Document Type

Conference Paper

Publication Date


Publication Details

Hao Zhai, Paul Hagan and Danqi LI, Sample Size and Sample Strength Effects on Testing the Performance of Cable Bolts, in Naj Aziz and Bob Kininmonth (eds.), Proceedings of the 16th Coal Operators' Conference, Mining Engineering, University of Wollongong, 10-12 February 2016, 40-52


This paper presents the results of a study on the effect of test sample diameter on the peak load carrying capacity of cable bolts in varying conditions. It was previously found that peak load varies with the diameter of test sample up to 300 mm and further that confinement has a significant impact on load. In this study test samples were varied over a larger range of diameters up to 500 mm in test samples having strengths of 32 MPa and 66 MPa using a plain strand Superstrand cable bolt and a nutcage high capacity MW9 cable bolt. The test work confirmed that there are differences in anchorage performance in material of different strength between the two cable bolts and importantly that a 300 mm diameter sample size is required when comparing different types of cable bolts design.