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在冻结法施工中,冻土帷幕的三维温度场预测是一个重要内容。首先对土冻结过程中的热传递现象进行了定性分析,然后通过相关资料演绎了冻土温度场的理论计算公式和热物理参数公式,最后应用有限元软件ABAQUS并结合模型槽冻结实验,在考虑相变潜热的基础上,建立了1根水平冻结管、2根水平冻结管、3根冻结管(2根水平冻结管+1根倾斜冻结管)的三维温度场模型。通过对不同模型三维温度场的比较,得到了冻结管数量、布置方式对冻土帷幕的形成速度和范围的影响。通过与相关测点测试数据的比对,建立了土体温度随时间的变化曲线,揭示了土体在人工冻结过程中的三维温度场发展变化规律。
In freezing construction, prediction of the three-dimensional temperature field of frozen soil curtain is an important content. Firstly, qualitative analysis of heat transfer phenomenon in soil freezing process was carried out. Then, the theoretical calculation formula and thermophysical parameter formula of temperature field in frozen soil were deduced from relevant data. Finally, finite element software ABAQUS and model tank freezing experiment were used. Based on the latent heat of phase transformation, a three-dimensional temperature field model of one horizontal freezing tube, two horizontal freezing tubes and three freezing tubes (two horizontal freezing tubes and one inclined freezing tube) was established. Through the comparison of the three-dimensional temperature field of different models, the influence of the number and arrangement of frozen pipes on the formation speed and range of frozen soil curtain is obtained. Through the comparison with the test data of relevant measuring points, the curve of soil temperature with time is established, and the rule of the development and change of three-dimensional temperature field of artificial soil is revealed.