1. School of Highway, Chang’an University, Xi’an 710064, China
2. China Railway Eryuan Engineering Group Co. Ltd., Chengdu 610031, China
3. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
4. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China