Modelling Non-coaxiality and Strain Localisation in Sand: the Role of Fabric and Its Evolution

Zhao, J. and Gao, Z. (2014) Modelling Non-coaxiality and Strain Localisation in Sand: the Role of Fabric and Its Evolution. In: 14th International Conference of the International Association for Computer Methods and Advances in Geomechanics (14IACMAG), Kyoto, Japan, 22-25 Sep 2014,

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We present a critical state sand plasticity model accounting for the effect of fabric and its evolution, and apply it to modelling the non-coaxial behaviour and shear localisation phenomenon in sand. The model is developed within the framework of Anisotropic Critical State Theory. A novel fabric evolution law is further proposed to guide the fabric anisotropy evolving towards a unique critical state under continuous shear. The yield surface, hardening law and dilatancy relation of the model feature an explicit dependence on the fabric anisotropy, and are hence affected by its evolution during the deformation of sand. The model formulation leads naturally to a non-coaxial flow rule which enables it to capture the non-coaxial behaviour in sand with ease.We have further applied the model to the prediction of shear localisation in sand.We identify two competing mechanisms dictating the occurrence and further development of shear band in sand, one attributable to the evolution of fabric and the other imposed by the boundary constraints. The study helps to shed light on the fundamental understanding of sand behaviour such as non-coaxility and the phenomenon of strain localisation.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Gao, Dr Zhiwei
Authors: Zhao, J., and Gao, Z.
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Copyright Holders:Copyright © 2014 The Authors
Publisher Policy:Reproduced with permission of Authors
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