Modelling of the sedimentation and consolidation processes requires specialized software and unified theories. This paper discusses the numerical modeling of coupled sedimentation and large strain consolidation. Using the two-phase flow theory, it is possible to unify the theories of sedimentation and consolidation with consistent variables and coordinates, and the one-dimensional unified governing equation can be extended to a three-dimensional formulation. Four benchmarks were evaluated. These benchmarks included the Sidere Benchmark, originally derived by Bartholomeeusen et al. and the Townsend benchmarks for scenario A, B, and D. Townsend A was solved as a 2D and 3D column to show that the multidimensional formulation demonstrates consistent results.