Supply facilities have to be buried due to urban development from rapid
population growth and a lack of land; therefore, vertical shaft construction has
increased for utility tunnels. Because utility tunnels are installed in urban areas, there
can be critical problems from faulty construction. Conventional construction methods
used in most vertical shafts cause a decrease in the groundwater level which is one
reason for ground settlement. Therefore, construction methods have been researched
that take into consideration the ground settlement of vertical shafts, and the ring cut
method was developed. This method first penetrates an outer section of the shaft to
prevent soil inflow and extends the seepage line. Using this method, ground settlement
caused by construction is expected to decrease. This study performed 2-dimensional
stress-seepage coupled numerical feasibility tests to analyze the effective penetration
depth of the ring cut method. Settlement and seepage were measured to evaluate its
performance. The obtained data will be used to optimize the newly developed method.