我国正在建设中的青藏铁路,是党中央、国务院西部大开发战略的标志性工程。由于要穿越海拔4500米以上的550多公里的地质条件复杂的多年冻土区,这项工程将成为人类挑战极端自然条件的雄伟壮举。冻土是指温度低于零度并含有冰的各类土壤,多年冻土是指冻结状态持续多年不融化的冻 The Qinghai-Tibet Railway under construction in our country is a landmark project of the strategy of developing the western part of the Party Central Committee and the State Council. Due to the more than 550 km of geologically complicated permafrost above 4,500 meters above sea level, the project will be a majesty of humankind for challenging extreme natural conditions. Frozen soil refers to the temperature below zero and contains various types of soil, permafrost refers to the frozen state for many years does not melt the frozen