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NATM (New Austrian Tunnelling Method) was pioneered by three notable Austrian engineers in the 1960s, and was published in a series of papers between 1969 and 1978. In the same year Dr Ralph Peck presented the 'observational method' to the geotechnical community in his 1969 Rankine lecture.
Following the Heathrow tunnel collapse in 1994 the ICE published a NATM design guide, along with a HSE publication in response to concerns for safety tunnelling to NATM. Where are we today, are we still tunnelling to true NATM or observational methods or is it SCL tunnelling?
The presentation will give a brief overview of these tunnelling methods exploring definitions, and case a history tunnelling using SCL.
Speakers: Ewart Pritchard is a chartered civil engineer with his background in geotechnical design. He is now a Project Manager with a specialist Tunnelling and shaft sinking contractor Joseph Gallagher limited.