[1] Biomechanical Eng. Inst, Sichuan Univ, Chengdu 610065, China
[2] State Key Lab. of Geohazard Prevention and Geoenvironment Protection, Chengdu Univ. of Technol, Chengdu 610059, China
[3] Strength Room, AVIC Chengdu Aircraft Design and Research Inst, Chengdu 610041, China
[4] Dept. of Bioengineering, Beihang Univ, Beijing 100083, China