Development of Influence zone of Water Supply Tunnel due to Nearby Deep Excavation
Keywords:
Influence zone, Water supply tunnels, Finite element, Parametric study, Deep excavationAbstract
A number of tunnels are being and have been constructed in the major cities due to the demand from an increasing population. Meanwhile, the increased need for building in congested urban areas often requires the basement floor. Deep excavation in close vicinity to the existing tunnels has a potential to worsen the stability or serviceability of the tunnel. The objective of this study is to develop the influence zone for tunnels due to the nearby deep excavation. Series of finite element parametric study on tunnel behavior induced by nearby deep excavation is carried out. Several factors affecting the tunnel response including tunnel diameter, excavation depth and relative distance are considered in the analyses. The results reveal that the excavation depth and relative distance have a significant impact on the movement and safety factor of the tunnels. Finally, based on the relationship between tunnel movement and safety factor, this study suggests the influence zone of tunnels due to the nearby deep excavation which may be useful for tunnel owner to establish a guideline for permission of nearby construction of basement floor of a building.
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