Analytical solution to steady-state temperature field of two freezing pipes with different temperatures

The existing analytical formulas to calculate the temperature field distribution of artificial frozen soil walls are all based on the conditions that the surface temperatures of all freezing pipes are equivalent. In this paper, analytical solution of steady state temperature field of two freezing pipes with different temperatures is deduced based on thermal potential superposition method. The correctness of the analytical formulas is verified by comparing the temperature field distributions of the analytical formulas and those of the numerical simulations in the same conditions. And discussions are made to analyze the influence of some parameters on temperature field distribution of this condition.     

基于CATIA软件的楔形盾构隧道管片参数化建模与排版

为提高楔形盾构隧道管片拼装拟合设计效率,基于达索CATIA V6软件平台,分析管片几何结构模型建模与隧道设计曲线拟合原理。通过盾构管片参数换算,建立楔形盾构隧道管片环参数化建模标准库,设计函数运算关系并编辑脚本,然后以局部坐标系转换的方式实现隧道曲线参数化拟合,编写排版拟合程序,并应用排版程序分析不同楔形量对通用楔形盾构管片隧道曲线拟合精度的影响。最后,依托杭州市艮山快速路下沙段提升改造工程,对工程初设中直径为14 m的盾构管片进行建模排版模拟,结果表明排版程序计算结果满足工程需求,能为实际工程提供一定依据。