Our dedicated team of experts are authors and co-authors of several technical papers on the subject of tunneling and geotechnical engineering.

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Implementation of Conventional Tunneling in a Design-Build Contract in the US

Synopsis: Historically, conventional tunneling also referred to as NATM and more recently SEM in the US has been executed in

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Modeling of Pipe Arch Canopies in Shallow Soft Ground Tunnels Constructed by Sequential Excavation Methods

Synopsis: The New Austrian Tunneling Method (NATM), also referred as Sequential Excavation Method (SEM), has found application in soft ground

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History and Recent Developments in Soft Ground NATM Tunneling for the Washington, D.C. Metro

Synopsis: The first application of soft ground NATM in the US was on Washington, DC Metro’s Section E5 Fort Totten

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Experience With Synthetic Fiber Reinforced Initial Shotcrete Lining At The Devil’s Slide Tunnel Projects

Synopsis: The conventional tunnel design of the Devil’s Slide Tunnel project near San Francisco, California anticipates relatively large deformation in

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Selection of Alignment and Tunnelling Methods in Urban Settings

Synopsis: One of the challenges of the 21st century in urban settings is to provide solutions to increasing traffic.  The

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Pre-Support Measures for Shallow NATM Tunneling in Urban Settings

Synopsis: Pre-support measures for urban tunneling have seen a substantial development in the recent past. Ground improvement techniques, pipe-arch and

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The Dulles Corridor Metrorail Project – Tunneling Options for Tysons Corner

Synopsis: Metropolitan Washington Airport Authority is currently undertaking the first Phase of Metro’s Extension to Northern Virginia. A wide range

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Fiber Reinforced Shotcrete for Tunnel Linings

Synopsis: The use of shotcrete for ground support is well established since several decades. However, the development of high quality

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