Journal
JOURNAL OF GEOPHYSICS AND ENGINEERING
Volume 15, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1742-2140/aac85e
Keywords
macroscopic/mesoscopic observation; AE; different normal stress
Categories
Funding
- General Project of the National Natural Science Foundation of China [51474040, 51434003]
Ask authors/readers for more resources
Rock fracture mechanics have been widely applied to earthquake mechanics, hot dry rock geothermal energy extraction, hydraulic fracturing, mechanical fragmentation, rock slope analysis, geophysics, and many other practical problems. It is important for geological disaster identification and prevention to clarify the crack propagation mechanism in rock failure process. To further investigate the evolution of crack propagation and internal damage in brittle rock, and based on the way that rock mainly occurs shear failure, we conducted direct shear tests on sandstone. Our tests combined macroscopic/mesoscopic observation and acoustic emissions monitoring. We found that crack propagation under compressive-shear stress occurs in stages, including the initiation and propagation of tension cracks, which are then connected by shear cracks. As normal stress increases, the length of a single tension crack becomes shorter, and the cracks themselves increase in number. We found that tension crack propagation is accompanied by fewer microcracks; in contrast, shear crack propagation is accompanied by considerable microcracks. This process may induce a drop off in mineral particles through slipping, and it may ultimately produce a rock bridge. The main damage occurs after shear cracks appear during shear failure, especially when the normal stress increases.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available