1. School of Qilu Transportation, Shandong Univ., Jinan 250002, Shandong, China.
2. School of Qilu Transportation, Shandong Univ., Jinan 250002, Shandong, China. ORCID: .
3. Professor, School of Qilu Transportation, Shandong Univ., Jinan 250002, Shandong, China (corresponding author). ORCID: .
4. Senior Engineer, China Railway 14th Bureau Group Co., Ltd., Jinan 250101, Shandong, China.