Reinforcement of underground excavations using the CT Bolt

This paper presents laboratory and in-situ pull test results on a new bolt system called the CT Bolt. The laboratory results were designed to determine the limiting strength of the ungrouted bolt components. Tests were carried out on the anchor, bolt and plate/hemispherical nut assembly. Tests were also carried out to determine the grouted strength behaviour. Split-pipe tests were set-up to determine load transfer data and to check the likely corrosion protection provided by the PVC tube around the CT Bolt. In-situ pull testing was carried out in different geological environments to determine the anchor, bolt and rock interactions for ungrouted and grouted cases.