Abstract
One way to obtain an advanced rock reinforcement is to use reinforced shotcrete which interacts statically with rock bolts. This investigation was carried out in order to obtain a better knowledge of the effects of steel fibres in shotcrete and also of how to design the bolt anchor which is important for the static interaction between the shotcrete and the rock bolt. 22 large scale tests on bolt anchored reinforced shotcrete layers were performed. 19 of the layers were reinforced with Bekaert steel fibres, two were reinforced with cold tensioned reinforcement mesh and one with an annealed mesh. The parameters varied were the amount of fibres, the fibre length and the design of the bolt anchor in the shotcrete. For each large scale test adhesion tests on the rock-shotcrete interface were performed as well as strength tests on sawn out shotcrete cubes and beams both with and without fibres. The concrete mass was tested using cast cubes. Four large scale tests on extremely thin fibre reinforced linings without bolt anchorage were performed. Two specimens contained steel fibres and two glass fibres. Small scale shear tests on cracked steel fibre reinforced specimens were performed. Six tests were successful and these are reported. (Author/TRRL)
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