Abstract
Quasi-3-dimensional seepage of groundwater was analyzed using the finite element method, to investigate the behavior of groundwater level in and around a tunnel during excavation utilizing the dewatering method. The simulated results agree well with the observed patterns of the groundwater distribution. In addition, effectiveness of water level control by distributed well points was analyzed using an unsteady 2-dimensional saturated-unsaturated model applied to the vertical plane across the tunnel cutting face. The results indicated that, by installing well points as excavation proceeds, the water content and, thus, the stability of the cutting surface can be effectively controlled.
