1. 3) Tsuchida, T.：Evaluation of undrained shear strength of soft clay with consideration of sample quality, Soils and Foundations, Vol. 40, No. 3, p. 29-42, 2000.
2. 4) Ladd, C. C., De Groot, D. J. : Recommended practice for soft ground site characterization, Arthur Casagrande Lecture, 12th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, Massachusetts Institute of Technology, Cambridge, 2003.
3. 5) Bjerrum, L. : Problems of soil mechanics and construction on soft clays and structurally unstable soils, State of the Art Report, Proc., 8th ICSMFE, Moscow, Vol. 3, pp. 111-159, 1973.
4. 6) Hanzawa, H. : Field and laboratory behavior of KhorAl-Zubair clay, Iraq, Soils and Foundations, Vol. 17, No. 4, pp. 17-30, 1977.
5. Quality evaluation of undisturbed sample taken from seabed in Tokyo Bay based on various strength tests