1. State Key Laboratory for Tunnel Engineering, the Institute of Geotechnical and Underground Engineering, and the School of Qilu Transportation, Shandong University, Jinan, China
2. School of Qilu Transportation, Shandong University, Jinan, China
3. State Key Laboratory for Tunnel Engineering, the Institute of Geotechnical and Underground Engineering, and the School of Future Technology, Shandong University, Jinan, China