Fabric characteristics and processes influencing the liquefaction and re-liquefaction of sand
Abstract
Although the density of sand has long been considered to be the predominant factor for liquefaction resistance, observations during earthquake sequences and laboratory tests have suggested that other factors may also cause significant anomalies in the relationship between density and liquefaction resistance. This study pinpoints the fabric characteristics and processes influencing the liquefaction resistance of sand. Numerical DEM tests on 2D polydispersed circular granular material are conducted on specimens with various stress-strain and liquefaction histories, showing that changes in micromechanical fabric characteristics of sand can indeed influence its liquefaction resistance, even overpowering the influence of overall density under certain conditions. The liquefaction resistance of initially isotropic sand is strongly correlated with the amount of increase in mean neighboring particle distance needed for it to reach liquefaction (ΔMNPDliq). Smaller ΔMNPDliq results in weaker liquefaction resistance. Furthermore, fabric anisotropy also significantly affects the liquefaction resistance of sand, due to its influence on dilatancy. Greater fabric anisotropy intensity results in smaller liquefaction resistance. The findings in this study enhances the understanding of liquefaction behavior of sand by establishing a link between the changes in quantifiable fabric states and liquefaction resistance.
- Authors:
-
- Tsinghua Univ., Beijing (China)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, Davis, CA (United States); National Technical Univ. of Athens (Greece)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); European Research Council (ERC)
- OSTI Identifier:
- 1604281
- Alternate Identifier(s):
- OSTI ID: 1547167
- Report Number(s):
- LLNL-JRNL-784541
Journal ID: ISSN 0267-7261; 978946
- Grant/Contract Number:
- AC52-07NA27344; 290963
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Soil Dynamics and Earthquake Engineering
- Additional Journal Information:
- Journal Volume: 125; Journal Issue: C; Journal ID: ISSN 0267-7261
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Liquefaction resistance; Reconsolidation; Mean neighboring particle distance; Fabric anisotropy; DEM
Citation Formats
Wang, Rui, Fu, Pengcheng, Zhang, Jian-Min, and Dafalias, Yannis F. Fabric characteristics and processes influencing the liquefaction and re-liquefaction of sand. United States: N. p., 2019.
Web. doi:10.1016/j.soildyn.2019.105720.
Wang, Rui, Fu, Pengcheng, Zhang, Jian-Min, & Dafalias, Yannis F. Fabric characteristics and processes influencing the liquefaction and re-liquefaction of sand. United States. https://doi.org/10.1016/j.soildyn.2019.105720
Wang, Rui, Fu, Pengcheng, Zhang, Jian-Min, and Dafalias, Yannis F. Mon .
"Fabric characteristics and processes influencing the liquefaction and re-liquefaction of sand". United States. https://doi.org/10.1016/j.soildyn.2019.105720. https://www.osti.gov/servlets/purl/1604281.
@article{osti_1604281,
title = {Fabric characteristics and processes influencing the liquefaction and re-liquefaction of sand},
author = {Wang, Rui and Fu, Pengcheng and Zhang, Jian-Min and Dafalias, Yannis F.},
abstractNote = {Although the density of sand has long been considered to be the predominant factor for liquefaction resistance, observations during earthquake sequences and laboratory tests have suggested that other factors may also cause significant anomalies in the relationship between density and liquefaction resistance. This study pinpoints the fabric characteristics and processes influencing the liquefaction resistance of sand. Numerical DEM tests on 2D polydispersed circular granular material are conducted on specimens with various stress-strain and liquefaction histories, showing that changes in micromechanical fabric characteristics of sand can indeed influence its liquefaction resistance, even overpowering the influence of overall density under certain conditions. The liquefaction resistance of initially isotropic sand is strongly correlated with the amount of increase in mean neighboring particle distance needed for it to reach liquefaction (ΔMNPDliq). Smaller ΔMNPDliq results in weaker liquefaction resistance. Furthermore, fabric anisotropy also significantly affects the liquefaction resistance of sand, due to its influence on dilatancy. Greater fabric anisotropy intensity results in smaller liquefaction resistance. The findings in this study enhances the understanding of liquefaction behavior of sand by establishing a link between the changes in quantifiable fabric states and liquefaction resistance.},
doi = {10.1016/j.soildyn.2019.105720},
journal = {Soil Dynamics and Earthquake Engineering},
number = C,
volume = 125,
place = {United States},
year = {Mon Jun 17 00:00:00 EDT 2019},
month = {Mon Jun 17 00:00:00 EDT 2019}
}
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Figures / Tables:
Fig. 1: Specimen preparation method and loading scheme: (a) deposition of the master pack and extraction of the test specimen; (b) isotropic consolidation of the specimen and the nine sub-regions for verifying homogeneity; (c) “strain controlled” undrained cyclic biaxial loading scheme. x and y represent the horizontal and vertical directions,more »
Figures / Tables found in this record: