Abstract
The article considers study of influence of coefficient ksl on subsidence value. In course of study, it was revealed that coefficient ksl, determined according to normative documents of Russian Federation, has a limited scope and does not always lead to sufficiently satisfactory and theoretically justified results. In this article, a range of pressures on the bases up to 500 kPa has been investigated. This range makes it possible to take into account the redistribution of pressures in case of uneven deformations of the base of the foundations. These pressures in some areas can significantly exceed calculated resistance of subsidence soil. When pressure increases more than 500-600 kPa, subsidence decreases due to additional compaction of subsidence soil without soaking due to destruction of structural bonds from pressure value. Therefore, at high pressures on the base, proportion of subsidence deformations in the total vertical deformation decreases and the proportion of deformations caused by the development of shear zones increases. Dependence of thickness of lower subsidence zone on pressure by at different widths of bottom of a foundation are presented. Proposed algorithm for determining subsidence deformation by external load on base, allows to separate subsidence deformation from shear deformation of soil and thus obtain more accurate values of subsidence deformations in entire range of possible pressures on foundation Dependences of subsidence on pressure determined by normative documents and proposed algorithm for different foundation widths are given. A comparative analysis of values of subsidence at different foundation widths is given.
Highlights
Territories with subsident soils are widely distributed around the world and are found on almost all continents
Reliable determination of values of subsidence from external load and from own weight of soil is very important, because it depends on it choice of effective measures to protect buildings and structures from uneven deformations of base caused by subsidence of soil
In accordance with proposed algorithm and current normative documents [1, 2], dependences of subsidence on pressure were constructed for different widths of bottom of a foundation
Summary
Territories with subsident soils are widely distributed around the world and are found on almost all continents. The construction of buildings and structures on subsident soils, as a rule, requires additional protection measures against uneven deformations of base caused by the special properties of subsident soils, the thickness of which can reach up to 30 m [1, 2, 3]. Reliable determination of values of subsidence from external load and from own weight of soil is very important, because it depends on it choice of effective measures to protect buildings and structures from uneven deformations of base caused by subsidence of soil. When determining subsidence by this method, is used correction coefficient ksl, which has a defined area of correctly application and in some cases can lead to calculation results that differ significantly from real values
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