Application of an advanced soil constitutive model to the study of railway vibrations in tunnels through 2D numerical models: a real case in Madrid (Spain)

Jesús Fernández Ruiz, Luis Medina Rodríguez

Abstract


In the last few years, different numerical models for the study of railway
vibrations in tunnels have been developed. Virtually all of them assume
an elastic and linear behaviour of the soil. In this article the influence
of soil constitutive model is investigated, comparing an “advanced”
model of the soil called Hardening Soil model with small-strain stiffness
(HSsmall) and the Mohr-Coulomb (MC) model. Moreover, the influence
of soil stiffness has been studied when this is considered in the range
of small strains (E50) or in the range of very small strains (E0). These
models have been applied to a real case through a 2D finite element
model formulated in the time domain, where it is concluded that both
soil stiffness and the amplitude of the maximum tangential strain are
the most important geotechnical parameters when estimating the
deformational parameters and the constitutive models of the soil most
adequate for the study of railway vibrations in tunnels.


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