Experimental Study of Bolt-Anchoring Mechanism for Bedded Rock Mass
Publication: International Journal of Geomechanics
Volume 20, Issue 4
Abstract
This study examined the effectiveness of different bolt anchoring systems in bedded rock to determine the bolt anchoring mechanism. The rock failure under shear and tensile stresses was evaluated. The results showed that bolt anchoring was achieved mainly by an anchoring agent restoring the bond of the rock surrounding the drill holes and the bolt body providing supporting resistance. The strength of the bedded rock increased with the anchoring effect. Full anchoring bolts were especially effective. In the absence of bolts, the failure mode of the rock changed from shear failure to splitting failure. With bolting, the failure plane was parallel to the bolt’s axis. Shearing began along the interface between the hard and soft rock beds. Compared with end-bolt anchoring, full-length bolt anchoring offered a superior anchoring effect by increasing the strength and shear-bearing capacity of the rock so that it could bear more load.
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Acknowledgments
This research was supported by the Applied Basic Research Foundation of Yunnan Province (2018FB098).
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Published In
International Journal of Geomechanics
Volume 20 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jan 5, 2019
Accepted: Jun 14, 2019
Published online: Jan 27, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 27, 2020
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