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Title: DEM analysis of the post-liquefaction shear deformation of sand

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1395526
Report Number(s):
LLNL-CONF-716441
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul, South Korea, Sep 17 - Sep 22, 2017
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 42 ENGINEERING

Citation Formats

Wang, R, Fu, P, Zhang, J M, and Dafalias, Y F. DEM analysis of the post-liquefaction shear deformation of sand. United States: N. p., 2017. Web.
Wang, R, Fu, P, Zhang, J M, & Dafalias, Y F. DEM analysis of the post-liquefaction shear deformation of sand. United States.
Wang, R, Fu, P, Zhang, J M, and Dafalias, Y F. Mon . "DEM analysis of the post-liquefaction shear deformation of sand". United States. doi:. https://www.osti.gov/servlets/purl/1395526.
@article{osti_1395526,
title = {DEM analysis of the post-liquefaction shear deformation of sand},
author = {Wang, R and Fu, P and Zhang, J M and Dafalias, Y F},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 02 00:00:00 EST 2017},
month = {Mon Jan 02 00:00:00 EST 2017}
}

Conference:
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  • 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 variablesmore » 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.« less
    Cited by 2
  • 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 variablesmore » 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.« less
  • Abstract not provided.
  • The distribution of elastoplastic stresses and strains in cracked adhesive bonds subjected to shear loading was determined from a large-strain, quasi-static finite element analysis. The adhesive post-yield behavior was modeled by the J{sub 2} criterion with associated flow rule, and isotropic strain hardening was considered. A narrow zone of intense plastic deformation dominated by shear was developed at the very edge of the crack tip. The shear strain within that zone was several times the average shear strain at the crack tip. Increasing adhesive strain hardening or decreasing bond thickness tended to reduce strain localization; for a 0.4 mm andmore » an 18 {micro}m thick bonds, the interlayer shear strain became homogeneous starting from approximately 2.4 mm and 25 {micro}m ahead of the crack tip, respectively. The variations with load of the plastic zone length and of the average shear strain at the crack tip agreed well with experimental results. The mean-stress in the interlayer was found to increase with decreasing bond thickness. Its maximum, which always occurred at the very edge of the crack tip, did not exceed the uniaxial yield stress for all bond thicknesses attempted.« less