Progress and Prospects of Cold Protection and Anti-Freezing Technologies for Tunnels in High-Altitude Cold Regions
With the continuous deepening of China's Western Development Strategy,the steady advancement of the Belt and Road Initiative,and the deployment and implementation of the major strategy of the Country with Strong Transportation Network,the number of tunnels constructed and operated in high-altitude cold regions is increasing year by year.In recent years,although significant progress has been made in the construction technology of tunnels in cold regions,especially in terms of cold protection and anti-freezing technologies,the occurrence rate of freeze damage remains still high.Affected by severe cold and complex meteorological conditions,phenomena such as ice hanging inside tunnels,ice overflow from side ditches,road surface icing,lining cracking,and drainage system freezing-induced failure occur from time to time,severely affecting the safety and durability of the lining structure and causing huge economic losses.The construction and operation of tunnels in cold regions face severe challenges.This paper summarizes the current application status of key technologies for cold protection and anti-freezing of tun-nels in highaltitude cold regions,focusing on the determination of insulation layer thickness and defense length pa-rameters,insulation forms and applicability,water-proof and drainage technology,calculation of surrounding rock frost heaving force,and anti-freezing technology for lining structures.It highlights the issues that still need attention and resolution in the construction and operation of tunnels in cold regions and looks forward to the development di-rection of cold protection and anti-freezing technologies for tunnels in high-altitude cold region,aiming to provide references for the successful construction and safe operation of such tunnels.
Tunnels in cold regionsInsulation layerDefense lengthWater-proof and drainageFrost heave forceAnti-freezing structureDurability
NETL
NSTL
万方数据
