Petrunyak M. Drilled pile in the soil-cement shell

The object is the combined reinforced concrete drilled piles in soil-cement shell and soil-cement as material; the purpose is the development of design solutions, comprehensive research and study methods of calculating the combined bored piles in the soil-cement shell; the novelty - the design and study in situ combined reinforced concrete bored pile in soil-cement shell; experimentally and theoretically proved that the shell not only protects the wall from the destruction of wells, but also increases the resistance of the piles on the vertical and horizontal load, created a new model of system "combined piles - surrounding soil", using the finite element method studied the stress-strain state of the system and obtained quantitative data on the bearing capacity of bored piles including the soil-cement shell, obtain new experimental data of soil-cement characteristic and defined the depending on the strength of soil-cement from soils lithology, content of cement and additives, the term of its hardening, developed the design method of bored piles including soil-cement shell, the results - developed new construction of the combined drilled pile in soil-cement shell, which differs from the existing one by its reliability and ease of installation in any unstable soils; the model "base - pile" allows to determine the bearing capacity of piles; proved feasibility of using these piles in the retaining walls for a landslide slopes: expanded understanding of the soil-cement physical and mechanical characteristics, their dependence from soils lithology, content of cement and additives, the term of its hardening; the industry is building.