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A stress integration scheme for elasto-plastic response of unsaturated soils subjected to large deformations

机译：大变形下非饱和土弹塑性响应的应力积分方案

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摘要

This paper proposes an algorithm for performing explicit integration of constitutive models for unsaturated soils in problems where consideration of stress rate objectivity becomes necessary due to large deformations. As many constitutive models for unsaturated soils incorporate suction forces, as well as stresses and strains, into the material description, an accurate integration procedure is more complicated than similar schemes proposed for saturated soils. The difficulties of integration are also coupled with the need to incorporate objectivity (frame independency) within the integration procedure. Application of the proposed method is limited to constitutive models that assume additive decomposition of the strains. A fully coupled finite deformation numerical model is considered with displacement, pore water pressure and suction as the nodal variables. Details of the implementation of the stress integration algorithm at each stage of an analysis are given. The algorithm is then applied to solve some large-scale geotechnical problems. Numerical examples are also provided to assess the performance of the algorithm under different loading conditions.
机译：本文提出了一种算法，用于在由于大变形而需要考虑应力率客观性的问题中，对非饱和土的本构模型进行显式积分。由于许多非饱和土的本构模型将吸力以及应力和应变纳入材料描述，因此，精确的积分程序比针对饱和土提出的类似方案更为复杂。集成的困难还与在集成过程中合并客观性（帧独立性）的需求相关。所提出方法的应用仅限于假定应变加法分解的本构模型。考虑位移，孔隙水压力和吸力为节点变量的全耦合有限变形数值模型。给出了在分析的每个阶段实施应力积分算法的详细信息。然后将该算法应用于解决一些大型岩土工程问题。还提供了数值示例来评估算法在不同加载条件下的性能。

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  • 来源
    《Computers and Geotechnics》 |2018年第2期|231-246|共16页
  • 作者

    Ghorbani Javad; Nazem Majidreza; Carter John P.; Sloan Scott W.;

  • 作者单位

    Univ Sydney, Sch Civil Engn, Sydney, NSW 2006, Australia;

    RMIT Univ, Sch Engn, Melbourne, Vic 3000, Australia;

    Univ Newcastle, ARC Ctr Excellence Geotech Sci & Engn, Newcastle, NSW 2308, Australia;

    Univ Newcastle, ARC Ctr Excellence Geotech Sci & Engn, Newcastle, NSW 2308, Australia;

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