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News » US » AASHTO publishes road tunnel guidance » published 19 Jul 2017

AASHTO publishes road tunnel guidance

New design and construction guidance for road tunnels has been published by the American Association of State Highway Transportation Officials (AASHTO).

The guide specifications are for the load and resistance factor design (LRFD) and construction of road tunnels). Publication of the LRFD Tunnel Design & Construction Guide Specifications is the result of a five-year research effort by WSP USA carried out under a task order from the National Cooperative Highway Research Program (NCHRP).

The specifications are intended for the design, evaluation and rehabilitation of road tunnels constructed using cut-and-cover, bored, mined, and immersed tunnel construction methodologies. In developing the specifications, consideration was given to safety and operations, maintenance, and inspection of tunnel systems. “The publication, the first national design and construction specifications for road tunnels, represents groundbreaking work to advance and support the professional practice in tunnel and underground engineering in the United States,” said WSP.

The recommended LRFD-based tunnel design methodology used to develop the guide is presented in the final NCHRP research report. A literature search was performed to review existing design codes and standards, project-specific design criteria, reports and technical publications. Limited calibration of the load factors was performed based on results from the analysis of a circular bored tunnel. A summary of the calibration procedure is presented in the report.

The report is available from AASHTO.



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This article was published on 19 Jul 2017 (last updated on 19 Jul 2017).

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