Latest from Tunnels and Tunnelling


Mothballed TBM generates multi-million storage costs
18 January, 2021 A giant EPBM that was due to bore one of Spain’s Guadalquivir River crossings but instead has been in storage for nine years has generated storage costs of €11m (US$13.3m).
  • Tunnelling starts on Mumbai coastal project
    India’s largest TBM has been launched to excavate two 3.4km-long tunnels forming part of the Coastal Road Project – a 22km freeway running along Mumbai’s western seafront.
  • TBM starts work on final Tideway stretch
    Delivered in July – having travelled by water from Germany via Holland and the River Thames to the site near Tower Bridge – TBM Selina has broken ground at Chambers Wharf to start mining the final easternmost stretch of London’s 25km-long Tideway Tunnel.
  • Construction to start on Pawtucket Tunnel
    Joint venture contractor CB3A has received a notice to proceed from Narragansett Bay Commission for the design and construction of the US$480m Pawtucket Tunnel Project in Rhode Island, US.


The third way
16 December, 2020 Genoa has a magnificent sea port but desperately poor communications inland. A third route is being developed under the mountains that surround the city. Julian Champkin reports
  • Design and planning of large-diameter underground surge shafts
    Rakesh Khali, Group Project Manager, HCC, India, and Naveen Bahuguna, General Manager-Geotech, RIL, India, discuss the design and planning of the support and construction sequences of two shafts in different ground conditions and the monitoring performance during construction
  • Client expectations
    Those who have worked on underground projects will know that being an exceptional designer requires many different qualities to those required to be an excellent contractor. However, one of the elements of success that can always be improved upon (regardless of whether you are a designer or contractor) is a strong and clear understanding of the owner’s expectations. This depends directly on the degree of communication with the client at different phases of the project and the ability to put ourselves in their shoes and see what merits and virtues they are looking for when choosing the best teams for their projects. I recently had a chance to discuss these matters with several clients in Canada, and the following is a selection of the most important qualities they talked about.
  • Metro moves down under
    Sydney is growing fast, and its transport infrastructure needs to catch up even if the city’s famous harbour is in the way. Julian Champkin reports on a major expansion of the Sydney metro.