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Evolution law and calculation model of closure time in artificial ground freezing
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-10 , DOI: 10.1016/j.tust.2024.106358
Xu Li, Shuang Liu, Xiao-kang Li, Zu-run Yue

Artificial ground freezing (AGF) is a widely utilized underground support method, with the closure time (tc) of frozen wall being one of the primary concerns. However, the multiple environmental and engineering factors result in complex evolution law and insufficient calculation model of tc. This study conducts a numerical orthogonal test on tc considering eight physical factors, including seepage velocity, pipe space, freeze temperature, environmental temperature, tunnel diameter, soil thermal conductivity, soil heat capacity and saturated water content. Subsequently, a comprehensive tc calculation model incorporating the above factors is proposed based on test results. The results show that seepage velocity and pipe space are two primary factors affecting tc, with a contribution rate of 33% and 29%, and the rest are secondary factors. Furthermore, a basic tc calculation model considering two primary factors is proposed, providing a practical selection table in AGF design. In addition, the six secondary factors can be normalized into two physically introduced parameters: heat transfer efficiency and cooling demand, which are solely related to tc, yielding a comprehensive tc model involving eight factors. The proposed comprehensive tc model is applicable in multiple scales and engineering cases. This study can provide a reference for AGF design in complex underground conditions.

中文翻译:


人工地面冻结中闭合时间的演化规律及计算模型



人工地层冻结 (AGF) 是一种广泛使用的地下支护方法,冻结墙的闭合时间 (tc) 是主要关注点之一。然而,多重环境和工程因素导致演化规律复杂,tc 计算模型不足。本研究考虑了渗流速度、管道间距、冻结温度、环境温度、隧道直径、土壤导热系数、土壤热容和饱和含水率等 8 个物理因素,对 tc 进行了数值正交试验。随后,根据测试结果提出了一个综合考虑上述因素的 tc 计算模型。结果表明:渗流速度和管间距是影响 tc 的 2 个主要因素,贡献率分别为 33% 和 29%,其余为次要因素。此外,提出了一种考虑两个主要因素的基本 tc 计算模型,为 AGF 设计提供了一个实用的选择表。此外,这 6 个次要因素可以归一化为两个物理引入的参数:传热效率和冷却需求,它们仅与 tc 相关,从而产生一个涉及 8 个因素的综合 tc 模型。所提出的综合 tc 模型适用于多尺度和工程案例。该研究可为复杂地下条件下的 AGF 设计提供参考。
更新日期:2025-01-10
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