原文传递
Permafrost Stabilization
| 题名： | Permafrost Stabilization |
| 作者： | Douglas J. Gioering, Ph.D., P.E. |
| 关键词： | cold regions, deformation, embankment, highway, instrumentation, permafrost, road, settlement, stabilization, thaw-settlement |
| 摘要： | This report describes the thermal performance of an experimental Air Convection Emhankment (ACE) that was included as an experimental feature in the Parks/Chena Ridge Interchange project (Federal Project No. I-0A4-5(7), State of Alaska Project No. 63538). Data is included for October 1998 through September 1999. Additional reports by the same author (cited in this report) describe the design and construction of the ACE experimental feature, and data analyses that cover the period from November, 1996 through September, 1998. ACE is composed of coarse, open-graded fill material that promotes circulation of air throughout the embankment mass during winter, thus cooling and preserving underlying permafrost foundation soils. Natural wintertime temperature gradients are established within the extremely porous ACE, and produce unstable conditions throughout the enclosed air mass. These instabilities initiate and sustain convective air cells that remove heat from underlying foundation soils, and eject heat at the cold embankment surface. The summertime temperature gradient within the embankment produces stable conditions, so air circulation ceases within the embankment The overall effect is that the entire embankment becomes a passive, 1-way heat valve, i.e., a refrigeration system that helps protect ice-rich foundation materials from thaw and loss of strength. Results to date indicate that the system is performing successfully. |
| 报告类型： | 科技报告 |
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