1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. College of Civil Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China; 3. National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China; 4. College of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China