Study of the reliability and efficiency of using reinforced soil models within the framework of the finite element method
DOI:
https://doi.org/10.32347/2410-2547.2022.109.30-37Keywords:
finite element method, Coulomb-Mohr model, Hardening Soil model, young's modulus of soil, compressed depthAbstract
Within the framework of the finite element method, the influence of the dimensions of the calculation model on the values of subsidence when using different soil models was studied.
Numerical calculations of the soil environment based on FEM differ from analytical ones in that a necessary condition for their application is the choice of a soil model, which is characterized by a different theoretical basis, which, with the help of equations of different complexity and input parameters of a different number, describe the behaviour of the simulated soil massif.
Given that the numerical solution of problems based on FEM involves the modeling of objects as a finite limited area, the question of choosing the lower limit of the calculation model in the study of subsidence is acute.
The stiffness of soils in their natural state increases with the depth of their occurrence. In simple soil models, such as the Mohr-Coulomb model, soil stiffness is a constant value. This circumstance leads to the fact that during numerical calculations, the deformations of subsidence increase linearly when the dimensions of the calculation model increase vertically.
Advanced models, such as Hardening Soil, can take into account the soil strengthening when the stress level increases, however they require a wide range of soil characteristics, which are determined by experimental methods, using special equipment, and the determination of a number of parameters is not regulated by regulatory documents.
It is shown that the use of the reinforced soil model proposed by the authors, which, on the one hand, complies with state building regulations, and on the other hand, does not require the involvement of additional physical and mechanical characteristics of soils, allows obtaining more accurate values of the parameters of the stress-strain state of the foundation.
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