1. Lecturer, Institute of Geotechnical and Underground Engineering, Huazhong Univ. of Science and Technology, Wuhan 430074, People’s Republic of China; and, Engineering Faculty, China Univ. of Geosciences, Wuhan 430074, People’s Republic of China.
2. Professor Dr., Institute of Geotechnical and Underground Engineering, Huazhong Univ. of Science and Technology, Wuhan 430074, People’s Republic of China (corresponding author).
3. Associate Professor Dr., Civil, Environmental, and Architectural Engineering Dept., The Univ. of Kansas, KS 66045.