SUBSTANTIATION OF RELIABILITY OF DEVELOPED SPATIAL STATIC AND DYNAMIC MODELS OF NATURAL AND PILE FOUNDATIONS OF NPP STRUCTURES

摘要

Spatial static and dynamic models of natural and pile foundation were developed to take into account the effects of the interaction of structures foundation with soil environment under different operating conditions. The models allow developing and substantiating the optimized design for various purposes for structures foundation, taking into account the geological site conditions in the various operating modes including seismic excitations. The relevant stiffness and damping on the contact surface of the structure with foundation were introduced into the mechanical mathematical model to consider soil-structure interaction. Evaluation of internal forces for foundation slab sections is required for validation of the design. The distribution law for the stiffness of soil foundation was accepted. The foundation stiffness at an arbitrary nodal point of FEM is in proportional to stress arisen on soil on the contact surface. The comparison of the analysis of the NPP Reactor building and the results of the field studies demonstrated the validity of the reliability of the developed model of the natural foundation. The appropriateness of the use of pile foundations for increased stability and bearing capacity of NPP structures foundations was represented. The comparative analysis of the results of calculations with the data field for the Moscow Mercury City Tower building carried out for the demonstration of the suitability of 3-D model of pile foundation. Spatial static and dynamic models of natural and pile foundation were developed to take into account the effects of the interaction of structures foundation with soil environment and approved.