Abstract
The paper focuses on determining foundation active zones and calculating foundation settlement which is the question of great scientific and practical interest. According to existing methodologies, researchers apply the theory of homogeneous isotropic linear-deformable medium to determine the deformation of soil foundations. In this study the authors propose to use the theory of soils compression seal and its one-dimensional problem solution to calculate the sediment of large base slabs. To justify this methodology, the authors specify the minimum size of foundation slabs. They analyze the Boussinesq's Formula and prove that compacting pressure is evenly distributed throughout the area of the slab bottom. The researchers delimit concepts of the active zone and the compressible strata. It is assumed that the compressible strata is a part of the active zone. The existing methods on calculating compressible strata capacity introduced by N.A. Tsytovich and K.E. Egorov (SP 22.13330.2016) are also analyzed in the paper. Besides, formulas of determining compressible strata capacity and of calculating slab foundation settlement are presented. Calculation results of this methodology and the method suggested in the existing code specification (CS) are produced and compared. The researches come to the conclusion that, according to CS, compressible strata capacity increases with the increase of foundation space under the same load. This corresponds to the theory of linear-deformable half-space. The authors believe that the size of slab foundation settlement depends only on the compacting pressure capacity (which coincides with the Winkler's hypothesis), and on the properties of foundation soils. The authors assign the application area of the spatial problem solution for calculating foundation settlement.
Highlights
The issues of the actual stress distribution under a foundation base were dealt with by N.A
According to the calculations of SP 22.13330.2016 [7] compressible strata capacity increases with the increase of foundation space under the same load
Compressible strata capacity depends on the compacting pressure capacity and the properties of foundation soils
Summary
To apply the one-dimensional problem of compressible strata it is to prove that base slabs function is subject to the following conditions: 1) The load on the soil surface has continuous distribution into all directions, i. e. this can be called “slab foundation”.2) The compacting pressure is evenly distributed on the area of a slab base. 3)Tthe power of the compressible strata is sufficient for the application of the problem solution. 4) The tension is evenly distributed on the compressible strata. To apply the one-dimensional problem of compressible strata it is to prove that base slabs function is subject to the following conditions: 1) The load on the soil surface has continuous distribution into all directions, i. 2) The compacting pressure is evenly distributed on the area of a slab base. To prove the first point we will refer to works of N.A. Tsytovich [5] who considered that the foundations with an area more than 50 sq.m belong to ‘slab foundations”. K.E. Egorov considers as slab ones only foundations of more than 10 m width [1, 4]. According to the SP 22.13330.2016 slab foundations are only those of more than 20 m width [6, 7]. For the proof of the second point we will give a formula of determination of contact pressure under a sole of a rigid stamp [4]: P0 2
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