Feature Article
Jul 30, 2022
Have You Heard of Stacked Drifts?
Abstract
The use of “stacked drifts” in the sequential excavation method of tunnelling has been employed for over four decades and has allowed for the construction of tunnels and underground caverns approaching nearly 30-m width under clear cover thickness of 5 m or less, more typically in soft ground geology. The method essentially involves constructing a series of smaller-diameter tunnels, configured side-by-side, arched, and/or vertically “stacked.” Typically, each small tunnel is backfilled with concrete and linked to adjacent tunnels with mechanical or shear interlocks to either directly form or facilitate the construction of a single, larger-diameter tunnel or underground cavity.
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© 2022 American Society of Civil Engineers.
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Published in print: Feb 1, 2022
Published online: Jul 30, 2022
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Andrew G. Cushing, M.ASCE
P.Eng
Senior Geotechnical and Tunneling Engineer, Arup; Toronto, ON, Canada
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.