1. Associate Professor, Dept. of Civil Engineering, Faculty of Civil Engineering and Mechanics, Jiangsu Univ., Zhenjiang 212013, China; Research Scholar, Geological Engineering Program, Univ. of Wisconsin-Madison, Madison, WI 53706.
2. Research Scientist, Geological Engineering Program, Univ. of Wisconsin-Madison, Madison, WI 53706 (corresponding author).
3. Gary and Rosemarie Wendt Professor and Director, Geological Engineering Program, Univ. of Wisconsin-Madison, Madison, WI 53706.
4. Emeritus Professor, Geological Engineering Program, Univ. of Wisconsin-Madison, Madison, WI 53706. E-mail: tbedil@wisc.edu