Vacuum consolidation can be used to accelerate the soil consolidation in ground improvement projects. Capped Prefabricated vertical drains (CPVDs) is an improved method where vacuum is applied to each PVD separately. This is particularly useful if the area is inundated or have a high permeable sand layer or seam. Vacuum consolidation in an actual project is much challenging to model and predict the performance. This is due to the switching on and off of the vacuum pump, accidental failures of the pump etc. in the field and they need to be incorporated in the analysis. In this paper an elasto-viscoplastic (EVP) model, capable to simulate such instances, is presented and is validated against a field case reported from a land reclamation project in Singapore.