Finite element analysis of large deformation for progressive failure of soil based on Cosserat continuum theory

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-10-17 DOI:10.1016/j.compgeo.2024.106836

Hongxiang Tang , Binbin Xu , Wencheng Wei , Letian Liu , Fabing Sun

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引用次数: 0

Abstract

The large deformation accompanied by strain softening and strain localization of the material is usually encountered in geotechnical engineering. Integrating the RITSS method and the Cosserat continuum theory, a large deformation Cosserat-RITSS finite element method is developed to tackle this issue. Based on the second development interfaces of UEL and SDVINI offered by the finite element software ABAQUS, the Cosserat-RITSS method adopting the MUEM interpolation and mapping method is realized automatically and used to simulate the problem of progressive failure and large deformation characterized by strain localization. The accuracy and effectiveness of the proposed method are verified by the comparison of the small deformation and the large deformation analysis of the penetration process of a rigid strip foundation. Further, the Cosserat-RITSS method is used to analyze the large deformation of a retaining wall resisting on the soil with non-associated plastic flow and strain-softening properties. Compared with the classical RITSS method, it is demonstrated that the proposed method has better performancy of simulating large deformation and overcoming the pathological mesh-dependent problem usually suffered in the classical FEA of large deformation accompanied by strain localization.

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基于 Cosserat 连续体理论的土壤渐进破坏大变形有限元分析

岩土工程中通常会遇到伴随材料应变软化和应变局部化的大变形。综合 RITSS 方法和 Cosserat 连续理论，开发了一种大变形 Cosserat-RITSS 有限元方法来解决这一问题。基于有限元软件 ABAQUS 提供的 UEL 和 SDVINI 二次开发接口，采用 MUEM 插值和映射方法自动实现了 Cosserat-RITSS 方法，用于模拟以应变局部化为特征的渐进破坏和大变形问题。通过对刚性带状地基贯入过程的小变形和大变形分析对比，验证了所提方法的准确性和有效性。此外，Cosserat-RITSS 方法还用于分析具有非相关塑性流动和应变软化特性的土体上挡土墙的大变形。结果表明，与传统的 RITSS 方法相比，所提出的方法在模拟大变形方面具有更好的性能，并克服了传统有限元分析中通常存在的大变形伴随应变局部化的病态网格依赖问题。

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.