1. PhD, Dept. of Civil Engineering, National Chiao Tung Univ., 1001 Ta Hsueh Rd., Hsinchu Taiwan 300, R.O.C.
2. Associate Professor, Dept. of Civil Engineering, National Chiao Tung Univ., 1001 Ta Hsueh Rd., Hsinchu Taiwan 300, R.O.C. (corresponding author). E-mail: slhung@cc.nctu.edu.tw
3. Researcher, Geotechnical Researcher Center, Sinotech Engineering Consultants, Inc., Basement No. 7, Ln. 26, Yat-Sen Rd., Taipei Taiwan 105, R.O.C.
4. Manager, Geotechnical Researcher Center, Sinotech Engineering Consultants, Inc., Basement No. 7, Ln. 26, Yat-Sen Rd., Taipei Taiwan 105, R.O.C.