Analysis of existing methods for calculating retaining walls from bored piles
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Abstract
An overview analysis of the methods of calculating retaining walls from driven piles was performed. Analytical calculation of piles in accordance with SNiP 2.02.03–85, calculation taking into account the requirements of change No. 1 DBN V.2.1-10-2009 on the calculation of horizontal stiffness of piles and static calculation of the section using the Lira-CAD software complex were considered, and calculation of a plane cross-section using the finite element method according to the Coulomb-Mohr model in the Plaxis 2D software complex.With population growth and the expansion of cities, the need for new residential, commercial and industrial buildings increases. Modern urbanization leads to an increase in the population density and densification of buildings. This requires the construction of multi-story buildings and infrastructure to ensure efficient use of the limited land area, construction on areas with significant elevation differences, or the construction of underground parking lots. Under such conditions, engineers increasingly have to solve construction problems in the conditions of compacted buildings, or in conditions of significant differences in the height of the building site.One of the most common engineering solutions to solve these problems is the implementation of massive retaining walls in the soil in the form of bored piles connected by a binding grid. The calculation of such structures requires special attention to the determination of the initial parameters of the considered problem and the choice of an approach to the calculation and analysis of the stress-strain state of the elements of the pit enclosure structures and the base.On the example, the calculation of the pile was performed in the engineering and geological conditions of the city of Kyiv with the same calculation parameters and different calculation methods. For the reliability of the comparison of loading results for all three cases, it was accepted according to DSTU NB V.2.1-31:2014. The obtained movements of the piles at the level of the bottom of the pit and the top of the pile were analyzed in three ways, and based on them, preliminary conclusions were formulated with prospects for further research.
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