Characterization of the Interactions between Cutting Tools and Rock during Tunneling from a Metallurgical and Rock Physical Point of View (C05)

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Subproject C5 aims at a fundamental understanding of the tool-ground interactions during tunneling in rock, cohesive soil and mixed-ground condition. Ground excavation in those materials, as char-acterized by crack initiation and crack propagation, as well as the tribological response of the tun-neling tools (surface spalling, fatigue, abrasion) will be investigated by experimental techniques with a high resolution. This results in determining the crack propagation in rock by acoustic measur-ing methods and characterizing the material’s microstructure by electron microscopy. Technical guidelines and optimized tool concepts will be derived from the experimental and analytical find-ings.