복층터널의 분기터널 굴착에 따른 기존터널의 안정성 분석

초록

Recently, underground road construction is attracting attention due to the groundtransportation facilities in the urban area have reached the saturation level and also theincrease in the traffic volume and the deepening of air pollution such as fine dust. Construction of underground roads is not only a reduce trafficjam in downtown butalso eco-friendly city design, so existing roads as well as new roads are becomingunderground. It is essential to construct divergence tunnels that serve as IC (interchage)and JC (Junction) when constructing underpasses. Therefore, the analysis of the effectof the existing tunnel by the divergence tunnel should be considered as essential. Inthis study, numerical analysis is performed to analyze the effect of existing tunnel onexcavation of divergence tunnel. The divergence tunnels were set in 5 cases at 45°intervals in the clockwise direction starting from the lower part of the existing tunnel. In each case, numerical analysis was carried out by using the DCM (DisplacementControlled Model) for applying the volume loss of 0.5%, 1.0% and 1.5%. As a result,it was found that, when the volume loss increased, the effect on displacement, fracturerange, and effect on stability increased as well. In addition, it was confirmed that thedivergence tunnel located directly underneath is weakest for the stability, and the casewhere the divergence tunnel is located diagonally rather than the vertical andhorizontal direction is found to be vulnerable to displacement and lining destruction.

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