1. School of Qilu Transportation, Shandong Univ., Jinan 250061, China; School of Transportation, Southeast Univ., Nanjing, China.
2. Director, Shandong Hi-Speed Group Co., Ltd., No. 8, Longao North Rd., Lixia District, Jinan, Shandong 250000, China.
3. Graduate Student, School of Qilu Transportation, Shandong Univ., Jinan 250061, China.
4. Assistant Professor, School of Qilu Transportation, Shandong Univ., Jinan 250061, China (corresponding author). ORCID: .
5. School of Qilu Transportation, Shandong Univ., Jinan 250061, China.
6. Professor, School of Qilu Transportation, Shandong Univ., Jinan 250061, China.