Anisotropy in Sand–Fibre Composites and Undrained Stress–Strain Implications

Article


Ghadr, S., Bahadori, H. and Assadi Langroudi, A. 2019. Anisotropy in Sand–Fibre Composites and Undrained Stress–Strain Implications. International Journal of Geosynthetics and Ground Engineering. 5 (Art. 23). https://doi.org/10.1007/s40891-019-0174-x
AuthorsGhadr, S., Bahadori, H. and Assadi Langroudi, A.
Abstract

Among the plethora of studies on anisotropy in fibre-reinforced sands, there exist conflicting views on effects on the steady-state deformations of initial packing. These conflicting views are further confused by strictly limited experimental evidence on flow in complex loading environments where the principal stresses rotate whereby shearing and torsional stresses combine, and when extension in soil relieves the compressive stresses. In the heuristic of intrinsically anisotropic nature of the soil and in recognition of the inability of placement methods to overcome such anisotropy, this paper aims to use the orientation of principal stress and soil initial packing state combined as proxy parameters to further the knowledge of plastic behaviour in fibre-reinforced sands. This study furthers the knowledge of the dependency of steady states on anisotropy in composite geomaterials. In doing so, the direction of principal stress orientation is varied from 15° to 60° (from vertical axis), taking an intermediate principal stress ratio of 0.5 and 1.0 and two initial confining pressures. Twenty-four undrained torsional shear tests are conducted using a hollow cylindrical torsional shear apparatus. Under compression and plain strain conditions, torsional stresses limit the improvements in soils’ undrained shear strength upon fibre reinforcement. Extension in soil remarkably increases fibres’ contribution to betterment of undrained strength. Fibres are least effective under low isotropic confining pressures and also for certain ranges of torsional stresses.

JournalInternational Journal of Geosynthetics and Ground Engineering
Journal citation5 (Art. 23)
ISSN2199-9260
Year2019
PublisherSpringer Verlag
Accepted author manuscript
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Anyone
Digital Object Identifier (DOI)https://doi.org/10.1007/s40891-019-0174-x
Web address (URL)https://doi.org/10.1007/s40891-019-0174-x
Publication dates
Online06 Aug 2019
Publication process dates
Accepted26 Jul 2019
Deposited13 Aug 2019
Copyright holder© 2019 Springer.
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: http://dx.doi.org/10.1007/s40891-019-0174-x.
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