Числове моделювання спільної роботи елементів системи «грунтова основа — фундамент — будівля» в умовах будівництва на підроблюваних територіях

Abstract

UK: Наведено результати дослідження впливу підземних техногенних пустот на напружено–деформований стан елементів системи «ґрунтова основа — фундамент — будівля» шляхом числового моделювання.

EN: Problem definition. Under worked areas is the most common type of difficult conditions of construction in Ukraine. Construction on under worked areas is allowed if special structural measure sare applied to ensure the normal exploitation of buildings. Ignoring constructive protect ive measures cause damages that are estimated in the millions.

Purpose. The problem of influence of artificial cavities on the stress–strain state of building and its soil base is considered in this work. The purpose of the researching was the qualitative and quantitative estimation of the influence on the strain–stress state of the frame structures from the artificial cavities in the soil base, including the case of their possible destruction

Analysis of recent research. For last years, with the development of multistoried construction, the scientist sand designers of Odessa began to study seriously the building properties of limestone sand their bearing ability. Prediction of deformations and the tilts of the building’s foundations is possible at the stage of their design by numerical simulation. The problem of base–foundation–structure model development, which takes into account the influence of negative and positive factors on the stress–strain state of the system elements, remains actual.

Results. The numerical modeling results confirm the fact that the stress–strain state of the soil base and the frame of the building significantly react to the impact of each element of the system: it sown stiffness of the building, the components and the foundation stiffness, the characteristics of the soil base, the presence of the underground natural or artificial cavities, etc.

Conclusion. This approach makes it possible to appreciate the character of the building in teracti on with the having cavities soilbase: to assess the impact of the building load on the underground structures; to assess the impact from cavities on the stress–strain state of the load–bearing elements of structure. Analysis of numerical simulation results showed that projected deformation of ceiling arch of cavities on the static loads does not exceed 6 mm, which in the conditions of uniform soil settlements is not critical. According to the results of the research by using the numerical simulation we can state that the existing catacombs near the pit of the apartment complex are at satisfactory condition and almost will not impact on its pile foundations work.