This instalment of the Lunchtime lecture seriesfocused on 'Practical Aspects of Segmental Tunnel Lining Design'  in collaboration with ITA-AITES. 

After several decades of continuous progress, mechanized tunnelling has now become the main method applied in almost all types of geology, all sizes, and in increasingly shorter lengths. The predominant excavation support system for TBM tunnels consists of a one-pass precast concrete segmental liner which in addition to typical use in soft ground contexts is also increasingly applied in competent rock settings to better manage the geotechnical and hydrogeological risks. The first presentation of this lecture covers necessary details for analysis and design and provides in-depth information allowing tunnel engineers to start designing tunnel segmental linings. The required elements of concrete technology are presented in the second presentation and the last presentation describes the use of fiber for reinforcing segmental linings which has become the preferred solution for most cases.

The episode featured three lectures and finished with a Q&A with all speakers. 

• Basic Principles of Tunnel Segmental Liner Analysis and Design - Verya Nasri
• Technology challenges to meet sustainability goals of concrete used for tunnel segmental linings - Barzin Mobasher 
• Use of Fiber for Tunnel Segment reinforcement - Benoit De Rivaz

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