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  The first on-site comparison between NATM and ADECO-RS during construction of the “Dubler Kurortnogo prospekta” tunnels in Sochi (Russia)

  The XXII Winter Olympic games in Sochi (Russia), that took place from February 7-23, 2014, were marked by major investments aimed at overcoming the city’s lack of infrastructures and to improve its transport network. One of these projects is the new Sochi motorway, also known as “The alternative to the Kurortnyi road”, which runs parallel to the Black Ssea and makes it possible to reach the Olympic sites and the Adler airport without having to cross the city. Construction of the new artery, of decisive and strategic importance, required the construction of eight double-bore natural tunnels, as well as open-cut sections, embankments and bridges for a total length of 16 kilometres. Due to the difficulties caused by the nature of the grounds and the short amount of time available for construction, the Russian Federation decided to maximise productivity and minimise risk by adopting the ADECO-RS approach for the design and construction of the T8 and T8A tunnels (these two being the longest and most complex of the motorway). This approach had previously proven its reliability during the construction of the new Bologna-Florence high speed railway; tunnelling for over 100 km in similar grounds to those of Sochi. The T8 and T8A tunnels are therefore of interest given that the other tunnels of the same motorway by-pass (facing similar ground conditions, even if shorter and less difficult overall) have been excavated by adopting the NATM,

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