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Climate change and engineering activities are the leading causes of permafrost temperature increase,active layer thickening,and ground-ice thaw,which trigger changes in the engineering stability of embankments.Based on the important research advances on permafrost changes and frozen soil engineering in Qinghai-Xizang Plateau,the changes in permafrost temperature and active layer thickness,their relationships with climate factors,the response process of engineering activities on permafrost,dynamic change of engineering stability of Qinghai-Xizang Railway,and the cooling mechanism and process of crushed-rock layers are discussed using the monitoring data of permafrost and embankment deformation.Finally,solutions to the key scientific problems of frozen soil engineering under climate change are proposed.
Climate change and engineering activities are the leading causes of permafrost temperature increase, active layer thickening, and ground-ice thaw, which trigger changes in the engineering stability of embankments. Based on the important research advances on permafrost changes and frozen soil engineering in Qinghai- Xizang Plateau, the changes in permafrost temperature and active layer thickness, their relationships with climate factors, the response process of engineering activities on permafrost, dynamic change of engineering stability of Qinghai-Xizang Railway, and the cooling mechanism and process of crushed-rock layers are discussed using the monitoring data of permafrost and embankment deformation. Finally, solutions to the key scientific problems of frozen soil engineering under climate change are proposed.