Large and smaller underground works are a significant part of the mature infrastructure development market in North America, yet more new tunnels are needed as societal and economic demands grow, and existing assets age. Tunneling in North America is becoming more


important than ever. For the last 25 years it has been T&T North America’s


Above and below: Tunnel projects large and small, across all sectors, and for new and


replacement works, are the many and varied features of growing underground


infrastructure works in the mature yet expanding market of North America


pleasure to discuss and learn from industry participants about all manner of needs, project designs, construction solutions, technological developments, and challenges faced – and overcome – to share with readers across the continent. Since its launch in 1999, T&TNA has steadfastly reported on the enormous market across the US and Canada, primarily, but also looking at projects in other parts of the Americas. Ahead, many new tunnel projects will be planned.


Presently, detailed design work is underway on more, and procurement has been initiated on still others. Many are breaking ground and starting construction while others are well advanced in execution. One by one, their excavations advance and complete, each engaging with the uncertainties around geology, such as can be known and risk management for, before metal meets rock. Challenges accepted and undertaken, in pursuit of engineered visions that serve communities, industries, society. People. Generations of people, and communities, first


envisioning benefits from infrastructure, including underground, and then being able to use such, in reality. But assets need serviced, operated and maintained. They age. Sometimes their capacities are, coincidentally, no longer sufficient as real-world growth outstrips the


previously expected demand. As such, and increasingly, the mature market of underground infrastructure also has opportunities to refurbish and rehabilitate, and refresh and renew, and enlarge and expand so much of what has already been built. The sum of what has gone before is taken forward,


and added to – also with new, first-time works, in many places, from urban centres to airfields, from river crossings to coastlines, and many sectors served. Mostly, though, the Transport (roads, rail/subway) and Utilities (water, sewage/stormwater) sectors. There are some long tunnels, too, for carrying gas pipelines and high-voltage power cables, as their grid networks renew or expand. Other energy sector tunnels involve hydropower, including large river diversion tunnels. Mostly, underground works are undertaken in pursuit


of long, linear objectives – classic tunnels, in the popular imagination – such as for subways, sewers and roads. But there caverns have also been hollowed out, for subway and rail stations, for high-energy physics R&D, and hydropower. And, the latter may see more caverns, plus of course mazes of classic tunnels (as more interest is shown in shafts, tailraces, penstocks, and tailraces – plus access tunnels) along with large underground halls for new closed-loop pumped storage projects in the current era where increasing use of renewables brings a vital need for fast-response grid stability. Over the last 25 years, T&TNA has covered the wide


variety of tunnel industry activities, projects and players across the region, and we look forward to continuing to do so over the next 25 years.


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