Case studies: Frozen ground design and construction
in Kotzebue, Alaska |
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Authors: | Daniel Nichols |
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Institution: | DOWL HKM, Anchorage, Alaska 99503, USA |
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Abstract: | Alaska has many construction design challenges due to permafrost. Due to either climate changes or human activities and development,
permafrost often becomes unstable. Unstable soils can cause thaw settlement, frost jacking, or heaving. These can
cause damage to infrastructure, increase maintenance costs, and decrease the life of construction projects. Kotzebue, Alaska, a
remote village in the northwest arctic part of Alaska, is ideal for observing such permafrost effects on infrastructure. Three
case studies of Kotzebue construction projects are reviewed here: the Front Loop Water Main Extension, which shows the importance
of both passive and active freeze thaw protection for water service pipes and how to minimize differential movement
between pipes and buildings; the Wastewater Lift Station Replacement, which describes methods for reducing thaw settlement
in buildings over time when it is not feasible to prevent thaw settlement, and compares the benefits of frozen ground excavation
over traditional excavation practices; and the Ted Stevens Way Rehabilitation, which discusses the effectiveness of 2001
best design practices for gravel road construction over tundra and permafrost, identifies their design and construction failures,
and proposes future solutions. |
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Keywords: | construction permafrost utilities engineering thaw protection |
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