MATHEMATICAL MODELING OF THE INTERACTION OF FOUNDATIONS WITH WATER-SATURATED BASEMENTS BY ВEM

Abstract

Construction plays a major role in the development of all sectors of the country, in increasing labor productivity, and in raising the material well-being of the population. Studying, improving, and analyzing construction experience to ensure the successful construction of significant facilities requires the implementation of a large complex of scientific research, which will be a reliable basis for the development of effective foundation structures.

Strength is the problem of the century. Almost all materials, including soil, are destroyed as a result of the development of deformations of the form. The destruction of any solid body is the process of gradual disclosure, first of the weakest points, and then of fewer and fewer dangerous defects.

A characteristic and most striking feature of the soil is its predominantly plastic deformation almost from the moment of loading. The development of plastic (residual) deformations, which make up the majority of total deformations, causes a nonlinear dependence that requires consideration in geomechanics of this circumstance.

The article investigates the change in pile resistance depending on the geological parameters of their base, analyzes the capabilities of the proposed numerical approach (boundary element method, BEM) to nonlinear decision-making problems on the bearing capacity of piles in a fairly typical phenomenon of loess soil soaking. The action of water is one of the significant factors that affects the deformation of soil foundations.

According to experimental studies, in soaked loess soil, the angle of internal friction φ decreases by 1.5-2 times, the soil cohesion C decreases by 10 times, and Poisson’s ratio υ increases to 0.34-0.4. Even when loess soils have high strength and low deformation indicators in natural conditions, in the case of soaking their relative compressibility (from 3 to 5 cm) with a layer thickness of 10 m gives a settlement of 30-50 cm, which leads to tilting and the appearance of cracks in the structure.

There is an incompleteness of the calculation models in the regulatory documents for loess soils, therefore the problem of foundation construction of the transition from the bearing capacity of foundations in soils of natural humidity to the bearing capacity in waterlogged soils is relevant and for the present time and needs to be solved.