1. College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu, PR China
2. Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education of China, Lanzhou University, Lanzhou, Gansu, PR China
3. Cultural Heritage Bureau of Gansu Province, Key Scientific Research Base of Basic Science of Rock-Earthen Relics Protection and Talents Cultivation (Lanzhou University), Lanzhou, Gansu, PR China
4. National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites, Dunhuang Academy, Dunhuang, Gansu, PR China