Atualmente, usar FEM como ferramenta na engenharia geotécnica é extremamente útil para a análise dos mecanismos de ruptura e fatores envolvidos. Por essa razão, usuário precisam entender a abordagem teórica a esse método.
Si bien los métodos convencionales han jugado un papel importante en el análisis geotécnico, a menudo se basan en suposiciones y brindan resultados conservadores. El análisis de elementos finitos es necesario para ciertos análisis.
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In order to obtain stresses and deformations in a geotechnical analysis, finite element analyses require stiffness parameters in addition to the traditional cohesion and friction angle strength parameters used in limit equilibrium safety analyses. The stiffness parameters depend on the constitutive model adopted for each material, but we can cite Young’s elastic modulus and Poisson ratio as examples for the case of the Mohr-Coulomb model.
While conventional methods have played an important role in geotechnical analysis, they are often based on assumptions and provide conservative results. Finite element analysis is required for certain analyses.
The construction of an embankment on clay can generate excess pore pressure in the clay, causing slope stability problems in the short term. For this reason, it’s important to evaluate the Factor of Safety while considering the clay behavior both drained (long term) and undrained (short term).
As water needs time to flow out from pores of soil with low permeability, we initially encounter an increase in pore water pressure, leading to a decrease of effective stresses and shear resistance. In geotechnical terminology we are dealing with undrained behaviour. What’s the consequence? The safety of the embankment is at risk.
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