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Numerical study on the effect of frost heave prevention with different canal lining structures in seasonally frozen ground regions

机译：季节冻土区不同渠道衬砌结构防冻胀效果的数值研究

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摘要

Frost heave damage problems in canal linings are a common phenomenon in seasonally frozen ground regions. These problems are regarded as interactions between heat transport and moisture flow processes. To research the influence of frost heave prevention in two types of canal structures in the Ningxia irrigation district of China, a two-dimensional coupled heat transport and moisture flow model was used to analyze temperature characteristics in the traditional canal lining structure and a new type of canal lining structure for frost heave prevention. The simulated results from this numerical model are in agreement with in situ temperature measurements for both canal lining structures. The in situ measurement results show that the new canal lining structure exhibits low seepage, low thermal conductivity, quick drainage speed and less uneven deformation. Therefore, this new canal lining structure is a good choice for frost heave prevention in seasonally frozen ground regions.
机译：在季节性冻土地区，渠道衬砌的冻胀破坏问题是常见现象。这些问题被认为是传热和水分流动过程之间的相互作用。为了研究防冻胀对宁夏灌区两类渠道结构的影响，采用二维热传导和水汽耦合模型，分析了传统渠道衬砌结构中的温度特性和一种新型的渠道结构。运河衬砌结构可防止冻胀。该数值模型的模拟结果与两种渠道衬砌结构的现场温度测量结果一致。现场测量结果表明，新的渠道衬砌结构具有低渗漏，低热导率，排水速度快，变形不均少的特点。因此，这种新的渠道衬砌结构是季节性冻土地区防冻胀的理想选择。

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