Discrete element modeling on the crack evolution behavior of brittle sandstone containing three fissures under uniaxial compression

Sheng-Qi Yang, Yan-Hua Huang, P. G. Ranjith, Yu-Yong Jiao, Jian Ji

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)

Abstract

Based on experimental results of brittle, intact sandstone under uniaxial compression, the micro-parameters were firstly confirmed by adopting particle flow code (PFC2D). Then, the validation of the simulated models were cross checked with the experimental results of brittle sandstone containing three parallel fissures under uniaxial compression. The simulated results agreed very well with the experimental results, including the peak strength, peak axial strain, and ultimate failure mode. Using the same microparameters, the numerical models containing a newgeometry of three fissures are constructed to investigate the fissure angle on the fracture mechanical behavior of brittle sandstone under uniaxial compression. The strength and deformation parameters of brittle sandstone containing new three fissures are dependent to the fissure angle.With the increase of the fissure angle, the elastic modulus, the crack damage threshold, and the peak strength of brittle sandstone containing three fissures firstly increase and secondly decrease. But the peak axial strain is nonlinearly related to the fissure angle. In the entire process of deformation, the crack initiation and propagation behavior of brittle sandstone containing three fissures under uniaxial compression are investigated with respect to the fissure angle. Six different crack coalescence modes are identified for brittle sandstone containing three fissures under uniaxial compression. The influence of the fissure angle on the length of crack propagation and crack coalescence stress is evaluated. These investigated conclusions are very important for ensuring the stability and safety of rock engineering with intermittent structures.
Original languageEnglish
Pages (from-to)871-889
Number of pages19
JournalActa Mechanica Sinica/Lixue Xuebao
Volume31
Issue number6
DOIs
Publication statusPublished - 2015

Keywords

  • Brittle sandstone
  • PFC2D
  • Three fissures
  • Crack initiation
  • Crack propagation
  • Crack coalescence

Cite this