高海拔严寒地区特长公路隧道保温层铺设长度研究

发布时间：2018-05-03 11:29

本文选题：高海拔严寒地区 + 特长隧道　；参考：《地下空间与工程学报》2017年S1期

【摘要】：随着我国西部大开发的不断深入,在高海拔严寒地区规划和修建的隧道工程越来越多,且隧道长度越来越长。洞口段合理的保温层铺设长度是高海拔严寒地区特长隧道抗冻设计与建设的关键问题。目前,我国对高海拔严寒地区特长隧道纵向温度分布规律尚无系统研究,保温层铺设长度多以经验计算或工程类比为主。以G317线雀儿山隧道为例,参考鹧鸪山隧道竣工通车后洞口段现场实测温度数据变化规律,对雀儿山隧道洞口段保温层铺设长度进行分析。结果表明:确定寒区隧道保温层铺设段长度时,特别是对于特长隧道,应考虑隧道内年平均温度的变化以及温度振幅的衰减;按照鹧鸪山隧道的年平均气温和洞内气温年振幅实测数据变化幅度,考虑1.2的安全系数,建议雀儿山隧洞口保温层铺设长度取为900 m。事实上,保温层铺设长度与隧道曲线形式、隧道长度、海拔高度、地热梯度以及隧道交通量、断面、交通模式、通风模式等诸多因素有关,因此,高海拔严寒地区特长隧道保温层铺设长度有待进一步通过现场实测数据进行对比分析研究。
[Abstract]:With the development of western China, more and more tunnel projects are planned and built in the high altitude cold area, and the tunnel length is getting longer and longer. The reasonable laying length of insulation layer is the key problem in the design and construction of super long tunnel in high altitude cold area. At present, there is no systematic study on the longitudinal temperature distribution of ultra-long tunnels in high altitude cold regions in China, and the laying length of insulation layer is mainly based on empirical calculation or engineering analogy. Taking the Qileshan tunnel of line G317 as an example, the length of insulation layer at the entrance of the tunnel is analyzed with reference to the variation rule of the measured temperature data in the opening section of the tunnel. The results show that the variation of annual average temperature and the attenuation of temperature amplitude should be taken into account when determining the length of the insulation layer of the tunnel in cold region, especially for the extra long tunnel. According to the change range of annual mean air temperature and annual amplitude of air temperature in Fangushan tunnel, considering the safety factor of 1.2, it is suggested that the laying length of insulation layer at the entrance of Qileshan tunnel should be taken as 900 m. In fact, the laying length of insulation layer is related to many factors, such as tunnel curve form, tunnel length, altitude, geothermal gradient and tunnel traffic volume, section, traffic mode, ventilation mode and so on. The laying length of insulation layer of super long tunnel in cold area at high altitude needs to be compared and analyzed through field measured data.
【作者单位】：中铁西南科学研究院有限公司;四川省交通厅公路规划勘察设计研究院;
【基金】：中国中铁股份有限公司科技开发计划项目课题(2012-重大-08) 四川省交通科技项目(12010)
【分类号】：U453

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