DEM Simulations of Critical State Behavior of Sand Under Triaxial Compression and Extension

Guobin Gong*, Minyi Zhu, Yuanfeng Bao, Stephen Wilkinson

*Corresponding author for this work

Research output: Chapter in Book or Report/Conference proceedingConference Proceedingpeer-review

Abstract

This study focuses on examining the behaviors of dense and loose sand subjected to drained triaxial compression and extension using DEM. The research involved performing drained tests on samples, manipulating them under both traditional (constant confining pressure) and constant mean stress conditions using servo-control. The observed drained behavior qualitatively aligns with previously published laboratory findings. It is demonstrated that the void ratio of sand samples remains unaffected by initial packing densities and applied stress paths (CT/CP). The critical state (CS) line is unique regardless of the stress path (CT/CP) conditions, though it shows dependence on whether triaxial compression or extension is applied. Drawing upon the DEM results, a comparison and discussion of various failure criteria are presented. The Matsuoka criterion emerges as the most suitable at the CS. To describe structural anisotropy, a generalized microscopic fabric parameter is proposed, which appears to be unique regardless of the stress paths (CT/CP) conditions.

Original languageEnglish
Title of host publicationEngineering Geology for a Habitable Earth
Subtitle of host publicationIAEG 14th Congress 2023 Proceedings - Engineering Geomechanics of Rock and Soil Masses
EditorsSijing Wang, Runqiu Huang, Rafig Azzam, Vassilis P. Marinos
PublisherSpringer Science and Business Media Deutschland GmbH
Pages131-142
Number of pages12
ISBN (Print)9789819990566
DOIs
Publication statusPublished - 2024
Event14th International Association for Engineering Geology and the Environment, IAEG 2023 - Chengdu, China
Duration: 21 Sept 202327 Sept 2023

Publication series

NameEnvironmental Science and Engineering
ISSN (Print)1863-5520
ISSN (Electronic)1863-5539

Conference

Conference14th International Association for Engineering Geology and the Environment, IAEG 2023
Country/TerritoryChina
CityChengdu
Period21/09/2327/09/23

Keywords

  • Critical state
  • DEM
  • Drained
  • Sand
  • Triaxial

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