抄録
Construction of the eye-glass-frame tunnels with a center pillar, which stand very close to each other, tends to increase because of limitation of the land utilization in Japan. Compare to the total number of the tunnels, there are not many constructions of the eye-glass-frame tunnels with a center pillar. In design and construction stage of this tunnel type; it is needed to understand sufficiently the characteristic such as displacement action of the periphery natural ground. This paper used measurement data for statistical analysis to study the influence on ground surface settlement during the construction stages.
