Overview:
This webinar presents an extensive case study undertaken to mitigate the risk of damage to existing buildings and infrastructures due to critical and challenging TBM excavations for the Metro Cityringen in Copenhagen. The TBM tunnel alignment passes under historic buildings at shallow depths, which poses risks of ground subsidence.
Three-dimensional models were analysed for the stretch between Marmorkirken and Kongens Nytorv adjacent to masonry buildings dating back to the late 17th century. The numerical models also examined the intersection between the new tunnels and the existing metro lines set only 1.50 m beneath the new ones.
The presentation includes the site conditions, geological features, geotechnical/construction risks identified, outline of TBM, tunnelling sequence and numerical models developed.
The takeaways include how numerical models can clarify complex soil-structure interactions when a tunnel is bored in the vicinity of existing structures and assist in resolving technical problems happening at a tunnelling project in the forest of buildings.

Speaker:
Jaeseok Yang is a principal geotechnical engineer, and has over 20 years of research and consultancy experiences in the field of finite element analysis in geotechnical and civil engineering. He started working for MIDAS IT in 2004 as a product planner, and shifted his focus towards giving user support, lectures and workshops in 2005. Since 2011, he is now an international course coordinator, and lecturing courses on numerical analysis in geotechnical engineering in UK, Europe, Russia, USA, Middle East, Singapore and Malaysia.