DEM study of fabric features governing undrained post-liquefaction shear deformation of sand
Abstract
In an effort to study undrained post-liquefaction shear deformation of sand, the discrete element method (DEM) is adopted to conduct undrained cyclic biaxial compression simulations on granular assemblies consisting of 2D circular particles. The simulations are able to successfully reproduce the generation and eventual saturation of shear strain through the series of liquefaction states that the material experiences during cyclic loading after the initial liquefaction. Also, DEM simulations with different deviatoric stress amplitudes and initial mean effective stresses on samples with different void ratios and loading histories are carried out to investigate the relationship between various mechanics- or fabric-related variables and post-liquefaction shear strain development. It is found that well-known metrics such as deviatoric stress amplitude, initial mean effective stress, void ratio, contact normal fabric anisotropy intensity, and coordination number, are not adequately correlated to the observed shear strain development and, therefore, could not possibly be used for its prediction. A new fabric entity, namely the Mean Neighboring Particle Distance (MNPD), is introduced to reflect the space arrangement of particles. It is found that the MNPD has an extremely strong and definitive relationship with the post-liquefaction shear strain development, showing MNPD’s potential role as a parameter governing post-liquefaction behavior ofmore »
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1328542
- Alternate Identifier(s):
- OSTI ID: 1341944
- Report Number(s):
- LLNL-JRNL-681216
Journal ID: ISSN 1861-1125; PII: 499
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Published Article
- Journal Name:
- Acta Geotechnica
- Additional Journal Information:
- Journal Name: Acta Geotechnica Journal Volume: 11 Journal Issue: 6; Journal ID: ISSN 1861-1125
- Publisher:
- Springer Science + Business Media
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 42 ENGINEERING; 58 GEOSCIENCES; DEM; Fabric; Sand liquefaction; Shear deformation; Undrained cyclic biaxial
Citation Formats
Wang, Rui, Fu, Pengcheng, Zhang, Jian-Min, and Dafalias, Yannis F. DEM study of fabric features governing undrained post-liquefaction shear deformation of sand. Germany: N. p., 2016.
Web. doi:10.1007/s11440-016-0499-8.
Wang, Rui, Fu, Pengcheng, Zhang, Jian-Min, & Dafalias, Yannis F. DEM study of fabric features governing undrained post-liquefaction shear deformation of sand. Germany. https://doi.org/10.1007/s11440-016-0499-8
Wang, Rui, Fu, Pengcheng, Zhang, Jian-Min, and Dafalias, Yannis F. Wed .
"DEM study of fabric features governing undrained post-liquefaction shear deformation of sand". Germany. https://doi.org/10.1007/s11440-016-0499-8.
@article{osti_1328542,
title = {DEM study of fabric features governing undrained post-liquefaction shear deformation of sand},
author = {Wang, Rui and Fu, Pengcheng and Zhang, Jian-Min and Dafalias, Yannis F.},
abstractNote = {In an effort to study undrained post-liquefaction shear deformation of sand, the discrete element method (DEM) is adopted to conduct undrained cyclic biaxial compression simulations on granular assemblies consisting of 2D circular particles. The simulations are able to successfully reproduce the generation and eventual saturation of shear strain through the series of liquefaction states that the material experiences during cyclic loading after the initial liquefaction. Also, DEM simulations with different deviatoric stress amplitudes and initial mean effective stresses on samples with different void ratios and loading histories are carried out to investigate the relationship between various mechanics- or fabric-related variables and post-liquefaction shear strain development. It is found that well-known metrics such as deviatoric stress amplitude, initial mean effective stress, void ratio, contact normal fabric anisotropy intensity, and coordination number, are not adequately correlated to the observed shear strain development and, therefore, could not possibly be used for its prediction. A new fabric entity, namely the Mean Neighboring Particle Distance (MNPD), is introduced to reflect the space arrangement of particles. It is found that the MNPD has an extremely strong and definitive relationship with the post-liquefaction shear strain development, showing MNPD’s potential role as a parameter governing post-liquefaction behavior of sand.},
doi = {10.1007/s11440-016-0499-8},
journal = {Acta Geotechnica},
number = 6,
volume = 11,
place = {Germany},
year = {Wed Oct 05 00:00:00 EDT 2016},
month = {Wed Oct 05 00:00:00 EDT 2016}
}
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https://doi.org/10.1007/s11440-016-0499-8
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Works referencing / citing this record:
3D DEM simulation of principal stress rotation in different planes of cross‐anisotropic granular materials
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