Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 43, Issue 10, Pages 2214-2231Publisher
WILEY
DOI: 10.1111/ffe.13245
Keywords
sandstone; pre-existing flaws; crack coalescence; high temperature; microobservation
Funding
- China Postdoctoral Science Foundation [2018M642360]
- Fundamental Research Funds for the Central Universities [2020ZDPYMS34]
- Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology [SKLGP2020K011]
- National Natural Science Foundation of China [51909260]
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The crack coalescence of rocks significantly affects the stability of rock engineering, and extensive studies have been performed on preflawed rock specimens without thermal treatment. However, the fracturing behaviour of preflawed specimens after thermal treatment has not been investigated comprehensively. In this study, three-flawed sandstone specimens with different flaw inclinations after high-temperature treatments were tested under uniaxial compression. Photographic, acoustic emission and digital image correlation techniques were used to investigate the crack initiation, propagation and coalescence behaviour. Experimental results show that the peak strength, elastic modulus and peak strain of the three-flawed specimens were lower than those of intact specimens and that they gradually recovered with increasing flaw angle. The peak strength and elastic modulus first increased and then decreased, whereas the peak strain increased with temperature. Noncoalescence, indirect coalescence and direct coalescence were three patterns observed between the two adjacent pre-existing flaws. Finally, the mechanism of high temperature in alteration of the mechanical properties of sandstone was revealed through microobservations.
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