Analysis of long-term stability of subgrade with different structures of the Qinghai-Tibet Railway in permafrost regions
In the warm and ice-rich permafrost regions,the permafrost warming caused by climate warming has caused the obvious deformation settlement of some subgrade sections of the Qinghai-Tibet Railway.In order to understand the stability change process of subgrade with different structure under the climate warming,this study analyzes the traditional subgrade,U-shaped crushed-rock subgrade and crushed-rock revetment subgrade.Based on the analysis of the monitoring data of ground temperature and deformation from 2006 to 2018,the relation-ship between ground temperature and deformation of these three type subgrades is discussed.The results show that the ground temperature stability of U-shaped crushed-rock subgrade is the best among the three sections,and the ground temperature stability of shallow subgrade with crushed-rock revetment is better than that of traditional subgrade,but the ground temperature stability of deep permafrost is poor.The analysis of deformation monitoring data shows that the deformation stability of three subgrade from high to low is U-shaped crushed-rock subgrade,crushed-rock revetment subgrade and traditional subgrade.In addition,through the analysis of ice content and ground temperature data,it is found that controlling the warming and melting of shallow permafrost is more effective than the deep to reduce the deformation of subgrade.
subgrade of the Qinghai-Tibet Railwaypermafrostground temperaturedeformationice content
万方数据
维普
