1. School of Civil and Resource Engineering, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian District, Beijing 100083, China, http://orcid.org/0000-0002-1387-3666 (Y.Z.), http://orcid.org/0000-0002-2770-2454 (C.C.)
2. Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian District, Beijing 100083, China
3. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Ding No. 11 Xueyuan Rd., Haidian District, Beijing 100083, China (Corresponding author), e-mail: yangrsustb@163.com, http://orcid.org/0000-0002-7062-4033