Air duct systems for roadway stabilization over permafrost areas

Zarling, John P.; Connor, Billy; Goering, Douglas J.

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Air duct systems for roadway stabilization over permafrost areas

1984-03-01
By Zarling, John P. ; Connor, Billy ; Goering, Douglas J.

[PDF-2.25 MB]

English

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Creators:

Zarling, John P. ; Connor, Billy ; Goering, Douglas J.

Zarling, John P. ; Connor, Billy ; Goering, Douglas J. Less -
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Air Conditioning Systems Air Ducts Alaska Base Course (Pavements) Computer Simulation Models Corrugated Metal Culverts Design Ducts Frozen Soils Heat Flow Permafrost Slope Stability Stabilization Thermal Stresses
Publication/ Report Number:

FHWA-AK-RD-84-10
Resource Type:

Research Paper
Geographical Coverage:

Alaska
Corporate Publisher:

Alaska. Department of Transportation and Public Facilities
Abstract:

In the discontinuous permafrost regions of Alaska it is not always possible to route roads over non-permafrost ground. For areas like these, highway engineers face a tremendous design challenge in attempting to provide a stable roadway base. Several active and passive systems have been used in the past to protect the underlying permafrost from thermal degradation. In Alaska, small diameter corrugated metal pipes (culverts) have been placed in the fill materila covering the underlying permafrost. Both ends of the culverts are brought to the surface with one end having a long vertical section attached to serve as a stack. Cold air enters the lower end of the culvert, flows through the horizontal section under the roadway cooling the ground (warming the air) and then exits through the vertical stack at the other end of the culvert. Flow is established by the stack or chimney effect, i.e. the warm air is forced up and out of the vertical stack by the heavier surrounding ambient cold air. This report presents the results of both an experimental and analytical research program undertaken to develop design criteria for air duct systems. An experimental duct was assembled and instrumented to determine the relationship between air flow rates and temperature difference, heat transfer rate, air duct length, stack height, etc. A finite element computer model has also been used to investigate the placement of the air duct under the roadway. Optimum design of an air duct system would allow sufficient winter cooling of the ground so that degradation of the underlying permafrost would not occur during the summer thawing season. Temperature contours resulting from the finite element simulations showing the effects of air duct placement on the thermal regime are presented.
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:dcd8f6619030292234cf1ec3cf37f32e97b1eaa68c1f73ed83956b8c5e503b77
Download URL:

https://rosap.ntl.bts.gov/view/dot/14772/dot_14772_DS1.pdf
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Air duct systems for roadway stabilization over permafrost areas

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