Elastoplastic model for unsaturated, quasi-saturated and fully saturated fine soils Ba Tien Lai, Antonin Fabbri, Henry Wong, Tuan Anh Bui and Denis Branque E3S Web Conf., 9 (2016) 08016 Published online: 12 September 2016 DOI: 10.1051/e3sconf/20160908016