F. Oka, A. Yashima, A. Tateishi, Y. Taguchi, S. Yamashita, "A cyclic elastoplastic constitutive model for sand considering a plastic-strain dependence of the shear modulus", Geotechnique, Vol. 49, No. 5, pp. 661-680, 1999. DOI: http://dx.doi.org/10.1680/geot.19126.96.36.1991
F. Oka, "A cyclic elasto-viscoplastic constitutive model for clay based on the non-linear hardening rule", Proc. 4th International Symposium on Numerical Models in Geomechanics, Swansea, Pande, G. N. and Pietruszczak, S. eds., 1, Balkema, pp. 105-114, 1992.
Y. Taguchi, A. Tateishi, F. Oka and A. Yashima, "A Cyclic elasto-plastic model based on the generalized flow rule ant its application", Proc. 5th Int. Symposium on Numerical Models in Geomechanics, Davos, Switzerland, Pande, G. N. and Pietruszczak, S. eds., Balkema, pp. 57-62, 1995.
A. Tateishi, Y. Taguchi, F. Oka and A. Yashima, "An elasto-plastic model for sand and its application under various stress conditions", Proc. of 1st Int. Conference on Earthquake Geotechnical Engineering, Tokyo, Ishihara, K. ed., Balkema, Vol. 1, pp. 399-404, 1995.
F. Oka and H. Washizu, "Constitutive equations for sand and overconsolidated clays", Proc. Int. Conference on Recent Advances in Earthquake Engineering and Soil Dynamics, St. Louis, Prakash, S. ed., 1, pp. 71-74, 1981.
P. J. Armstrong and C. O. Frederick, "A mathematical representation of the multiaxial Bauschinger effect", C. E. G. B. Report RD/B/N, p. 731, 1966.
J. L. Chaboche and G. Rousselier, "On the plastic and viscoplastic constitutive equations Part I and Part II", Journal of Pressure Vessel Technology, Transactions of the ASME, Vol. 105, pp. 153-164, 1983.
F. Oka, "Constitutive equations for granular materials in cyclic loadings", Proc. IUTAM Conference on Deformation and Failure of Granular Materials, Delft, Vermeer, P. A. and Luger, H. J. eds., Balkema, pp. 297-306, 1982.
P. M. Naghdi and J. A. Trapp, "Restrictions on constitutive equations of finitely deformed elasto-plastic materials", Quarterly Journal of Mechanics and Applied Mathematics, Vol. 28, Pt. 1, pp. 25-46, 1975. DOI: http://dx.doi.org/10.1093/qjmam/28.1.25
F. Oka, T. Kodaka, S. Kimoto, Y. S. Kim and N. Yamasaki, "A multi-phase coupled FE analysis using an elasto-viscoplastic model for unsaturated soil", Geomechanics II, Geotechnical Special Publication, ASCE, Proc. 2nd US-Japan workshop on Geomechanics, pp. 124-131, 2006. DOI: http://dx.doi.org/10.1061/40870(216)10
D. Gallipoli, A. Gens, R. Sharma and J. Baunat, "An elasto-plastic model for unsaturated soil incorporating the effects of suction and degree of saturation on mechanical behavior", Geotechnique, Vol. 53, No. 1, pp. 123-135, 2003. DOI: http://dx.doi.org/10.1680/geot.2003.53.1.123
C. Jommi, "Remarks on the constitutive modelling of unsaturated soils, Experimental Evidence and Theoretical Approaches in Unsaturated Soils", Tarantino, A. and Mancuso, C. eds., Balkema, pp. 139-153, 2000.
F. Oka, T. Kodaka, S. Kimoto, R. Kato and S. Sunami, "A hydro-mechanical coupled analysis of an unsaturated river embankment due to seepage flow", Key engineering materials, Trans tech publications, Vol. 340-341, pp. 1223-1230, 2007. DOI: http://dx.doi.org/10.4028/www.scientific.net/KEM. 340-341.1223
F. Oka, S. Kimoto, R. Kato, S. Sunami and T. Kodaka, "A soil-water coupled analysis of the deformation of an unsaturated river embankment due to seepage flow and overflow", Proc. 12th International Conference of International Association for Computer Methods and Advances in Geomechanics (IACMAG), Goa, India, 1-6 October 2008, Singh, D. N. ed., pp. 2029-2041, 2008.
R. Kato, "Development of an unsaturated seepagedeformation coupled simulation method and its application to river embankment", Ph.D. dissertation, Kyoto University, Japan, 2011. (in Japanese)