With the increasing impacts of climate change globally, extreme weather events and global warming are becoming more prevalent, highlighting the growing importance of unsaturated soil mechanics. Current foundation design assumes dry or saturated soil conditions due to limited tools for modelling unsaturated soils. However, it is essential to account for future extreme events like drying and wetting cycles to ensure infrastructure resilience. This paper explores the numerical modelling of pile behaviour in unsaturated Pearl clay under varying initial conditions during the infiltration process. The analysis employs the NUMGEO finite element modelling program, a multiphase tool designed for simulating geotechnical processes with hydro-mechanical coupling. An enhanced hydro-mechanically coupled hypoplastic constitutive model developed by authors for unsaturated soils, implemented in NUMGEO, is used in the numerical simulations. The results indicate that initial soil suction and the over-consolidation ratio significantly influence the settlement behaviour of pile foundations during infiltration.