Progressive Fracture Behavior and Acoustic Emission Release of CJBs Affected by Joint Distance Ratio

Yongyi Wang, Bin Gong (), Yongjun Zhang, Xiaoyu Yang and Chun’an Tang
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Yongyi Wang: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
Bin Gong: College of Engineering, Design and Physical Sciences, Brunel University London, London UB8 3PH, UK
Yongjun Zhang: School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China
Xiaoyu Yang: School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Chun’an Tang: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Mathematics, 2022, vol. 10, issue 21, 1-30

Abstract: The progressive collapse behavior and energy release of columnar jointed basalts (CJBs) can be greatly influenced by different joint distance ratios. By adopting the digital image correlation, a series of heterogeneous CJB models are established. The continuous fracture process and acoustic emissions (AEs) are captured numerically under varying lateral pressures. The load curves under different joint distance ratios and model boundaries are analyzed. Meanwhile, the strength, deformation modulus and AE rule are discussed. The data indicate that under plane strain, the troughs of compression strength appear at the column dip angle β = 30°, 150°, 210° or 330°; the equivalent deformation modulus changes in an elliptical way with β increasing; the compression strength and equivalent deformation modulus are higher than the case between plane stress and plane strain under different joint distance ratios. When β = 30°, the accumulation of AE energy corresponding to the stress peak under plane strain are higher than the case between plane stress and plane strain but becomes lower when β increases to 60°, which implies the critical transformation of the AE energy-related failure precursor affected by column dip angle. These achievements will contribute to the design, construction and support of slopes and tunnels encountering CJBs.

Keywords: columnar jointed basalt; failure mechanism; acoustic emission; joint distance ratio; numerical simulation (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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