Publications

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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Quality and Risk Management Considerations for Very Shallow Soft Ground Conventional Tunnelling in Urban Settings

Synopsis: The construction of shallow mined tunnels in urban settings is frequently undertaken by use of conventional tunneling methods.  In

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Examination of Shotcrete Liner at Devil’s Slide Tunnel Utilizing ASTM 1550 Field Test Results and Back Analysis

Synopsis: The Devil’s Slide Tunnel project, located south of San Francisco along Highway 1, consists of twin bore tunnels approximately

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Design Guidelines for Sequential Excavation Method (SEM) Practices for Road Tunnels in the United States

Synopsis: In the last 20 years the Sequential Excavation Method (SEM) or the New Austrian Tunneling Method (NATM) has been

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Past and Present Soft Ground NATM for Tunnel and Shaft Construction for the Washington, D.C. Metro

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

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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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