1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
2. Qingdao Metro Line 1 Co., Ltd., Qingdao 266045, China
3. Engineering Bureau Co., Ltd., China State Construction, Changsha 410007, China
4. The Fifth Engineering Co., Ltd., China Railway 25th Bureau Group, Qingdao 266101, China
5. Tunnel Engineering Co., Ltd., China Communications Construction, Beijing 100024, China