Calibration of a double structure constitutive model for unsaturated compacted soils Giulia Ghiadistri, Lidija Zdravković, David M. Potts and Aikaterini Tsiampousi E3S Web Conf., 92 (2019) 15002 Published online: 25 June 2019 DOI: 10.1051/e3sconf/20199215002