Visiting Germany’s Rastatt Tunnel

The exponential development of technology means that I am called upon less and less frequently to pack a bag and carry out a site visit IN REAL LIFE! Make no mistake there is no substitute for visiting a project in person. The story is better, the photos are better, the report is better. But the reality is that magazines don’t have much travel budget these days and the information kept by project teams is better than ever (usually) and so I find myself increasingly asked to call site teams using Skype or the old fashioned telephone and write the story from London.

Every now and then though, I inveigle my way onto a live project and get to meet the amazing people bringing the ideas for improving connectivity, providing essential services and improving economic growth to life. In Germany recently Jörg, Ursula, Martin, Sören and Ulrich of the Hochtief/Ed Züblin joint venture took time out of their 12 hour day (at least!) to talk to me about creation of the incredible Rastatt Tunnel.

But first I had to get there……..

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Tunnel Vision

Over the past couple of weeks I have been looking into the research that is underway at UK institutions related to tunnelling. There was more than I expected. My 2000 word article is currently 3124 words. But I can’t bear to cut anything out. Should I omit some of the amazing work underway at Cambridge University which is using increasingly sophisticated sensors to give real time data that can be compared with the centrifugal and numerical model data? Or should I edit back the report on work at Edinburgh University where explosive spalling of concrete during fire and the influence of ventilation are major research topics?

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Edinburgh University’s testing rig for studying the explosive spalling behaviour of concrete during a fire

I could miss out some of the incredible work being done at the University of Leeds Institute of Resilient Infrastructure where world leading research is being carried out into the cumulative effect of seismic loading on tunnels – something that design codes don’t currently cover. They are going to use sensors on two live tunnels in Chile where there there is an astonishing amount of earthquakes every month. Have a guess how many (the article will tell you – unless I have to cut that part)!

With the raft of tunnels planned in cities around the world the research at Imperial College London into the effect of tunnelling on existing tunnels, surely must be included. More specifically the university has carried out an incredibly detailed study into the impact on cast iron tunnels. Similarly Nottingham University is focused on the interaction between tunnels and buildings and its research is giving more effective tools for evaluating the effects of tunnelling on piled structures. City University too is focused on tunnel/structure interaction as well as undertaking research supported by the Pipe Jacking Association.  A current research project looks at the effect of tunnel excavation on escalator tunnels. Another focuses on ground support at the tunnel face and the effects on stability and surface settlement.

New technology and construction methods too have to be included. Dr Alan Bloodworth, who this week took over as the head of the UK’s only dedicated tunnelling and underground space MSc at Warwick University, has been studying sprayed waterproof lining systems, examining whether composite action occurs between the primary and secondary sprayed concrete linings due to the bonded waterproof layer (it does). How can I cut that?

And what about the future? Universities have research plans a plenty. I simply must include those or how will people know that Cambridge wants to create virtual tunnelling models and research the redistribution of loads around cross passages; that Edinburgh is working on new design strategies for mitigating concrete spalling in tunnels during fire or that Leeds University will create a virtual platform where the public can view the earthquake response of tunnels in Chile?

As I said there was more than I expected. There is nothing boring about tunnels!