Settlement Characteristic of Warm Permafrost Embankment with Two-Phase Closed Thermosyphons in Daxing’anling Mountains Region

The Xing’anling Mountains are the second largest permafrost region in China. One of important issues for highways these regions is how to control settlement during operation period meet demand road stability. This paper selects a typical embankment Daxing’anling region, presents finite element models embankment, and verifies it using field monitoring data study thermal deformation characteristics within 50 years after construction. Calculation results illustrate that under has degraded significantly highway led serious settlement. To prevent degradation permafrost, series with two-phase closed thermosyphons (TPCTs) were established analyze cooling effect. contribution different factors, including install locations, depth, shapes TPCTs, assessed on their effects reducing Results show TPCTs have an excellent effect embankment. However, as change temperature distribution they will inevitably cause differential In order ensure reduce suggested L-shaped should be adopted remedial engineering.