INTERACTION OF A COMPLEX OF BUILDINGS WITH SOIL BASE

Abstract

Subject: we consider formulation of the problem and the results of numerical studies of the change in the stress-strain state of the soil base resulting from construction of stadium structures. In terms of structures, the stadium includes four rectangular stands and office and administrative buildings, located in the corners of the stadium. The stands supported by reinforced concrete slabs of variable rigidity are separated from the foundation slabs of the office and administrative buildings by expansion joints. Research objectives: evaluation of influence of the stadium constructions on mutual deformation of their foundations and soil ground. Materials and methods: to assess the factor of mutual influence of buildings under construction, we have developed mathematical model of the system: “structures of the stadium - raft foundation - soil”. The loads transmitted from the structures erected on the foundation slabs and the stiffness of these structures were taken into account by including eight superelements into the analyzed model created in the ANSYS program for the upper structures of the stadium facilities. Soils located below the level of the designed foundations, down to dense limestone, were included into the geomechanical model. Only six geological elements are analyzed. The behavior of soils under loading is described by the elastoplastic soil model, the parameters of which are determined by the results of the triaxial tests. Since before the construction under the foundations of buildings, in a zone of distribution of soils with low values of deformation characteristics, measures were taken for improvement of their properties, in the current research two types of such activities were considered - replacement of weak soils or reinforcement by cementation. Results: the results of numerical studies showed that the complex nature of interaction of all structures of the stadium and non-uniform load distribution results in non-uniform settlement and bending of foundation plates of the stadium structures. Conclusions: distribution of vertical displacements of all slab foundations of office and administrative buildings is influenced by the stands erected nearby, and namely, the values of vertical displacements of the sides of the foundations adjacent to the stands are somewhat larger than those of the opposite side. At the same time, the vertical displacements of the foundations of office and administrative buildings affect, in turn, the nature of deformation of the slab foundations of less stiff structures of the stadium stands.

Keywords

• analysis
• stress-strain state
• soil base
• elastoplastic model
• interaction