Effect of shallow tunneling on neighboring structures

Hany El Naggar

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: INFRASTRUCTURE - IV Pipelines & Tunnels

ABSTRACT: Traffic worldwide is increasing at the same rate or even higher as the population growth. The need for placing transport infrastructure underground is growing in cities nowadays since above ground land is unavailable or very expensive especially in urban locations. Hence the interaction between newly constructed foundations and existing tunnels is unavoidable especially in the case of deep foundations. Thus it is an important to study the interaction between tunnels and piled foundations in details. This paper presents results obtained using a 3D finite element model to estimate the effect of a newly constructed tunnel on existing high rise building supported on piled foundations. The proposed 3D model used the newly develop shotcrete material model in Plaxis that was modified to model the reinforced concrete elements of the tunnel lining. Utilizing the developed FE model the characteristics of the soil-structure interaction were studied and the criteria for the safety of the structures were accordingly proposed.

RÉSUMÉ: Le trafic croit au même taux ou même plus que la population. La nécessité du transport souterrain se développe actuellement dans les villes, puisque la surface terraine est indisponible ou très chère, surtout en milieu urbain. e de l'interaction entre les tunnels et les pieux est un problème important. Cet article présente les résultats obtenus en utilisant un modèle d'éléments finis 3D pour estimer l'interaction un immeuble de grande hauteur et les tunnels. Le modèle 3D proposé a utilisé le nouveau modèle des matériaux de béton projeté développé dans Plaxis pour modéliser les éléments en béton armé du tunnel. Utilisant le modèle les caractéristiques de l'interaction sol-structure ont été étudiées et les critères pour la sécurité des structures ont été en conséquence proposés.

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