1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Xiaohongshan 2, Shuiguohu St., Wuhan, Hubei 430071, China (Corresponding author), e-mail: ydong@whrsm.ac.cn, https://orcid.org/0000-0003-1237-0079
2. Department of Civil and Environmental Engineering, Colorado School of Mines, 1600 Illinois St., Golden, CO 80401, USA, https://orcid.org/0000-0003-1753-129X