Document Type

Conference Paper

Publication Date


Publication Details

Shima Entezam, Behshad Jodeiri Shokri, Hadi Nourizadeh, Peter Gregor, Alireza Entezam, Ali Mirzaghorbanali, Kevin McDougall, Waru Karunasena and Naj Aziz, Investigating the axial and shear performance of fiberglass rock bolts, Proceedings of the 2024 Resource Operators Conference, University of Wollongong - Mining Engineering, February 2024, 186-194.


This paper primarily evaluates the axial and shear performance of fully grouted fibreglass- reinforced polymer (FRP) rock bolting systems. For this purpose, a FRP rock bolt with a diameter of 20 mm was selected for examination. To evaluate the axial performance, several samples with a double- embedment length of 150 mm and an exposed length of 200 mm were cast using an 80 MPa cementitious grout and cured for 28 days. Pull-out tests were then conducted at a controlled rate of 1 mm/min with a 1000 KN MTS apparatus to determine the pull-out performance of the FRP bolts. Furthermore, a comparative analysis involved testing a 20 mm fully grouted steel rock bolt with a 150 mm encapsulation length, was conducted. The results indicated that the axial bearing capacity of the FRP bolts varied between 84 KN and 110 KN, while the steel bar exhibited a capacity of 144.5 KN. The load-displacement curves analysis showed that steel rebar rock bolts absorb more energy during the debonding process compared to the FRP bolts. Along with pull-out tests, the shear behaviour of the FRP bolts was also determined by conducting single and double-shearing tests. With this aim, after casting the concrete blocks in a double-shearing box, three different pretension values were applied to the samples. The results showed that pretension values had a direct impact on the displacement values, while they did not have a direct impact on the peak shear force values. Additionally, the tensile properties of the FRP and the steel bolts showed a different behaviour in the uniaxial tensile test.