Nonlocal Regularization of an Anisotropic Critical State Model for Sand

Gao, Z. W. , Li, X. and Lu, D.C. (2023) Nonlocal Regularization of an Anisotropic Critical State Model for Sand. In: 10th European Conference on Numerical Methods in Geotechnical Engineering, London, 26-28 June 2023, (doi: 10.53243/NUMGE2023-123)

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Abstract

Many advanced constitutive models which can capture the strain-softening and state-dependent dilatancy response of sand have been developed. These models can give a good prediction of the single soil element behaviour under various loading conditions. But the solution will be highly mesh-dependent when they are used in real boundary value problems due to the strain-softening. They can give mesh-dependent strain localization patterns and bearing capacity of foundations on sand. Nonlocal regularization of an anisotropic critical state sand model is presented. The evolution of void ratio which has a significant influence on strain-softening is assumed to depend on the volumetric strain increment of both the local and neighbouring integration points. The nonlocal model has been used in simulating both drained and undrained plane strain compression. In plane strain compression, mesh-independent results for the force-displacement relationship and shear band thickness can be obtained when the mesh size is smaller than the internal length. The regularization method is thus proper for application in practical geotechnical engineering problems.

Item Type:Conference Proceedings
Additional Information:The third author would like to acknowledge the financial support of the National Natural Science Foundation of China (No. 52025084).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gao, Dr Zhiwei and Li, Xin
Authors: Gao, Z. W., Li, X., and Lu, D.C.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
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