Abstract
This paper describes i) the modelling of grouted rockbolts in a plane strain elasto-viscoplastic finite element analysis and ii) the use of the model to demonstrate the effect of rockbolting in restricting the growth of the zone of yielded rock in a circular tunnel problem. Practical aspects of rockbolting are outlined and the basis for numerical modelling of rockbolts described. A circular cross-section tunnel, 5m in radius, excavated in a pre- stressed rock mass of infinite extent is then condsidered. The use of no rockbolts, 11 long bolts, 11 short bolts and 6 long bolts in conditions of ideal plasticity and brittle plasticity are considered. The finite element analysis programme FESTA is used. The results are presented with diagrams. A significant reduction in deformation of the tunnel wall and size of the zone of yielded rock is demonstrated. An important conclusion is that the optimum length of rockbolt is one which places the tip of the bolt in intact unyielded rock.
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