Project and Rock Mass Specific Investigation for Tunnels

摘要

Deficiencies in site investigations for the construction of tunnels have been recognized. Investigations are typically performed to collect data for empirical models without considering individual rock mass characteristics and design stage specific requirements. We propose an investigation procedure initially based on simple key parameters specifically chosen for each rock type. As the design proceeds and investigations continue models are developed which are updated through all design stages to the construction. To optimize construction, especially in complex geological situations, support and excavation sequences are finalized during the tunnel excavation based on the results of face mapping and geotechnical monitoring. We demonstrate this procedure with case studies from Taiwan and Austria.