# Performance Analysis of Tunnel Boring Machines for
## 4 Case Study: The Moncenisio Base Tunnel  
The forecast models identified were applied to the real case of Moncenisio base tunnel, a work included in the set of infrastructures that will be part of the new Turin-Lyon line. The main objective was to evaluate the performance of the open TBM \"GEA\" and the single shield TBM \"Federica\". The use of the models found in this study represents a preliminary approach to a very current, important topic on which there are few complete and exhaustive references.  
The Moncenisio base tunnel, 57.5 km long (45 km in France, 12.5 km in Italy), consists of two single-track tubes. It connects the international stations of Saint-Jean de Maurienne (France) and Susa (Italy), crossing the mountain range of the Alps. The work represents the fundamental part of the new Turin-Lyon railway connection, which is located at the intersection of the two major axes of communication between the North and the South and between the East and the West of Europe. It is a line for goods and passengers that extends for about 270 km, of which 70% is in France and 30% is in Italy. Tunnel Euralpin Lyon Turin (TELT) is the public promoter responsible for the construction and management of the cross-border section of the future freight and passenger line. The project also involves the construction of four exploratory and access tunnels (most of which have already been built), with the aim of investigating the characteristics of the geological formations. In total, three of these tunnels are located on the French side and are: Saint Martin La Porte, La Praz, and Modane, while the fourth is located on the Italian side in La Maddalena, Susa Valley.  
The geological context along the longitudinal profile of the tunnel can be summarized as follows: along the first stretch, from Saint Martin La Porte (pk 11 + 725) to La Praz (pk 20 + 133), the prevalent presence of sandstones, shales, and conglomerates is noticeable; along the second stretch, which develops from La Praz (pk 21 + 048) to Modane (pk 29 + 920), schists, sandstones, genesis, and quartz conglomerates with pink quartz and shales, limestones, dolomites, chalks and anhydrites are observed; the third stretch, from  
Figure 27: Trend of the thrust vs. the diameter based on data collected from the analysis of double shield TBMs. In red, the experimental model proposed in this study; in light blue main thrust, in dark blue auxiliary thrust representing the experimental model of [42]; and in green, the model proposed by [43].  
Figure 26: Trend of the torque vs. the diameter based on data collected from the analysis of double shield TBMs. In red, the experimental model proposed in this study; in blue, the model proposed by [42] and in green, the model proposed by [43].  
Modane (pk 33 + 341) to La Maddalena (pk 51 + 640), is the most heterogeneous from a geological point of view, as it is characterized by the presence of many formations: quartzites and quartzite conglomerates, limestones and dolomites, chalks and anhydrites, with intercalations of schist and dolomite, limestone, chalks and anhydrites, chlorite marbles, quartzites, quartzite mica schists, albitic greises passing through quartz mica schists, mica schists, and minutes greises with prevalence of glaucophane; the last stretch, from La Maddalena (pk 53 + 650) to Susa (pk 61 + 076), is characterized by mica schists and minute greises, albitic greises passing through quartz mica schists, quartzite, carbonicatic schists, prasnities and prasynitic schists.