高纬度林区多年冻土片块石路基降温效果及变形特征
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U416.1+68

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国家自然科学基金项目(41807230);国有企业委托项目(3-4-2020-003)


Study on cooling effect and deformation characteristics of permafrost rubble subgrade in high latitude forest area
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National Natural Science Foundation of China (41807230); Entrusted projects of state-owned enterprises (3-4-2020-003)

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    摘要:

    在边坡滑塌、不均匀沉陷等路基病害极易发生的多年冻土区,片块石路基是一种常见的路基结构,而其在高纬度林区的应用研究还相对较少。本文针对高纬度林区多年冻土体积含冰率高、对温度变化敏感等特征,以高纬度林区某段公路多年冻土片块石路基工程为例,建立冻融循环热力耦合数值模型,分析了片块石路基温度场和应力-应变场的变化规律,研究了路基冻胀融沉的热力学机制。结果表明:高纬度林区多年冻土片块石路基的温度场,在地下2 m内受地表温度影响显著,而地下2 m以下受影响较小,温度稳定在-1.5 ℃。多年冻土片块石路基的变形以融沉为主,在11月达到最大值,为13.5 mm;而冻胀量在4月达到最大值,为7.5 mm。路基融沉主要归因于冻土的融化,而路基冻胀是由于路基结构本身的冻胀变形引起的。因此,在高纬度林区多年冻土路基采用片块石冲压层和填筑层的结构是可行的,对路基下冻土起到良好降温效果的同时,路基的变形量也控制在了规范要求范围内。

    Abstract:

    In the permafrost region, hazards such as landslides and uneven subsidence may occur and the rubble subgrade is a common structure. However, there are a few studies on its application in high-latitude forest areas. These areas have high volumetric ice content and are sensitive to temperature changes. Here, a freeze-thaw cycle thermal coupling numerical model of a type rubble subgrade was established, through which the temperature and stress-strain fields of the rubble subgrade were analyzed, and the thermodynamic mechanism of subgrade frost heave and thaw settlement were studied. The results showed that the temperature field of the rubble subgrade was significantly affected by the surface temperature within 2 m underground. When it was more than 2 m, the influence was small and the temperature was stable at -1.5 ℃. Besides, the deformation of the subgrade was dominated by thaw settlement, which reached a maximum of 13.5 mm in November, and the frost heave reached a maximum of 7.5 mm in April. Thaw settlement of the subgrade was mainly caused by the thawing of the frozen soil, while the subgrade’s frost heave was from the deformation of the subgrade itself. Therefore, it is feasible to use the rubble subgrade structure in high-latitude forest areas, which has a cooling effect on the frozen soil, and the deformation of the subgrade can meet specification requirements.

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叶锦华,王丽群,许智博,等. 高纬度林区多年冻土片块石路基降温效果及变形特征[J]. 科学技术与工程, 2022, 22(20): 8893-8900.
Ye Jinhua, Wang Liqun, Xu Zhibo, et al. Study on cooling effect and deformation characteristics of permafrost rubble subgrade in high latitude forest area[J]. Science Technology and Engineering,2022,22(20):8893-8900.

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  • 收稿日期:2021-10-12
  • 最后修改日期:2022-04-14
  • 录用日期:2022-03-03
  • 在线发布日期: 2022-08-04
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