TY - Sciences in Cold and Arid Regions A1 - QingBo Bai, Xu Li, YaHu Tian T1 - A method used to determine the upper thermal boundary of subgrade based on boundary layer theory Y1 - 2015-08-01 JF - Sciences in Cold and Arid Regions JO - Sciences in Cold and Arid Regions SP - 384 EP - 391 VL - 7 IS - 4 UR - http://www.scar.ac.cn N1 - 10.3724/SP.J.1226.2015.00384 ER -