Problem Analysis of High Grade Highway Construction in Permafrost Regions

The countermeasures for some possible problems which may arise in the construction of highway or in the application of some typical engineering measures in permafrost regions are analyzed,within the context of high grade highway construction and development in China.Previous research results found the essential difference of heat source,heat-transfer process,and heat-transfer intensity between railway and highway or high grade highway existing.So,it is predictable that scientific research achievements acquired to Qinghai-Tibet Railway can not come up to the requirements of high grade highway construction.At the same time,more severe challenge in the construction and security operations of high grade highway in permafrost regions would be faced,due to stronger heat-absorption,heat-collection of high grade highway and higher road construction standards,which also come up with higher standard of the validity of embankment temperature-regulated measures.The experimental results and observed data of embankment temperature-regulated measures in convection,conduction and radiation indicated that problems may be solved by development,improvement or combination of engineering measures based upon thermal characteristics of high grade highway,besides,the improved way of the construction measures also be discussed.Those discussion and research results will make an available effect for research and design of high grade highway in permafrost regions.