| CONTENTS


TECHNICAL Ground investigation


10


Three-spoke anti-clogging cutterhead on AVN1800 Image credit: Valentin Environnement (via Herrenknecht)


10 17


Comment 3 17


22 30


26 34


REGULARS 7 News 42 Events


22 26


30 34


GI for pipejacking G. Lehmann, C. Mosdzin


Discussion on geotechnical investigations necessary to benefit the application and design of pipejacking TBMs on small diameter tunnel projects.


INSIGHT Ventilation


Refurbishment case study I. Riess


Challenges of refurbishing the ventilation systems in operating tunnels are many, and the case of decisions at Giswil road tunnel, in Switzerland, are examined.


SECTORS Transport, Water


US


Updates on a range of key underground projects in the US, from coast to coast, including in New York, Virginia and California.


Canada Milestones met on some of the key transport and energy projects in Toronto, Montreal, Vancouver, and more.


Latin America Metro tunnel projects making key progress in Brazil, Chile and Panama.


Asia Projects in Asia Data on tunnel-related project pipeline value in different global regions, now led North-East Asia (and China), plus spotlights on project milestones elsewhere in Asia.


January 2026 | 5


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