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

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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.

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Authors and Affiliations

  1. Civil Engineering Department, Urmia University, 15 km Sero Way, Urmia, Iran

    S. Ghadr & H. Bahadori

  2. Civil Engineering Group, University of East London, London, E16 2RD, England, UK

    A. Assadi-Langroudi

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  1. S. Ghadr
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  2. H. Bahadori
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  3. A. Assadi-Langroudi
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Correspondence to S. Ghadr.

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Ghadr, S., Bahadori, H. & Assadi-Langroudi, A. Anisotropy in Sand–Fibre Composites and Undrained Stress–Strain Implications. Int. J. of Geosynth. and Ground Eng. 5, 23 (2019). https://doi.org/10.1007/s40891-019-0174-x

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