On optimal reinforcement layout for underground openings

The problem of finding the optimal reinforcement layout for underground openings is considered. The rock material is assumed to sustain only compressive stresses while the reinforcements are in pure tension. It is shown that in this case, the optimal reinforcement layout can be achieved by solving a truss optimisation problem. The theory of truss optimisation is briefly presented. It is shown that the optimal layout of reinforcing bars is independent of the material properties of the reinforcing bars and the ground material.