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1956公里,是世界海拔最高、线路最长的高原铁路,是通往世界屋脊的“天路”。青藏铁路通过多年冻土地段550干米,属中低纬度高海拔多年冻土,具有热稳定性差等特点。建设者在研究试验、勘察设计和施工技术等方面积极探索,确立主动降温、冷却地基、保护冻土的设计思想,创造性地综合采用片石气冷、热棒路基,以桥梁跨越特殊不良冻土地段,防冻胀
1956 km, is the world’s highest altitude, the longest plateau railway line, is leading to the roof of the world The Qinghai-Tibet Railway passes through the permafrost area of 550 dry meters, belonging to the mid-low latitude permafrost at high altitude, with poor thermal stability and other characteristics. The builders actively explored research, survey, design and construction technologies, established the design concept of actively cooling, cooling the ground and protecting the frozen earth, and creatively integrated the use of flake gas-cooled and hot-rod embankment to cross the bridge with special unfavorable frozen land , Frost heaving