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本文结合苏州地铁玉山公园站-苏州乐园站区间联络通道冻结加固工程,建立三维数值模型对该工程冻土帷幕温度场发展与分布规律展开研究,同时提出优化设计方案并进行对比分析。主要得出:整个联络通道最薄弱的地方是x=-10.7 m处土体,可在该部位打设一小排冻结管来增强冻结效果;路径1、路径3和路径5降温规律相似,即开挖区温度比冻土帷幕区温度高很多,随着时间推移,各个分析点的温度逐渐降低,且离冻结管越近,土体温度越低,其强度越高,越难开挖。路径2和路径4降温规律相似,即各分析点温度基本保持在原始地温18℃左右,随着时间的推移,温度逐渐降低;每隔5 d,曲线之间间距大致相等,降温幅度大致相等,靠上行线隧道端口土体温度较靠下行隧道端口土体温度高。可知沿着X轴方向(即纵向)降温规律相似,沿着Y轴方向(即横向)降温规律相似;采取优化方案将冻结管水平打设,可降低施工难度及节约成本。所得结果可为今后类似工程设计提供技术参考依据。
In this paper, the freezing and reinforcement project of Suzhou Jade Mountain Park Station - Suzhou Paradise Station is established, and a three-dimensional numerical model is established to study the development and distribution of the temperature field of the frozen soil curtain in this project. At the same time, the optimal design scheme is proposed and compared. The main conclusion is that the weakest part of the whole communication channel is the soil at x = -10.7 m, and a small row of frozen tubes can be set up at this part to enhance the freezing effect. The cooling rules of path 1, path 3 and path 5 are similar The temperature of excavation area is much higher than the temperature of curtain area of frozen soil. With the passage of time, the temperature at each analysis point gradually decreases, and the closer to the frozen pipe, the lower the soil temperature, the higher the intensity, the harder it is to excavate. The temperature drop of Path 2 and Path 4 are similar, that is, the temperature of each analysis point is basically maintained at about 18 ℃ of the original ground temperature, and the temperature gradually decreases with the passage of time. The intervals between the curves are approximately the same every 5 days, Soil temperature by the upstream tunnel port is lower than that of the downstream tunnel port. It can be seen that the cooling laws along the X-axis direction (ie, the longitudinal direction) are similar and the cooling laws along the Y-axis direction (ie, the transverse direction) are similar. Optimizing the arrangement of the freezing tubes horizontally can reduce the difficulty and cost of the construction. The results can provide technical reference for similar projects in the future.