Influenced by global climate warming,the Qinghai-Tibet Plateau has experienced intensifying warm and humid trend,leading to an increase in annual average temperature and precipitation along the railway route.Consequently,the underlying permafrost beneath the railway subgrade has undergone changes.However,previous studies have lacked a comprehensive systematic analysis that integrates climate,permafrost,and subgrade stability along the railway route.To address this gap,utilizing meteorological station data and monitored ground temperature data from permafrost regions along the railway,this study analyzes the variations in temperature and precipitation,the annual average ground temperature and natural upper limit of permafrost,the artificial upper limit of the embankment,and the lateral settlement of the embankment shoulder.The results indicate that over the past two decades,the annual average temperature and precipitation along the railway route have increased in average values of 1.2 ℃ and 80 mm,respectively.Compared to 2007,the annual average ground temperature of the natural permafrost sites along the railway route increased by 0.1 ℃ in 2020.The natural upper limit of permafrost decreased by an average of 0.58 m,while the artificial upper limit of permafrost in the embankment increased by an average of 2.34 m.Moreover,the left embankment shoulder experienced greater settlement compared to the right shoulder,indicating a distinct southern and northern slopes effect.Overall,the permafrost subgrade of the railway remains stable,and in good operating condition,affirming the effectiveness of engineering measures implemented during construction and operation.However,in anticipation of further climate change in the future,it is recommended to proactively plan for new permafrost protection technology.
关键词
高原铁路/气候变化/多年冻土/冻土上限/阴阳坡效应/地温监测
Key words
Plateau railway/Climate change/Permafrost/Permafrost upper limit/Southern and northern slopes effect/Ground temperature monitoring
维普
万方数据