Loess as a Collapsible Soil: Some Basic Particle Packing

Article


Assadi Langroudi, A., Ng’ambi, Samson and Smalley, Ian 2017. Loess as a Collapsible Soil: Some Basic Particle Packing. Quaternary International. 469 (Part A), pp. 20-29.
AuthorsAssadi Langroudi, A., Ng’ambi, Samson and Smalley, Ian
Abstract

Loess is the most important collapsible soil; possibly the only engineering soil in which real collapse occurs. A real collapse involves a diminution in volume - it would be an open metastable packing being reduced to a more closely packed, more stable structure. Metastability is at the heart of the collapsible soils problem. To envisage and to model the collapse process in a metastable medium, knowledge is required about the nature and shape of the particles, the types of packings they assume (real and ideal), and the nature of the collapse process - a packing transition upon a change to the effective stress in a media of double porosity. Particle packing science has made little progress in geoscience discipline - since the initial packing paradigms set by Graton and Fraser (1935) - nevertheless is relatively well-established in the soft matter physics discipline. The collapse process can be represented by mathematical modelling of packing – including the Monte Carlo simulations - but relating representation to process remains difficult. This paper revisits the problem of sudden packing transition from a micro-physico-mechanical viewpoint (i.e. collapse imetan terms of structure-based effective stress). This cross-disciplinary approach helps in generalization on collapsible soils to be made that suggests loess is the only truly collapsible soil, because it is only loess which is so totally influenced by the packing essence of the formation process.

KeywordsLoess; Structures; Packing transitions; Shapes
JournalQuaternary International
Journal citation469 (Part A), pp. 20-29
ISSN1040-6182
Year2017
PublisherElsevier for International Union for Quaternary Research
Accepted author manuscript
License
CC BY-NC-ND
Digital Object Identifier (DOI)doi:10.1016/j.quaint.2016.09.058
Publication dates
Print01 Mar 2017
Publication process dates
Deposited30 Sep 2016
Accepted24 Sep 2016
Accepted24 Sep 2016
Copyright information© 2016 Elsevier.
LicenseCC BY-NC-ND 3.0
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