ABSTRACT
The four 500m-deep Avrieux ventilation shafts represent one of the most important topics in the new Lyon-Turin railway underground works. The shafts connect the future ventilation unit with the Modane safety site at the foot of the Villarodin-Bourget-Modane adit, already excavated. Their function is to allow the ventilation during the underground works and line operation.
The Avieux shaft’s geometry is not widely used. Therefore, their excavation offers a good opportunity to study the in-situ rock properties through the interpretation of the pilot hole drilling parameters. This study aims to enrich the knowledge about the topic and stimulate a discussion within the international scientific community.
The pilot hole drilling parameters are analysed to obtain the relationships among their values and to correlate these outputs with the geomechanical values carried out during the design phase; a path that has also allowed to check the results, validate the approach and estimate the residual uncertainty.
