1. Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education of China: School of Civil Engineering and Mechanics; Lanzhou University; Lanzhou Gansu P. R. China
2. Department of Civil and Environmental Engineering; University of Alberta; Edmonton Alberta Canada
3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection; Chengdu University of Technology; Chengdu P. R. China
4. Department of Geological Engineering, Chang'an University, Xi'an; Shaanxi P. R. China