Effects of flaw width on cracking behavior of single-flawed rock specimens
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ORIGINAL PAPER
Effects of flaw width on cracking behavior of single-flawed rock specimens Jiayi Shen 1,2 & Shaoxiang Zhan 1 & Murat Karakus 3 & Jianping Zuo 4,5 Received: 31 October 2019 / Accepted: 28 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Cracking behavior of flawed samples has been extensively studied in rocks and rock-like materials using experimental and numerical approaches. However, the existing research mainly focuses on the effects of flaw length l and inclination angle α on rock mechanical behavior, a limited attention has been given to understand the role of flaw width b on crack initiation and propagation in relation to mechanical parameters of rocks. In this paper, a two-dimensional particle flow code (PFC2D)-based synthetic rock model, which is calibrated by the laboratory sandstone properties, is used to investigate the effects of flaw width on cracking behavior of single-flawed rock samples under uniaxial compression tests. Numerical simulation results show that the flaw width b has significant effects on the crack geometrical parameters (crack initiation location d and crack initiation angle θ). The values of θ and d significantly decrease with the increase of flaw width when b < 1.0 mm and their values tend to be stable with the further increase of flaw widths. It is also found that the mechanical properties (uniaxial compressive strength UCS and deformation modulus Es) of flawed rock samples are related to the crack geometrical parameters (θ and d) and the effects of flaw width on the values of UCS and Es of single-flawed rock specimens is significant when b < 1.0 mm for lower crack inclination angle (α < 60°). Keywords Numerical simulation . PFC . Flaw width . Cracking behavior . Single-flawed rock . Mechanical properties
Introduction The deformation and strength of rock masses are controlled partially by the intact rock and the characteristics of discontinuities particularly their mechanical and geometrical properties, fracture persistency, roughness,
* Jianping Zuo [email protected] 1
Institute of Port, Coastal and Offshore Engineering, Zhejiang University, Hangzhou 310015, China
2
State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
3
School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
4
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China
5
Institute of Rock Mechanics and Fractals, School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
aperture, etc. In addition, the behavior of rock mass depends not only on the existing fractures but also on how new fractures initiate and propagate under various in situ stress conditions (Park and Bobet 2009; Wong 2008; Jin et al. 2017; Liu et al. 2018; Pan et al. 2018; Tang et al. 2019). Therefore, it is critical to understand how existing f
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