1. Associate Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136 (corresponding author).
2. Professor, Dept. of Geotechnical Engineering and Geosciences, Univ. Politecnica de Catalunya, Barcelona 08034, Spain.
3. Senior Researcher, CIEMAT, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid 28040, Spain.