Investigating shear behaviour of fibreglass rock bolts reinforcing infilled discontinuities for various pretension loads
Article
Article Title | Investigating shear behaviour of fibreglass rock bolts reinforcing infilled discontinuities for various pretension loads |
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ERA Journal ID | 4162 |
Article Category | Article |
Authors | Gregor, Peter, Mirzaghorbanali, Ali, McDougall, Kevin, Aziz, Naj and Jodeiri Shokri, Behshad |
Journal Title | Canadian Geotechnical Journal |
Journal Citation | 61 (3) |
Number of Pages | 33 |
Year | 2024 |
Publisher | Canadian Science Publishing |
Place of Publication | Canada |
ISSN | 0008-3674 |
1208-6010 | |
Digital Object Identifier (DOI) | https://doi.org/10.1139/cgj-2022-0619 |
Web Address (URL) | https://cdnsciencepub.com/doi/abs/10.1139/cgj-2022-0619 |
Abstract | In this paper, eight shear tests were carried out utilising a double shear with infilled shear interfaces after determining an appropriate experimental design and modified testing scheme. For this, two rock bolts, 20-tonne and 30-tonne, were tested with modified double shear testing apparatus at different pretension loads. The infilled test scheme was conducted with 5mm thick sandy clay infilled shear interfaces. A 40MPa small aggregate concrete was used for all samples to simulate the host rock. Based on the shear profiles, it was found that all samples followed a three-part failure profile consisting of elastic, strain softening and failure regions. The results of double shear tests revealed that the 20-tonne rock bolt saw a significant overall decrease of approximately 30% in its failure displacement response as opposed to the 30-tonne samples’ which saw a 6% increase. Also, it was concluded that the 30-tonne samples outperformed the 20-tonne rock bolts by up to 30%, irrespective of initial pretension settings. Comparing the physical failure characteristics of the samples found that both the 20-tonne and 30-tonne samples exhibited the same response to increased pretension. As the pretension increased, the angle experienced at the hinge point also increased incrementally. |
Keywords | Fibre glass rock bolts, joints, clean and infilled joints |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
401902. Geomechanics and resources geotechnical engineering | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Southern Queensland |
School of Engineering | |
School of Surveying and Built Environment | |
University of Wollongong |
https://research.usq.edu.au/item/yz0qx/investigating-shear-behaviour-of-fibreglass-rock-bolts-reinforcing-infilled-discontinuities-for-various-pretension-loads
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