ZHOU Wei 1,2,YAN Yan 1,2,ZENG Yun-ying 3,ZHONG Xiang-hao 1 1. Institute of Mountain Hazards and Environment,Chinese Academy of Sciences and Ministry of Water Conservancy,Chengdu 610041,Sichuan,China; 2. Department of Civil Engineering,Jiujiang College,Jiujiang 332005,Jiangxi,China; 3. Graduated School of the Chinese Academy of Sciences,Beijing 100039,China