Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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. 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.
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. 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.
DEM study of fabric features governing undrained post-liquefaction shear deformation of sand
Wang, Rui (Autor:in) / Fu, Pengcheng (Autor:in) / Zhang, Jian-Min (Autor:in) / Dafalias, Yannis F. (Autor:in)
Acta Geotechnica ; 11 ; 1321-1337
05.10.2016
17 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DEM , Fabric , Sand liquefaction , Shear deformation , Undrained cyclic biaxial Engineering , Geoengineering, Foundations, Hydraulics , Continuum Mechanics and Mechanics of Materials , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics , Structural Mechanics
DEM study of fabric features governing undrained post-liquefaction shear deformation of sand
| Online Contents | 2016
DEM study of fabric features governing undrained post-liquefaction shear deformation of sand
| British Library Online Contents | 2016
Static liquefaction behavior of saturated fiber-reinforced sand in undrained ring-shear tests
| Online Contents | 2011
Deformation of water-saturated sand: I. uniform undrained deformation and shear banding
| British Library Online Contents | 1996
Post Liquefaction Undrained Monotonic Strength of Sands
| British Library Conference Proceedings | 2007