[1
]Ph.D. Student, School of Highway, Chang’an Univ., No. 126, Middle Section of South
Second Ring Rd., Xi’an, Shaanxi 710064, China.
[2
]Engineer, Shandong High-Speed Group Co., Ltd., No. 8, Long’ao North Rd., Jinan, Shandong
250098, China.
[3
]Professor, School of Highway, Chang’an Univ., No. 126, Middle Section of South Second
Ring Rd., Xi’an, Shaanxi 710064, China (corresponding author).