1. Department of Geotechnical Engineering, Tongji University, Shanghai, China
2. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guangxi, China
3. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW, Australia
4. Department of Civil and Environmental Engineering, Case Western Reserve University, Cleveland, OH, USA