上海长江隧道联络通道冻土帷幕温度场动态演化机理分析

Dynamic evolution analysis on Frozen Wall Temperature of Cross Passage in Shanghai Yangtze River Tunnel

摘要:

研究了上海长江隧道联络通道冻土帷幕温度动态演化过程。运用有限元ANSYS建立较为符合实际工程的三维实体模型，考虑了管片散热、冷排管等影响，用比焓值随温度的变化来反应相变潜热的动态变化过程。本文研究和总结了冻土帷幕温度动态演化机理，包括冻土帷幕发展规律、交圈规律、平均温度发展规律及冻土帷幕有效厚度发展规律。研究结果表明，冻土帷幕温度场的形成是一个有规律可循的连续性发展过程。有限元分析的冻土帷幕交圈时间、平均温度和冻土帷幕有效厚度与工程实测数据比较吻合。论文成果可供同类工程参考。

Abstract:

The dynamic evolution process of frozen wall temperature in Tunnel Construction of Shanghai Yangtze is studied by finite element method. Considering the effect of heat radiation of tunnel lining and refrigerate battery, a three- dimensional solid element modal is built to simulate the construction process, in which latent heat of phase change is indicated by way of Enthalpy application. The law of frozen wall development, frozen wall closure, average temperature and effective thickness is summarized in this paper. Research demonstrates that the process of froze wall forming is successive and has some rules to follow. The time of frozen wall closure, average temperature and thickness agrees well with the on-site test data, which validates the numerical results. The result is of value to similar projects.