1. Assistant Professor, Dept. of Civil and Environmental Engineering, Tennessee Technological Univ., Box 5015, Cookeville, TN 38505 (corresponding author). ORCID: .
2. Consulting Geotechnical Engineer, 3926 Braden Rd., Walla Walla, WA 99362.
3. Professor, Virginia Tech, 750 Drillfield Dr., Blacksburg, VA 24061.
4. Professor Emeritus, Univ. of Texas at Austin, 301 E. Dean Keeton St., Stop C1700, Austin, TX 78712.