Comptes Rendus
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Cracking behavior and local stress characteristics around the opening surrounded by two intermittent joints: experiment and numerical simulation
Comptes Rendus. Mécanique, Volume 348 (2020) no. 1, pp. 33-61.

In this research, the Strength and deformation behaviors, cracking process, and local stress evolution of sandstone specimens containing a circular opening and two joints (called H-J sandstone specimens in this study) were researched by experiment and numerical simulation (two-dimension particle flow code). The effect of different joint positions around the opening has been specifically studied by changing the ligament angle (β). The test results show that peak strength and peak strain firstly decrease then increase with the increasing β, while the peak strain presents an overall upward trend. Three types of coalescence failure patterns between the opening and joints formed, and the corresponding cracking process and acoustic emission (AE) characteristics are highly related to the ligament angle. Based on the micro-parameters calibration, a good agreement was achieved between experimental and numerical simulation. The numerical results show that the local stress evolution around the opening is highly corresponding to the cracking process. The microcracks initiation and propagation cause obvious stress fluctuations, drops or increasements of minimum principal stress, while the cracks coalescence results in obvious reduction of maximum principal stress and drops of stress-strain curve. It also be found that the stress distribution and magnitude around the opening tend to be closely related to both coalescence failure and strength characteristics of H-J specimens. Finally, the cracking mechanism between the opening and joints was revealed based on particle displacement fields. The results show that different cracking mechanism may cause different local stress changes, which finally determines the overall mechanical behavior of specimens.

Received:
Revised:
Accepted:
Published online:
DOI: 10.5802/crmeca.4
Keywords: Sandstone, Opening, Joints, Cracking, Stress evolution, Particle flow code

Yuan-Chao Zhang 1; Yu-Jing Jiang 1; Xiao-Jie Tang 2; Miao Chen 3, 4; Xin-Shuai Shi 4

1 Graduate School of Engineering, Nagasaki University, Nagasaki 8528521, Japan
2 Department of Civil Engineering, The University of Hong kong, Hong kong, PR China
3 College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China
4 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, PR China
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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     title = {Cracking behavior and local stress characteristics around the opening surrounded by two intermittent joints: experiment and numerical simulation},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {33--61},
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Yuan-Chao Zhang; Yu-Jing Jiang; Xiao-Jie Tang; Miao Chen; Xin-Shuai Shi. Cracking behavior and local stress characteristics around the opening surrounded by two intermittent joints: experiment and numerical simulation. Comptes Rendus. Mécanique, Volume 348 (2020) no. 1, pp. 33-61. doi : 10.5802/crmeca.4. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.4/

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