I have some laboratory test of Pescara sand and I’m trying to find the von Wolffersdorff parameters of this sand. So I have used ExCalibre with the data stored in the file labProtocol_S4C4.xlsx in this repository ( https://1drv.ms/f/s!AietkfmULY9CkeZL4VzKstrSmSxCmQ) . The curve of response are very good except in the prediction of volumetric strain. I’m not sure whether the parameters that ExCalibre suggest are good. I also have some doubts as to why the curve of response of triaxial drained test start in a different void ratio that I have specify in excel file. Is it possible that the initial void ratio specified in the OED-REC-1 B2 is not used in calculation ?