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  5. Basement soil swelling and shrinkage accounting for fem system “basement – foundation – structure” under plane deformation condition

Basement soil swelling and shrinkage accounting for fem system “basement – foundation – structure” under plane deformation condition

I. Khrapatova, N. Koziura, A. Rachkovskyi
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Description: This work presents a calculation algorithm of structure on swelling soils base for the plane problem. In this work an analysis of the factors influencing the swelling of soils is made, the algorithm for calculating the structure with the base with swellable soils for a plane problem is given. At the same time, the swelling process is considered as an additional influence, close in nature to temperature, and the swelling soil is considered as a material having orthotropic properties. The value of the relative swelling depends on the level of the stress state, while the value of the main stresses is compared with the magnitude of the pressure of swelling. Therefore, to determine the deformation characteristics of the swelling soil, several variants of the stressed state of the soil have to be considered. The effectiveness of the obtained solution has been verified according to the example for plate foundations. Buildings and structures on bases with swelling soils are subject to uneven sediment, cracks and fractures. When designing, the effect of swelling on the entire “basement -foundation- structure“system is taken into account. Existing norms do not allow to create a working model and regulate the deformation calculation from external loads separately. The process of shrink-age of swelling soils and its and its consequences have been little studied. It is proposed to represent the soil massif in the form of a linearly deformable medium. The swelling of the base is taken into account as an additional influence. His influence is close in nature to temperature. A swelling primer is considered as a material with orthotropic properties. The technique of finding the characteristics of swelling soils for calculating the “basement -foundation- structure“ system was obtained. An algorithm for calculating the “basement -foundation- structure“ system on swelling soils is given, taking into account the orthotropic properties of these soils for a planar problem. The algorithm of accounting for swelling and shrinkage of swelling soils on the VAT system “bedding-foundation-building“ is developed.


Keywords: a swelling soils, shrinkage of swelling soils, ortotropical properties, final element method, system "basement – foundation – structure "

Reference:
 Khrapatova, Y.V., Koziura, N.A. and Rachkovskyi, A.V. (2018), “Uchet nabukhanyia y usadky hruntovoho osnovanyia na NDS systemы «osnovanye – fundament – sooruzhenye» v uslovyiakh ploskoi deformatsyy” [Basement soil swelling and shrinkage accounting for fem system “basement – foundation – structure” under plane deformation condition], Scientific Works of Kharkiv National Air Force University, Vol. 3(57), pp. 164-169. https://doi.org/10.30748/zhups.2018.57.25.