1. Professor, School of Highway, Chang’an Univ., Xi’an 710064, China (corresponding author).
2. Ph.D. Candidate, School of Highway, Chang’an Univ., Xi’an 710064, China.
3. Xi’an Highway Research Institute Co., Ltd, Xi’an 710061, China.
4. School of Architecture & Civil Engineering, Xi’an Univ. of Science & Technology, Xi’an 710054, China.
5. Associate Professor, School of Highway, Chang’an Univ., Xi’an 710064, China.