Effects of geometrical conditions and construction procedures on the soil settlement and internal forces of twin-tunnels

Massoud Palassi, Mohammad Jaafari

In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost Conference

Session: W3-D

ABSTRACT: In this paper, the effects of relative position and depth of twin tunnels on the values of ground settlement and internal forces developed in the tunnel lining are investigated. Also, the effect of construction sequence is studied. Numerical models and analyses conducted for horizontally-aligned and vertically-aligned twin tunnels are presented. It is concluded that higher ground settlement and internal forces are developed for the vertically-aligned tunnels especially when the upper tunnel is constructed first.

RÉSUMÉ: En ce document, les effets de la position relative et la profondeur des tunnels jumeaux sur les valeurs du règlement au sol et des forces internes développés dans la doublure de tunnel sont étudiés. En outre, l'effet de l'ordre de construction est étudié. Des modèles numériques et les analyses conduits pour les tunnels jumeaux horizontal-alignés et vertical-alignés sont présentés. On le conclut que le règlement d'éminence et les forces internes sont développés pour les tunnels vertical-alignés particulièrement quand le tunnel supérieur est construit d'abord. 1 INTRUDUCTION

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