A study of crack propagation during blasting under high in-situ stress conditions based on an improved CDEM method

Considering the energy consumption of the crushed zone caused by blasting, the energy dissipation characteristics were investigated through theoretical calculation and a plug-in for calculation of energy reduction was made. As a result, an improved CDEM method suitable for studying blast-induced cra...

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Bibliographic Details
Published in:Mechanics of advanced materials and structures 2024-10, Vol.31 (20), p.4922-4939
Main Authors: Ding, Chenxi, Liang, Xintong, Yang, Renshu, Zhang, Zong-Xian, Guo, Xiao, Feng, Chun, Zhu, Xinguang, Xie, Quanmin
Format: Article
Language:English
Subjects:
Axial stress
Blasting
Crack propagation
Cracks
Crushed zone
Energy consumption
Energy dissipation
Gaging
Horizontal orientation
in-situ stress
Propagation
stress evolution
Stress propagation
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Summary:Considering the energy consumption of the crushed zone caused by blasting, the energy dissipation characteristics were investigated through theoretical calculation and a plug-in for calculation of energy reduction was made. As a result, an improved CDEM method suitable for studying blast-induced crack propagation was proposed. The improved CDEM method was then used to numerically simulate the blast-induced crack propagation under three different in-situ stress conditions: uniaxial in-situ stress, biaxial equal in-situ stresses and biaxial unequal in-situ stresses. It was found that the in-situ stress conditions had significant effects on the distribution of the blast-induced cracks, the evolution of blast-induced stresses and the propagation of the blast-induced cracks. At the uniaxial in-situ stress condition, the vertical in-situ stress reduced the tip stresses of the horizontal crack and inhibited the propagation of the horizontal crack. At the biaxial equal in-situ stress condition, the peak radial stresses and circumferential stresses of the gauging points decreased gradually with the increase of in-situ stresses. In particular, the circumferential stresses of the gauging points gradually changed from tension to compression with an increasing in-situ stress. At the biaxial unequal in-situ stress condition, there were different inhibitions on crack propagation in the horizontal direction and the vertical one.
ISSN:1537-6494
1537-6532
DOI:10.1080/15376494.2023.2208112