渗流地层人工冻结壁交圈时间计算方法

doi:10.13722/j.cnki.jrme.2022.0545

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摘要为解决目前相关设计规范中尚无渗流地层人工冻结壁设计及计算方法的问题，利用COMSOL Multiphysics有限元软件实现渗透地层温度–渗流场耦合计算，并通过室内试验对计算结果进行验证。通过数值计算研究温度场随渗流速度、冻结管间距、冷媒温度变化的发展规律。结果表明：当地下水渗流速度大于临界渗流速度时，冻结壁不交圈，临界渗流速度与冻结温度梯度之间存在具有良好的线性关系；通过对二者关系进行拟合，提出临界渗流速度的计算方法。借鉴固结理论的思想，提出无量纲化的交圈因数，利用成长函数曲线较好地拟合不同冻结管间距和冷媒温度条件下的交圈因数–渗流速度曲线。在此基础上，建立渗流条件下人工冻结交圈时间计算方法。研究成果可为渗流地层中人工冻结施工设计及计算提供借鉴和参考。

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	孙立强1
	商安策1
	郎瑞卿2
	苗雨3

关键词 ：数值分析, 冻结壁, 冻结管间距, 冷媒温度, 临界渗流速度, 交圈时间

Abstract：To solve the problem that there is no calculation method for the design of artificial freezing wall in seepage stratum in the relevant design codes，the coupled temperature field-seepage field calculation of seepage strata was realized by using COMSOL Multiphysics finite element software. The calculation results were verified by indoor tests. The development law of the temperature field with the change of seepage velocity，freezing pipe spacing and refrigerant temperature is studied by numerical calculation. The results show that when the groundwater seepage velocity is greater than the critical velocity，the freezing wall does not cross-loop and there is a good linear relationship between the critical velocity and the freezing temperature gradient. The calculation method of the critical velocity is proposed. Referring to consolidation theory，a dimensionless closure factor is proposed. The closure factor - seepage velocity curve under different freezing pipe spacing and refrigerant temperature conditions is well fitted by using the growth function curve. On this basis，the calculation method of artificial freezing closure time under seepage conditions is established. The research results can provide reference for the design and calculation of artificial freezing construction in seepage stratum.

Key words： numerical analysis freezing wall freezing pipe spacing refrigerant temperature critical velocity closure time

引用本文:

孙立强1，商安策1，郎瑞卿2，苗雨3. 渗流地层人工冻结壁交圈时间计算方法[J]. 岩石力学与工程学报, 2023, 42(S1): 3663-3673.
SUN Liqiang1，SHANG Ance1，LANG Ruiqing2，MIAO Yu3. Calculation method of artificial freezing wall closure time in seepage stratum. , 2023, 42(S1): 3663-3673.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0545 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3663

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