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

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• 作者：Sheng-Qi Yang ; Yan-Hua Huang ; P. G. Ranjith ; Yu-Yong Jiao ; Jian Ji
• 关键词：Brittle sandstone ; $$\hbox {PFC}^{\mathrm{2D}}$$ PFC 2 D ; Three fissures ; Crack initiation ; Crack propagation ; Crack coalescence
• 刊名：Acta Mechanica Solida Sinica
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：31
• 期：6
• 页码：871-889
• 全文大小：11,480 KB
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• 作者单位：Sheng-Qi Yang (1) (2)
  Yan-Hua Huang (1)
  P. G. Ranjith (2)
  Yu-Yong Jiao (3)
  Jian Ji (2)
  
  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China
  2. Deep Earth Energy Research Laboratory, Department of Civil Engineering, Monash University, Melbourne, VIC, 3800, Australia
  3. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China
  
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics
  Mechanics, Fluids and Thermodynamics
  Engineering Fluid Dynamics
  Numerical and Computational Methods in Engineering
  Chinese Library of Science
  
• 出版者：The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of
• ISSN：1614-3116

文摘

Based on experimental results of brittle, intact sandstone under uniaxial compression, the micro-parameters were firstly confirmed by adopting particle flow code \((\hbox {PFC}^{\mathrm{2D}})\). 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 micro-parameters, the numerical models containing a new geometry 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. Keywords Brittle sandstone \(\hbox {PFC}^{\mathrm{2D}}\) Three fissures Crack initiation Crack propagation Crack coalescence