1. Associate Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Jiangsu, Xuzhou 221116, China; Visiting Scholar, Dept. of Civil and Architectural Engineering and Mechanics, Aerospace and Mechanical Engineering, Univ. of Arizona, Tucson, AZ 85721 (corresponding author).
2. Professor, Dept. of Civil Engineering and Engineering Mechanics, Univ. of Arizona, Tucson, AZ 85721; Professor, Aerospace and Mechanical Engineering, Univ. of Arizona, Tucson, AZ 85721.