Abstract
abstract: The study of shallow tunnels introduces different aspects when compared to deep tunnels analysis. Among these characteristics can be emphasized the non-uniform shape of the deformed cross-section and the impossibility of some simplifications such as the consideration of homogeneous stresses around the excavation. Since the tunnel lining is subject to combined bending and compression, shallow tunnels are more susceptible to the development of final tensile stresses (not founded in deep tunnels) and the consequent concrete cracking. This paper presents a numerical simulation in finite elements with the ANSYS software. The purpose of the study is to analyze the cracking influence in the displacements of shallow tunnels, treating the concrete behavior by three different models: elastic, viscoelastic and viscoelastic with cracking effects.
Highlights
The strains resulting from an excavation process reduce the existing stresses in the soil mass and induce forces in the lining that correspond to a part of this initial geostatic pressures [1], [2]
This paper presents a finite element model elaborated with ANSYS software
The present research deals with the structural behavior of the reinforced concrete lining of shallow tunnels, with emphasis on the cracking analysis and the impact obtained on the displacement results when considering its effects
Summary
The strains resulting from an excavation process reduce the existing stresses in the soil mass and induce forces in the lining that correspond to a part of this initial geostatic pressures [1], [2]. The design of underground facilities requires the correct evaluation of both the soil mass deformations and the lining stress levels.
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