期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 188, 期 -, 页码 210-222出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2019.10.013
关键词
Anisotropic critical state theory; fabric evolution; dilatancy; DEM
类别
资金
- Tsinghua University Initiative Scientific Research Program [2019Z08QCX01]
- State Key Laboratory of Hydroscience and Engineering Open Research Fund Program [sklhse-2018-C-02, 2018-KY-04]
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- European Research Council under the European Union [290963]
- General Secretariat for Research and Technology of Greece (Matching Funds Program)
- European Regional Development Fund, Czech Republic [CZ.02.1.01/0.0/0.0/15_003/0000493 - CeNDYNMAT]
Fabric, expressed by means of an evolving deviatoric fabric tensor F, plays a very important role in the anisotropic mechanical response of granular materials. The Anisotropic Critical State Theory (ACST) addresses fabric anisotropy by rendering dilatancy a function of F, in addition to other state variables. In this paper, 3D DEM is used to guide the specific grain-level definition of F, the formulation of its continuum evolution equation and its effect on anisotropic dilatancy within ACST. DEM provides stress-ratio and shear strain variations as input for ACST analytical calculations of evolving fabric tensor and dilatancy, which are then favourably compared with totally independent direct measurements of these quantities by DEM. Dilatancy is shown to be strongly affected by the contact normal-based fabric tensor F-c, whose evolution is best described by a continuum equation within ACST that includes dilatancy and a quantity related to particle orientation-based fabric tensor F-p. The aforementioned favourable comparison of the results for fabric tensor and dilatancy obtained independently by ACST and DEM, confirms the validity of the core framework of ACST irrespective of any constitutive model that addresses the deviatoric stress-strain relations. (C) 2019 Elsevier Ltd. All rights reserved.
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