1. School of Transportation, Institute of Geotechnical Engineering, Southeast University, Nanjing, China
2. School of Civil Engineering and Mechanics, Lanzhou University, LanZhou, China
3. Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC, USA
4. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China