Multiscale Study of the Nonlinear Behavior of Heterogeneous Clayey Rocks Based on the FFT Method

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• 作者：Tao Jiang (1)
  Weiya Xu (2)
  Jianfu Shao (2) (3)
  
  1. Multiscale Design Systems LLC ; 280 Park Ave ; New York ; NY ; 10010 ; USA
  2. College of Civil and Transportation Engineering ; Hohai University ; Nanjing ; 210098 ; China
  3. LML ; UMR8107 CNRS ; University of Lille I ; 59655 ; Villeneuve d鈥橝scq ; France
  
• 关键词：Multiscale mechanics ; Heterogeneous ; Homogenization ; Geomaterials ; Clayey rocks ; FFT
• 刊名：Rock Mechanics and Rock Engineering
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：48
• 期：2
• 页码：417-426
• 全文大小：1,596 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Civil Engineering
  
• 出版者：Springer Wien
• ISSN：1434-453X

文摘

A multiscale model based on the fast Fourier transform (FFT) is applied to study the nonlinear mechanical behavior of Callovo-Oxfordian (COx) argillite, a typical heterogeneous clayey rocks. COx argillite is modeled as a three-phase composite with a clay matrix and two types of mineral inclusions. The macroscopic mechanical behavior of argillite samples with different mineralogical compositions are satisfactorily predicted by unified local constitutive models and material parameters. Moreover, the numerical implementation of the FFT-based nonlinear homogenization is easier than direct homogenization, such as the FEM-based homogenization, because it automatically satisfies the periodic boundary condition.