An analytical solution for geotextile-wrapped soil based on insights from DEM analysis

Hongyang Cheng, Haruyuki Yamamoto, Klaus Thoeni, Yang Wu

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

This paper presents a novel analytical solution for geotextile-wrapped soil based on a comprehensive numerical analysis conducted using the discrete element method (DEM). By examining the soil–geotextile interface friction, principal stress distribution, and stress–strain relations of the constituent soil and geotextile in the DEM analysis, a complete picture of the mechanical characterization of geotextile-wrapped soil under uniaxial compression is first provided. With these new insights, key assumptions are verified and developed for the proposed analytical solution. In the DEM analysis, a near-failure state line that predicts stress ratios relative to the maximums at failure with respect to deviatoric strain is uniquely identified; dilation rates are found to be related to stress ratios via a single linear correlation regardless of the tensile stiffness of the geotextile. From these new findings, the assumptions on the stress-state evolution and the stress–dilatancy relation are developed accordingly, and the wrapped granular soil can therefore be modeled as a Mohr–Coulomb elastoplastic solid with evolving stress ratio and dilation rate. The development of the proposed analytical model also demonstrates an innovative approach to take advantage of multiscale insights for the analytical modeling of complex geomaterials. The analytical model is validated with the DEM simulation results of geotextile-wrapped soil under uniaxial compression, considering a wide range of geotextile tensile stiffnesses. To further examine the predictive capacity of the analytical model, the stress–strain response under triaxial compression conditions is solved analytically, taking both different confining pressures and geotextile tensile stiffnesses into account. Good agreement is obtained between the analytical and DEM solutions, which suggests that the key assumptions developed in the uniaxial compression conditions also remain valid for triaxial compression conditions.

Original languageEnglish
Pages (from-to)361-376
Number of pages16
JournalGeotextiles and Geomembranes
Volume45
Issue number4
DOIs
Publication statusPublished - 1 Aug 2017

Fingerprint

discrete element method
Geotextiles
geotextile
Finite difference method
Soils
compression
soil
stiffness
Analytical models
dilation
Stiffness
Compaction
confining pressure
analysis
Stress concentration
Numerical analysis
friction
Friction
modeling
simulation

Keywords

  • Dilation rate
  • Discrete element method (DEM)
  • Geosynthetics
  • Geotextile-wrapped soil
  • Stress path
  • Uniaxial/triaxial compression test

Cite this

Cheng, Hongyang ; Yamamoto, Haruyuki ; Thoeni, Klaus ; Wu, Yang. / An analytical solution for geotextile-wrapped soil based on insights from DEM analysis. In: Geotextiles and Geomembranes. 2017 ; Vol. 45, No. 4. pp. 361-376.
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An analytical solution for geotextile-wrapped soil based on insights from DEM analysis. / Cheng, Hongyang ; Yamamoto, Haruyuki; Thoeni, Klaus; Wu, Yang.

In: Geotextiles and Geomembranes, Vol. 45, No. 4, 01.08.2017, p. 361-376.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - This paper presents a novel analytical solution for geotextile-wrapped soil based on a comprehensive numerical analysis conducted using the discrete element method (DEM). By examining the soil–geotextile interface friction, principal stress distribution, and stress–strain relations of the constituent soil and geotextile in the DEM analysis, a complete picture of the mechanical characterization of geotextile-wrapped soil under uniaxial compression is first provided. With these new insights, key assumptions are verified and developed for the proposed analytical solution. In the DEM analysis, a near-failure state line that predicts stress ratios relative to the maximums at failure with respect to deviatoric strain is uniquely identified; dilation rates are found to be related to stress ratios via a single linear correlation regardless of the tensile stiffness of the geotextile. From these new findings, the assumptions on the stress-state evolution and the stress–dilatancy relation are developed accordingly, and the wrapped granular soil can therefore be modeled as a Mohr–Coulomb elastoplastic solid with evolving stress ratio and dilation rate. The development of the proposed analytical model also demonstrates an innovative approach to take advantage of multiscale insights for the analytical modeling of complex geomaterials. The analytical model is validated with the DEM simulation results of geotextile-wrapped soil under uniaxial compression, considering a wide range of geotextile tensile stiffnesses. To further examine the predictive capacity of the analytical model, the stress–strain response under triaxial compression conditions is solved analytically, taking both different confining pressures and geotextile tensile stiffnesses into account. Good agreement is obtained between the analytical and DEM solutions, which suggests that the key assumptions developed in the uniaxial compression conditions also remain valid for triaxial compression conditions.

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