Features of the numerical simulation in research on the stress strain behavior of underground structures

Abstract

In our time, widely use numerical calculations methods, the leading place among which is the finite element method (FEM).The necessity of using numerical methods in calculating underground structures is caused by complexity and the inability to perform analytical calculation because of such factors: сomposite build configuration, structural diagram of constructions, anisotropy of materials, differential subsidence, multistage construction, etc.The article considers the most common questions, which arise at the stage of discrete modelling for calculation of the stress strain behavior of system "underground development - a soil mass" by use of FEM, such as:Measuring and pattern of distribution dead loads from soil mass. At great depth underground pressure generally does not depend on depth of construction, that give a problem.Choosing a material model. The credibility of research results depends on selected mathematical model of the soil. Simple models give blunder and complex models require more conditions that need to be determined qualitatively using special purpose equipment. Choosing FE-mesh dimensions. Differing approaches to problem solving impact differently on the distribution of stress strain behavior in constructions and the soil mass.Also, the article deals questions of dimensioning mesh coarseness, selecting boundary conditions, the setting of interfaces, etc.Problem solution requires a thorough understanding of the mathematical methods and the physical phenomena that are modelled, taking into account the diversity of natural and production factors.