ABSTRACT
A. Macau & S. Figueras Institut Geològic de Catalunya (IGC), Barcelona, Spain
J. Comellas Ferrocarrils de la Generalitat de Catalunya (FGC), Barcelona, Spain
ABSTRACT: Ground vibration in blasting works for shallow tunnels may induce some effects on unstable blocks on the surface of jointed rock mass. This fact can be critical in cases such as Vall de Núria rack railway, where tunneling works are the main measure for rock fall risk mitigation, especially when the service must remain fully operational and safe during the excavation phase. Newmark displacement theory can articulate a complete and useful method to take account of these effects during the design and tunneling process. Most relevant results obtained in both phases are presented and related considerations are discussed about data collection and processing, geological tracing observed or expected, ground effects and, in summary, the monitoring work capabilities for this kind of situations.
