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Mechanical properties of the active layer for pavement design in permafrost conditions

机译:多年冻土条件下用于路面设计的活性层的机械性能

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When designing road and airfield embankments over permafrost, thermal stability of the subgrade soil is often considered to be a key consideration for the overall stability of the structure. When the facility is built over thaw sensitive soil, the general approach is to attempt to raise the permafrost level underneath the embankment in order to avoid the risk of thermal degradation of thaw sensitive soils. However, in many cases, part of the active layer underneath the pavement is subject to thawing during summer. Information on the mechanical properties of thawing soils in a permafrost context is scarce and this factor is rarely taken into consideration when designing pavements to be constructed in permafrost regions. This paper summarizes the findings of a study of the mechanical properties of soils in the active layer near the Tasiujaq airstrip in Nunavik (Quebec, Canada). The study was done using the dynamic cone penetrometer and the light-weight deflectometer. The paper will also discuss the practical implications for pavement design considerations.
机译:当设计永久冻土的道路和机场路堤时,路基土壤的热稳定性通常被认为是结构整体稳定性的关键考虑因素。当设施建在融化土壤上时,通常的方法是尝试提高路堤下的永久冻土层,以避免融化土壤热降解的风险。但是,在许多情况下,人行道下方的部分活性层会在夏季融化。关于在多年冻土环境中融化土壤的力学特性的信息很少,在设计要在多年冻土地区建造的路面时,很少考虑该因素。本文总结了对努纳维克(加拿大魁北克)Tasiujaq简易机场附近活性层中土壤力学特性的研究结果。这项研究是使用动态锥形透度计和轻型挠度计完成的。本文还将讨论路面设计注意事项的实际含义。

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