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Abstract: Within the context of “Radimero” TBM tunnels for "Terzo Valico dei Giovi" project, the high-speed rail between Genoa and Milan, geological formations containing Naturally Occurring Asbestos can be crossed. In these conditions, the limitation of dispersion of dust and, consequently, of fibres becomes very important for the TBM excavation process, especially during the transport of the excavated...