期刊
ENGINEERING FRACTURE MECHANICS
卷 205, 期 -, 页码 205-217出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2018.11.028
关键词
Flawed rock; Fracture mechanism; Strain localization; Acoustic emission; Digital image correlation
类别
资金
- Independent Innovation Project for Double First-level Construction (China University of Mining and Technology) [2018ZZCX04]
To investigate the strength and fracture mechanism of flawed rock, a series of uniaxial compression tests on sandstone specimens containing elliptical holes and fissures were carried out using acoustic emission (AE) monitoring and digital image correlation (DIC) system. Based on the experimental results, the stress-strain curve, mechanical parameters, AE counts and strain field evolution were analysed, and they indicated that the ligament angle is a significant factor influencing the strength and deformation of pre-flawed sandstone specimens. As the ligament angle increases, the peak strength, peak strain and elastic modulus first decrease and subsequently increase. Observations show that a stress fluctuation corresponds to an inflexion point in the accumulated AE count curve and AE counts reach the maximum value at or after peak strength. Additionally, the highlighted strain localization zones are indications of crack initiation, and crack propagation behaviour is a progressive evolution of the highlighted strain localization zones. Based on an analysis of the ultimate failure patterns, four types of rock bridge coalescence modes are identified, i.e., no coalescence, shear coalescence, double-shear coalescence and double-tensile coalescence.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据