Document Type

Conference Paper

Publication Date


Publication Details

Behshad Jodeiri Shokri, Shima Entezam, Hadi Nourizadeh, Amin Motallebiyan, Ali Mirzaghorbanali, Kevin McDougall, Naj Aziz and Karu Karunasena, The effect of changing confinement diameter on axial load transfer mechanisms of fully grouted rock bolts, Proceedings of the 2023 Resource Operators Conference, University of Wollongong - Mining Engineering, February 2023, 290-295.


This paper aims to study the effect of changing the confinement diameter on the axial load-bearing capacity of rock bolt systems. The diameter of the confinement is monitored in a fully encapsulated rock bolt at day 7 and 28 of grout curing. These particular times were considered critical to demonstrate grout strength when conducting pull-out tests on rock bolt samples. Following this, the samples were cast with a water-grout ratio of 36%, the internal diameters of encapsulation being 23 mm and 50 mm, and the encapsulation length at 50 mm. The results indicated that by increasing the confinement diameter, the rock bolt's load-bearing capacity increased approximately 32% and 45% for days 7 and 28, respectively.