1. Associate Professor, School of Resource and Civil Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430073, China (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2R3.
3. Professor, School of Civil Engineering and Mechanics, Huazhong Univ. of Science and Technology, Wuhan, Hubei 430074, China.