Testing Study on Crack Propagation Due to Rheological Fracture in Quasi-Brittle Material Under Compression-Shear or Double Torsional Loading

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• 作者：Yanlin Zhao ; Yixian Wang ; Weijun Wang ; Wen Wan…
• 关键词：Rock mechanics ; Stress intensity factor ; Creep fracture ; Wing crack ; Fracture mechanism
• 刊名：Geotechnical and Geological Engineering
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：34
• 期：5
• 页码：1655-1667
• 全文大小：1,478 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Hydrogeology
  Terrestrial Pollution
  Waste Management and Waste Technology
  Civil Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-1529
• 卷排序：34

文摘

In this paper, the crack propagation measurement for rock is made by using constant displacement relax method of double torsion specimens, it has confirmed the presence of creep fracture on a laboratory-scale, and has obtained the three kinds of creep fracture coalescence patterns: wing crack, primary crack and shear crack. The creep fracture is a stable crack growth essential due to the subcritical propagation of rock-like material crack. Based on viscoelastic fracture mechanics, rheological mechanics and energy principle, the corresponding potential functions have been deduced from inner variable, which included the stress intensity factors, wing crack length and duration time, and the creep fracture criterion, computational model of damage variable effects have been established. The calculation method and theoretical criterion have provided a new and practical tool for studying microscopic mechanism of creep fracture in rock cracks propagation measurement and macro-mechanism of creep fracture in rock engineering.