The article describes the design process and the construction of a work on one of the most important investments realized recently, i.e. the expansion of Opole power plant. The project consists of soil reinforcement under slab foundation for a turbo generator in new blocks number 5 and 6. The strengthening was realized using concrete columns. The project of the reinforcement was an important part of the preparations for the realization of the works. It was decided to construct a three-dimensional model of soil with the elements of the reinforcement. Non-linear material models, such as Hardening Soil for soils and Hoek-Brown for rock formations, were applied in the calculations. Geotechnical parameters and the design solution (the prevision of foundation slabs excessive settlements) were calibrated during trial loading of test columns. 1020 reinforced columns CFA and 2057 CMC columns were built during the construction.

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