Unveiling Axial Load Transfer Mechanism in Fully Encapsulated Rock Bolts
Article
| Article Title | Unveiling Axial Load Transfer Mechanism in Fully Encapsulated Rock Bolts |
|---|---|
| ERA Journal ID | 4070 |
| Article Category | Article |
| Authors | Nourizadeh, Hadi, Mirzaghorbanali, Ali, McDougall, Kevin, Mitri, Hani, Craig, Peter, Rastegarmanesh, Ashakan and Aziz, Naj |
| Journal Title | Rock Mechanics and Rock Engineering |
| Journal Citation | 58 (3), pp. 4043-4067 |
| Number of Pages | 25 |
| Year | 2025 |
| Publisher | Springer |
| Place of Publication | Springer |
| ISSN | 0723-2632 |
| 1434-453X | |
| Digital Object Identifier (DOI) | https://doi.org/10.1007/s00603-024-04347-x |
| Web Address (URL) | https://link.springer.com/article/10.1007/s00603-024-04347-x |
| Abstract | Determining the axial load transfer mechanism of rock bolts under various conditions is paramount for ensuring efficient reinforcement in rock structures, advancing our understanding of rock support and ability to design robust engineering solutions. This paper presents the results of an experimental study aimed at investigating the factors affecting axial load transfer mechanisms in fully encapsulated rock bolts including embedment length, mechanical characteristics of bonding materials, and host rock conditions. The results show that increasing the embedment length improves the pullout capacity, but only up to a critical length, beyond which the ultimate strength and bond stress distribution remain constant. Amongst the mechanical characteristics, shear modulus of the bonding materials was found the most significant factor influencing axial load transfer and the bond stress distribution. Compressive strength of bonding materials, which is commonly used to assess performance, should not be the only factor considered, as shear properties were found more representative. The expansion characteristics of the bonding agents were also found to be effective in improving pullout performance. The study also provides a detailed explanation of how the mechanical properties of host rocks affect the pullout capacity of bolts. Specifically, it states that greater stiffness result in higher pullout strength. |
| Keywords | Pullout tests; Rock bolts; Bonding materials; Anchoring grouts and resins; Bond stress distribution |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 401902. Geomechanics and resources geotechnical engineering |
| Byline Affiliations | Centre for Future Materials |
| School of Engineering | |
| School of Surveying and Built Environment | |
| McGill University, Canada | |
| Jennmar Australia, New South Wales | |
| University of Wollongong |
https://research.usq.edu.au/item/zwv2y/unveiling-axial-load-transfer-mechanism-in-fully-encapsulated-rock-bolts
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