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Shock and Vibration
Volume 2015 (2015), Article ID 121673, 8 pages
http://dx.doi.org/10.1155/2015/121673
Research Article

Bolt Pull-Out Tests of Anchorage Body under Different Loading Rates

1State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
2State Key Laboratory of Safe and Effective Coal Mining, Anhui University of Science and Technology, Huainan 232001, China
3School of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Received 13 November 2014; Accepted 9 January 2015

Academic Editor: Shimin Liu

Copyright © 2015 Tong-bin Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the force analysis and mechanical transmission mechanism of grouting bolts, the self-developed test apparatus for interfacial mechanics is used to study the distribution rule of axial force and interfacial stress of bolts in anchorage body. At the same time, pull-out tests of anchorage body are simulated with the particle flow code software , and stress distribution and failure patters are researched under different loading rates. The results show that the distribution of axial force and interfacial shear stress is nonuniform along the anchorage section: axial force decreases, shear force increases first and then decreases, and the maximum value of both of them is closed to the pull-out side; with the increase of loading rates, both of axial force and interfacial shear stress show a trend of increase in the upper anchorage section but changes are not obvious in the lower anchorage section, which causes serious stress concentration; failure strength of pull-out and loading rates show a linear correlation; according to loading rates’ impact on the anchoring effect, the loading rates’ scope can be divided into soft scope ( mm/s), moderate scope (10 mm/s < < 100 mm/s), and strong scope ( mm/s).