Seasonal frozen soil is widely distributed along a High-speed railway.This paper selects 14 natural sites based on their topographical features,soil composition,and hydrogeological conditions.Through continuous monitoring over complete freeze-thaw cycles,crucial data such as the freezing and thawing rates of the subgrade soil,maximum seasonal frost depth,and surface deformation along the route were obtained.By analyzing the freeze-thaw process and surface deformation in snow-covered and exposed sites,combined with factors like temperature,precipitation,and snow thickness,the freeze-thaw characteristics of seasonal frozen soil along the high-speed railway are summarized.The research findings indicate:(1)The maximum freezing depth of natural sites under the snow condition is 19～90 cm,with an average of 45 cm.(2)The freezing rate varies from 0.27 cm/d to 1.20 cm/d,while the thawing rate,generally higher than the freezing rate,ranges from 0.28 cm/d to 1.92 cm/d.(3)Snow cover effectively maintains soil temperature and inhibits soil freezing,significantly shortening the duration of the freezing and thawing processes,resulting in a reduction of the maximum freezing depth by 18%to 24%.(4)The frost heave exhibits an increasing trend from west to east,and its variation pattern aligns with climatic conditions.These research outcomes provide valuable insights for the design of high-speed railways and the prevention of frost damage in similar seasonal frozen soil regions.
维普
万方数据
