1. Faculty of Engineering, China Univ. of Geosciences, Wuhan 430074, China; Disaster Prevention Research Institute (DPRI), Kyoto Univ., Kyoto 6218235, Japan.
2. Professor, Faculty of Engineering, China Univ. of Geosciences, Wuhan 430074, China (corresponding author).
3. China Southwest Geotechnical Investigation and Design Institute Co. Ltd., Chengdu 610052, China.