Analysis On Frost-heaving And Thawing-settlement Of Ha-qi Passenge Dedicated Line By Means Of Field Monitoring.

Frost heaving and thaw, mud pumping and other damages of subgrade bed in seasonal frozen ground region take place frequently and seriously influenced the safety of railways. In recent years, as the building and opening of the first high speed railway Harbin-Dalian line, other high speed railway projects like Harbin-Qiqihar, Harbin-Jiamusi and Harbin-Mudanjiang line started construction in succession. Because high speed railways runs fast, especially ballastless track have higher requires for embankment deformation and stability, the field monitoring for frost-heaving deformation as well as the exploring of the change rules varied with seasons become quite important.The paper focused on the passenger railway line(Harbin-Qiqihar line) in deep seasonal frozen ground region, selected typical roadbed testing segment to have long-term monitoring of ground temperature and frost heaving, and get three compete cycle test data. According to the analysis of this data, the paper mainly get the following results.1.Through the analysis of ground temperature of every section in three period. The change rule of temperature field of roadbed is obtained in this paper.2.Through the comparison for the temperature variation rule between deep roadbeds and natural clay, the paper verified the influence of anti-frost stuffing and thermal insulation berm to the internal temperature field of roadbed.3.Through the analysis of settlement data of every section in different point position, found that in the end of every March, especially when the temperature of roadbed is close to the freezing temperature of stuffing, there will be a temperature sensitive period, and the number of frost heaving will increase dramatically, frost heaving steps will appear which last for almost one week, there have big impact for operational safety...