The symposium, held annually for the past fifteen years, combines presentations from invited speakers and contributions from ZSOIL users and others. It focuses on numerical simulation in geomechanics, constitutive aspects, soil-structure interaction, and associated structural analysis. Engineers and developers interested in accurate numerical simulations or optimizations for complex constructions have the opportunity to exchange experiences and learn about the latest case studies and advancements in numerical simulations. ZSOIL is a user-friendly finite element package for soil, rock, and soil-structure analysis that has been available and used worldwide since its development at Zace Services Ltd.