为探究大直径盾构地中对接时非对称冻结的温度场演变规律，依托江阴靖江长江隧道大直径盾构对接工程，根据相似理论设计进行冻结模型试验，研究盾构外非对称布孔条件下冻结温度场的演变规律和分布特征。主要结论如下： 1）在盾构外部分散布孔冻结作用下，冻结20 d后冻结壁交圈而形成封闭冻结帷幕，冻结70 d和160 d时盾构对接位置冻结壁厚度达到3.9 m和6.0 m，平均温度分别为-13.4 ℃和-14.7 ℃。2）先、后行盾构侧及对接断面的冻土发展速度相差不大，冻结管内部土体体积差别影响不同位置冻结壁厚度和平均温度的变化过程，冻结100 d后内部冻土温度波动较小，整体冻结壁厚度和平均温度进入基本稳定状态。3）盾构钢质壳体的导热作用会促进盾构与土体交界面的冻结效果，减小了盾构轴向上冻结效果的差别，冻结结束时盾壳表面温度达到-17.6 ℃，可有效降低盾壳周围出现地下水渗流的施工风险。4）盾构结构与冻结管布设方式会显著影响冻结壁形成过程及温度场分布特征，通过调整冻结管开孔角度及长度等设计参数，合理分配冻结管内外冻土体积，从而精确控制冻土降温过程，可在盾构对接位置高效获得良好承载能力和封水效果的冻结壁。
To investigate the evolution of the temperature field in asymmetric freezing reinforcement for underground large-diameter shield docking, a freezing model is constructed based on similarity theory to analyze the large-diameter shield docking project of the Jiangyin-Jingjiang Yangtze River Tunnel. The scale model tests show that under the action of externally distributed freezing pipes around the shield, the frozen wall closes to form a sealed freezing curtain after 20 days of freezing. At 70 and 160 days, the thickness of the frozen wall at the docking location reaches 3.9 and 6.0 m, with average temperatures of －13.4 °C and －14.7 °C, respectively. The development rates of the frozen soil on the advance shield side, follow-up shield side, and docking cross-section are similar. The volume of soil inside the freezing pipes affects the progression of the frozen-wall thickness and average temperature. After 100 days of freezing, the temperature change within the inner frozen soil becomes minimal, causing the overall thickness and average temperature of the frozen wall to stabilize. The thermal conductivity of the shield steel shell promotes freezing at the interface between the shield and soil, resulting in comparable freezing effects in both the circumferential and axial directions of the shield. At the end of the freezing process, the temperature on the shield shell surface reaches －17.6 ℃, reducing the risk of groundwater seepage around the shell. The shield structure and the arrangement of freezing pipes significantly affect the formation of the frozen wall and the temperature-field distribution. By optimizing construction parameters such as the drilling angle and the length of the freezing pipes, efficient bearing capacity and effective water-sealing performance can be achieved at the shield-docking location.
