当采用垂直冻结工法作为盾构隧道端头地层加固方式时，确定冻结管间距及加固所需范围与工艺、掌握冻土帷幕温度场发展与分布规律等是需要解决的关键问题。结合南京地铁10号线过江隧道盾构始发工程，运用有限元分析软件，在其他影响因素不变的情况下，研究不同冻结管间距对垂直冻结壁温度场发展的影响。数值分析表明： 1）用所建数值模型来模拟垂直冻结壁温度场的变化过程是可行的； 2）间距减小对温度场影响较为显著，冻结管间距每增大0.1 m，冻结壁交圈时间增加约1 d； 3）随着冻结管间距的增大，冻结壁交圈时间线性增大； 4）冻结管间距越小，垂直冻结帷幕温度越低，形成的垂直冻结壁强度越均匀。

Determining the freezing pipe spacing, the freezing reinforcement scope and freezing reinforcement techniques, and acquiring the development and distribution patterns of the temperature field of the frozen soil walls are key issues that need to be addressed when the soil of shield launching shafts is reinforced by vertical freezing method. In the paper, the influence of different freezing pipe spacing on the development of the temperature field of the vertical frozen wall is studied by means of finite element analysis software and on basis of the shield launching project of the crossriver shield tunnel on Line 10 of Nanjing Metro. The numerical simulation shows that: 1) It is feasible to simulate the temperature field of the vertical frozen wall by means of the numerical model established; 2) Decreasing the freezing pipe spacing has obvious influence on the temperature field; Every time when the freezing pipe spacing increases 0.1m, the crosslap time of the frozen wall increases about 1 day; 3) With the increasing of the freezing pipe spacing, the crosslap time of the frozen wall increases linearly; 4) The smaller the freezing pipe spacing, the lower the temperature of the frozen wall, and the more uniform the strength of the frozen wall. 