1. U.S. Army Corp of Engineers, Engineer Research and Development Center, Geotechnical and Structures Laboratory, CEERD-GS-S, 3909 Halls Ferry Rd., Vicksburg, MS 39180 (corresponding author).
2. U.S. Army Corps of Engineers, Engineer Research and Development Center, USACE Reachback Operations Center, Mobile, AL 36602.
3. U.S. Army Corp of Engineers, Engineer Research and Development Center, Geotechnical and Structures Laboratory, Vicksburg, MS 39180.