期刊
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
卷 52, 期 -, 页码 138-146出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2015.12.005
关键词
Rock bolt; Rebar; Thread; Mechanical performances; Stress states
资金
- National Natural Science Foundation of China [U1261211]
- National Key Technology Support Program of China [2012BAK04B06]
A comprehensive study including laboratory tests and numerical modeling was performed to investigate factors of rock bolt fracture. Experimental tests were performed to evaluate the mechanical performances of bolt ends including the thread and adjacent. The effects of installation angle, pretension and accessories (plate, washer and nut) were evaluated. It is found that a bolt installed with an oblique angle to roadway surface suffers a complex stress combination of tensioning, bending and twisting on the bolt. This complex stress is much greater than the tensile stress, leading to cracking and growth at the location of bending causing the thread to fail even though the tensile stress is less than the yield strength. Bolt thread is more vulnerable to fracture than rebar. (C) 2015 Elsevier Ltd. All rights reserved.
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