ZHU Zhi-hui1,2, WANG Li-dong1, GONG Wei1, YU Zhi-wu1,2, CAI Cheng-biao3
(1. School of Civil Engineering, Central South Univ, Changsha, Hunan410075, China;2. National Engineering Laboratory for High Speed Railway Construction, Central South Univ, Changsha, Hunan410075, China;3. State Key Laboratory of Traction Power, Southwest Jiaotong Univ, Chengdu, Sichuan610031, China)