Experimental study on frost heave of high-speed railway subgrade in the seasonally frozen region

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  • Yang Guo-tao
    School of civil engineering, Beijing Jiaotong University,China Railway Corporation
  • Yan Hong-ye
    Railway Engineering Research Institute, China Academy of Rails Science
  • Cai De-gou
    Railway Engineering Research Institute, China Academy of Rails Science
  • Zhao Guo-tang
    China Railway Corporation
  • Yao Jian-ping
    Railway Engineering Research Institute, China Academy of Rails Science
  • Chen Feng
    Railway Engineering Research Institute, China Academy of Rails Science

抄録

Most of seasonally frozen regions are widely distributed in the northern part of China; a lot of high-speed railways have been built in these regions. Due to the seasonally frost Most of seasonally frozen regions are widely distributed in the northern part of China; a lot of high-speed railways have been built in these regions. Due to the seasonally frost heave and thaw settlement phenomena in the subgrade, the irregularity problem of railway lines will occur; this will become a great challenge to the strict control standard of Chinese high-speed railway. Based on the state detection of high-speed railway track and the in-situ monitoring of subgrade frost heave deformation condition in 2012-2013 and 2013-2014 periods, the typically rules of frost heave and thaw settlement in high-speed railway subgrade in the seasonally frozen region have been found out. Take a high-speed railway in the seasonally frozen region as an example, the frost depth of subgrade can be divided into two stages, the steadily rapid development stage and the two-direction thaw stage. The relationship between the in-situ detected engineering frost depth and the latitude,the frozen index and the naturally frost depth have been achieved. The amount of subgrade frost heave in winter is relatively low, and the distributed area is relatively narrow. The whole process of frost heave can be divided into five typically stages: the initially fluctuation stage, the rapidly developed stage, the gently developed stage, the fluctuated thaw settlement stage and the thaw settlement deformation stage. The spatio-temporal changing laws of frost heave deformation in each stage and the relationship to the foundation structure, the characteristics of filling material and the moisture condition have been pointed out. The frozen-thaw features of high-speed railway subgrade and the comparison results between two winter periods have provided important technology support to the construction, the operation and the maintenance of high-speed railway in the severely cold region.

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