高海拔严寒地区特长公路隧道保温层铺设长度

Laying Length of Thermal Insulation Layer of Super Long Highway Tunnel in High Altitude and Severe Cold Area

我国西北地区规划地修建的隧道在西北高海拔、严寒地区越来越常见,并且规模越来越大,长度也逐渐增加。在高海拔和严寒地区对隧道洞口段采用合理的保温措施达到保温的目的,是隧道防冻设计的决定性方向。现深入分析长隧道和特长隧道的纵向温度分布规律和分段防冻数值,得出保温层合理的铺设长度和厚度,为后期的隧道施工提供可靠的技术支撑。

Tunnels planned for construction in the northwestern region of China are becoming more and more common in the high-altitude and severe cold areas of the northwest,and the scale is getting larger and the length is gradually increasing.In high-altitude and severe cold areas,reasonable thermal insulation measures are used for tunnel entrance section to achieve the purpose of thermal insulation,which is decisive direction of the tunnel antifreeze design.The longitudinal temperature distribution law and segmented antifreezing value of long tunnels and super-long tunnels are deeply analyzed,and a reasonable laying length and thickness of the insulation layer is obtained,which could provide reliable technical support for later tunnel construction.