1. School of Highway, Chang’an Univ., Xi’an, Shaanxi 710064, China (corresponding author).
2. Professor, School of Highway, Chang’an Univ., Xi’an, Shaanxi 710064, China.
3. School of Highway, Chang’an Univ., Xi’an, Shaanxi 710064, China.
4. School of Civil Engineering and Architecture, Xinjiang Univ., 14 Shengli Rd., Urumqi, Xinjiang 830046, China.