Year

2019

Degree Name

Doctor of Philosophy

Department

School of Civil, Mining and Environmental Engineering

Abstract

The understanding of strata control and movement limitation in the reinforcement system of rock bolts and cable bolts generally was gained by connecting a stable zone to the material undergoing deformation and discontinues in past decades. The load transfer mechanism was proposed to evaluate the force in created and maintained by a supporting tendon when the strata start deforming. Strength properties of tendons forms the cornerstone of the safe application in different ground conditions through better understanding of the load transfer mechanisms and interactions between bolting system with different ground conditions.

Complex stress statements are applied on the cable bolt being combined tension with shear in most cases and the application of cable bolt for ground support has necessitated the need for increased knowledge in evaluating both tensile and shear strength of various types of cable bolts. Studies on the evaluation of the shear strength properties of cable bolts in shear and in tension have enabled a better characterisation of cable bolts and their installation in different ground conditions. The pull testing method particularly during early days of the tendon performance was evaluated and the pull testing techniques recently focused on the evaluation of cable bolts and their unwinding characteristics. Furthermore, the measurement and observation indicate that the failure of cable bolt or its de-bonding happened in field mostly caused by shearing not tension. The importance of evaluating tendon in shear has been addressed and various types, including single shear and double shear, of testing apparatus reviewed. Various parameters affecting load transfer capacity of tendon in general and cable bolts in particular have been examined under both tension and shear conditions and the properties of grout material whose performance that forms one of the crucial factors affecting tendon installation effectiveness, was also experimented...

This thesis is unavailable until Wednesday, April 01, 2020

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Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.