WORKSHOP REPORT | BTSYM
BTSYM: WORKSHOP VIEW Participating in the workshop organised by Bekaert and the
British Tunnelling Society Young Members (BTSYM) on 20 March 2025 was a truly enlightening experience. As a young engineer keen on tunnelling innovations, I
found the event to be highly informative. The morning sessions delved into the properties
and benefits of steel fibre reinforced concrete (SFRC), including its tensile strength and crack control capabilities. The discussions on testing methods and the shift from temporary to permanent sprayed concrete linings were particularly insightful. We explored what can be achieved with SFRC in various tunnelling applications, such as SCL excavations, and discussed the importance of crack control and durability. We also learned about potential pitfalls to watch out for, such as ensuring proper mix design and quality control to avoid issues like inadequate bonding. The afternoon’s practical session stood out as the highlight. Using Bekaert’s software to design segmental linings and hybrid designs for cut-and-cover tunnel slabs/walls was both engaging and fun. The interactive discussions and questions from fellow attendees enriched the learning experience.
The workshop highlighted how the applications of
SFRC can differ significantly depending on the project requirements. For instance, the design considerations for segmental linings in deep tunnels can vary greatly from those for cut-and-cover tunnels, where factors like load distribution and environmental conditions play a crucial role. This nuanced understanding of SFRC’s versatility and limitations was invaluable. As a member of the BTSYM subcommittee, I was
particularly proud to see the enthusiasm and engagement from all participants. The collaboration with Bekaert allowed us to offer a unique learning experience that combined theoretical knowledge with practical application. It was rewarding to witness the dynamic discussions of young engineers to explore sustainable and innovative solutions in tunnelling. This event highlighted the important role of such workshops in fostering professional growth and advancing our industry.
Author Jess Xu – AtkinsRéalis – Ground Engineering & Tunnelling, and Member of the BTSYM subcommittees
Quality control methods and equipment’s, including
the wash-out test, EyeD machine, and UPC device, were highlighted to ensure the highest standards in construction. The practical session, held in the afternoon, was a
highlight for many attendees. Participants engaged in exercises using Bekaert’s software to design segmental linings, hybrid designs for cut-and-cover tunnel slabs/walls, and moment capacity designs for slope stabilisation and sprayed concrete linings. These exercises provided valuable insights into the practical aspects of tunnel lining design and the innovative use of SFRC.
CASE STUDIES During our presentation, we covered a few case studies highlighting the advantages of designing with steel fibres versus traditional reinforcement and demonstrating the benefits in terms of carbon savings, reduced concrete cover and enhanced durability. Some case studies were presented, as follows:
Grand Paris Express Line 16 (France) ● Application: Precast segmental lining ● Highlights: 11,000 tons of CO₂ saved per 10km ● Key Focus: Carbon reduction, logistics efficiency
Montreal Blue Line Extension (Canada) ● Application: Precast segmental lining
Above: Wet concrete and steel fibres June 2025 | 27
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45
