基于圆形断面的隧道温度场有限差分计算模型

发布时间：2018-06-13 18:09

  本文选题：马蹄形隧道 + 圆形隧道　； 参考：《隧道建设》2016年11期

【摘要】：除了少数圆形隧道外,大部分山岭交通隧道断面采用马蹄形或端墙式等形状。在隧道温度场的预测中,圆形断面模型能否代替马蹄形等实际隧道模型,其适应性值得研究。应用基于空气-衬砌-围岩的对流-导热耦合作用控制方程的有限差分方法,建立圆形断面模型对东北寒区马蹄形隧道温度场进行计算,并与现场实测温度场进行对比。结果表明:1)圆形断面隧道模型有限差分计算方法克服了通用有限元软件建模复杂、对硬件要求高的弊端,考虑了隧道内风流速度和入口风流温度的影响,在隧道温度场的预测计算中能够满足工程使用要求。2)隧道内风流速度和入口风流温度对隧道温度场影响较大。本文算例中,入口风流温度每升高10℃,二次衬砌表面温度升高约7.2℃,增幅均匀;从1~5 m/s,洞内风流速度每增大1 m/s,二次衬砌表面温度降低的幅度为6.6、2.7、1.5、0.9℃,降幅越来越小。
[Abstract]:Apart from a few circular tunnels, most mountain traffic tunnels have horseshoe or end-wall shapes. In the prediction of tunnel temperature field, it is worth studying whether the circular section model can replace the actual tunnel model such as horseshoe. Using the finite difference method based on the governing equation of convection-heat conduction coupling between air lining and surrounding rock the circular section model is established to calculate the temperature field of the horseshoe tunnel in the cold region of Northeast China and the temperature field is compared with the field measured temperature field. The results show that the finite difference calculation method of circular cross section tunnel model overcomes the disadvantages of complex finite element software modeling and high hardware requirement, and considers the influence of air flow velocity and inlet air flow temperature in the tunnel. In the prediction and calculation of tunnel temperature field, the tunnel temperature field is greatly affected by the velocity of air flow in tunnel and the temperature of inlet air flow. In this paper, for every 10 鈩，

本文编号：2014937