Abstract
The method of studying the stress-strain state of reinforcement structures of combined soil massifs has been proposed with the geometric and physical nonlinearity in the formulation of the problem based on the nonlinear theory of elasticity and plasticity of the soil. The study of the stress-deformed state of the computational domain from the standpoint of the mechanics of the deformed solid body had been carried out, using algorithms for solving the problems of the theory of elasticity and plasticity, with the construction of universal computational models of the combined half-space, that allows to determine more reasonably the magnitude of the stress-strain state of complex soil bases in interaction with the reinforcement structures, the surrounding buildings foundations and the whole complex of the surrounding buildings structures. The influence of new construction on the condition of soil bases and foundations of adjacent buildings had been evaluated by determining the change of pressure on the reinforcement structure and determining the stress-strain state change of this structure and the foundation of the existing house. The change in the deformation of the foundation of the existing building, ie the oscillation of the soil foundation and the maximum amplitude of uneven subsidence of the foundations of the existing building have been determined. Each formulation of the problem had to include its own reliability analysis and a specific approach that requires numerical modeling and development of appropriate measures to scientifically substantiate engineering preparation measures in dense building. Further design of protective reinforcement structures for new construction under the conditions of the building reconstruction has carried out considering the impact on the existing buildings and structures and the adjacent soil mass of different stages of construction, begining with the arrangement of protective reinforcement structures, the development of a excavation due to the effect of unloading the foundation, and the sequence of erection of engineering structures.
Highlights
In the process of reconstruction of urban territories by carrying out new construction in the conditions of dense construction, in particular, large-scale use of underground space in difficult engineeringgeological conditions, the activation of additional processes in the soil bases of territories and foundations of existing buildings and structures had been revealed
Tasks for the study of enclosure constructions should be solved with the simultaneous combination of such scientific directions as nonlinear theory of elasticity and plasticity, nonlinear soil mechanics, structural mechanics of combined structures, engineering geology, calculation of foundations and foundations of deep formation, studies of the behavior of structures of existing buildings and structures under changed conditions
Development of theoretical bases for the study of large elastic and elasticplastic deformations of a continuous medium, mathematical modeling of its joint work with structures of buildings and structures, the study of the tense state and the development of calculation methods, the influence of engineeringgeological conditions on the processes of reconstruction, issues of engineering and engineering a lot of work is devoted to the development of the theory of reliability, the application of any single theory or methodology does not allow to study all aspects of engineering ovky, the whole complex of factors influence the reconstruction of existing urban areas typically associated with the construction of new facilities, insufficiently studied soil deformation processes in the fundamentals surrounding dense housing structures in complex geological conditions
Summary
In the process of reconstruction of urban territories by carrying out new construction in the conditions of dense construction, in particular, large-scale use of underground space in difficult engineeringgeological conditions, the activation of additional processes in the soil bases of territories and foundations of existing buildings and structures had been revealed.
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