1. School of Traffic and Transportation Engineering, Dalian Jiaotong University, No. 794, Huanghe Rd. Shahekou District, Dalian 116021, China (Corresponding author), e-mail: songyao_1@126.com, https://orcid.org/0000-0002-0649-1782
2. Department of Mechanics and Civil Engineering, China University of Mining and Technology, No. 11, Xueyuan Rd. Haidian District, Beijing 100083, China, https://orcid.org/0000-0003-0954-842X