The microscopic mechanism associated with mechanical behaviour of sandstone: Using a bonded particle model

Meng-Chia Weng*, H. H. Li

*Corresponding author for this work

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

Abstract

According to the previous researches of sandstone, it was found that the key microscopic parameters influencing unconfined compressive strength (UCS) are porosity and grain area ratio (GAR). However, the relation of macroscopic properties with the microscopic ones highlights necessities further study in exploring how the microscopic properties influence the macroscopic properties. In this study, numerical analyses based on the bonded particle model were conducted to systematically study the microscopic mechanism. The model is firstly verified by simulating the variation of UCS with different GAR and porosity n. Furthermore, the elasto-plastic deformation of sandstone is explored by means of CTC tests. Analysis results demonstrate the mechanical behaviour of sandstone has the following characteristics: (1) The greater GAR and porosity will lead to the less cohesion, and the higher porosity leads to the lower friction angle; (2) The elastic shear modulus increases with decreasing porosity and increasing GAR; (3) A series of elliptic plastic potential surfaces can be observed; and (4) The variations of plastic angle and plastic strain trajectory under different shear stress are similar to actual behaviours of sandstone.

Original languageEnglish
Title of host publicationProceedings of the 12th International Conference on Civil, Structural and Environmental Engineering Computing
DOIs
StatePublished - 1 Dec 2009
Event12th International Conference on Civil, Structural and Environmental Engineering Computing, CC 2009 - Funchal, Madeira, Portugal
Duration: 1 Sep 20094 Sep 2009

Publication series

NameProceedings of the 12th International Conference on Civil, Structural and Environmental Engineering Computing

Conference

Conference12th International Conference on Civil, Structural and Environmental Engineering Computing, CC 2009
CountryPortugal
CityFunchal, Madeira
Period1/09/094/09/09

Keywords

  • Bonded particle model
  • Elasto-plastic deformation
  • Sandstone

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