Mechanical performances and stress states of rock bolts under varying loading conditions

被引：64
作者：
Kang, H. [1 ]
Wu, Y.
Gao, F.
Jiang, P.
Cheng, P.
Meng, X.
Li, Z.
机构：
[1] China Coal Res Inst, Min & Designing Branch, Beijing, Peoples R China
来源：
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2016年 / 52卷
基金：
中国国家自然科学基金;
关键词：
Rock bolt; Rebar; Thread; Mechanical performances; Stress states; CAPACITY;
D O I：
10.1016/j.tust.2015.12.005
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
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.
引用
收藏
页码：138 / 146
页数：9
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