The stability of tunnel face in the sandy ground is influenced not only by the mechanical properties of the ground but also by groundwater conditions. Numerical parametric analyses are carried out by the three-dimensional mechanical-groundwater flow coupling analysis method to evaluate the parameter that effects the face stability of tunnels that combine the physical property values of sandy ground with the groundwater head. The results of the analyses indicate that the face stability remains unchanged when the relative density of the ground is 80% or over, or the initial groundwater head is less than 10m from the tunnel center.

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