渗流条件下人工冻结模型试验研究

运用相似理论设计了不同的渗流速度，冻结管间距下冻结物理模拟试验，研究不同试验条件下渗流方向温度分布规律、冻结过程中温度场分布特征及冻结壁厚度的变化。研究表明：无渗流时，主面及界面的上下游温度分布具有明显的对称性；而在渗流作用的影响下，上游温度明显高于下游，随着渗流速度增加及冻结管间距变大，这种不对称性也愈加明显，不对称性大大增加；冻结壁交圈时间随渗流速度的增加而增加，但渗流速度过大时冻结壁无法交圈；在渗流条件下，冻结间距增大会导致冻结壁厚度大幅度减小，交圈时间大大延长。

Model Test Research on Artificial Freezing under Seepage Action

Based on the similarity theory, the physical simulation experiments of frozen which considering different seepage velocity and interval of frozen pipes was designed. The temperature distribution law of the seepage direction, the temperature field distribution during the freezing process and the change of the frozen wall thickness were studied under different test conditions. The results show that the upstream and downstream temperature distributions of the main surface and the interface have obvious symmetry under the condition of seepage velocity of 0m/d, and in the influence of seepage, the upstream temperature is obviously higher than that in the downstream. As the seepage velocity increases and the interval of frozen pipes become larger, the asymmetry becomes more and more obvious, the asymmetry is greatly increased. At the same time, the closure time extended with the increase of seepage velocity, but when the seepage velocity was too large, the freezing wall can''t reach the closure stage. In the seepage condition, the increase of the interval between the frozen pipes will result in a significant decrease of the thickness of the freezing wall and the extension of the closure time.