1. State Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, China
2. School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
3. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
4. School of Construction Engineering, Jilin University, Changchun 130021, China
5. Lanzhou West Maintenance Section, China Railway Lanzhou Group Co., Ltd., Lanzhou 730030, China