1. Ph.D. Student, School of Highway, Chang’an Univ., Xi’an, Shaanxi 710064, PR China.
2. Professor, School of Highway, Chang’an Univ., Xi’an, Shaanxi 710064, PR China; Professor, Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an Univ., Xi’an, Shaanxi 710064, PR China (corresponding author).
3. Assistant Professor, School of Civil Engineering, Chang’an Univ., Xi’an, Shaanxi 710061, PR China.