Discrete modeling of geotextile-wrapped soil under simple shear

H. Cheng, H. Yamamoto

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

2 Citations (Scopus)

Abstract

Geosynthetic Reinforced Soil (GRS) is widely used in infrastructure projects such as retaining wall and road/railway subgrade for technical and economical reasons. Despite of the worldwide usage, the basic mechanism of such reinforcement remains obscure, owing to its discontinuous and heterogeneous nature. Instead of being layered by planar geosynthetic sheets, soil can be wrapped entirely in geosynthetic containers as soilbags, which improves bearing capacity and contains the dilatancy of soil. To gain insights into soilbag reinforcement mechanisms and facilitate the development of soilbag's constitutive relation, the authors numerically investigated the micromechanical behavior of the GRS inside a woven geotextile soilbag under simple shear, by using the Discrete Element Method (DEM). Global and local stress states and fabric anisotropies in the GRS were investigated. With sustained shear, the global stress path first approaches the critical state line of the GRS and then turns to soilbag's compression line. Meanwhile, local loading-unloading stress paths are experienced, which may account for high damping of soilbags in cyclic shear. The reducing fabric anisotropies of normal and tangential force chains suggest greater confinement from the lateral sides of the geotextile container during simple shear. With new findings in the stress states and the fabric anisotropies of the wrapped GRS, the confinement mechanism of soilbag is better understood.

Original languageEnglish
Title of host publicationProceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015
PublisherInternational Center for Numerical Methods in Engineering
Pages485-496
Number of pages12
ISBN (Electronic)9788494424472
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • DEM
  • Fabric anisotropy
  • Soilbag reinforcement
  • Stress path
  • Woven geotextile

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  • Cite this

    Cheng, H., & Yamamoto, H. (2015). Discrete modeling of geotextile-wrapped soil under simple shear. In Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015 (pp. 485-496). International Center for Numerical Methods in Engineering.