25 mm & 0.5 mm) even when initial specific volumes were virtually identical. It is suggested that a loose volumetric state is reached if the sand particle network is initially disrupted by the amount and/or size of salt particles, which following dissolution results in structural or fabric phenomena that are not reflected in scalar volumetric measures such as specific volume.

Citation

McDougall, J., Kelly, D., & Daniel, B. (2019). Particle loss: An initial investigation into size effects and stress-dilatancy. Soils and Foundations, https://doi.org/10.1016/j.sandf.2019.03.002

Journal Article Type Article
Acceptance Date Mar 5, 2019
Online Publication Date Apr 27, 2019
Publication Date 2019-06
Deposit Date Mar 15, 2019
Publicly Available Date Mar 29, 2024
Journal Soils and Foundations
Print ISSN 0038-0806
Publisher Elsevier
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1016/j.sandf.2019.03.002
Keywords Soluble soils, particle loss, laboratory testing, triaxial testing, stress-dilatancy
Public URL http://researchrepository.napier.ac.uk/Output/1568493

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