Abstract
The article considers the issues of using maximum of pile length by achieving pile limited equilibrium to satisfy all deformation criteria for the skyscrapers. In case the pile limited equilibrium is achieved while constructing, additional loads will transfer to the surrounding piles. The process can be stopped until the necessary number of piles reaches the limited equilibrium. To determine the real pile behavior in the condition of the limited equilibrium 45 static pile tests under the maximum load 120 000 kN applied in skyscrapers constructing process in Russia were summarized. Tests analysis makes it possible to estimate the value of the limited and residual skin friction for different soil conditions. FEM analysis results show the soil and foundation behavior in the process of piles part reaches the ultimate equilibrium. According to the researches result, the approach to the optimal pile foundation design was made. The sphere of its implementation and practical significance were also considered.
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