In order to study the deformation characteristics of embankment with deep permafrost table and degenerative permafrost

based on the permafrost temperature and settlement monitoring data of Qinghai-Tibet Highway

the change process of permafrost table and embankment settlement characteristics were analyzed by analyzing the soil of permafrost

ice content of permafrost

permafrost temperature and embankment settlement deformation data in Xidatan

Tanggula North Slope and Tanggula South Slope. The layered settlement test data monitored from permafrost embankment in Tuotuohe and Qingshuihe area were also analyzed. The results show that the soil and ice content of permafrost have great effect on the degenerative permafrost embankment settlement; while deep permafrost melting has less effect on the embankment settlement. The settlement comes form degenerative permafrost layer and the consolidation of degenerative permafrost layer take a long time to complete in freezing and thawing cycle. In stable road section with permafrost of ice-poor and icy frozen soil

the degenerative embankment settlement rate is 3.9-5.6 mm/a approximately; and the degree of embankment settlement is very small. The embankment settlement has characteristics of persistence and no-slowing with soil of high ice content and powder clay; permafrost embankment deformation shows uniform settlement with less transverse differential settlement.