Latest from Tunnels and Tunnelling


Delhi Metro inviting bids for Phase 4 tunnelling works
14 April, 2021 Delhi Metro Rail Corp (DMRC) is inviting bids from parties in eligible countries for the design and construction of twin tunnels by shield TBM on the 20.2km Aerocity to Tughlakabad Corridor of the Delhi Metro Rapid Transit (DMRT) Project Phase 4.
  • Sandvik launches DT923i drill rig
    “Uncompromised accuracy and productivity” are claimed by Sandvik to be among the benefits of its newly introduced DT923i jumbo rig designed for high-power face drilling in tunnels and caverns.
  • Early breakthrough achieved on Paka Tunnel
    A first tunnelling breakthrough has been achieved six months ahead of schedule on Malaysia’s East Coast Rail Link (ECRL) despite the challenges faced by the project during the past three years.
  • Three bidders shortlisted for Lower Thames Crossing
    Highways England has named three construction/engineering companies which it has shortlisted to build the proposed Lower Thames Crossing – destined to be the longest road tunnel in Britain and hailed as the most ambitious UK roads project for a generation.


Collaboration, communication and competence updated
25 March, 2021 The following article by Bob Ibell, founder and director of London Bridge Associates, is based on a past Harding Lecture and has been updated by the author in celebration of the BTS 50th Anniversary
  • National grids
    Utility grid projects bring a variety of tunnelling challenges. Report by Patrick Reynolds
  • Review of ITA working group 12 PSCL linings
    Martin Knights, Independent Consulting Engineer, former ITA President and Chair of London Bridge Associates reviews the new ITA Working Group 12: Permanent Sprayed Concrete Linings guidelines
  • Grouting for ground improvement
    Grouting in underground projects refers to the injection of pumpable materials into soil or rock formations to change their physical characteristics. It is one of the most used ground improvement techniques for underground projects and tunnelling applications.
  • Brexit and its effect on standards
    Donald Lamont, a member of T&T’s Editorial Advisory Board and a member of ‘CEN/TC151 Construction machinery – safety’ looks at the impact of Brexit on machinery standards in the UK