METHOD OF SOLUTION OF THE PROBLEM OF CONSIDERATION OF THE STRAIN SOIL ANISOTROPY IN THE SOIL BASES CALCULATIONS

An improved method of the soil bases deformations calculation for consideration of strain anisotropy of the soil is presented in the article. Research has shown that the influence of strain anisotropy on the value of the predicted settlings with poorly expressed anisotropy of ordinary soils is estimated to reach 10-40% of the theoretical foundation settlement, located on the isotropic base. The obtained data can be used in the calculation of basis for distortions in the superstructure of buildings and structures, taking into account that for anisotropic soils the anisotropy index a<1 by the method of calculation of SP 22.13330.2011 "Foundations of buildings and structures" which ignores the anisotropy, leads to overstated values of settling and in such a ways of the foundations enhancements as the foundation base broadening, the clips arrangement, casings, build-ups, etc. For soils with the anisotropy index a> 1, the traditional calculation gives the decrease of the settling values. Considering that strain anisotropy impact is particularly high as these are usually soils with a layered or columnar texture, neglecting of this fact during the reconstruction is unacceptable.