ABSTRACT
More and more tunnels are excavated using tunnel boring machines (TBM). The possibilities to use the informations available during the excavation of a tunnel in order to determine the required support or evaluate a rock mass class (RMC) are discussed in the paper. Two different examples are used to show the power of a fuzzy based evaluation system. The same procedure can be used to control the tunnel boring machine during the excavation. The advantages and disadvantages of the suggested system are discussed.
