Key Laboratory of Urban Underground Engineering of Ministry of Education;
Beijing Jiaotong University;
Beijing;
China;
Qinghai Research and Observation Base;
Key Laboratory of Highway Construction&Maintenance Technology in Permafrost Regions;
Ministry of Transport;
Xining;
Qinghai;
China;
Fiber bragg grating; Carbon fiber heated sensor; Unsaturated soil; Field monitoring; Soil water content measurement;