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首页> 外文期刊>Cold regions science and technology >Modeling the performance of an air convection embankment (ACE) with thermal berm over ice-rich permafrost, Lost Chicken Creek, Alaska
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Modeling the performance of an air convection embankment (ACE) with thermal berm over ice-rich permafrost, Lost Chicken Creek, Alaska

机译：在阿拉斯加的失落的鸡溪，对富含冰的多年冻土带热护堤的空气对流路堤（ACE）的性能进行建模

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Construction of roadway embankments over permafrost often results in settlement due to thawing of ice-rich foundation soils. The air convection embankment (ACE) is a relatively new design developed to reduce thaw settlement. In 2012 an ACE and an adjacent thermal berm were constructed as part of a realignment of the Taylor Highway near Lost Chicken Creek, Alaska. The Taylor Highway, a minor roadway with a gravel surface, is closed and not maintained during the winter months. To evaluate the thermal performance of the newly-constructed ACE and thermal berm, we performed field work and laboratory testing to determine foundation soil and embankment properties, measured temperatures at the base of the embankment, and developed two-dimensional finite element models to estimate long-term stability. Measurements indicated temperatures beneath the ACE were significantly colder than beneath the thermal berm. In the modeling, we simulated plowed (PC) and snow-covered (SC) conditions. Both models indicated that the ACE experienced density-driven air convection during the winter months. The PC scenario produced significantly colder temperatures within the ACE and underlying foundation soils. The SC model results more closely matched measured temperatures beneath the ACE, which is reasonable considering the lack of maintenance on the Taylor Highway during winter. The modeling indicates that ACE performance is improved through plowing of the surface, and that an ACE is more effective in maintaining frozen conditions in the foundation soils than the thermal berm; in fact, the modeling and measured temperatures indicate that the thermal berm actually raises the temperature in the foundation soils. Based on the results, we expect that thaw settlement will occur beneath the thermal berm until thermal equilibrium is reached, whereas the majority of the ACE will remain stable. (C) 2016 Elsevier B.V. All rights reserved.
机译：多年冻土上方的路堤施工通常会因富含冰的基​​础土壤融化而导致沉降。空气对流路堤（ACE）是一种相对较新的设计，旨在减少融化沉降。 2012年，在阿拉斯加失落的鸡溪附近的泰勒高速公路改建工程中，建造了ACE和相邻的热护堤。泰勒高速公路（Taylor Highway）是一条具有砾石表面的次要道路，冬季不开放，也不进行维护。为了评估新建的ACE和热护堤的热性能，我们进行了现场工作和实验室测试，以确定基础土壤和路堤性能，在路堤底部测量温度，并开发了二维有限元模型来估算长长期稳定性。测量表明，ACE下的温度比热护床下的温度明显低。在建模中，我们模拟了耕犁（PC）和积雪（SC）的状况。两种模型都表明，ACE在冬季月份经历了密度驱动的空气对流。 PC方案在ACE和基础土壤中产生了明显较低的温度。 SC模型的结果与ACE下的实测温度更加匹配，考虑到冬季泰勒高速公路缺乏维护，这是合理的。该模型表明，通过耕作表面可以改善ACE性能，并且与热护堤相比，ACE可以更有效地保持基础土壤中的冷冻条件。实际上，建模和测得的温度表明，热护层实际上提高了基础土壤的温度。根据结果​​，我们预计融化沉降将在热护堤下方发生，直到达到热平衡为止，而大多数ACE将保持稳定。 （C）2016 Elsevier B.V.保留所有权利。

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