Застосування розрахункової схеми умовного фундаменту для паль великої довжини

Abstract

In this master's qualification work the task was set to improve the use of the method of the conditional foundation for determining the settling of piles of long length. A comparison had been made of sedimentation of drill piles of different lengths, determined on the basis of the calculated scheme of the conditional foundation with the actual values of sediment determined during field trials. For analysis, the results of tests of drill piles in different soils are selected. The factors that influence the difference between theoretical and experimental results are analyzed. The obtained results allowed to make recommendations on the improvement of the calculation scheme of the conditional foundation during calculations of settling of piles of long length. On the example of a multistory building on pile foundations there was performed a mathematical modeling of the interaction of the stress-deformed state of elements of the base-foundation-structure system with the use of determining the coefficients of the stiffness of the basis of the conditional foundation method in the formulation of the norms recommendations. For the same construction, the simulation of the interaction of the stress-deformed state of the elements of the base-foundation-structure system with the use of the recommendations obtained during the study was performed. Application of research results allowed to obtain an economic effect by reducing the number of piles. In the technical part of the master's qualification work the design of a 25-storey residential building with an accomplishment of the adjoining territory was carried out. The house has a built-in office and office space. The projected house is single-sectional, with a height of 25 floors. According to the design scheme, the house is classified as monolithic frame. The main supporting elements of such a system are concrete monolithic pylons, the walls of the step-lifting unit and the diaphragm of stiffness in the thickness of 200 and 300 mm. These elements are supported by flat reinforced concrete slabs of overlappings and coatings. The foundation of the building is a monolithic slab of razverk on ferro-concrete drill piles. In the economic part an effective decision of foundations with the use of research results is developed.