采控天然冷量过程中青藏铁路路基温度场演变特性研究

Temperature Field Development of the Qinghai-Tibet RailwayEmbankment under the Condition of Gatheringand Controlling Nature Cold Energy

针对青藏铁路工程所穿越的高温、富冰多年冻土路基稳定问题,提出了采控天然冷量,即在冬季采集并存储地气温差所造成的冷量,夏季释放,维护路基稳定的方法.对典型工程条件下采控天然冷量后路基温度场随时间和空间上的演变规律进行了研究比较,结果表明:在不采用附加措施情况下,直到道路施工完成后的第16年路基内温度场才逐渐进入负温,因此必须对路基温度场采用人为干预措施.结果显示,采控天然冷量方法可以保持青藏铁路路基的稳定.

Aimed at the problem of the Qinghai-Tibet Railway embankment stabilization, which goes through the permafrost regions of high-temperature and rich ice, a new method that gathers and controls nature cold energy to keep the frozen soil embankment stabilizing is put forward in this paper. The method gathers the cold energy caused by the temperature difference between air and ground in winter and releases it in summer. Study on the embankment temperature field changing with time and space has been carried out under a typical engineer condition. The result shows that without additional measures, the temperature field in the embankment will not become into negative temperature until the 16th year after the railway construction finished. Thus, to keep the Qinghai-Tibet Railway embankment stabilizing, artificial work must be done to improve the embankment temperature field. This method can effectively keep the Qinghai-Tibet Railway embankment stabilizing.