Abstract: This study presents an investigation into the numerical simulation of the behavior of a compacted Boom clay under various loading paths. It is studied in particular the swelling pressure during the wetting path and the peak observed in the test performed at a low density as a consequence of the plastification of the sample at constant volume. A comparison of blind prediction and experimental results is made by using a highly swelling elastoplastic numerical model. This comparison has showed the ability of the model to correctly predict the complex trend of behavior during the swelling pressure test.