Liquefaction resistance of fibre-reinforced silty sands under cyclic loading

Article


Ghadr, S., Samadzadeh, A., Bahadori, H. and Assadi Langroudi, A. 2020. Liquefaction resistance of fibre-reinforced silty sands under cyclic loading. Geotextiles and Geomembranes. https://doi.org/10.1016/j.geotexmem.2020.07.002
AuthorsGhadr, S., Samadzadeh, A., Bahadori, H. and Assadi Langroudi, A.
Abstract

Whether the so-called double porosity in soils with a loose and natural packing state is a concept with real-world implications is a fundamental yet controversial question in the study of cyclic undrained shear behaviour of fibre-reinforced silty sands. An attempt is made here to clarify the question by means of particle-level modelling combined with 41 undrained cyclic triaxial shear tests. The study shows that the initial Random Loose Packing changes to Random Close Packing and then Close Packing with silt content increments. The transition from random to close packing occurs at a threshold silt content which is relatively lower in coarser sands. For sands with <40% silt content, the rate of pore pressure growth with loading-unloading cycles increase with silt content increment. Reverse trend applies to silty sands with >40% silt content. Irrespective of fine content, fibres tend to sit deep into the silt pellets and encrust the macro-pore spaces. Generally, increasing fibre content leads to an increase in the average number of contacts per particle, dilation and easier dissipation of excess pore water pressure, a decrease in contact forces and improved liquefaction resistance. For sands with >40% silt content, effectiveness of fibre reinforcement diminishes with increasing sand median size.

JournalGeotextiles and Geomembranes
ISSN0266-1144
Year2020
PublisherElsevier
Accepted author manuscript
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Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.geotexmem.2020.07.002
Publication dates
Online03 Sep 2020
Publication process dates
Accepted06 Jul 2020
Deposited07 Sep 2020
Copyright holder© 2020 Elsevier
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