An experimental and numerical study on cracking behavior of brittle sandstone containing two non-coplanar fissures under uniaxial compression

Sheng Qi Yang, Wen Ling Tian, Yan-Hua Huang, P. G. Ranjith, Yang Ju

Research output: Contribution to journalArticleResearchpeer-review

45 Citations (Scopus)

Abstract

To understand the fracture mechanism in all kinds of rock engineering, it is important to investigate the fracture evolution behavior of pre-fissured rock. In this research, we conducted uniaxial compression experiments to evaluate the influence of ligament angle on the strength, deformability, and fracture coalescence behavior of rectangular prismatic specimens (80 9 160 9 30 mm) of brittle sandstone containing two non-coplanar fissures. The experimental results show that the peak strength of sandstone containing two non-coplanar fissures depends on the ligament angle, but the elastic modulus is not closely related to the ligament angle. With the increase of ligament angle, the peak strength decreased at a ligament angle of 60˚, before increasing up to our maximum ligament angle of 120˚. Crack initiation, propagation, and coalescence were all observed and characterized from the inner and outer tips of pre-existing non-coplanar fissures using photographic monitoring. Based on the results, the sequence of crack evolution in sandstone containing two non-coplanar fissures was analyzed in detail. In order to fully understand the crack evolution mechanism of brittle sandstone, numerical simulations using PFC2D were performed for specimens containing two non-coplanar fissures under uniaxial compression. The results are in good agreement with the experimental results. By analyzing the stress field, the crack evolution mechanism in brittle sandstone containing two non-coplanar fissures under uniaxial compression is revealed. These experimental and numerical results are expected to improve the understanding of the unstable fracture mechanism of fissured rock engineering structures.

Original languageEnglish
Article number027
Pages (from-to)1497-1515
Number of pages19
JournalRock Mechanics and Rock Engineering
Volume49
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • Brittle sandstone
  • Crack coalescence
  • Crack initiation
  • Tensile crack
  • Two non-coplanar fissures

Cite this

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title = "An experimental and numerical study on cracking behavior of brittle sandstone containing two non-coplanar fissures under uniaxial compression",
abstract = "To understand the fracture mechanism in all kinds of rock engineering, it is important to investigate the fracture evolution behavior of pre-fissured rock. In this research, we conducted uniaxial compression experiments to evaluate the influence of ligament angle on the strength, deformability, and fracture coalescence behavior of rectangular prismatic specimens (80 9 160 9 30 mm) of brittle sandstone containing two non-coplanar fissures. The experimental results show that the peak strength of sandstone containing two non-coplanar fissures depends on the ligament angle, but the elastic modulus is not closely related to the ligament angle. With the increase of ligament angle, the peak strength decreased at a ligament angle of 60˚, before increasing up to our maximum ligament angle of 120˚. Crack initiation, propagation, and coalescence were all observed and characterized from the inner and outer tips of pre-existing non-coplanar fissures using photographic monitoring. Based on the results, the sequence of crack evolution in sandstone containing two non-coplanar fissures was analyzed in detail. In order to fully understand the crack evolution mechanism of brittle sandstone, numerical simulations using PFC2D were performed for specimens containing two non-coplanar fissures under uniaxial compression. The results are in good agreement with the experimental results. By analyzing the stress field, the crack evolution mechanism in brittle sandstone containing two non-coplanar fissures under uniaxial compression is revealed. These experimental and numerical results are expected to improve the understanding of the unstable fracture mechanism of fissured rock engineering structures.",
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An experimental and numerical study on cracking behavior of brittle sandstone containing two non-coplanar fissures under uniaxial compression. / Yang, Sheng Qi; Tian, Wen Ling; Huang, Yan-Hua; Ranjith, P. G.; Ju, Yang.

In: Rock Mechanics and Rock Engineering, Vol. 49, No. 4, 027, 01.04.2016, p. 1497-1515.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Ju, Yang

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