玉希莫勒盖隧道温度场及保温层厚度的研究

发布时间：2018-02-22 07:29

  本文关键词： 季节性寒区隧道 温度场 现场监测 冻结锋面 保温层　出处：《现代隧道技术》2016年05期 　论文类型：期刊论文

【摘要】：新疆G217国道玉希莫勒盖隧道位于高海拔季节性冻土地区,为确保隧道运营的安全性,需对其温度场及保温层厚度进行研究。针对这一问题,文章首先采用自动温度监测仪对该隧道进行现场观测,得到隧道不同径向深度处的温度变化规律;通过室内试验测定相关计算参数,并根据现场温度监测的拟合分析结果确定模型边界条件,将该隧道未铺设保温层时的温度场计算结果与现场温度监测结果进行对比,可以看出两者变化趋势基本吻合;然后进一步分析现场采用5 cm保温层的可靠性,计算结果表明,在衬砌壁后仍存在0.4m的冻结范围;同时分析了冻结锋面的扩展规律,得出拱肩和底板是冻结锋面扩展速度最快、距离最远的部位,视为整个断面的危险位置;最后以拱肩和底板处衬砌外侧的温度是否为0℃作为判据计算了该隧道所需保温层厚度。文章研究成果对高山季节性寒区隧道的建设具有一定的指导意义。
[Abstract]:In order to ensure the safety of the tunnel, it is necessary to study the temperature field and the thickness of the insulation layer in order to ensure the safety of the tunnel. In this paper, the temperature variation of the tunnel at different radial depths is obtained by using the automatic temperature monitor, and the relevant calculation parameters are measured by indoor test. The boundary conditions of the model are determined according to the fitting and analyzing results of field temperature monitoring. The calculated results of temperature field of the tunnel without insulation layer are compared with the results of field temperature monitoring, and it can be seen that the variation trend of the two models is basically consistent. Then, the reliability of the 5 cm insulation layer is further analyzed. The calculation results show that there is still a freezing range of 0.4 m behind the lining wall, and the expansion law of the freezing front is analyzed at the same time, it is concluded that the arch shoulder and the bottom plate are the fastest expansion speed of the frozen front. The farthest part is regarded as the dangerous position of the whole section; Finally, the thickness of insulation layer of the tunnel is calculated according to whether the temperature outside the lining outside the arch shoulder and the bottom plate is 0 鈩，

本文编号：1523865