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Geotechnical and Geological Engineering

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24.01.2017 | Original paper

Application of Convergence–Confinement Method in Analysis of Shallow Non-circular Tunnels

verfasst von: M. Mousivand, M. Maleki, M. Nekooei, M. R. Mansoori

Erschienen in: Geotechnical and Geological Engineering | Ausgabe 3/2017

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Abstract

Stress reduction factor, λ, is a dimensionless coefficient in two-dimensional (2D) analysis based on convergence confinement method (CCM) of tunnel which represents stress relaxation in the tunnel walls at different excavation steps. The aim of this paper is to look into the influencing factors on parameter λ around the tunnel walls using finite difference code in order to improve the accuracy of the CCM. For this purpose, four different ground types with various tunnel radii, depths and cross section shapes are considered. Finally, the 2D analysis using uniform and variable stress reduction factors determined in this paper is compared with the 3D analysis of the tunnel. The results of this study enhance our understanding of the role of geometrical and soil material parameters of tunnel on stress relaxation around tunnel walls. The tunnel depth, soil type and tunnel shape have great influence on λ. Variable stress reduction factor enables the convergence–confinement method to predict the realistic behavior of third dimension of the tunnel and can also be used as the best alternative to 3D models.

Vorheriger Artikel Empirical Formula of Shear Strength of Rock Fractures Based on 3D Morphology Parameters

Nächster Artikel Hydrogeological Behaviour of Covers with Capillary Barrier Effects Made of Mining Materials

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Titel: Application of Convergence–Confinement Method in Analysis of Shallow Non-circular Tunnels
verfasst von: M. Mousivand
M. Maleki
M. Nekooei
M. R. Mansoori
Publikationsdatum: 24.01.2017
Verlag: Springer International Publishing
Erschienen in: Geotechnical and Geological Engineering / Ausgabe 3/2017
Print ISSN: 0960-3182
Elektronische ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-017-0173-4

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