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  Key machine parameters for classification of rock mass in TBM excavation in BBT

  The Exploratory Tunnel of BBT is excavated ahead of the two equal main tunnels and with a smaller diameter as compared to them, in order to investigate the conditions of the rock mass and its response to the excavation, thus allowing the execution of construction works with a reasonable optimization of risks. The study analyses the section located before the construction stoppage that took place for geological reasons in one of the main tunnels, carrying out a statistical analysis of the key parameters of the three different TBMs, by comparing operating ranges among them. Finally, the rock mass behaviour is determined by correlating it with the corresponding intervals of the machine parameters.

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