期刊
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
卷 51, 期 -, 页码 346-353出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2015.10.007
关键词
Reinforcement; Rock bolt; Rock mass; Cross-flaws
资金
- National Natural Science Foundation of China [51379114, 51279095]
- Natural Science Foundation of Shandong Province, China [ZR2012EEQ007]
- State Key Laboratory Open Fund of Geomechanics and Geotechnical Engineering [Z013004]
Rock bolting is one of the most effective and economical means of rock mass reinforcement. Existing studies of rock bolt reinforcement are mostly focused on rock masses without flaw, with a single flaw, or with parallel flaws. However in rock masses, cracks or flaws usually exist in the form of cross-flaws. In order to understand the impact of cross-flaws on rock bolt reinforcement and to further explore the differences of bolt reinforcement between rock mass with cross-flaws and rock mass with a single flaw, reinforced analog specimens with cross-flaws and with a single flaw were tested under uniaxial compressive condition. The experimental results show that the uniaxial compressive strength of the reinforced rock mass with cross-flaws in this research is higher than that of reinforced rock mass with a single flaw. This observation can be explained by the difference in the failure modes of reinforced specimens: the reinforced rock masses with a single flaw fail due to the formation of a shear crack while reinforced rock masses with cross-flaws fail as a result of a tensile fracture or interaction between tensile fracture and shear fracture. (C) 2015 Elsevier Ltd. All rights reserved.
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