Assessment of interaction the new construction object at full load and the surrounding building in the dense urban development conditions

Abstract

The work is devoted to research the impact of a new building at full load after completion of its construction has been investigated through an assessment of the interaction with the building envelope, the ground mass of the base and the foundation of the existing five-story building, in comparison with the assessment of the impact of a deep excavation in the process of engineering preparation for this construction, based on the developed methodology for studying the interaction of new construction objects and nearby buildings in complex engineering and geological conditions and dense development conditions.
 For numerical studies of the stability of the combined space, the proposed methodology has been used, which is built on the initial relations of the variational equations of equilibrium and the equation of the load surface in the six-dimensional stress space, which is a development of the theory of the limit stress state of the soil half-space based on the introduction of an extended yield criterion for a plane problem of the nonlinear theory of elasticity and plasticity, which provides for the determination of the value of the second critical load, at which solid sections of the ultimate stress state appear in the soil half-space.
 From the analysis of the movements of the nodes located on the vertical face of the «wall in the soil» structure (retaining wall of the pit), it can be concluded that the transverse displacements of the retaining wall compared to the calculations according to the first option have changed to the opposite, which is associated with the formation of a sliding prism under the passive pressure on the retaining wall from the side of the pile foundation of the new building. This indicates a change in the stress-deformation state of the soil base of the existing building, from the influence of the deep excavation during the construction process, which was evaluated according to the first version of calculations, to the impact of the new building after the end of construction, which was analyzed according to the second version of calculations. In this way, the change in the stress-deformation state of the main urban building is determined, which is a criterion for determining the impact of adjacent construction in the urban area on the condition of the ground bases and foundations of adjacent buildings, their preservation and ensuring safe operation.