1. School of Civil Engineering, Central South University, Changsha 410075, China
2. National Engineering Research Center of High-speed Railway Construction Technology, Changsha 410075, China
3. Jiangsu Shuanglong Group Co., LTD, Nanjing 211112, China
4. College of Civil Engineering, Hunan University, Changsha 410082, China
5. School of Geosciences and Info-physics, Central South University, Changsha 410083, China