Effect of Grain Size and Shape on Undrained Behaviour of Sands

Article

Ghadr, S. and Assadi Langroudi, A. 2019. Effect of Grain Size and Shape on Undrained Behaviour of Sands. International Journal of Geosynthetics and Ground Engineering. 5 (Art. 18). https://doi.org/10.1007/s40891-019-0170-1
AuthorsGhadr, S. and Assadi Langroudi, A.
Abstract

The stress–strain and stress path characteristics of sands are influenced by their grain size, shape, and packing. Morphological characteristics and size of particles play important role on the undrained shear strength of sands. Often, effects of these parameters are complex and cannot be easily distinguished. This study advances the knowledge of the role of particle size and shape on the undrained shear strength of sands. To eliminate the consequence of morphological characteristics, two sands with different particle sizes but similar angularity, and another sand with different roundness were selected for the study. These morphological characteristics for all three sands were determined from the analysis of scanning electron microscope images. F131 sand with higher median grain size and lower shape factors (rᵣ and rₛ) had highest undrained peak shear strength and phase transformation value. Undrained strength (qₚₜ) and effective principal stress (P′ₚₜ) in phase transformation point had direct relationship with grain median grain size (D₅₀) and inversely effect of shape factor (rᵣ and rₛ). F131 and F161 sands represented highest peak and ultimate steady-state strengths, respectively. Flow potential appeared to be directly proportional with (rᵣ and rₛ) and inversely with D₅₀. The peak index decreased with increasing shape factors (rᵣ and rₛ).

JournalInternational Journal of Geosynthetics and Ground Engineering
Journal citation5 (Art. 18)
ISSN2199-9260
Year2019
PublisherSpringer
Accepted author manuscript
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Anyone
Digital Object Identifier (DOI)https://doi.org/10.1007/s40891-019-0170-1
Web address (URL)https://doi.org/10.1007/s40891-019-0170-1
Publication dates
Online04 Jul 2019
Publication process dates
Accepted30 Jun 2019
Deposited23 Jul 2019
Copyright holder© 2019 Springer Nature Switzerland AG.
Copyright informationThis is a post-peer-review, pre-copyedit version of an article published in International Journal of Geosynthetics and Ground Engineering. The final authenticated version is available online at: https://doi.org/10.1007/s40891-019-0170-1.
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