| COMMENT EDITORIAL
EDITOR: Patrick Reynolds MEng, GMICE +44 (0)7890 122047
editor@tunnelsandtunnelling.com
FEATURE WRITER: Julian Champkin
julian.champkin@
tunnelsandtunnelling.com NEWS WRITER: Keren Falwell DESIGNER/ART EDITOR: Adam McNamara ADVERTISING
PRESSURES AND PATIENCE
Pressures come from within and without, generated by the tangible or conjured from the intangible. Construction - and so much else in life - deals with both. Most explicitly, there are types of
geology that, when interrupted by excavated openings can construction risk. Pressures applied, over lengths of tunnel and areas of cross-section, come to be load, and difficulties, potentially. Soft ground can have challenges, and hard rock geologies, too - such as squeezing ground conditions. In this issue, we have a paper
that considers squeezing ground, in particular creep versus consolidation, and the challenges presented to shield tunnelling in hard rock. The paper discusses: first, the mechanics, including the role of pore water, over the long- and short-term; second, how transferable is experience, to benefit later excavations close-by or more immediately adjacent, whether they be larger or smaller diameter. Each circumstance is a different
problem. No easy or universal answer comes to pass. But a key takeaway is an issue that is long known, always sought, frequently asked for and yet,
unfortunately, not always funded: a sufficient site investigation. Quite a few instances of difficult
rock conditions have faced tunnellers in the Alps over decades. The Brenner Base Tunnel has built a full-length exploratory tunnel to help with the question of ground investigation to support design, procurement and construction optimization. Some challenging ground was met and overcome, at different times and in different places. The colossal three-tube project has now come far. Patiently pursued, from early probing onward, the huge project’s tunnelling task is on the home run. We review what has been achieved, after many milestones celebrations in recent months. Beyond excavations, tunnels have
much longer lifetimes. Asset owners have important needs in those phases too. In road tunnels, for example, the needs of drivers to be well served with safe illumination. We spotlight the how London’s Silvertown tunnel has succeeded, after coming into service earlier this year.
Patrick Reynolds Editor
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Roger Bridge (chair) BEng, ACSM, FIMMM John Corcoran (BTS Chair) CEng MICE FICE Arabel Vilas Serín (BTSYM) MEng MSc DIC CEng MICE Divik Bandopadhyaya BEng (Hons) MSc GMICE Kate Cooksey MEng, CEng, MICE Rosa Diez CEng, BSc (Hons), DIC, FGS, MIMMM Ken Kwok MSc, BSc, MHKIE, MIMMM Dr Donald Lamont MBE, PhD, CEng, FICE Darren Page BSc, MSc, CEng, CGeol, MIMMM, FGS David Terry BEng, CEng, FIMMM, FICE Ivor Thomas BEng, LLB, CEng, FICE
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